Method, device, equipment and storage medium for determining oil and gas reservoir exploration position

Abstract

The present disclosure provides a method, device, equipment and storage medium for determining the exploration position of oil and gas reservoirs, and belongs to the field of oil and gas exploration and development. The determination method includes: based on the oil and gas accumulation period of the slope zone, determining the direction of oil and gas migration in the slope zone, determining the dominant sand body layer in the sandstone reservoir of the slope zone, the dominant sand body layer is the sandstone reservoir in the pre-exploration well with an oil and gas production volume higher than the average production volume, and the sandstone reservoir thickness of the dominant sand body layer is higher than the average sandstone thickness, the average production volume is the average production volume of the multiple pre-exploration wells, and the average sandstone thickness is the average sandstone reservoir thickness of the multiple pre-exploration wells; based on the direction of oil and gas migration and the dominant sand body layer, determining the exploration position of the non-structural oil and gas reservoir in the slope zone. The present disclosure can accurately determine the non-structural oil and gas reservoirs in the slope zone through this method, thereby increasing oil and gas production.

Description

Technical Field

[0001] The present invention relates to the field of oil and gas exploration and development, and in particular to a method, device, equipment and storage medium for determining the exploration position of an oil and gas reservoir. Background Art

[0002] The slope zone is the main directional area for the long-term migration and accumulation of oil and gas in the basin, and the oil and gas enrichment in the slope zone is high. The existence of the slope zone is a favorable condition for the formation of structural oil and gas reservoirs, and it is also a favorable condition for the formation of non-structural oil and gas reservoirs (lithological oil and gas reservoirs). The so-called structural oil and gas reservoirs are formed due to geological tectonic movements. Non-structural oil and gas reservoirs are formed due to changes in the lithology or physical properties of the formation (reservoir). With the continuous advancement of exploration technology, most of the structural oil and gas reservoirs have been exploited, so in order to increase production, it is necessary to find non-structural oil and gas reservoirs.

[0003] In the related technology, when searching for non-structural oil and gas reservoirs in a slope belt, the slope belt is first explored by seismic technology to obtain a corresponding seismic profile morphology map, and the corresponding groove position, slope break position and far shore position are found according to the seismic profile morphology map. Then, combined with the logging data, the slope belt is divided into a slope high part, a slope middle part, a slope low part, etc. according to the depth. Finally, the groove position in the slope high part, the slope break position in the slope low part and the far shore position in the slope low part are used as the exploration positions of non-structural oil and gas reservoirs in the slope belt.

[0004] However, since the above methods are based on the overall shape of the slope belt when defining the groove position, slope break position and far shore position, the above methods cannot accurately determine the exploration position of the oil and gas reservoir, which may provide erroneous guidance for subsequent development drilling. Summary of the invention

[0005] The embodiments of the present disclosure provide a method, device, equipment and storage medium for determining the exploration position of an oil and gas reservoir, which can accurately determine the exploration position of an oil and gas reservoir in an inclined belt. The technical solution is as follows:

[0006] The embodiments of the present disclosure provide a method, device, equipment and storage medium for determining a reservoir exploration position of an oil and gas reservoir. The determination method includes:

[0007] For determining the exploration position of non-structural oil and gas reservoirs in a slope zone, the determination method comprises:

[0008] Determine the direction of oil and gas migration in the slope belt based on the oil and gas accumulation period of the slope belt, wherein the oil and gas accumulation period is the geological history period when the slope belt accumulates to form oil and gas reservoirs;

[0009] Determine a dominant sand body layer in the sandstone reservoir of the slope zone, wherein the slope zone is provided with a plurality of pre-exploration wells, the dominant sand body layer is a sandstone reservoir in a pre-exploration well in which the oil and gas production volume is higher than the average production volume, and the sandstone reservoir thickness of the dominant sand body layer is higher than the average sandstone thickness, the average production volume is the average production volume of the plurality of pre-exploration wells, and the average sandstone thickness is the average sandstone reservoir thickness of the plurality of pre-exploration wells;

[0010] Based on the direction of oil and gas migration and the dominant sand body layer, the exploration position of the non-structural oil and gas reservoir in the slope zone is determined.

[0011] In another implementation of the present disclosure, determining the direction of oil and gas migration in the slope zone based on the oil and gas accumulation period of the slope zone includes:

[0012] Determining the oil and gas migration layer in the slope zone, wherein the oil and gas migration layer is a sandstone reservoir containing oil and gas;

[0013] Constructing a top surface structural map of the oil and gas migration layer during the oil and gas accumulation period;

[0014] Based on the logging data of the exploration wells, the oil and gas migration channel index corresponding to each exploration well is calculated, and the oil and gas migration channel index is used to indicate the migration capacity of the channel for oil and gas migration in the sandstone reservoir of the corresponding exploration well;

[0015] Based on the top surface structural map and the oil and gas migration channel index, the direction of the oil and gas migration is determined.

[0016] In yet another implementation of the present disclosure, the logging data includes: the thickness of the oil-bearing sandstone reservoir in the well, the thickness of the oil-soaked sandstone reservoir in the well, the thickness of the oil-spotted sandstone reservoir in the well, the thickness of the oil-stained sandstone reservoir in the well, the thickness of the oil-stained sandstone reservoir in the well, the thickness of the fluorescent sandstone reservoir in the well, and the thickness of the sandstone reservoir in the well;

[0017] The step of calculating the oil and gas migration channel index corresponding to each of the exploration wells based on the logging data of the exploration wells includes:

[0018] The oil and gas migration channel index is calculated by the following formula:

[0019]

[0020] Wherein, HMIe is the oil and gas migration channel index, dimensionless; h 含油 is the thickness of the oil-bearing sandstone reservoir, in m; h 油浸 is the thickness of the oil-immersed sandstone reservoir, in m; h 油斑 is the sandstone reservoir thickness of the oil patch, in m; h 油迹is the thickness of the sandstone reservoir of the oil trace, in m; h 荧光 is the thickness of the fluorescent sandstone reservoir, in m; H is the thickness of the sandstone reservoir, in m.

