Data acquisition method and system applied to petroleum geological exploration

Abstract

The invention relates to the technical field of petroleum geological exploration, in particular to a data acquisition method and system applied to petroleum geological exploration, and the method comprises the steps: calculating a petroleum potential rate based on a potential coefficient, a real availability value, and gravity values of an initial exploration point and surrounding exploration points; calculating a correction degree according to the altitude values of the two optional initial exploration points and the petroleum potential rates, obtaining a correction value based on the correction degree and the petroleum potential rates of the two initial exploration points corresponding to the correction degree, and obtaining a final petroleum potential rate based on the correction value and the distance between the two initial exploration points corresponding to the correction value; and obtaining the coordinate of an optimal exploration point according to the final potential rate of the petroleum and the coordinate of the initial exploration point, taking the optimal exploration point as the initial exploration point, and repeating the obtaining process of the optimal exploration point to obtain the coordinate of the next optimal exploration point. According to the invention, the arrangement of the exploration points is more targeted, and the data acquisition precision is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of petroleum geological exploration, and in particular to a data acquisition method and system applied to petroleum geological exploration. Background Art

[0002] Petroleum geological exploration is crucial for accurately revealing the distribution pattern, reserve size, and quality of underground petroleum resources, providing a solid scientific basis for oil extraction activities. Among numerous exploration technologies, gravity exploration stands out for its widespread application and high efficiency over large areas, especially in the initial exploration phase. As a non-invasive exploration method, it precisely measures subtle changes in the underground gravity field to interpret geological information, eliminating the need for drilling. This approach is both relatively low-cost and minimally disruptive to the environment.

[0003] Systematically collecting gravity data from multiple exploration points is a key component of petroleum exploration using gravity methods. Because areas of low gravity often indicate the presence of large underground cavities, fractures, or low-density rock formations—traits commonly found in oil and gas reservoirs—exploration points with low gravity values are often considered key indicators of potential oil reservoirs. Accurately identifying these low-gravity anomalies can provide valuable clues and evidence for the potential location of oil reservoirs.

[0004] Currently, gravity surveying requires the use of gravimetric instruments at widely distributed survey points, often with relatively close spacing between them. This approach complicates equipment deployment and operation, poses significant challenges to data collection, and significantly increases costs. Summary of the Invention

[0005] In order to solve the technical problems in the prior art caused by the large number of exploration points and the lack of targetedness, which leads to complex equipment layout and operation process and increased costs, the purpose of the present invention is to provide a data acquisition method for petroleum geological exploration. The technical solution adopted is as follows:

[0006] Determining an initial exploration point in a petroleum geological exploration target area, and determining surrounding exploration points at preset distances from the initial exploration point;

[0007] calculating a potential coefficient based on the altitude values of the initial exploration point and the surrounding exploration points, calculating a true availability value based on the altitude values and gravity values of the initial exploration point and the surrounding exploration points, and calculating an oil potential rate based on the potential coefficient, the true availability value, and the gravity values of the initial exploration point and the surrounding exploration points;

[0008] Calculating a correction degree based on the altitude values of two selected initial exploration points and the oil potential rate, obtaining a correction value based on the correction degree and the oil potential rates of the two initial exploration points corresponding to the correction degree, and obtaining a final oil potential rate based on the correction value and the distance between the two initial exploration points corresponding to the correction value;

[0009] The coordinates of the optimal exploration point are obtained according to the final oil potential rate and the coordinates of the initial exploration point. The optimal exploration point is used as the initial exploration point, and the optimal exploration point acquisition process is repeated to obtain the coordinates of the next optimal exploration point.

[0010] Furthermore, the process of obtaining the potential coefficient includes:

[0011] The altitude value of the initial exploration point and the altitude values of the surrounding exploration points corresponding to the initial exploration point are sequentially added together and then normalized to obtain a first altitude normalized value;

[0012] The potential coefficient of the initial exploration point is obtained by subtracting the first altitude normalized value from a preset value.

[0013] Furthermore, the process of obtaining the real availability value includes:

[0014] subtracting the altitude value of the i-th initial exploration point from the altitude value of the j-th surrounding exploration point corresponding to the i-th initial exploration point, and then performing normalization processing to obtain a second altitude normalized value;

[0015] subtracting the gravity value of the i-th initial exploration point from the gravity value of the j-th surrounding exploration point corresponding to the i-th initial exploration point, and then performing normalization processing to obtain a gravity normalization value;

[0016] The second altitude normalized value is subtracted from the gravity normalized value and the negation thereof is taken as the input value of an exponential function with base e, and the output value of the exponential function is used as the true availability value obtained by calculating the oil potential ratio of the j-th surrounding exploration point to the i-th initial exploration point.

[0017] Furthermore, the process of obtaining the oil potential rate includes:

[0018] Subtracting the gravity value of the i-th initial exploration point from the gravity value of the j-th surrounding exploration point corresponding to the i-th initial exploration point, and then multiplying the result by the true availability value obtained by the oil potential rate of the j-th surrounding exploration point to the i-th initial exploration point to obtain a true available gravity value difference between the i-th initial exploration point and the j-th surrounding exploration point;

[0019] Repeating the process of obtaining the true available gravity value difference component to obtain the true available gravity value difference component when the i-th initial exploration point is compared with each of the corresponding surrounding exploration points;

[0020] The true available gravity value difference components are sequentially added to obtain the true available gravity value difference, and the normalized value of the true available gravity value difference is multiplied by the potential coefficient of the i-th initial exploration point to obtain the oil potential rate of the i-th initial exploration point.

