Oil-mixed shale oil quantitative evaluation pyrolysis parameter correction method and device

Abstract

This application discloses a method and apparatus for quantitative evaluation and correction of pyrolysis parameters in shale oil under mixed oil conditions, comprising: collecting source rock pyrolysis parameter data from the target window of the pilot well and horizontal wells, including the amount of kerogen cracking hydrocarbons S in the target window of the pilot well. 2导眼 kerogen cracking hydrocarbon content S in horizontal wells 2水平 ; respectively for S 2导眼 and S 2水平 Sort and segment; establish S 2导眼 and S 2水平 The relationship between them, the piecewise fitting formula, and the S 2水平 The correction formula for S; 2水平 Correction is performed according to segmented intervals to obtain the corrected S. 2校正 The relationship between the target window of the pilot well and the remaining pyrolysis parameters of the horizontal well is established sequentially according to segmented intervals, and the correction formulas for the remaining pyrolysis parameters of the horizontal well are obtained sequentially. The remaining pyrolysis parameters are then corrected according to segmented intervals, and derived parameters are calculated. This method can recover pyrolysis parameters affected by oil mixing, obtain accurate pyrolysis analysis data, and provide technical support for the quantitative evaluation of shale oil.

Description

Technical Field

[0001] This invention relates to the field of oilfield exploration and development technology, and in particular to a method and apparatus for quantitative evaluation and correction of pyrolysis parameters of shale oil under mixed oil conditions. Background Technology

[0002] With the increasing intensity of exploration and development, short-radius horizontal wells, windowed sidetracking, and extended reach horizontal wells have been widely used. To accelerate drilling speed, increase drilling machine rate of penetration, enhance drilling fluid lubrication, and reduce frictional resistance and drill string torque between the drill string and the wellbore and casing walls, it is necessary to switch to a mixed oil drilling fluid system in deviated well sections. This also significantly impacts geological logging operations.

[0003] In shale oil resource evaluation, organic matter abundance is a crucial indicator for assessing its exploitation value, as it determines the hydrocarbon content of shale oil. Pyrolysis parameters and derived parameters from rock pyrolysis logging can be used for timely and effective evaluation of organic matter abundance during drilling. However, oil-based drilling fluids primarily affect the peak value of free hydrocarbons (S1), thus impacting the accuracy of derived parameters such as production potential (Pg), available carbon (Pc), and total organic carbon (TOC), failing to meet the requirements of shale oil resource evaluation.

[0004] Therefore, how to address the impact of oil mixing conditions on geochemical pyrolysis parameters in order to assist in the resource evaluation of shale oil is a technical problem that urgently needs to be solved by those skilled in the art. Summary of the Invention

[0005] In view of this, the purpose of the present invention is to provide a method and apparatus for quantitative evaluation and correction of pyrolysis parameters of shale oil under mixed oil conditions, which can recover data of pyrolysis parameters of horizontal wells under mixed oil conditions.

[0006] The specific plan is as follows:

[0007] A method for quantitative evaluation and correction of pyrolysis parameters in shale oil under mixed oil conditions, comprising:

[0008] Collect source rock pyrolysis parameter data for pilot well target windows and horizontal wells, including kerogen cracking hydrocarbon content S in pilot well target windows. 2导眼 kerogen cracking hydrocarbon content S in horizontal wells 2水平 ;

[0009] The amount of hydrocarbons S cracked from the kerogen were respectively... 2导眼 and the amount of hydrocarbons S cracked from kerogen 2水平 Perform sorting and segmentation;

[0010] Establish the amount of hydrocarbons S from kerogen cracking 2导眼 and the amount of hydrocarbons S cracked from kerogen 2水平 The relationship between the two factors is used to obtain the amount of hydrocarbons S from kerogen cracking using a piecewise fitting formula.2水平 The correction formula;

[0011] The obtained correction formula was used to adjust the amount of hydrocarbons S cracked from the kerogen. 2水平 The correction is performed according to the segmented intervals to obtain the corrected parameter S. 2校正 ;

[0012] The relationship between the remaining source rock pyrolysis parameters of the pilot well target window and the remaining pyrolysis parameters of the corresponding horizontal well is established sequentially according to the segmented intervals, and the correction formulas for the remaining pyrolysis parameters of the horizontal well are obtained sequentially.

[0013] The remaining pyrolysis parameters of the horizontal well are corrected according to the segmented intervals using the successively obtained correction formulas, and the derived parameters are calculated.

[0014] Preferably, in the above-mentioned method for quantitative evaluation and correction of pyrolysis parameters of shale oil under mixed oil conditions provided in the embodiments of the present invention, the amount of hydrocarbons S cracked from kerogen is respectively... 2导眼 and the amount of hydrocarbons S cracked from kerogen 2水平 Sort and segment, including:

[0015] The amount of hydrocarbons S cracked from the kerogen were respectively... 2导眼 and the amount of kerogen-cracked hydrocarbons S 2水平 Sort;

[0016] The amount of hydrocarbons from the kerogen cracking S 2导眼 The segments are divided according to the set rules to obtain segmented intervals.