[0021] In another implementation of the present disclosure, the determining of the dominant sand body layer in the sandstone reservoir of the slope zone includes:

[0022] Based on the logging data of the statistical well, different reservoir categories of the slope zone are obtained, wherein the statistical well is a pre-exploration well having a sandstone reservoir with a thickness greater than an average sandstone thickness;

[0023] Based on the reservoir category, the dominant sand body layer in the slope zone is determined.

[0024] In yet another implementation of the present disclosure, the logging data includes: the thickness of the oil-bearing sandstone reservoir in the well, the thickness of the oil-soaked sandstone reservoir in the well, the thickness of the oil-spotted sandstone reservoir in the well, the thickness of the oil-stained sandstone reservoir in the well, the thickness of the oil-stained sandstone reservoir in the well, the thickness of the fluorescent sandstone reservoir in the well, and the thickness of the sandstone reservoir in the well;

[0025] The reservoir categories include: the first reservoir category, the second reservoir category, the third reservoir category, the fourth reservoir category and the fifth reservoir category;

[0026] The first reservoir category is the sandstone reservoir corresponding to the pre-exploration well, in which the thickness of the oil-bearing sandstone reservoir is greater than 0;

[0027] The second reservoir category is the sandstone reservoir corresponding to the pre-exploration well, in which the thickness of the oil-bearing sandstone reservoir is equal to 0 and the thickness of the oil-immersed sandstone reservoir is greater than 0;

[0028] The third reservoir category is the sandstone reservoir corresponding to the pre-exploration well, in which the thickness of the oil-bearing sandstone reservoir and the thickness of the oil-immersed sandstone reservoir are both equal to 0, and the thickness of the oil-spotted sandstone reservoir is greater than 0;

[0029] The fourth reservoir category is the sandstone reservoir corresponding to the pre-exploration well, in which the thickness of the oil-bearing sandstone reservoir, the thickness of the oil-immersed sandstone reservoir and the thickness of the oil-spotted sandstone reservoir are respectively equal to 0, and the thickness of the oil-stain sandstone reservoir is greater than 0;

[0030] The fifth reservoir category is the sandstone reservoir corresponding to the pre-exploration well, in which the thickness of the oil-containing sandstone reservoir, the thickness of the oil-immersed sandstone reservoir, the thickness of the oil-spotted sandstone reservoir and the thickness of the oil-trace sandstone reservoir are respectively equal to 0, and the thickness of the fluorescent sandstone reservoir is greater than 0.

[0031] In another implementation of the present disclosure, the step of determining the exploration position of the oil and gas reservoir in the slope zone based on the direction of oil and gas migration and the dominant sand body layer includes:

[0032] Drawing a sandstone equal thickness map according to the thickness of the sandstone reservoirs in the plurality of pre-exploration wells;

[0033] superimposing the direction of oil and gas migration on the sandstone isopach map;

[0034] On the sandstone isopach map, the position corresponding to the dominant sand body layer in the direction of oil and gas migration is used as the exploration position.

[0035] In another implementation of the present disclosure, before determining the direction of oil and gas migration in the slope zone based on the oil and gas accumulation period of the slope zone, the determination method further includes:

[0036] Acquire a plurality of sandstone reservoir samples from each of the plurality of sampling wells, wherein the plurality of sampling wells are part of the plurality of pre-exploration wells;

[0037] Conducting fluid inclusion homogenization temperature measurement on the plurality of sandstone reservoir samples respectively to obtain corresponding plurality of temperature data;

[0038] Constructing a single well burial history of each of the sampling wells, wherein the single well burial history is a graph showing changes in the uplift or subsidence of the strata in the corresponding sampling well over time;

[0039] The oil and gas accumulation period is determined based on the temperature data and the burial history of the single well.

[0040] In another implementation of the present disclosure, an embodiment of the present disclosure provides a device for determining an exploration position of an oil and gas reservoir, the device comprising:

[0041] The oil and gas migration direction determination module is used to determine the direction of oil and gas migration in the slope belt based on the oil and gas accumulation period of the slope belt, and the oil and gas accumulation period is the geological history period when the slope belt accumulates to form oil and gas reservoirs;

[0042] A dominant sand body layer determination module is used to determine a dominant sand body layer in a sandstone reservoir of the slope zone, wherein the slope zone is provided with a plurality of pre-exploration wells, wherein the dominant sand body layer is a sandstone reservoir corresponding to an oil and gas production volume of the pre-exploration wells being higher than an average production volume, and wherein the sandstone storage thickness of the dominant sand body layer is higher than an average sandstone thickness, wherein the average production volume is an average production volume of the plurality of pre-exploration wells, and the average sandstone thickness is an average sandstone storage thickness of the plurality of pre-exploration wells;

[0043] The exploration position determination module is used to determine the exploration position of the non-structural oil and gas reservoir in the slope zone based on the direction of oil and gas migration and the dominant sand body layer.

[0044] In another implementation of the present disclosure, an embodiment of the present disclosure further provides a computer device, which includes a processor and a memory configured to store executable instructions of the processor; the processor is configured to execute the aforementioned method for determining the exploration location of an oil and gas reservoir.

[0045] In yet another implementation of the present disclosure, an embodiment of the present disclosure further provides a computer storage medium on which computer instructions are stored, and when the computer instructions are executed by a processor, the aforementioned method for determining the exploration position of an oil and gas reservoir is implemented.