[0021] Furthermore, the process of obtaining the correction degree includes:

[0022] Normalizing the square of the value obtained by subtracting the altitude value of the i-th initial exploration point from the altitude value of the k-th initial exploration point to obtain a third altitude normalized value;

[0023] Normalizing the absolute value of the oil potential rate at the i-th initial exploration point minus the oil potential rate at the k-th initial exploration point to obtain a normalized oil potential rate value;

[0024] The absolute value of the difference between the third normalized value of the altitude and the normalized value of the oil potential rate is used as the correction degree of the oil potential rate of the kth initial exploration point to the ith initial exploration point.

[0025] Furthermore, the process of obtaining the correction value includes:

[0026] When the oil potential rate of the i-th initial exploration point is less than the oil potential rate of the k-th initial exploration point, the value between the oil potential rate of the k-th initial exploration point and the oil potential rate of the i-th initial exploration point is multiplied by the correction degree of the oil potential rate of the k-th initial exploration point to the i-th initial exploration point, and then added to the oil potential rate of the i-th initial exploration point to obtain the corrected value of the oil potential rate of the k-th initial exploration point to the i-th initial exploration point.

[0027] Furthermore, the process of obtaining the correction value further includes:

[0028] When the oil potential rate of the i-th initial exploration point is greater than or equal to the oil potential rate of the k-th initial exploration point, the oil potential rate of the i-th initial exploration point is used as the corrected value after the k-th initial exploration point corrects the oil potential rate of the i-th initial exploration point.

[0029] Furthermore, the process of obtaining the oil ultimate potential rate includes:

[0030] The inverse of the distance between the i-th initial exploration point and the k-th initial exploration point is used as an input value of an exponential function with base e, and the output value of the exponential function is used as a distance component of the k-th initial exploration point relative to the i-th initial exploration point;

[0031] Repeating the distance component acquisition process to acquire the distance component of each of the initial exploration points relative to the i-th initial exploration point, and sequentially adding the distance components to obtain a sum of the distance components;

[0032] Dividing the distance component of the kth initial exploration point relative to the ith initial exploration point by the sum of the distance components, and then multiplying the result by the correction value of the oil potential rate of the kth initial exploration point to the ith initial exploration point to obtain a final oil potential rate component of the kth initial exploration point to the ith initial exploration point;

[0033] Repeat the process of obtaining the final potential rate component of oil to obtain the final potential rate component of oil of each initial exploration point to the i-th initial exploration point, and add the final potential rate components of oil in sequence to obtain the final potential rate of oil of the i-th initial exploration point.

[0034] Furthermore, the process of obtaining the coordinates of the optimal exploration point includes:

[0035] The final oil potential rate of the i-th initial exploration point is divided by the sum of the final oil potential rates of all the initial exploration points, and then multiplied by the abscissa of the i-th initial exploration point to obtain the abscissa component corresponding to the i-th initial exploration point;

[0036] Repeating the process of obtaining the horizontal coordinate components to obtain the horizontal coordinate components corresponding to each of the initial exploration points, and sequentially adding the horizontal coordinate components to obtain the horizontal coordinate of the optimal exploration point;

[0037] The final oil potential rate of the i-th initial exploration point is divided by the sum of the final oil potential rates of all the initial exploration points, and then multiplied by the ordinate of the i-th initial exploration point to obtain the ordinate component corresponding to the i-th initial exploration point;

[0038] The process of obtaining the ordinate components is repeated to obtain the ordinate components corresponding to the initial exploration points, and the ordinate components are sequentially added to obtain the ordinate of the optimal exploration point.

[0039] An embodiment of the present invention also provides a data acquisition system for petroleum geological exploration, the system comprising a memory, a processor, and a computer program stored in the memory and running on the processor, wherein the processor implements the steps of the above method when executing the computer program.

[0040] The present invention has the following beneficial effects:

[0041] First, an initial exploration point is determined in the target area for petroleum geological exploration, and surrounding exploration points are determined at preset distances from the initial exploration point. The initial exploration point and the surrounding exploration points are both basic exploration points and are essential exploration points in petroleum geological exploration.

[0042] Next, a potential coefficient is calculated based on the altitude values of the initial exploration point and the surrounding exploration points. A true availability value is calculated based on the altitude values and gravity values of the initial exploration point and the surrounding exploration points. Finally, an oil potential rate is calculated based on the potential coefficient, the true availability value, and the gravity values of the initial exploration point and the surrounding exploration points. The oil potential rate represents the probability of oil being present near the exploration point. The greater the oil potential rate, the greater the probability of oil being present near the exploration point.

[0043] Then, a correction degree is calculated based on the altitude values of the two selected initial exploration points and the oil potential ratios. A correction value is obtained based on the correction degree and the oil potential ratios of the two initial exploration points corresponding to the correction degree. A final oil potential ratio is obtained based on the correction value and the distance between the two initial exploration points corresponding to the correction value. The final oil potential ratio is the final correction result of the oil potential ratio and more accurately represents the probability of oil presence near the exploration point.