[0017] The amount of hydrocarbons from the kerogen cracking S 2水平 Divide into segments according to the corresponding segment intervals.

[0018] Preferably, in the above-described method for quantitative evaluation and correction of pyrolysis parameters of shale oil under mixed oil conditions provided in this embodiment of the invention, the amount of kerogen cracking hydrocarbons S is... 2导眼 The segments are divided according to the set rules to obtain segmented intervals, including:

[0019] The amount of hydrocarbons from the kerogen cracking S 2导眼 Divide it into two segments to obtain two segmented intervals;

[0020] The amount of hydrocarbons from the kerogen cracking S 2水平 Segmentation is based on the corresponding segment intervals, including:

[0021] The amount of hydrocarbons from the kerogen cracking S 2水平 Divide the segmented intervals into two equal segments and obtain the dividing points between the two segments.

[0022] Preferably, in the above-described method for quantitative evaluation and correction of pyrolysis parameters of shale oil under mixed oil conditions provided in this embodiment of the invention, the amount of kerogen cracking hydrocarbons S is obtained.2水平 The correction formulas include:

[0023] When the amount of hydrocarbons cracked from the kerogen is S 2水平 When the value is less than the obtained boundary point, the amount of kerogen cracked hydrocarbons S is obtained. 2水平 The first correction formula;

[0024] When the amount of hydrocarbons cracked from the kerogen is S 2水平 When the value is greater than the obtained boundary point, the amount of kerogen cracked hydrocarbons S is obtained. 2水平 The second correction formula.

[0025] Preferably, in the above-described method for quantitative evaluation of shale oil pyrolysis parameters under mixed oil conditions provided in this embodiment of the invention, the correction formulas for the remaining pyrolysis parameters of the horizontal well are obtained sequentially, including:

[0026] The amount of free hydrocarbons S in the horizontal well is obtained sequentially. 1水平 The correction formula, residual organic carbon content S 4水平 The correction formula and the peak temperature T of the cracked hydrocarbon max水平 The correction formula.

[0027] Preferably, in the above-described method for quantitative evaluation of pyrolysis parameters of shale oil under mixed oil conditions provided in this embodiment of the invention, the calculation of derived parameters includes:

[0028] Based on all corrected pyrolysis parameters, the oil production potential (Pg), available carbon (PC), and total organic carbon (TOC) were calculated respectively.

[0029] Preferably, in the above-mentioned method for quantitative evaluation and correction of pyrolysis parameters of shale oil under mixed oil conditions provided in the embodiments of the present invention, the source rock pyrolysis parameter data of the pilot well target window is the analysis data of logging under water-based drilling fluid conditions;

[0030] The source rock pyrolysis parameter data of the horizontal well are analysis data obtained from well logging under oil-based drilling fluid conditions.

[0031] This invention also provides a device for quantitatively evaluating pyrolysis parameters of shale oil under mixed oil conditions, comprising:

[0032] The data collection module is used to collect source rock pyrolysis parameter data from the pilot well target window and horizontal wells, including the amount of kerogen cracking hydrocarbons S in the pilot well target window. 2导眼 kerogen cracking hydrocarbon content S in horizontal wells 2水平 ;

[0033] The sorting and segmentation module is used to sort the amount of hydrocarbons S cracked from kerogen. 2导眼 and the amount of hydrocarbons S cracked from kerogen 2水平 Perform sorting and segmentation;

[0034] The formula fitting module is used to establish the amount of hydrocarbons S cracked from kerogen. 2导眼 and the amount of hydrocarbons S cracked from kerogen 2水平 The relationship between the two factors is used to obtain the amount of hydrocarbons S from kerogen cracking using a piecewise fitting formula. 2水平 The correction formula;

[0035] The parameter correction module is used to adjust the amount of hydrocarbons S cracked from kerogen using the obtained correction formula. 2水平 The correction is performed according to the segmented intervals to obtain the corrected parameter S. 2校正 ;

[0036] The formula fitting module is also used to establish the relationship between the remaining source rock pyrolysis parameters of the pilot well target window and the remaining pyrolysis parameters of the corresponding horizontal well in a segmented interval, and to obtain the correction formulas for the remaining pyrolysis parameters of the horizontal well in a sequential manner.

[0037] The parameter correction module is also used to correct the remaining pyrolysis parameters of the horizontal well according to the segmented intervals using the successively obtained correction formulas, and to calculate the derived parameters.

[0038] Preferably, in the shale oil quantitative evaluation pyrolysis parameter correction device under mixed oil conditions provided in the embodiments of the present invention, the sorting and segmentation module is specifically used to separately process the amount of kerogen cracking hydrocarbons S. 2导眼 and the amount of kerogen-cracked hydrocarbons S 2水平 Sort; determine the amount of hydrocarbons S from kerogen cracking. 2导眼 The segments are divided according to the set rules to obtain segmented intervals; the amount of kerogen cracked hydrocarbons S is then... 2水平 Divide into segments according to the corresponding segment intervals.