[0046] The technical solution provided by the embodiments of the present disclosure has the following beneficial effects:

[0047] By using the determination method provided by the embodiment of the present disclosure, when determining the exploration position of the non-structural oil and gas reservoir in the slope zone, since the determination method first determines the direction of oil and gas migration in the slope zone, and then determines the dominant sand body layer in the sandstone reservoir in the slope zone based on the oil and gas production of the pre-exploration wells and the thickness of the sandstone in the slope zone, and then determines the exploration position of the non-structural oil and gas reservoir according to the direction of oil and gas migration and the dominant sand body layer, it is possible to combine the actual situation of the sandstone reservoir in the slope zone and the migration direction of oil and gas to more accurately determine the exploration position of the oil and gas reservoir, thereby avoiding blindly determining the exploration position of the non-structural oil and gas reservoir in the slope zone based on the overall shape of the slope zone. BRIEF DESCRIPTION OF THE DRAWINGS

[0048] In order to more clearly illustrate the technical solutions in the embodiments of the present disclosure, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present disclosure. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0049] Figure 1 It is a flow chart of a method for determining the exploration position of an oil and gas reservoir provided by an embodiment of the present disclosure;

[0050] Figure 2 is a flow chart of another method for determining the exploration position of an oil and gas reservoir provided by an embodiment of the present disclosure;

[0051] Figure 3 This is a schematic diagram of the single-well burial history and fluid inclusion homogenization temperature projection of sampling well Gs39;

[0052] Figure 4This is a schematic diagram of the single well burial history and fluid inclusion homogenization temperature projection of sampling well F21;

[0053] Figure 5 This is a schematic diagram of the single-well burial history and fluid inclusion homogenization temperature projection of sampling well K60;

[0054] Figure 6 It is the superposition map of migration channel index and structural contour lines of the third section of the slope belt sand;

[0055] Figure 7 This is the sandstone thickness map of the third section of the slope belt sand;

[0056] Figure 8 It is a superimposed diagram of the direction of oil and gas migration on the sandstone isopach map;

[0057] Fig. 9 It is a structural schematic diagram of a device for determining the exploration position of an oil and gas reservoir provided by an embodiment of the present disclosure;

[0058] Fig.10 It is a structural diagram of a computer device provided in an embodiment of the present disclosure. DETAILED DESCRIPTION

[0059] In order to make the objectives, technical solutions and advantages of the present disclosure more clear, the embodiments of the present disclosure will be further described in detail below with reference to the accompanying drawings.

[0060] The embodiment of the present disclosure provides a method for determining the exploration position of an oil and gas reservoir, which is used to determine the exploration position of a non-structural oil and gas reservoir in a slope zone. Figure 1 As shown, the determination method includes:

[0061] S101: Determine the direction of oil and gas migration in the slope belt based on the oil and gas accumulation period of the slope belt. The oil and gas accumulation period is the geological history period when the slope belt accumulates and forms oil and gas reservoirs.

[0062] S102: Determine the dominant sand body layer in the sandstone reservoir of the slope zone, where multiple exploration wells are provided in the slope zone, and the dominant sand body layer is the sandstone reservoir in the exploration wells whose oil and gas production is higher than the average production volume, and the sandstone reservoir thickness of the dominant sand body layer is higher than the average sandstone thickness, the average production volume is the average production volume of multiple exploration wells, and the average sandstone thickness is the average sandstone reservoir thickness of multiple exploration wells.

[0063] S103: Determine the exploration location of non-structural oil and gas reservoirs in the slope zone based on the direction of oil and gas migration and the dominant sand body layers.

[0064] By using the determination method provided by the embodiment of the present disclosure, when determining the exploration position of the non-structural oil and gas reservoir in the slope zone, the direction of oil and gas migration in the slope zone is determined, and the dominant sand body layer in the sandstone reservoir in the slope zone is determined based on the oil and gas production of the pre-exploration wells and the thickness of the sandstone in the slope zone. The exploration position of the non-structural oil and gas reservoir is determined based on the direction of oil and gas migration and the dominant sand body layer. Therefore, the actual situation of the sandstone reservoir in the slope zone and the migration direction of oil and gas can be combined to more accurately determine the exploration position of the oil and gas reservoir, thereby avoiding blindly determining the exploration position of the non-structural oil and gas reservoir in the slope zone based on the overall shape of the slope zone.

[0065] Figure 2 is a flowchart of another method for determining the exploration position of an oil and gas reservoir provided by an embodiment of the present disclosure, combined with Figure 2 , the determination methods include:

[0066] S201: Acquire a plurality of sandstone reservoir samples from each of a plurality of sampling wells, where the plurality of sampling wells are some of the plurality of pre-exploration wells.

[0067] In this embodiment, when selecting sampling wells, several representative exploration wells are selected, that is, these multiple sampling wells are combined together to cover the main characteristics of the slope zone. The characteristics here can be: there are many oil-bearing layers in the exploration wells, the oil and gas production is high, and the well depth reaches the depth corresponding to the oil and gas reservoir.

[0068] When obtaining sandstone reservoir samples from a sampling well, the logging data is first combined to determine the stratigraphic location of the sandstone reservoir (i.e., the oil and gas-bearing layer) of the sampling well, and then a plurality of sandstone reservoir samples are obtained from the stratigraphic location using a coring tool.

[0069] S202: Perform fluid inclusion homogenization temperature measurement on a plurality of sandstone reservoir samples respectively to obtain a plurality of corresponding temperature data.

[0070] During the mineral formation process, due to the influence of various factors, various defects are produced in the minerals being formed (or after formation). The medium is trapped in these defects by the minerals and retained and preserved, and what is retained in the defects is the fluid inclusion.

[0071] Homogenization temperature refers to the situation where a two-phase or multi-phase fluid inclusion at room temperature is transformed into a uniform single-phase fluid after uniform heating. The corresponding temperature at this time is the homogenization temperature.

[0072] Exemplarily, the homogenization temperature of fluid inclusions is determined in the following manner: a sandstone reservoir sample is made into an inclusion slice; the inclusion slice is placed on a microscope stage, and the inclusions are observed through a microscope; the inclusion slice is placed in a hot and cold stage, and the temperature of the hot and cold stages is adjusted until the bubbles in the inclusions under the microscope suddenly disappear, and the corresponding temperature at this time is the corresponding temperature data.

[0073] By measuring the homogenization temperature of fluid inclusions in sandstone reservoir samples, multiple temperature data can be obtained, which will lay a foundation for the subsequent determination of the oil and gas accumulation period.

[0074] S203: constructing a single well burial history of each sampling well, where the single well burial history is a graph showing changes in the uplift or subsidence of the strata in the corresponding sampling well over time.

[0075] Exemplarily, step S203 includes:

[0076] (1) Use modeling software to construct the single-well burial history of each sampling well.

[0077] Exemplarily, the modeling software may be PetrelMOD software.