[0044] Finally, the coordinates of the optimal exploration point are obtained based on the final oil potential and the coordinates of the initial exploration point. This optimal exploration point is used as the initial exploration point, and the optimal exploration point acquisition process is repeated to obtain the coordinates of the next optimal exploration point. After obtaining the coordinates of the optimal exploration point, it is added to the initial exploration points, and the coordinates of the next optimal exploration point are then obtained. This cycle repeats. By targetedly deploying exploration points, the system focuses on potential oil-rich areas, significantly improving data acquisition accuracy and effectively reducing exploration costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0045] In order to more clearly illustrate the technical solutions and advantages of the embodiments of the present invention or the prior art, the following briefly introduces the drawings required for use in the embodiments or the prior art descriptions. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0046] Figure 1 A flow chart of a data acquisition method for petroleum geological exploration provided by the first embodiment of the present invention;

[0047] Figure 2 A flowchart of a process for obtaining a potential coefficient according to a second embodiment of the present invention;

[0048] Figure 3 A flowchart of a process for obtaining a true availability value provided in the third embodiment of the present invention;

[0049] Figure 4 A flowchart of a process for obtaining oil potential rate provided by a fourth embodiment of the present invention;

[0050] Figure 5 A flowchart of a correction degree acquisition process provided in a fifth embodiment of the present invention;

[0051] Figure 6 A flowchart of a process for obtaining the final potential rate of oil provided by a sixth embodiment of the present invention;

[0052] Figure 7 This is a flow chart of a process for obtaining coordinates of an optimal exploration point provided by the seventh embodiment of the present invention. DETAILED DESCRIPTION

[0053] To further illustrate the technical means and effectiveness of the present invention in achieving its intended objectives, the following, in conjunction with the accompanying drawings and preferred embodiments, describes in detail a data acquisition method and system for petroleum geological exploration, including its specific implementation, structure, features, and effectiveness. In the following description, references to "one embodiment" or "another embodiment" do not necessarily refer to the same embodiment. Furthermore, specific features, structures, or characteristics of one or more embodiments may be combined in any suitable manner.

[0054] Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs.

[0055] It should be noted that in order to ensure that the calculation results are meaningful, when performing fractional operations in the embodiments of the present invention, when encountering a situation where the denominator is 0, it is necessary to add a parameter adjustment factor greater than 0 to the denominator to prevent the denominator from being 0. The value of the parameter adjustment factor is set by the implementer according to actual conditions, and this application does not impose any special restrictions.

[0056] A specific solution of a data acquisition method for petroleum geological exploration provided by the present invention will be described in detail below with reference to the accompanying drawings.

[0057] See also Figure 1 , which shows a flow chart of a data acquisition method for petroleum geological exploration provided by a first embodiment of the present invention, the method comprising:

[0058] S101. Determine an initial exploration point in a petroleum geological exploration target area, and determine surrounding exploration points at preset distances from the initial exploration point.

[0059] The initial exploration points may be independently set along the outer edge of the petroleum geological exploration target area. Preferably, one initial exploration point is set every 5 km along the outer edge of the petroleum geological exploration target area.

[0060] The preset distance can be set independently, preferably 500m.

[0061] The number of the surrounding exploration points can be set independently, preferably 36. The initial exploration point can be used as the center of the circle, the preset distance can be used as the radius, and a surrounding gravity exploration point can be set on the circumference every 10 degrees of the central angle.

[0062] S102. Calculate a potential coefficient based on the altitude values of the initial exploration point and the surrounding exploration points, calculate a true availability value based on the altitude values and gravity values of the initial exploration point and the surrounding exploration points, and calculate an oil potential rate based on the potential coefficient, the true availability value, and the gravity values of the initial exploration point and the surrounding exploration points.

[0063] The process of obtaining the potential coefficient will be described in detail in the second embodiment and will not be repeated here.

[0064] The process of obtaining the real availability value will be described in detail in the third embodiment and will not be repeated here.

[0065] The process of obtaining the oil potential rate will be described in detail in the fourth embodiment and will not be repeated here.

[0066] S103. Calculate a correction degree based on the altitude values of two selected initial exploration points and the oil potential rate, obtain a correction value based on the correction degree and the oil potential rate of the two initial exploration points corresponding to the correction degree, and obtain a final oil potential rate based on the correction value and the distance between the two initial exploration points corresponding to the correction value.

[0067] The process of obtaining the correction degree will be described in detail in the fifth embodiment and will not be repeated here.

[0068] The process of obtaining the correction value includes:

[0069] When the oil potential rate of the i-th initial exploration point is less than the oil potential rate of the k-th initial exploration point, the value between the oil potential rate of the k-th initial exploration point and the oil potential rate of the i-th initial exploration point is multiplied by the correction degree of the oil potential rate of the k-th initial exploration point to the i-th initial exploration point, and then added to the oil potential rate of the i-th initial exploration point to obtain the corrected value of the oil potential rate of the k-th initial exploration point to the i-th initial exploration point.

[0070] When the oil potential rate of the i-th initial exploration point is greater than or equal to the oil potential rate of the k-th initial exploration point, the oil potential rate of the i-th initial exploration point is used as the corrected value after the k-th initial exploration point corrects the oil potential rate of the i-th initial exploration point.