[0039] Preferably, in the shale oil quantitative evaluation pyrolysis parameter correction device under mixed oil conditions provided in the embodiments of the present invention, the formula fitting module is specifically used to sequentially establish the relationship between the remaining source rock pyrolysis parameters of the pilot well target window and the remaining pyrolysis parameters of the corresponding horizontal well according to segmented intervals, fit the formula, and sequentially obtain the free hydrocarbon content S of the horizontal well. 1水平 The correction formula, residual organic carbon content S 4水平 The correction formula and the peak temperature T of the cracked hydrocarbon max水平 The correction formula.

[0040] As can be seen from the above technical solution, the present invention provides a method for quantitative evaluation and correction of pyrolysis parameters of shale oil under mixed oil conditions, comprising: collecting source rock pyrolysis parameter data of pilot well target windows and horizontal wells, including the amount of kerogen cracking hydrocarbons S in the pilot well target windows. 2导眼 kerogen cracking hydrocarbon content S in horizontal wells 2水平 ; respectively, the amount of hydrocarbons S cracked from kerogen 2导眼 and the amount of hydrocarbons cracked from kerogen S2水平 Sort and segment; establish the amount of hydrocarbons S from kerogen cracking. 2导眼 and the amount of hydrocarbons cracked from kerogen S 2水平 The relationship between the two factors is used to obtain the amount of hydrocarbons S from kerogen cracking using a piecewise fitting formula. 2水平 The correction formula; using the obtained correction formula to adjust the amount of hydrocarbons S cracked from kerogen. 2水平 The correction is performed according to the segmented intervals to obtain the corrected parameter S. 2校正 The relationship between the remaining source rock pyrolysis parameters of the pilot well target window and the remaining pyrolysis parameters of the corresponding horizontal well is established sequentially according to the segmented intervals. The correction formulas for the remaining pyrolysis parameters of the horizontal well are obtained sequentially. The remaining pyrolysis parameters of the horizontal well are corrected according to the segmented intervals using the successively obtained correction formulas, and the derived parameters are calculated.

[0041] The pyrolysis parameter correction method for quantitative evaluation of shale oil under mixed oil conditions provided by this invention first uses the target window data of the pilot well to segment and correct the pyrolysis parameter S2, which has a relatively small impact on the horizontal well. Then, it corrects the remaining pyrolysis parameters segment by segment, thereby restoring the pyrolysis parameters under mixed oil conditions, eliminating the influence of mixed oil, and obtaining accurate source rock pyrolysis analysis data. This provides technical support for the quantitative evaluation of shale oil and has broad application prospects.

[0042] Furthermore, this invention also provides a corresponding device for the quantitative evaluation and pyrolysis parameter correction method of shale oil under mixed oil conditions, which further makes the above method more practical, and the device has corresponding advantages. Attached Figure Description

[0043] To more clearly illustrate the technical solutions in the embodiments of the present invention or related technologies, the drawings used in the description of the embodiments or related technologies will be briefly introduced below. Obviously, the drawings described below are only embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on the provided drawings without creative effort.

[0044] Figure 1 A flowchart of a method for quantitative evaluation and pyrolysis parameter correction of shale oil under mixed oil conditions provided in an embodiment of the present invention;

[0045] Figure 2 Correlation analysis diagram of pyrolysis parameters S1 and S2 of the target window in the guide hole provided in this embodiment of the invention;

[0046] Figure 3 This is a segmented correlation analysis diagram of the pyrolysis parameters S1 and S2 of the pilot hole target window provided in an embodiment of the present invention;

[0047] Figure 4 This is a segmented correlation analysis diagram of horizontal well pyrolysis parameters S1 and S2 provided in an embodiment of the present invention;

[0048] Figure 5 This is a calibration fitting diagram of the pyrolysis parameter S2 provided in an embodiment of the present invention;

[0049] Figure 6 This is a calibration fitting diagram of the pyrolysis parameter S1 provided in an embodiment of the present invention;

[0050] Figure 7 The pyrolysis parameter S4 correction fitting diagram provided in the embodiment of the present invention;

[0051] Figure 8 This is a corrected shale oil pyrolysis geochemical evaluation diagram provided in an embodiment of the present invention;

[0052] Figure 9 This is a schematic diagram of the structure of the pyrolysis parameter correction device for quantitative evaluation of shale oil under mixed oil conditions provided in an embodiment of the present invention. Detailed Implementation

[0053] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0054] This invention provides a method for quantitatively evaluating and correcting pyrolysis parameters of shale oil under mixed oil conditions, such as... Figure 1 As shown, it includes the following steps:

[0055] S101. Collect source rock pyrolysis parameter data for the pilot well target window and horizontal well, including the amount of kerogen cracking hydrocarbons S in the pilot well target window. 2导眼 kerogen cracking hydrocarbon content S in horizontal wells 2水平 ;

[0056] It should be noted that the pyrolysis parameter data collected by this invention may include the amount of gaseous hydrocarbons S in the target window of the pilot well. 0导眼 Free hydrocarbon content S 1导眼 , kerogen cracking hydrocarbon content S 2导眼 Residual organic carbon content S 4导眼 , peak temperature of cracked hydrocarbons T max导眼 Gas hydrocarbon quantity S in horizontal wells 0水平 Free hydrocarbon content S 1水平 , kerogen cracking hydrocarbon content S 2水平 Residual organic carbon content S 4水平 , peak temperature of cracked hydrocarbons T max水平 That is, when performing step S101, the pyrolysis parameters S of the pilot hole target window need to be collected. 0导眼 S 1导眼S 2导眼 S 4导眼 T max导眼 And the pyrolysis parameter S of the horizontal well. 0水平 S 1水平 S 2水平 S 4水平 T max水平 These parameters, such as those from the source rock pyrolysis, are used to evaluate the oil content and movable oil content of shale oil. If there is no pilot well, pyrolysis analysis data from the same stratum in adjacent wells in the same well area can be used as a reference.

[0057] In practice, the source rock pyrolysis parameter data of the pilot well target window can be the analysis data of logging under water-based drilling fluid conditions. It is not affected by pollution and other factors, and is the real data of the source rock. The source rock pyrolysis parameter data of the horizontal well is the analysis data of logging under oil-based drilling fluid conditions, and differs greatly from the source rock pyrolysis parameters of the pilot well target window.

[0058] S102, respectively, regarding the amount of hydrocarbons cracked from kerogen S 2导眼 and the amount of hydrocarbons cracked from kerogen S 2水平 Perform sorting and segmentation;

[0059] It should be noted that oil-based drilling fluids have a relatively small impact on the amount of kerogen cracked hydrocarbons S2. Therefore, this invention uses pilot well target window data to preferentially correct the amount of kerogen cracked hydrocarbons S2 and process it in segments according to its intervals to solve the problem of reservoir oil content identification.

[0060] S103, Establish the amount of hydrocarbons from kerogen cracking S 2导眼 and the amount of hydrocarbons cracked from kerogen S 2水平 The relationship between the two factors is used to obtain the amount of hydrocarbons S from kerogen cracking using a piecewise fitting formula. 2水平 The correction formula;

[0061] S104. Using the obtained correction formula, adjust the amount of hydrocarbons cracked from kerogen, S. 2水平 The correction is performed according to the segmented intervals to obtain the corrected parameter S. 2校正 ;

[0062] S105. Establish the relationship between the remaining source rock pyrolysis parameters of the pilot well target window and the remaining pyrolysis parameters of the corresponding horizontal well in sequence according to the segmented intervals, and obtain the correction formulas for the remaining pyrolysis parameters of the horizontal well in sequence.

[0063] In practical applications, other source rock pyrolysis parameters refer to parameters other than the amount of hydrocarbons cracked from kerogen in the collected pyrolysis parameter data. Specifically, these can include the pyrolysis parameter S of the target window in the pilot well. 1导眼 S 4导眼 T max导眼 And the pyrolysis parameter S of the horizontal well. 1水平 S4水平 T max水平 wait.

[0064] S106. Using the successively obtained correction formulas, correct the remaining pyrolysis parameters of the horizontal well according to the segmented intervals, and calculate the derived parameters.

[0065] In the above-mentioned method for correcting pyrolysis parameters for quantitative evaluation of shale oil under mixed oil conditions provided in this embodiment of the invention, the pyrolysis parameter S2, which has a relatively small impact on the horizontal well, is first corrected by segmenting the target window data of the pilot well. Then, the remaining pyrolysis parameters are corrected segment by segment, thereby restoring the pyrolysis parameters under mixed oil conditions, eliminating the influence of mixed oil, and obtaining accurate source rock pyrolysis analysis data. This provides technical support for the quantitative evaluation of shale oil and has broad application prospects.

[0066] In specific implementation, in the above-mentioned method for quantitative evaluation and correction of pyrolysis parameters of shale oil under mixed oil conditions provided in the embodiments of the present invention, step S102 respectively adjusts the amount of hydrocarbons S cracked from kerogen. 2导眼 and the amount of hydrocarbons cracked from kerogen S 2水平 Sorting and segmenting can include: sorting the amount of hydrocarbons S cracked from kerogen. 2导眼 and the amount of kerogen cracked hydrocarbons S 2水平 Sort; determine the amount of hydrocarbons S from kerogen cracking. 2导眼 The segments are divided according to the set rules to obtain segmented intervals; the amount of hydrocarbons S from kerogen cracking is then calculated. 2水平 Divide into segments according to the corresponding segment intervals.