[0078] When constructing the single-well burial history of each sampling well, the stratification and thickness of the strata are obtained through the existing logging data (such as stratum thickness, degree of stratum erosion, ancient water depth, etc.); using PetrelMOD software, combined with the stratification and thickness of the strata, the single-well burial history of each sampling well can be constructed.

[0079] (2) The burial history of each well was corrected using vitrinite reflectance.

[0080] Vitrinite is a coal substance, mainly composed of aromatic condensed ring compounds. The reflectivity of vitrinite refers to the reflectivity of the vitrinite surface.

[0081] The actual vitrinite reflectance in the slope zone is obtained by testing sandstone reservoir samples. The measured vitrinite reflectance is then compared with the vitrinite reflectance in the single well burial history simulated by the software PetrelMOD. If the difference between the simulated vitrinite reflectance and the measured vitrinite reflectance exceeds 5%, the established model in PetrelMOD is corrected, that is, the single well burial history is corrected until the difference between the simulated vitrinite reflectance and the measured vitrinite reflectance is within 5%.

[0082] The above correction method is only one of the methods to correct the burial history of a single well.

[0083] S204: Determine the oil and gas accumulation period based on temperature data and single well burial history.

[0084] By projecting the measured homogenization temperature data of fluid inclusions onto the burial history of a single well, the geological history period of oil and gas accumulation, that is, the oil and gas accumulation period, can be determined.

[0085] The burial history of a single well contains the temperature changes experienced by each stratum during the burial process (see Figure 3-5 ), projecting the measured homogenized temperature data of inclusions onto the temperature line of the stratum corresponding to the fluid inclusions, the corresponding oil and gas accumulation period can be obtained.

[0086] Figure 3 This is a schematic diagram of the burial history recovery and fluid inclusion homogenization temperature projection of sampling well Gs39. Figure 3 In the figure, the horizontal axis represents time and the vertical axis represents the depth of the formation. Figure 3 As shown, the sampling well Gs39 includes multiple strata, namely Q, Nm, Ng, Ed, Es1, Es2, and Es3 (the area enclosed by the horizontal line at the top of the figure and the oblique line on the right is a corresponding stratum). Each stratum has multiple temperature lines. The multiple overlapping and horizontally extending lines in the figure are the temperature lines of each stratum, and the corresponding left side is marked with temperature.

[0087] Since the stratum corresponding to the sandstone reservoir in the sampling well is Es1, the stratum corresponding to the fluid inclusions during sampling is also Es1.

[0088] The homogenization temperature of the fluid inclusions in the formation was measured, and the following results were obtained: Figure 3 The bar graph in the lower left corner. There are two peaks in the bar graph, corresponding to temperatures of 85 and 125°C. The above two temperatures are matched to the temperature line of the stratum (Es1), and two corresponding areas are obtained. The horizontal axis of the area corresponds to two ages. The left side is 85°C, and the corresponding age is Ed (Dongying Formation deposition period), and the right side is 125°C, and the corresponding age is Nm (Minghuazhen Formation deposition period).

[0089] Since the more inclusions corresponding to 125℃, the greater the oil and gas charging intensity, it can be considered that the oil and gas accumulation corresponding to this temperature is the most important oil and gas accumulation period, that is, the oil and gas accumulation period in the sampling well corresponds to the deposition period of the Minghuazhen Formation.

[0090] Figure 4 This is a schematic diagram of the single well burial history and fluid inclusion homogenization temperature projection of sampling well F21. Figure 5 This is a schematic diagram of the single well burial history and fluid inclusion homogenization temperature projection of sampling well K60. Figure 4 and Figure 5 , we can see that the corresponding oil and gas accumulation period in sampling wells F21 and K60 is the deposition period of the Minghuazhen Formation.

[0091] In this embodiment, the single well burial history and fluid inclusion homogenization temperature projection schematic diagrams corresponding to other sampling wells are not listed one by one.

[0092] According to the single well burial history and fluid inclusion homogenization temperature projection diagram of each sampling well, it can be known that the corresponding oil and gas accumulation period is the deposition period of Minghuazhen Formation. That is, the corresponding oil and gas accumulation period in this slope belt is the deposition period of Minghuazhen Formation.

[0093] S205: Determine the direction of oil and gas migration in the slope zone based on the oil and gas accumulation period in the slope zone.

[0094] Step S205 includes:

[0095] The first step is to determine the oil and gas migration layer in the slope zone. The oil and gas migration layer is the sandstone reservoir containing oil and gas in the slope zone.

[0096] The oil and gas migration layer is determined by referring to the stratigraphic position corresponding to the sandstone reservoir sample. When the stratigraphic position corresponding to the sandstone reservoir sample is Es1, the oil and gas migration layer is also Es1.

[0097] The second step is to construct the top surface structural map of the oil and gas migration layer during the oil and gas accumulation period.

[0098] The top surface structural map, also known as the top surface structural contour map, refers to a structural map that uses contour lines to reflect the undulating shape of the top surface of a certain sandstone reservoir.

[0099] Exemplarily, a top surface structural map of the oil and gas migration layer is constructed using three-dimensional seismic interpretation technology.

[0100] In this embodiment, it is necessary to determine the structural ridge on the drawn top surface structural map in order to prepare for the subsequent determination of the direction of oil and gas migration.

[0101] Among them, the structural ridge refers to the ridge line of the positive structure formed due to the change in the occurrence of sandstone reservoirs.

[0102] The third step is to calculate the oil and gas migration channel index corresponding to each exploration well based on the logging data of the exploration well. The oil and gas migration channel index is used to indicate the migration capacity of the channel for oil and gas migration in the sandstone reservoir of the corresponding exploration well.

[0103] In this embodiment, the logging data includes: the thickness of the oil-bearing sandstone reservoir in the pre-exploration well, the thickness of the oil-immersed sandstone reservoir, the thickness of the oil-spotted sandstone reservoir, the thickness of the oil-trace sandstone reservoir, the thickness of the fluorescent sandstone reservoir, and the thickness of the sandstone reservoir in the pre-exploration well.