[0071] Taking the corrected value of the oil potential rate of the kth initial exploration point after correction of the i-th initial exploration point as an example, if the oil potential rate of the kth initial exploration point is smaller than the oil potential rate of the i-th initial exploration point, then no correction is required. If the oil potential rate of the kth initial exploration point is larger than the oil potential rate of the i-th initial exploration point, then it is necessary to correct the influence of the insignificant gravity monitoring of the i-th initial exploration point caused by sedimentation. In this case, the corrected value of the i-th initial exploration point is not only the oil potential rate W of the i-th initial exploration point i If the correction degree obtained above is larger, it should be closer to the oil potential rate W of the kth initial exploration point. k , then the following formula can be constructed to represent the corrected value of the oil potential rate of the kth initial exploration point after correction to the ith initial exploration point.

[0072] The correction value can be expressed as:

[0073]

[0074] Among them, the P i-k represents the corrected value of the oil potential rate of the kth initial exploration point to the ith initial exploration point, and the W i represents the oil potential rate of the i-th initial exploration point, the W k represents the oil potential rate of the kth initial exploration point, the H i-k It represents the correction degree of the oil potential rate of the kth initial exploration point to the ith initial exploration point.

[0075] The oil final potential rate will be described in detail in the sixth embodiment and will not be repeated here.

[0076] S104. Obtain the coordinates of the optimal exploration point based on the final oil potential rate and the coordinates of the initial exploration point, use the optimal exploration point as the initial exploration point, and repeat the optimal exploration point acquisition process to obtain the coordinates of the next optimal exploration point.

[0077] The process of obtaining the coordinates of the optimal exploration point will be described in detail in the seventh embodiment and will not be repeated here.

[0078] All exploration points (initial exploration points and surrounding exploration points) can be used to collect gravity using gravity measuring instruments (such as gravimeters), and their three-dimensional coordinates (x, y, z) can be accurately collected using GPS equipment.

[0079] Low-lying terrain is often the primary site for sediment accumulation, rich in organic matter, providing a plentiful material foundation for the formation of oil. Thanks to their deep sedimentary layers, these areas are more susceptible to conversion into oil resources after long periods of geological evolution. Furthermore, low-lying areas are often associated with tectonic movements such as crustal subsidence and fault activity. These tectonic conditions not only facilitate the accumulation of oil but also provide closed storage spaces for it. Furthermore, the region's hydrological environment also promotes the accumulation of organic matter, further accelerating the process of oil formation. In summary, low-lying terrain, thanks to its unique environmental conditions, has become a region with enormous potential for oil resources.

[0080] Figure 2 This is a flow chart of a process for obtaining a potential coefficient provided by the second embodiment of the present invention. The process for obtaining a potential coefficient includes:

[0081] S201. The altitude value of the initial exploration point and the altitude values of the surrounding exploration points corresponding to the initial exploration point are sequentially added together and then normalized to obtain a first normalized altitude value.

[0082] The first altitude normalized value can be expressed as:

[0083]

[0084] Among them, the z i represents the altitude value of the i-th initial exploration point, the z ij represents the altitude value of the jth surrounding exploration point corresponding to the i-th initial exploration point, J represents the number of the surrounding exploration points, f( ) represents a normalization function, preferably a range normalization function, the value of i ranges from 1 to the number of the initial exploration points, and the value of j ranges from 1 to the number of the surrounding exploration points.

[0085] S202. Obtain the potential coefficient of the initial exploration point by subtracting the first altitude normalized value from a preset value.

[0086] The potential coefficient can be expressed as:

[0087]

[0088] Among them, the H i represents the potential coefficient of the i-th initial exploration point, and R represents the preset value, which is preferably 1.

[0089] For the initial exploration point, the smaller the sum of its altitude value with the corresponding surrounding exploration points, the smaller the The larger it is, the more likely it is that there is oil nearby.

[0090] Because oil is generally less dense than most rocks, the average underground density around oil reservoirs is correspondingly lower, which directly results in relatively low gravity values in this area (gravity is proportional to the density of the material). As exploration proceeds deeper, the changes in underground gravity anomalies gradually weaken, making the gravity signal of deep oil and gas reservoirs increasingly weak. Therefore, near the top of the oil reservoir (i.e., at a lower exploration point elevation), the detected gravity values tend to be lower; conversely, farther from the top of the oil reservoir (i.e., at a higher exploration point elevation), the detected gravity values are relatively higher. Based on this principle, if the jth surrounding exploration point corresponding to the i-th initial exploration point can effectively indicate the oil potential of the i-th initial exploration point, then the higher the elevation of the j-th surrounding exploration point, the greater the measured gravity value relative to the i-th initial exploration point.

[0091] Figure 3 This is a flowchart of a process for obtaining a real availability value provided in the third embodiment of the present invention. The process for obtaining a real availability value includes:

[0092] S301. Subtract the altitude value of the i-th initial exploration point from the altitude value of the j-th surrounding exploration point corresponding to the i-th initial exploration point, and then perform normalization processing to obtain a second altitude normalized value.

[0093] The second altitude normalized value can be expressed as:

[0094] f(z ij -z i );

[0095] Among them, the z i represents the altitude value of the i-th initial exploration point, the z ij represents the altitude value of the jth surrounding exploration point corresponding to the i-th initial exploration point, and f( ) represents a normalization function, preferably a range normalization function.

[0096] The f(z ij -z i ) represents the normalized difference in height of the jth surrounding exploration point relative to the ith initial exploration point.

[0097] S302. Subtract the gravity value of the i-th initial exploration point from the gravity value of the j-th surrounding exploration point corresponding to the i-th initial exploration point, and then perform normalization processing to obtain a gravity normalization value.