[0067] like Figure 2 As shown, based on the data analysis of the target window of the pilot well in the example well, the free hydrocarbon content S1 and the kerogen cracking hydrocarbon content S2 have a poor correlation, but S1 generally shows an increasing trend as S2 increases.

[0068] The following table, with reference to Table 1, lists the source rock pyrolysis parameters for the target window of the pilot well:

[0069] Table 1. Pyrolysis Parameter Data for the Target Window of the Guide Well

[0070] well deep category <![CDATA[S0]]> <![CDATA[S1]]> <![CDATA[S2]]> <![CDATA[T max ]]> PG <![CDATA[S4]]> TOC <![CDATA[S1 / TOC]]> 4214 shavings 0.00 1.63 7.46 450 9.10 39.16 4.28 0.38 4216 shavings 0.00 1.40 6.76 449 8.16 34.66 3.80 0.37 4218 shavings 0.01 2.81 8.40 443 11.22 48.76 5.32 0.53 4224 shavings 0.01 2.32 8.67 453 11.00 45.14 4.98 0.47 4222 shavings 0.03 2.23 12.67 448 14.94 49.79 5.72 0.39 4226 shavings 0.00 2.32 11.89 450 14.21 44.82 5.21 0.44 4228 shavings 0.02 2.67 15.06 458 17.75 61.58 7.01 0.38

[0071] From the S2 data of the pilot hole target window in Table 1, the data can be clearly divided into two segments. To make the data correction more accurate, the S2 data of the pilot hole target window and the S2 data of the horizontal well can be sorted first. Then, based on the data, the corresponding S2 data of the pilot hole target window and the S2 data of the horizontal well can be divided into two segments.

[0072] Therefore, in specific implementation, in the above-mentioned method for quantitative evaluation and correction of pyrolysis parameters of shale oil under mixed oil conditions provided in the embodiments of the present invention, the amount of kerogen cracking hydrocarbons S in the above steps is adjusted. 2导眼The segments are divided according to the set rules to obtain segmented intervals, and the amount of hydrocarbons S from kerogen cracking is recorded. 2水平 Divide the data into segments according to the corresponding intervals. Specifically, this may include: First, the amount of hydrocarbons S cracked from kerogen. 2导眼 The mixture was divided into two segments, resulting in two segmented intervals; then, the amount of hydrocarbons S from kerogen cracking was... 2水平 Divide the segmented intervals into two equal segments and obtain the dividing points between the two segments.

[0073] like Figure 3 As shown, the S2 data of the guide hole target window is divided into two segments with 10 mg / g as the dividing point. After dividing into two segments, the correlation between S1 and S2 is significantly improved. Figure 4 As shown, the S2 data of the horizontal well corresponding to the target window of the pilot hole is divided into two segments at 11.6 mg / g.

[0074] In specific implementation, in the above-mentioned method for quantitative evaluation and correction of pyrolysis parameters of shale oil under mixed oil conditions provided in the embodiments of the present invention, the amount of kerogen cracking hydrocarbons S is obtained. 2水平 The correction formula includes: when the amount of hydrocarbons cracked by kerogen S 2水平 When the value is less than the obtained cutoff point, the amount of hydrocarbons S obtained from kerogen cracking is calculated. 2水平 The first correction formula; when the amount of hydrocarbons cracked by kerogen S 2水平 When the value is greater than the obtained cutoff point, the amount of hydrocarbons S obtained from kerogen cracking is calculated. 2水平 The second correction formula.

[0075] like Figure 5 As shown, the S2 data of the pilot well target window is divided into two segments with different slopes. The S2 data of the horizontal well is also correspondingly divided into two segments. According to... Figure 5 The S2 data of the pilot hole target window and the S2 data of the horizontal well are shown. The relationship is established in two segments. The S2 data of the horizontal well and the S2 data of the pilot hole target window are fitted with formulas to obtain the correction formulas for the two segments.

[0076] When S2 in the horizontal well is less than 11.6 mg / g, its relationship with the target window S2 in the pilot hole is established, and the first correction formula is as follows:

[0077] From 10.084S 2校正 -63.41 = 7.4427S 2水平 -61.844 yields:

[0078] S 2校正 =0.738×S 2水平 +0.155;

[0079] When the horizontal well S2 > 11.6 mg / g, a relationship is established between it and the target window S2 of the pilot hole, resulting in the following second correction formula:

[0080] From 4.9961S2校正 -23.643 = 4.7429S 2水平 -26.393 yields:

[0081] S 2校正 =0.949×S 2水平 -0.55.

[0082] Using the first and second correction formulas mentioned above, the horizontal well S2 can be corrected according to segmented intervals to obtain the corrected S2 value.