[0104] The oil and gas migration channel index is calculated by the following formula:

[0105]

[0106] Wherein, HMIe is the oil and gas migration pathway index, dimensionless; h 含油 is the thickness of the oil-bearing sandstone reservoir, in m; h 油浸 is the thickness of the oil-immersed sandstone reservoir, in m; h 油斑 is the sandstone reservoir thickness of the oil spot, in m; h 油迹 is the thickness of the sandstone reservoir with oil traces, in m; h 荧光 is the thickness of the fluorescent sandstone reservoir, in m; H is the thickness of the sandstone reservoir, in m.

[0107] The thickness of a sandstone reservoir refers to the total thickness of the sandstone reservoir.

[0108] The fourth step is to determine the direction of oil and gas migration based on the top surface structural map and oil and gas migration channel index.

[0109] For example, when determining the direction of oil and gas migration, the position of the structural ridge is first determined on the top surface structural map, and then at the position of the structural ridge, the direction of the oil and gas migration channel index from small to large is the direction of oil and gas migration.

[0110] like Figure 6 As shown in the figure, in the top surface structural map, the position where the structural contour line bulges outward is the position of the corresponding structural ridge, for example, positions A, B, C, etc. in the figure. Then, at this position, according to the size of the oil and gas migration channel index corresponding to the sandstone reservoir in the pre-exploration well, the direction of oil and gas migration can be obtained by pointing from small to large.

[0111] S206: Determine the dominant sand body layer in the sandstone reservoir of the slope zone.

[0112] Step S206 includes:

[0113] In the first step, different reservoir categories of the slope zone are obtained based on the logging data of the statistical wells, where the statistical wells are exploration wells with sandstone reservoirs with a thickness greater than the average sandstone thickness.

[0114] Exemplarily, the above steps are implemented in the following manner:

[0115] (1) Count the thickness of sandstone reservoirs in all exploration wells in the slope zone and draw sandstone equal thickness maps;

[0116] (2) The exploration wells whose sandstone reservoir thickness in the sandstone isopyctic map is greater than the average sandstone thickness are regarded as statistical wells.

[0117] In this embodiment, the sandstone reservoirs in the slope zone are classified according to the following standards:

[0118] The reservoir categories include the first reservoir category, the second reservoir category, the third reservoir category, the fourth reservoir category and the fifth reservoir category.

[0119] The first reservoir category is the sandstone reservoirs corresponding to the pre-exploration wells, where the thickness of the oil-bearing sandstone reservoirs is greater than 0;

[0120] The second reservoir category is the sandstone reservoir corresponding to the pre-exploration well, in which the thickness of the oil-bearing sandstone reservoir is equal to 0 and the thickness of the oil-immersed sandstone reservoir is greater than 0;

[0121] The third reservoir category is the sandstone reservoir corresponding to the pre-exploration well, in which the thickness of the oil-bearing sandstone reservoir and the thickness of the oil-immersed sandstone reservoir are both equal to 0, and the thickness of the oil-spotted sandstone reservoir is greater than 0;

[0122] The fourth reservoir category is the sandstone reservoir corresponding to the pre-exploration well, in which the thickness of the oil-bearing sandstone reservoir, the thickness of the oil-immersed sandstone reservoir and the thickness of the oil-spotted sandstone reservoir are respectively equal to 0, and the thickness of the oil-stained sandstone reservoir is greater than 0;

[0123] The fifth reservoir category is the sandstone reservoir corresponding to the exploration well, in which the thickness of the oil-bearing sandstone reservoir, the oil-immersed sandstone reservoir, the oil-spotted sandstone reservoir and the oil-trace sandstone reservoir are respectively equal to 0, and the thickness of the fluorescent sandstone reservoir is greater than 0.

[0124] The second step is to identify the dominant sand body layers in the slope zone based on the reservoir type.

[0125] In the above implementation, the sandstone reservoirs belonging to the first reservoir category and the second reservoir category are regarded as the dominant sand body layers.

[0126] S207: Determine the exploration location of non-structural oil and gas reservoirs in the slope zone based on the direction of oil and gas migration and the dominant sand body layers.

[0127] Step S207 includes:

[0128] The first step is to draw a sandstone equal thickness map based on the thickness of the sandstone reservoir in multiple pilot wells.

[0129] like Figure 7 As shown in the figure, by drawing contour maps of the sandstone reservoirs corresponding to all the pre-exploration wells according to their different thicknesses, we can obtain a sandstone equal thickness map (different colors in the figure represent different thickness ranges, see the lower right corner of the figure for details).

[0130] In the second step, the direction of oil and gas migration is superimposed on the sandstone isopach map.

[0131] like Figure 8 As shown, on the sandstone equal thickness map, the dominant sand body layers are calibrated, and the first reservoir category is marked as A and the second reservoir category is marked as B.

[0132] By superimposing the direction of oil and gas migration (the black dotted line with an arrow in the figure, i.e., the direction of oil and gas migration) with the sandstone isopach map, we can obtain a corresponding superimposed map of the direction of oil and gas migration on the sandstone isopach map.

[0133] The third step is to select the position corresponding to the dominant sand body layer in the direction of oil and gas migration on the sandstone isopach map as the exploration position.

[0134] In the above implementation, since the dominant sand body layer is divided according to the sandstone reservoir of the pre-exploration well, when actually determining the exploration position, the position corresponding to the dominant sand body layer is generally the position corresponding to multiple pre-exploration wells, that is, a certain area including these multiple pre-exploration wells. The position corresponding to the dominant sand body layer in the oil and gas migration direction can be used as the exploration position.

[0135] like Figure 8 As shown in the figure, the sandstone reservoirs corresponding to B22 and B23X1 are A and B, respectively, that is, they are both dominant sandstone layers, and the B22 and B23X1 wells are located in the direction of oil and gas migration, so the area around the B22 and B23X1 well areas is the corresponding exploration location. Similarly, the areas around the Q417 well area, B19, F29, and Gs27 well areas are also corresponding exploration locations.

[0136] The following is a specific example to illustrate the above method:

[0137] The above determination method is illustrated by taking a slope zone in Qikou Depression as a specific example.

[0138] The first step is to determine the oil and gas accumulation period in the slope zone:

[0139] First, several sampling wells are selected in the slope zone. In this embodiment, the selected sampling wells are GS39, F21 and K60 wells.

[0140] Secondly, the corresponding single-well burial history was constructed for the above three sampling wells.