[0098] The gravity normalized value can be expressed as:

[0099] f(G ij -G i );

[0100] Among them, the G i represents the gravity value of the i-th initial exploration point, the G ij represents the gravity value of the jth surrounding exploration point corresponding to the i-th initial exploration point, and f( ) represents a normalization function, preferably a range normalization function.

[0101] The f(G ij -G i ) represents the normalized difference in gravity value between the jth surrounding exploration point and the ith initial exploration point.

[0102] S303. Subtract the second altitude normalized value from the gravity normalized value and then take the opposite value as the input value of an exponential function with base e, and the output value of the exponential function is used as the true availability value obtained by the oil potential rate of the j-th surrounding exploration point to the i-th initial exploration point.

[0103] The true availability value can be expressed as:

[0104] S ij =exp[-|f(z ij -z i )-f(G ij -G i )|];

[0105] Among them, the S ij represents the true availability value obtained by the oil potential rate of the j-th surrounding exploration point to the ith initial exploration point, exp represents an exponential function with e as the base, and || represents an absolute value function.

[0106] Taking the i-th initial exploration point as an example, generally speaking, the larger the potential coefficient, the higher the oil potential rate. However, the potential coefficient is only valid for a larger area and cannot be accurate to a single point. Therefore, based on the potential coefficient of the i-th initial exploration point, combined with the data of the surrounding exploration points, its oil potential rate is further determined.

[0107] Oil reservoirs typically exhibit low-density rock formations, a characteristic that results in localized gravity values being lower than those of surrounding areas. Therefore, it is typically necessary to compare the gravity value measured at the i-th initial exploration point with the gravity values of the corresponding surrounding exploration points. The lower the gravity value at the i-th initial exploration point, the better; that is, the gravity values of the surrounding exploration points should be greater than the gravity value at the i-th initial exploration point. Given that the actual availability of surrounding exploration points varies, a weighted approach can be used to determine the oil potential of the i-th initial exploration point.

[0108] Figure 4 This is a flow chart of a process for obtaining oil potential rate provided by a fourth embodiment of the present invention. The process for obtaining oil potential rate includes:

[0109] S401. Subtract the gravity value of the i-th initial exploration point from the gravity value of the j-th surrounding exploration point corresponding to the i-th initial exploration point, and then multiply the gravity value by the real availability value obtained by the oil potential rate of the j-th surrounding exploration point to the i-th initial exploration point to obtain the difference in real available gravity values between the i-th initial exploration point and the j-th surrounding exploration point.

[0110] The actual available gravity value difference can be expressed as:

[0111] S ij ×(G ij -G i );

[0112] Among them, the S ijrepresents the actual availability value obtained by the oil potential rate of the jth surrounding exploration point to the ith initial exploration point, and the G i represents the gravity value of the i-th initial exploration point, the G ij represents the gravity value of the jth surrounding exploration point corresponding to the i-th initial exploration point.

[0113] S402. Repeat the process of obtaining the true available gravity value difference to obtain the true available gravity value difference between the i-th initial exploration point and its corresponding surrounding exploration points.

[0114] S403. Add the true available gravity value difference components in sequence to obtain the true available gravity value difference, and multiply the normalized value of the true available gravity value difference by the potential coefficient of the i-th initial exploration point to obtain the oil potential rate of the i-th initial exploration point.

[0115] The oil potential can be expressed as:

[0116]

[0117] Among them, the H i represents the potential coefficient of the i-th initial exploration point, J represents the number of the surrounding exploration points, f( ) represents a normalization function, preferably a range normalization function, J represents the number of the surrounding exploration points, and W i represents the oil potential rate of the i-th initial exploration point.

[0118] According to the formation and evolution of rock formations, alternating processes of sedimentation and erosion result in variations in rock thickness and ground elevation across different regions. Sedimentation creates thicker layers in some areas, while erosion weakens or removes portions of the rock. This variation in geological evolution means that even though underground oil reservoirs may be relatively uniform within a certain depth range, the height of the surface rock layers can vary due to variations in deposition and erosion. Therefore, even at the same oil layer depth at different initial exploration points, differences in surface rock height still result in variations in elevation. According to Newton's law of universal gravitation, the change in the gravity field is inversely proportional to the square of the distance from the observation point. Therefore, if two initial gravity exploration points are located in the same oil layer, the difference in gravity should be inversely proportional to the square of the distance (after normalization, a larger difference favors the detection of gravity differences). Therefore, considering the impact of sedimentation on surface rock formations, it is necessary to correct for insignificant gravity monitoring due to sedimentation.

[0119] Figure 5This is a flow chart of a correction degree acquisition process provided in a fifth embodiment of the present invention. The correction degree acquisition process includes:

[0120] S501. Normalize the square of the value obtained by subtracting the altitude value of the i-th initial exploration point from the altitude value of the k-th initial exploration point to obtain a third normalized altitude value.

[0121] The third altitude normalized value can be expressed as:

[0122] f[(z i -z k ) 2 ];

[0123] Among them, the z i represents the altitude value of the i-th initial exploration point, the z k represents the altitude value of the kth initial exploration point, and f( ) represents a normalization function, preferably a range normalization function.

[0124] The value range of i is 1 to the number of the initial exploration points, the value range of k is 1 to the number of the initial exploration points, and i is not equal to k.