[0083] In specific implementation, in the above-mentioned method for quantitative evaluation of pyrolysis parameters of shale oil under mixed oil conditions provided in this embodiment of the invention, step S105 sequentially obtains the correction formulas for the remaining pyrolysis parameters of the horizontal well, including: sequentially obtaining the free hydrocarbon content S of the horizontal well. 1水平 The correction formula, residual organic carbon content S 4水平 The correction formula and the peak temperature T of the cracked hydrocarbon max水平 The correction formula.

[0084] Specifically, during step S105, the remaining analytical data of the source rock in the pilot hole target window, including the pyrolysis parameter S, can be segmented according to the interval of S2. 1导眼 S 4导眼 T max导眼 etc., and the corresponding analytical data S of horizontal wells 1水平 S 4水平 T max水平 By establishing the relationships separately and fitting the formula, the pyrolysis parameter S is obtained. 1水平 S 4水平 T max水平 Correction formulas for key parameters.

[0085] like Figure 6 and Figure 7 As shown, the target window of the pilot hole can be connected to the horizontal well S 1水平 S 4水平 The data is divided into two segments according to the segmented interval of S2 to establish a relationship. The horizontal well and the pilot well S1 and S4 are fitted with formulas to obtain the correction formulas for the two segments respectively.

[0086] Based on the range of S2 < 11.6 mg / g in horizontal wells, the relationship between S1 data and S1 target window data in guide holes, and the relationship between S4 data and S4 target window data in horizontal wells, are established, resulting in the following correction formula:

[0087] S 1校正 =0.047×S 1水平 +1.097;

[0088] S 4校正 =1.258×S 4水平-1.568;

[0089] Based on the range where S2 in horizontal wells > 11.6 mg / g, the relationship between S1 data in horizontal wells and S1 data in the target window of the guide hole is established, and the relationship between S4 data in horizontal wells and S4 data in the target window of the guide hole is established, resulting in the following correction formula:

[0090] S 1校正 =0.011×S 1水平 +2.074;

[0091] S 4校正 =1.517×S 1水平 -12.361.

[0092] In specific implementation, in the above-mentioned method for quantitative evaluation of shale oil pyrolysis parameters under mixed oil conditions provided in the embodiments of the present invention, step S106 calculates the derived parameters, which may specifically include: calculating the oil production potential Pg, effective carbon PC, and total organic carbon TOC based on all corrected pyrolysis parameters.

[0093] Specifically, the above correction formula is used to adjust the S of the horizontal well. 1水平 S 4水平 Correction is performed according to segmented intervals to obtain the corrected recovery value.

[0094] The following table, with reference to Table 2, lists the source rock pyrolysis parameters and corrected parameters for horizontal wells:

[0095] Table 2. Partial Pyrolysis Parameter Data for Horizontal Well Sections

[0096]

[0097]

[0098] Based on the corrected pyrolysis parameter S 1校正 S 2校正 S 4校正 This allows for the calculation of oil production potential (Pg), available carbon (PC), total organic carbon (TOC), etc., ultimately forming a shale oil pyrolysis geochemical evaluation map. (See...) Figure 8 .

[0099] The above process and methods can quickly correct the pyrolysis parameters for quantitative evaluation of shale oil under mixed oil conditions, which can guide the quantitative evaluation of shale oil resources and has broad application prospects.

[0100] Based on the same inventive concept, this invention also provides a device for correcting pyrolysis parameters for quantitative evaluation of shale oil under mixed oil conditions. Since the principle of this device in solving the problem is similar to the aforementioned method for correcting pyrolysis parameters for quantitative evaluation of shale oil under mixed oil conditions, the implementation of this device can refer to the implementation of the method for correcting pyrolysis parameters for quantitative evaluation of shale oil under mixed oil conditions, and the repeated parts will not be described again.

[0101] In specific implementation, the pyrolysis parameter correction device for quantitative evaluation of shale oil under mixed oil conditions provided in this embodiment of the invention, such as... Figure 9 As shown, it specifically includes:

[0102] Data collection module 11 is used to collect source rock pyrolysis parameter data for the pilot well target window and horizontal well, including the amount of kerogen cracking hydrocarbons S in the pilot well target window. 2导眼 kerogen cracking hydrocarbon content S in horizontal wells 2水平 ;

[0103] The sorting and segmentation module 12 is used to sort the amount of hydrocarbons S cracked from kerogen. 2导眼 and the amount of hydrocarbons cracked from kerogen S 2水平 Perform sorting and segmentation;

[0104] Formula fitting module 13 is used to establish the amount of hydrocarbons S from kerogen cracking. 2导眼 and the amount of hydrocarbons cracked from kerogen S 2水平 The relationship between the two factors is used to obtain the amount of hydrocarbons S from kerogen cracking using a piecewise fitting formula. 2水平 The correction formula is also used to establish the relationship between the remaining source rock pyrolysis parameters of the pilot well target window and the remaining pyrolysis parameters of the corresponding horizontal well in a segmented interval, and to obtain the correction formulas for the remaining pyrolysis parameters of the horizontal well in a sequential manner.