[0141] Again, sampling was carried out on the above three sampling wells to obtain the corresponding sandstone reservoir samples.

[0142] Then, the homogenization temperature of fluid inclusions in sandstone reservoir samples was measured, and the measured temperature was projected onto the corresponding single well burial history.

[0143] This example takes three sampling wells Gs39, F21, and K60 as examples to obtain the single well burial history and fluid inclusion uniform temperature projection diagram of the three sampling wells (see Figure 3-5 ).

[0144] according to Figure 3-5 , it can be determined that the oil and gas accumulation period of the slope zone is the deposition period of the Minghuazhen Formation (see the previous text for details).

[0145] Step 2: Determine the direction of oil and gas migration.

[0146] Firstly, the 3D seismic interpretation technology is used to construct the paleo-top structural map of the oil and gas migration layer in the sandstone reservoir in the slope zone (the sandstone reservoir here refers to the corresponding Shahejie Formation Section 3, hereinafter referred to as Sha Section 3) and then restore the paleo-top structural map to the Minghuazhen Formation depositional period to obtain the top structural map of the oil and gas migration layer during the oil and gas accumulation period.

[0147] Then, the oil and gas migration channel index is calculated by formula (1), and the calculation results are superimposed on the top surface structure map (see Figure 6 ).

[0148] Then, the direction of oil and gas migration can be determined by combining the distribution of paleo-structural ridges in the top surface structural map and the magnitude of the oil and gas migration channel index (see Figure 6 ).

[0149] Step 3: Determine the dominant sand body layer.

[0150] First, the thickness of the sandstone reservoir in the third section of each exploration well in the slope zone was counted, and the sandstone isopach map of the slope zone was drawn (see Figure 7 ).

[0151] from Figure 7 It can be seen that different grayscales represent different thicknesses of sandstone reservoirs. The thickness of sandstone reservoirs near wells B19, Q417, B22 in the north is greater than 40 m, the thickness of sandstone reservoirs near wells Bs8, B28X1, B29X1, B10X1, Q134-1 in the southeast is greater than 40 m, and the thickness of sandstone reservoirs near wells Q27, Qb5, Q618, Q83, Q56 in the southwest is greater than 40 m, that is, the thickness of sandstone reservoirs in the above areas is relatively large.

[0152] Then, we selected the exploration wells whose sandstone reservoir thickness was greater than the average sandstone thickness, counted the logging data of these exploration wells, and divided the sandstone reservoirs of these exploration wells into five major categories.

[0153] The sandstone reservoirs belonging to the first reservoir category and the second reservoir category are regarded as the dominant sandstone layers.

[0154] Finally, according to the reservoir type determined in the previous step, the sandstone reservoirs of the pilot wells in the slope zone are classified on the sandstone isopach map, and the direction of oil and gas migration is superimposed on the sandstone isopach map (see Figure 8 ).

[0155] In actual operation, the sandstone reservoirs corresponding to the fifth reservoir category are generally not taken as research objects because of their poor reservoir performance.

[0156] On the sandstone isopach map, the positions corresponding to the dominant sand layers in the direction of oil and gas migration are used as the exploration positions of non-structural oil and gas reservoirs in the slope zone, such as the B22, B23X1, and Q417 well blocks and the B19, F29, and Gs27 well blocks (black dotted lines) in the northwest direction of the slope.

[0157] Fig. 9 is a schematic diagram of a device for determining the exploration position of an oil and gas reservoir provided by an embodiment of the present disclosure, combined with Fig. 9 The device has the function of implementing the above method example, and the function can be implemented by hardware or by hardware executing corresponding software. The determination device is used to determine the exploration position of non-structural oil and gas reservoirs. The determination device includes: a direction determination module 91 for oil and gas migration, a dominant sand body layer determination module 92, and an exploration position determination module 93.

[0158] The oil and gas migration direction determination module 91 is used to determine the direction of oil and gas migration in the slope belt based on the oil and gas accumulation period of the slope belt. The oil and gas accumulation period is the geological history period when the slope belt gathers to form oil and gas reservoirs. The dominant sand body layer determination module 92 is used to determine the dominant sand body layer in the sandstone reservoir of the slope belt. The slope belt is provided with multiple pre-exploration wells. The dominant sand body layer is a sandstone reservoir corresponding to the oil and gas production volume of the pre-exploration wells being higher than the average production volume, and the sandstone storage thickness of the dominant sand body layer is higher than the average sandstone thickness. The average production volume is the average production volume of multiple pre-exploration wells, and the average sandstone thickness is the average storage thickness of the sandstone of multiple pre-exploration wells. The exploration position determination module 93 is used to determine the exploration position of the non-structural oil and gas reservoir in the slope belt based on the direction of oil and gas migration and the dominant sand body layer.

[0159] Determine the device has Figure 1 All the beneficial effects of the determination method shown are not described in detail here.

[0160] Optionally, the oil and gas migration direction determination module 91 includes:

[0161] The oil and gas migration layer determination submodule 911 is used to determine the oil and gas migration layer in the slope zone;

[0162] The top surface structural map construction submodule 912 is used to construct the top surface structural map of the oil and gas migration layer during the oil and gas accumulation period;

[0163] The oil and gas migration channel index determination submodule 913 is used to calculate the oil and gas migration channel index corresponding to each exploration well based on the logging data of the exploration well;

[0164] A submodule 914 for determining the direction of oil and gas migration, for determining the direction of oil and gas migration based on the top surface structural map and the oil and gas migration channel index;

[0165] Optionally, the oil and gas migration channel index determination submodule 913 is further used to calculate the oil and gas migration channel index by the following formula:

[0166]

[0167] Wherein, HMIe is the oil and gas migration pathway index, dimensionless; h 含油 is the thickness of the oil-bearing sandstone reservoir, in m; h 油浸 is the thickness of the oil-immersed sandstone reservoir, in m; h 油斑 is the sandstone reservoir thickness of the oil spot, in m; h 油迹 is the thickness of the sandstone reservoir with oil traces, in m; h 荧光 is the thickness of the fluorescent sandstone reservoir, in m; H is the thickness of the sandstone reservoir, in m.