[0125] S502. Normalize the absolute value of the oil potential rate of the i-th initial exploration point minus the oil potential rate of the k-th initial exploration point to obtain a normalized oil potential rate value.

[0126] The normalized value of the oil potential rate can be expressed as:

[0127] f[|W i -W k |);

[0128] Wherein, the W i represents the oil potential rate of the i-th initial exploration point, the W k represents the oil potential rate of the kth initial exploration point, the f( ) represents a normalization function, preferably a range normalization function, and the || represents an absolute value function.

[0129] S503. Using the absolute value of the difference between the third normalized value of the altitude and the normalized value of the oil potential rate as the correction degree of the oil potential rate of the kth initial exploration point to the ith initial exploration point.

[0130] The correction degree of the oil potential rate of the kth initial exploration point to the ith initial exploration point can be expressed as:

[0131] H i-k=|f[(z i -z k ) 2 ]-f(|W i -W k |)|;

[0132] Among them, the H i-k It represents the correction degree of the oil potential rate of the kth initial exploration point to the ith initial exploration point.

[0133] Since gravity anomalies are usually local and their influence weakens with increasing distance, the initial key exploration point that is closer to the i-th initial exploration point is more affected by the gravity anomaly and is more sensitive to monitoring, and its correction value will have a more significant impact on the i-th initial exploration point; the initial key exploration point that is farther away from the i-th initial exploration point is less affected by the anomaly, and therefore, its correction value has a weaker impact on the i-th initial exploration point. Therefore, the distance is combined to perform weighted construction to construct the formula for obtaining the final potential rate of oil.

[0134] Figure 6 This is a flow chart of a process for obtaining the final potential rate of oil provided by a sixth embodiment of the present invention. The process for obtaining the final potential rate of oil includes:

[0135] S601. The inverse of the distance between the ith initial exploration point and the kth initial exploration point is used as an input value of an exponential function with base e, and the output value of the exponential function is used as a distance component of the kth initial exploration point relative to the ith initial exploration point.

[0136] The distance component can be expressed as:

[0137] exp[-d(i,k)];

[0138] Wherein, the d(i,k) represents the distance between the i-th initial exploration point and the k-th initial exploration point, and the exp represents an exponential function with e as the base.

[0139] S602. Repeat the distance component acquisition process to acquire the distance component of each initial exploration point relative to the i-th initial exploration point, and sequentially add the distance components to obtain the sum of the distance components.

[0140] The sum of the distance components can be expressed as:

[0141]

[0142] Wherein, N represents the number of the initial exploration points.

[0143] S603. After dividing the distance component of the kth initial exploration point relative to the ith initial exploration point by the sum of the distance components, multiply the result by the correction value of the oil potential rate of the kth initial exploration point to the ith initial exploration point to obtain the final oil potential rate component of the kth initial exploration point to the ith initial exploration point.

[0144] The oil ultimate potential rate component can be expressed as:

[0145]

[0146] Among them, the P i-k The corrected value represents the oil potential rate of the kth initial exploration point after correcting the oil potential rate of the ith initial exploration point.

[0147] S604. Repeat the process of obtaining the oil final potential rate component to obtain the oil final potential rate component of each initial exploration point to the i-th initial exploration point, and add the oil final potential rate components in sequence to obtain the oil final potential rate of the i-th initial exploration point.

[0148] The oil ultimate potential rate can be expressed as:

[0149]

[0150] Among them, the P i represents the final potential rate of oil at the i-th initial exploration point.

[0151] The optimal exploration point for the next petroleum geological exploration is determined by selecting each initial exploration point. This determines the ultimate potential oil rate for each initial exploration point, which reflects the abundance of oil resources near each initial exploration point. Therefore, to more effectively discover oil during the subsequent exploration process, the next oil exploration point needs to be selected near an initial exploration point with a higher ultimate potential oil rate. Therefore, when determining the location of the next optimal exploration point, the location of the initial exploration point with a higher ultimate potential oil rate can be assigned a higher weight. Ultimately, the weighted summation is used to calculate the location of a new exploration point.

[0152] This approach not only improves oil exploration efficiency but also effectively reduces unnecessary resource waste. As exploration progresses, data collected from initial exploration points is used to continuously optimize exploration point selection, forming a dynamically adjusted exploration strategy. After each exploration, the strategy can be adjusted based on new data to ensure that exploration points continuously approach areas with the richest oil resources, further improving exploration efficiency.

[0153] Figure 7This is a flow chart of a process for obtaining the coordinates of an optimal exploration point provided by a seventh embodiment of the present invention. The process for obtaining the coordinates of the optimal exploration point includes:

[0154] S701. The final oil potential rate of the i-th initial exploration point is divided by the sum of the final oil potential rates of all the initial exploration points, and then multiplied by the abscissa of the i-th initial exploration point to obtain the abscissa component corresponding to the i-th initial exploration point.

[0155] The horizontal coordinate component corresponding to the initial exploration point can be expressed as:

[0156]

[0157] Among them, the P i represents the final oil potential rate of the i-th initial exploration point, M represents the number of initial exploration points, and x i represents the horizontal coordinate of the i-th initial exploration point, the P b Represents the final potential rate of oil at the bth initial exploration point.

[0158] S702. Repeat the process of obtaining the horizontal coordinate components to obtain the horizontal coordinate components corresponding to the initial exploration points, and add the horizontal coordinate components in sequence to obtain the horizontal coordinate of the optimal exploration point.