[0105] Parameter correction module 14 is used to adjust the amount of hydrocarbons S cracked by kerogen using the obtained correction formula. 2水平 The correction is performed according to the segmented intervals to obtain the corrected parameter S. 2校正 It is also used to correct the remaining pyrolysis parameters of the horizontal well according to the segmented intervals using the successively obtained correction formulas, and to calculate the derived parameters.

[0106] In the pyrolysis parameter correction device for quantitative evaluation of shale oil under mixed oil conditions provided in the embodiments of the present invention, the pyrolysis parameters under mixed oil conditions can be restored through the interaction of the above four modules, the influence of mixed oil can be eliminated, and accurate source rock pyrolysis analysis data can be obtained, providing technical support for quantitative evaluation of shale oil and having broad application prospects.

[0107] In specific implementation, in the shale oil quantitative evaluation pyrolysis parameter correction device under mixed oil conditions provided in the embodiments of the present invention, the sorting and segmentation module 12 is specifically used to separately measure the amount of kerogen cracking hydrocarbons S. 2导眼and the amount of kerogen cracked hydrocarbons S 2水平 Sort; determine the amount of hydrocarbons S from kerogen cracking. 2导眼 The segments are divided according to the set rules to obtain segmented intervals; the amount of hydrocarbons S from kerogen cracking is then calculated. 2水平 Divide into segments according to the corresponding segment intervals.

[0108] In specific implementation, in the shale oil quantitative evaluation pyrolysis parameter correction device under mixed oil conditions provided in the embodiments of the present invention, the formula fitting module 13 is specifically used to establish the relationship between the remaining source rock pyrolysis parameters of the pilot well target window and the remaining pyrolysis parameters of the corresponding horizontal well according to the segmented intervals, fit the formula, and sequentially obtain the free hydrocarbon content S of the horizontal well. 1水平 The correction formula, residual organic carbon content S 4水平 The correction formula and the peak temperature T of the cracked hydrocarbon max水平 The correction formula.

[0109] For more detailed information on the working process of each of the above modules, please refer to the relevant content disclosed in the foregoing embodiments, which will not be repeated here.

[0110] Accordingly, this invention also discloses a device for correcting pyrolysis parameters for quantitative evaluation of shale oil under mixed oil conditions, comprising a processor and a memory; wherein, when the processor executes the computer program stored in the memory, it implements the method for correcting pyrolysis parameters for quantitative evaluation of shale oil under mixed oil conditions disclosed in the aforementioned embodiments.

[0111] For more detailed information on the above methods, please refer to the relevant content disclosed in the foregoing embodiments, which will not be repeated here.

[0112] Furthermore, the present invention also discloses a computer-readable storage medium for storing a computer program; when the computer program is executed by a processor, it implements the aforementioned method for quantitative evaluation and correction of pyrolysis parameters of shale oil under mixed oil conditions.

[0113] For more detailed information on the above methods, please refer to the relevant content disclosed in the foregoing embodiments, which will not be repeated here.

[0114] The various embodiments in this specification are described in a progressive manner, with each embodiment focusing on its differences from other embodiments. Similar or identical parts between embodiments can be referred to interchangeably. For the apparatuses, devices, and storage media disclosed in the embodiments, since they correspond to the methods disclosed in the embodiments, the descriptions are relatively simple; relevant parts can be referred to the method section.

[0115] Those skilled in the art will further recognize that the units and algorithm steps of the various examples described in conjunction with the embodiments disclosed herein can be implemented in electronic hardware, computer software, or a combination of both. To clearly illustrate the interchangeability of hardware and software, the components and steps of the various examples have been generally described in terms of functionality in the foregoing description. Whether these functions are implemented in hardware or software depends on the specific application and design constraints of the technical solution. Those skilled in the art can use different methods to implement the described functions for each specific application, but such implementation should not be considered beyond the scope of this application.

[0116] The steps of the methods or algorithms described in conjunction with the embodiments disclosed herein can be implemented directly by hardware, a software module executed by a processor, or a combination of both. The software module can be located in random access memory (RAM), main memory, read-only memory (ROM), electrically programmable ROM, electrically erasable programmable ROM, registers, hard disk, removable disk, CD-ROM, or any other form of storage medium known in the art.