[0168] Optionally, the dominant sand body layer determination module 92 includes:

[0169] The different reservoir category determination submodule 921 is used to obtain different reservoir categories of the slope zone based on the logging data of the statistical well.

[0170] The dominant sand body layer determination submodule 922 is used to determine the dominant sand body layer in the slope zone based on the reservoir type.

[0171] Optionally, the different reservoir category determination submodule 921 is used to classify the sandstone reservoirs, and the reservoir categories include: the first reservoir category, the second reservoir category, the third reservoir category, the fourth reservoir category and the fifth reservoir category. The first reservoir category is the sandstone reservoir corresponding to the pre-exploration well, in which the thickness of the oil-bearing sandstone reservoir is greater than 0; the second reservoir category is the sandstone reservoir corresponding to the pre-exploration well, in which the thickness of the oil-bearing sandstone reservoir is equal to 0, and the thickness of the oil-immersed sandstone reservoir is greater than 0; the third reservoir category is the sandstone reservoir corresponding to the pre-exploration well, in which the thickness of the oil-bearing sandstone reservoir is equal to 0 and the thickness of the oil-immersed sandstone reservoir is greater than 0. The thickness of the oil-immersed sandstone reservoir is equal to 0, and the thickness of the sandstone reservoir with oil spots is greater than 0; the fourth reservoir category is the sandstone reservoir corresponding to the exploration well, in which the thickness of the oil-bearing sandstone reservoir, the thickness of the oil-immersed sandstone reservoir, and the thickness of the sandstone reservoir with oil spots are respectively equal to 0, and the thickness of the sandstone reservoir with oil traces is greater than 0; the fifth reservoir category is the sandstone reservoir corresponding to the exploration well, in which the thickness of the oil-bearing sandstone reservoir, the thickness of the oil-immersed sandstone reservoir, the thickness of the sandstone reservoir with oil spots, and the thickness of the sandstone reservoir with oil traces are respectively equal to 0, and the thickness of the fluorescent sandstone reservoir is greater than 0.

[0172] Optionally, the exploration position determination module 93 includes:

[0173] The sandstone thickness equalization map drawing submodule 931 is used to draw a sandstone thickness equalization map according to the thickness of the sandstone reservoir in multiple pre-exploration wells.

[0174] The superimposition submodule 932 is used to superimpose the direction of oil and gas migration on the sandstone isopach map.

[0175] The exploration position determination submodule 933 is used to use the position corresponding to the dominant sand body layer in the direction of oil and gas migration on the sandstone isopach map as the exploration position.

[0176] Optionally, the determination device also includes an oil and gas accumulation period determination module 94, which is used to obtain multiple sandstone reservoir samples from multiple sampling wells, and the multiple sampling wells are some of the multiple exploration wells; perform fluid inclusion uniform temperature measurement on the multiple sandstone reservoir samples respectively to obtain corresponding multiple temperature data; construct a single well burial history of each sampling well, and the single well burial history is a change diagram of the uplift or settlement of the formation in the corresponding sampling well over time; determine the oil and gas accumulation period based on the temperature data and the single well burial history.

[0177] Fig.10 is a schematic diagram of a computer device provided by an embodiment of the present disclosure, combined with Fig.10 , the computer device 100 may include one or more of the following components: a processor 101 , a memory 102 , a communication interface 103 , and a bus 104 .

[0178] The processor 101 includes one or more processing cores, and the processor 101 executes various functional applications and information processing by running software programs and modules. The memory 102 and the communication interface 103 are connected to the processor 101 through the bus 104. The memory 102 can be used to store at least one instruction, and the processor 101 is used to execute the at least one instruction to implement each step in the above method.

[0179] In addition, the memory 102 can be implemented by any type of volatile or non-volatile storage device or a combination thereof, and the volatile or non-volatile storage device includes but is not limited to: a magnetic disk or an optical disk, an electrically erasable programmable read-only memory (EEPROM), an erasable programmable read-only memory (EPROM), a static random access memory (SRAM), a read-only memory (ROM), a magnetic memory, a flash memory, and a programmable read-only memory (PROM).

[0180] The embodiment of the present disclosure also provides a computer storage medium, and when the computer instructions are executed by a processor, the above method for determining the exploration position of a non-structural oil and gas reservoir is implemented.

[0181] The above description is only an optional embodiment of the present disclosure and is not intended to limit the present disclosure. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present disclosure shall be included in the protection scope of the present disclosure.

Claims

1. A method for determining the exploration position of an oil and gas reservoir, characterized in that: For determining the exploration position of non-structural oil and gas reservoirs in a slope zone, the determination method comprises: Determining the oil and gas migration layer in the slope zone, wherein the oil and gas migration layer is a sandstone reservoir containing oil and gas; Constructing a top surface structural map of the oil and gas migration layer during the oil and gas accumulation period; Based on the logging data of the prospecting wells, the oil and gas migration channel index corresponding to each of the prospecting wells is calculated by the following formula: ； Wherein, HMIe is the oil and gas migration channel index, dimensionless; h 含油 is the thickness of the oil-bearing sandstone reservoir, in m; h 油浸 is the thickness of the oil-immersed sandstone reservoir, in m; h 油斑 is the sandstone reservoir thickness of the oil patch, in m; h 油迹 is the thickness of the sandstone reservoir of the oil trace, in m; h 荧光 is the thickness of the fluorescent sandstone reservoir, in m; H is the thickness of the sandstone reservoir, in m; the oil and gas migration channel index is used to indicate the migration capacity of the channel for oil and gas migration in the sandstone reservoir of the corresponding exploration well; Based on the top surface structural map and the oil and gas migration channel index, the direction of oil and gas migration is determined, and the oil and gas accumulation period is the geological history period when the slope belt accumulates to form oil and gas reservoirs; Based on the logging data of the statistical well, different reservoir categories of the slope zone are obtained, wherein the statistical well is a pre-exploration well having a sandstone reservoir with a thickness greater than an average sandstone thickness; Based on the reservoir category, determining a dominant sand body layer in the slope zone, wherein a plurality of pre-exploration wells are provided in the slope zone, the dominant sand body layer is a sandstone reservoir in the pre-exploration wells whose oil and gas production volume is higher than the average production volume, and the sandstone reservoir thickness of the dominant sand body layer is higher than the average sandstone thickness, the average production volume is the average production volume of the plurality of pre-exploration wells, and the average sandstone thickness is the average sandstone reservoir thickness of the plurality of pre-exploration wells; Drawing a sandstone equal thickness map according to the thickness of the sandstone reservoirs in the plurality of pre-exploration wells; superimposing the direction of oil and gas migration on the sandstone isopach map; On the sandstone isopach map, the position corresponding to the dominant sand body layer in the direction of oil and gas migration is used as the exploration position of the non-structural oil and gas reservoir in the slope zone.