[0159] The horizontal coordinate of the optimal exploration point can be expressed as:

[0160]

[0161] S703. The final oil potential rate of the i-th initial exploration point is divided by the sum of the final oil potential rates of all the initial exploration points, and then multiplied by the ordinate of the i-th initial exploration point to obtain the ordinate component corresponding to the i-th initial exploration point.

[0162] The ordinate component corresponding to the initial exploration point can be expressed as:

[0163]

[0164] Among them, the P i represents the final oil potential rate of the i-th initial exploration point, M represents the number of initial exploration points, and y i represents the vertical coordinate of the i-th initial exploration point.

[0165] S704. Repeat the process of obtaining the ordinate components to obtain the ordinate components corresponding to the initial exploration points, and add the ordinate components in sequence to obtain the ordinate of the optimal exploration point.

[0166] The ordinate of the optimal exploration point can be expressed as:

[0167]

[0168] An embodiment of the present invention also provides a data acquisition system for petroleum geological exploration, the system comprising a memory, a processor, and a computer program stored in the memory and running on the processor, wherein the processor implements the steps of the above method when executing the computer program.

[0169] The technical features and technical effects of a data acquisition system for petroleum geological exploration proposed in an embodiment of the present invention are the same as those of the method proposed in an embodiment of the present invention, and are not described in detail here.

[0170] The present invention has the following beneficial effects:

[0171] First, a first number of initial exploration points are determined in the target petroleum geological exploration area, and a second number of surrounding exploration points are determined at a preset distance from the initial exploration point. The initial exploration point and the surrounding exploration points are both basic exploration points and are essential exploration points in petroleum geological exploration.

[0172] Next, a potential coefficient is calculated based on the altitude values of the initial exploration point and the surrounding exploration points. A true availability value is calculated based on the altitude values and gravity values of the initial exploration point and the surrounding exploration points. Finally, an oil potential rate is calculated based on the potential coefficient, the true availability value, and the gravity values of the initial exploration point and the surrounding exploration points. The oil potential rate represents the probability of oil being present near the exploration point. The greater the oil potential rate, the greater the probability of oil being present near the exploration point.

[0173] Then, a correction degree is calculated based on the altitude values of the two selected initial exploration points and the oil potential ratios. A correction value is obtained based on the correction degree and the oil potential ratios of the two initial exploration points corresponding to the correction degree. A final oil potential ratio is obtained based on the correction value and the distance between the two initial exploration points corresponding to the correction value. The final oil potential ratio is the final correction result of the oil potential ratio and more accurately represents the probability of oil presence near the exploration point.

[0174] Finally, the coordinates of the optimal exploration point are obtained based on the final oil potential and the coordinates of the initial exploration point. This optimal exploration point is used as the initial exploration point, and the optimal exploration point acquisition process is repeated to obtain the coordinates of the next optimal exploration point. After obtaining the coordinates of the optimal exploration point, it is added to the initial exploration points, and the coordinates of the next optimal exploration point are then obtained. This cycle repeats. By targetedly deploying exploration points, the system focuses on potential oil-rich areas, significantly improving data acquisition accuracy and effectively reducing exploration costs.

[0175] It should be noted that the order in which the embodiments of the present invention are described above is for illustrative purposes only and does not necessarily represent the superiority or inferiority of the embodiments. The processes depicted in the accompanying drawings do not necessarily require the specific order or sequential order shown to achieve the desired results. In certain embodiments, multitasking and parallel processing are also possible or may be advantageous.

[0176] The various embodiments in this specification are described in a progressive manner, and the same or similar parts between the various embodiments can be referred to each other. Each embodiment focuses on the differences from other embodiments.

Claims

1. A data acquisition method for petroleum geological exploration, characterized in that: The method comprises: Determining an initial exploration point in a petroleum geological exploration target area, and determining surrounding exploration points at preset distances from the initial exploration point; calculating a potential coefficient based on the altitude values of the initial exploration point and the surrounding exploration points, calculating a true availability value based on the altitude values and gravity values of the initial exploration point and the surrounding exploration points, and calculating an oil potential rate based on the potential coefficient, the true availability value, and the gravity values of the initial exploration point and the surrounding exploration points; Calculating a correction degree based on the altitude values of two selected initial exploration points and the oil potential rate, obtaining a correction value based on the correction degree and the oil potential rates of the two initial exploration points corresponding to the correction degree, and obtaining a final oil potential rate based on the correction value and the distance between the two initial exploration points corresponding to the correction value; The coordinates of the optimal exploration point are obtained according to the final oil potential rate and the coordinates of the initial exploration point. The optimal exploration point is used as the initial exploration point, and the optimal exploration point acquisition process is repeated to obtain the coordinates of the next optimal exploration point.

2. The data acquisition method for petroleum geological exploration according to claim 1, characterized in that: The process of obtaining the potential coefficient includes: The altitude value of the initial exploration point and the altitude values of the surrounding exploration points corresponding to the initial exploration point are sequentially added together and then normalized to obtain a first altitude normalized value; The potential coefficient of the initial exploration point is obtained by subtracting the first altitude normalized value from a preset value.

3. The data acquisition method for petroleum geological exploration according to claim 1, characterized in that: The process of obtaining the real availability value includes: subtracting the altitude value of the i-th initial exploration point from the altitude value of the j-th surrounding exploration point corresponding to the i-th initial exploration point, and then performing normalization processing to obtain a second altitude normalized value; subtracting the gravity value of the i-th initial exploration point from the gravity value of the j-th surrounding exploration point corresponding to the i-th initial exploration point, and then performing normalization processing to obtain a gravity normalization value; The second altitude normalized value is subtracted from the gravity normalized value and the negation thereof is taken as the input value of an exponential function with base e, and the output value of the exponential function is used as the true availability value obtained by calculating the oil potential ratio of the j-th surrounding exploration point to the i-th initial exploration point.

4. The data acquisition method for petroleum geological exploration according to claim 1, wherein: The process of obtaining the oil potential rate includes: Subtracting the gravity value of the i-th initial exploration point from the gravity value of the j-th surrounding exploration point corresponding to the i-th initial exploration point, and then multiplying the result by the true availability value obtained by the oil potential rate of the j-th surrounding exploration point to the i-th initial exploration point to obtain a true available gravity value difference between the i-th initial exploration point and the j-th surrounding exploration point; Repeating the process of obtaining the true available gravity value difference component to obtain the true available gravity value difference component when the i-th initial exploration point is compared with each of the corresponding surrounding exploration points; The true available gravity value difference components are sequentially added to obtain the true available gravity value difference, and the normalized value of the true available gravity value difference is multiplied by the potential coefficient of the i-th initial exploration point to obtain the oil potential rate of the i-th initial exploration point.

5. The data acquisition method for petroleum geological exploration according to claim 1, characterized in that: The process of obtaining the correction degree includes: Normalizing the square of the value obtained by subtracting the altitude value of the i-th initial exploration point from the altitude value of the k-th initial exploration point to obtain a third altitude normalized value; Normalizing the absolute value of the oil potential rate at the i-th initial exploration point minus the oil potential rate at the k-th initial exploration point to obtain a normalized oil potential rate value; The absolute value of the difference between the third normalized value of the altitude and the normalized value of the oil potential rate is used as the correction degree of the oil potential rate of the kth initial exploration point to the ith initial exploration point.

6. The data acquisition method for petroleum geological exploration according to claim 1, characterized in that: The process of obtaining the correction value includes: When the oil potential rate of the i-th initial exploration point is less than the oil potential rate of the k-th initial exploration point, the value between the oil potential rate of the k-th initial exploration point and the oil potential rate of the i-th initial exploration point is multiplied by the correction degree of the oil potential rate of the k-th initial exploration point to the i-th initial exploration point, and then added to the oil potential rate of the i-th initial exploration point to obtain the corrected value of the oil potential rate of the k-th initial exploration point to the i-th initial exploration point.

7. The data acquisition method for petroleum geological exploration according to claim 1, characterized in that: The process of obtaining the correction value further includes: When the oil potential rate of the i-th initial exploration point is greater than or equal to the oil potential rate of the k-th initial exploration point, the oil potential rate of the i-th initial exploration point is used as the corrected value after the k-th initial exploration point corrects the oil potential rate of the i-th initial exploration point.

8. The data acquisition method for petroleum geological exploration according to claim 1, wherein: The process of obtaining the oil ultimate potential rate includes: The inverse of the distance between the i-th initial exploration point and the k-th initial exploration point is used as an input value of an exponential function with base e, and the output value of the exponential function is used as a distance component of the k-th initial exploration point relative to the i-th initial exploration point; Repeating the distance component acquisition process to acquire the distance component of each of the initial exploration points relative to the i-th initial exploration point, and sequentially adding the distance components to obtain a sum of the distance components; Dividing the distance component of the kth initial exploration point relative to the ith initial exploration point by the sum of the distance components, and then multiplying the result by the correction value of the oil potential rate of the kth initial exploration point to the ith initial exploration point to obtain a final oil potential rate component of the kth initial exploration point to the ith initial exploration point; Repeat the process of obtaining the final potential rate component of oil to obtain the final potential rate component of oil of each initial exploration point to the i-th initial exploration point, and add the final potential rate components of oil in sequence to obtain the final potential rate of oil of the i-th initial exploration point.

9. The data acquisition method for petroleum geological exploration according to claim 1, wherein: The process of obtaining the coordinates of the optimal exploration point includes: The final oil potential rate of the i-th initial exploration point is divided by the sum of the final oil potential rates of all the initial exploration points, and then multiplied by the abscissa of the i-th initial exploration point to obtain the abscissa component corresponding to the i-th initial exploration point; Repeating the process of obtaining the horizontal coordinate components to obtain the horizontal coordinate components corresponding to each of the initial exploration points, and sequentially adding the horizontal coordinate components to obtain the horizontal coordinate of the optimal exploration point; The final oil potential rate of the i-th initial exploration point is divided by the sum of the final oil potential rates of all the initial exploration points, and then multiplied by the ordinate of the i-th initial exploration point to obtain the ordinate component corresponding to the i-th initial exploration point; The process of obtaining the ordinate components is repeated to obtain the ordinate components corresponding to the initial exploration points, and the ordinate components are sequentially added to obtain the ordinate of the optimal exploration point.

10. A data acquisition system for petroleum geological exploration, the system comprising a memory, a processor, and a computer program stored in the memory and running on the processor, characterized in that: When the processor executes the computer program, the steps of the method according to any one of claims 1 to 9 are implemented.

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