2. The determination method according to claim 1, characterized in that: The logging data include: the thickness of the oil-bearing sandstone reservoir in the well, the thickness of the oil-soaked sandstone reservoir in the well, the thickness of the oil-spotted sandstone reservoir in the well, the thickness of the oil-stained sandstone reservoir in the well, the thickness of the fluorescent sandstone reservoir in the well, and the thickness of the sandstone reservoir in the well; The reservoir categories include: the first reservoir category, the second reservoir category, the third reservoir category, the fourth reservoir category and the fifth reservoir category. The first reservoir category is the sandstone reservoir corresponding to the pre-exploration well, in which the thickness of the oil-bearing sandstone reservoir is greater than 0; The second reservoir category is the sandstone reservoir corresponding to the pre-exploration well, in which the thickness of the oil-bearing sandstone reservoir is equal to 0 and the thickness of the oil-immersed sandstone reservoir is greater than 0; The third reservoir category is the sandstone reservoir corresponding to the pre-exploration well, in which the thickness of the oil-bearing sandstone reservoir and the thickness of the oil-immersed sandstone reservoir are both equal to 0, and the thickness of the oil-spotted sandstone reservoir is greater than 0; The fourth reservoir category is the sandstone reservoir corresponding to the pre-exploration well, in which the thickness of the oil-bearing sandstone reservoir, the thickness of the oil-immersed sandstone reservoir and the thickness of the oil-spotted sandstone reservoir are respectively equal to 0, and the thickness of the oil-stain sandstone reservoir is greater than 0; The fifth reservoir category is the sandstone reservoir corresponding to the pre-exploration well, in which the thickness of the oil-containing sandstone reservoir, the thickness of the oil-immersed sandstone reservoir, the thickness of the oil-spotted sandstone reservoir and the thickness of the oil-trace sandstone reservoir are respectively equal to 0, and the thickness of the fluorescent sandstone reservoir is greater than 0.

3. The determination method according to claim 1, characterized in that: Before determining the direction of oil and gas migration in the slope zone, the determination method further includes: Acquire a plurality of sandstone reservoir samples from each of the plurality of sampling wells, wherein the plurality of sampling wells are part of the plurality of pre-exploration wells; Conducting fluid inclusion homogenization temperature measurement on the plurality of sandstone reservoir samples respectively to obtain corresponding plurality of temperature data; Constructing a single well burial history of each of the sampling wells, wherein the single well burial history is a graph showing changes in the uplift or subsidence of the strata in the corresponding sampling well over time; The oil and gas accumulation period is determined based on the temperature data and the burial history of the single well.

4. A device for determining the exploration position of an oil and gas reservoir, characterized in that: The determining device is based on the method for determining the exploration position of an oil and gas reservoir according to any one of claims 1 to 3, and the determining device comprises: The oil and gas migration direction determination module is used to determine the oil and gas migration layer in the slope zone, the oil and gas migration layer is a sandstone reservoir containing oil and gas; construct a top surface structural map of the oil and gas migration layer during the oil and gas accumulation period; based on the logging data of the pre-exploration well, calculate the oil and gas migration channel index corresponding to each pre-exploration well by the following formula: ； Wherein, HMIe is the oil and gas migration channel index, dimensionless; h 含油 is the thickness of the oil-bearing sandstone reservoir, in m; h 油浸 is the thickness of the oil-immersed sandstone reservoir, in m; h 油斑 is the sandstone reservoir thickness of the oil patch, in m; h 油迹 is the thickness of the sandstone reservoir of the oil trace, in m; h 荧光 is the thickness of the fluorescent sandstone reservoir, in m; H is the thickness of the sandstone reservoir, in m; the oil and gas migration channel index is used to indicate the migration capacity of the channel for oil and gas migration in the sandstone reservoir of the corresponding exploration well; based on the top surface structural map and the oil and gas migration channel index, the direction of oil and gas migration is determined; the oil and gas accumulation period is the geological history period when the slope belt accumulates to form oil and gas reservoirs; A module for determining a dominant sand body layer is used to obtain different reservoir categories of the slope zone based on the logging data of a statistical well, wherein the statistical well is a pre-exploration well having a sandstone reservoir with a thickness greater than an average sandstone thickness; based on the reservoir category, determine a dominant sand body layer in the slope zone, wherein the slope zone is provided with a plurality of pre-exploration wells, wherein the dominant sand body layer is a sandstone reservoir corresponding to an oil and gas production volume of the pre-exploration well being higher than an average production volume, and the sandstone storage thickness of the dominant sand body layer is higher than an average sandstone thickness, wherein the average production volume is an average production volume of the plurality of pre-exploration wells, and the average sandstone thickness is an average sandstone storage thickness of the plurality of pre-exploration wells; The exploration position determination module is used to draw a sandstone isopach map according to the thickness of the sandstone reservoir in the multiple pre-exploration wells; superimpose the direction of oil and gas migration on the sandstone isopach map; and on the sandstone isopach map, use the position corresponding to the dominant sand body layer in the direction of oil and gas migration as the exploration position of the non-structural oil and gas reservoir in the slope zone.

5. A computer device, characterized in that: The computer device comprises a processor and a memory configured to store instructions executable by the processor; the processor is configured to execute the method for determining the reservoir exploration position of an oil and gas reservoir as claimed in any one of claims 1 to 3.

6. A computer storage medium having computer instructions stored thereon, characterized in that: When the computer instructions are executed by a processor, the method for determining the exploration position of an oil and gas reservoir as claimed in any one of claims 1 to 3 is implemented.

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