[0117] In summary, the present invention provides a method for quantitative evaluation and correction of pyrolysis parameters for shale oil under mixed oil conditions, comprising: collecting source rock pyrolysis parameter data from the target window of the pilot well and horizontal wells, including the amount of kerogen cracking hydrocarbons S in the target window of the pilot well. 2导眼 kerogen cracking hydrocarbon content S in horizontal wells 2水平 ; respectively, the amount of hydrocarbons S cracked from kerogen 2导眼 and the amount of hydrocarbons cracked from kerogen S 2水平 Sort and segment; establish the amount of hydrocarbons S from kerogen cracking. 2导眼 and the amount of hydrocarbons cracked from kerogen S 2水平 The relationship between the two factors is used to obtain the amount of hydrocarbons S from kerogen cracking using a piecewise fitting formula. 2水平 The correction formula; using the obtained correction formula to adjust the amount of hydrocarbons S cracked from kerogen. 2水平 The correction is performed according to the segmented intervals to obtain the corrected parameter S. 2校正The method establishes the relationship between the remaining source rock pyrolysis parameters of the pilot well target window and the remaining pyrolysis parameters of the corresponding horizontal wells according to segmented intervals, and obtains the correction formulas for the remaining pyrolysis parameters of the horizontal wells in sequence. Using these correction formulas, the remaining pyrolysis parameters of the horizontal wells are corrected according to segmented intervals, and derived parameters are calculated. This method first uses the pilot well target window data to segment and correct the pyrolysis parameter S2, which has a relatively small impact on the horizontal well. Then, it corrects the remaining pyrolysis parameters segment by segment, thereby recovering the pyrolysis parameters under mixed oil conditions, eliminating the influence of mixed oil, and obtaining accurate source rock pyrolysis analysis data. This provides technical support for the quantitative evaluation of shale oil and has broad application prospects. Furthermore, this invention also provides a corresponding device for the pyrolysis parameter correction method for quantitative evaluation of shale oil under mixed oil conditions, further enhancing the practicality of the above method. This device has corresponding advantages.

[0118] Finally, it should be noted that in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0119] The above provides a detailed description of the method and apparatus for quantitative evaluation and correction of pyrolysis parameters of shale oil under mixed oil conditions provided by the present invention. Specific examples have been used to illustrate the principle and implementation of the present invention. The description of the above embodiments is only for the purpose of helping to understand the method and core idea of ​​the present invention. At the same time, for those skilled in the art, there will be changes in the specific implementation and application scope based on the idea of ​​the present invention. Therefore, the content of this specification should not be construed as a limitation of the present invention.

Claims

1. A method for quantitatively evaluating and correcting pyrolysis parameters of shale oil under mixed oil conditions, characterized in that, include: Collect source rock pyrolysis parameter data for pilot well target windows and horizontal wells, including kerogen cracking hydrocarbon content S in pilot well target windows. 2导眼 kerogen cracking hydrocarbon content S in horizontal wells 2水平 ; The amount of hydrocarbons S cracked from the kerogen were respectively... 2导眼 and the amount of hydrocarbons S cracked from kerogen 2水平 Sort; The amount of hydrocarbons from the kerogen cracking S 2导眼 The segments are divided according to the set rules to obtain segmented intervals. The amount of hydrocarbons from the kerogen cracking S 2水平 Divide into segments according to the corresponding segment intervals; Establish the amount of hydrocarbons S from kerogen cracking 2导眼 and the amount of hydrocarbons S cracked from kerogen 2水平 The relationship between the two factors is used to obtain the amount of hydrocarbons S from kerogen cracking using a piecewise fitting formula. 2水平 The correction formula; The obtained correction formula was used to adjust the amount of hydrocarbons S cracked from the kerogen. 2水平 The correction is performed according to the segmented intervals to obtain the corrected parameter S. 2校正 ; The relationship between the remaining source rock pyrolysis parameters of the pilot well target window and the remaining pyrolysis parameters of the corresponding horizontal well is established sequentially according to the segmented intervals, and the correction formulas for the remaining pyrolysis parameters of the horizontal well are obtained sequentially. The remaining pyrolysis parameters of the horizontal well are corrected according to the segmented intervals using the successively obtained correction formulas, and the derived parameters are calculated.

2. The method for quantitative evaluation and correction of pyrolysis parameters of shale oil under mixed oil conditions according to claim 1, characterized in that, The amount of hydrocarbons from the kerogen cracking S 2导眼 The segments are divided according to the set rules to obtain segmented intervals, including: The amount of hydrocarbons from the kerogen cracking S 2导眼 Divide it into two segments to obtain two segmented intervals; The amount of hydrocarbons from the kerogen cracking S 2水平 Segmentation is based on the corresponding segment intervals, including: The amount of hydrocarbons from the kerogen cracking S 2水平 Divide the segmented intervals into two equal segments and obtain the dividing points between the two segments.

3. The method for quantitative evaluation and correction of pyrolysis parameters of shale oil under mixed oil conditions according to claim 2, characterized in that, Obtain the amount of hydrocarbons S from the kerogen cracking 2水平 The correction formulas include: When the amount of hydrocarbons cracked from the kerogen is S 2水平 When the value is less than the obtained boundary point, the amount of kerogen cracked hydrocarbons S is obtained. 2水平 The first correction formula; When the amount of hydrocarbons cracked from the kerogen is S 2水平 When the value is greater than the obtained boundary point, the amount of kerogen cracked hydrocarbons S is obtained. 2水平 The second correction formula.

4. The method for quantitative evaluation and correction of pyrolysis parameters of shale oil under mixed oil conditions according to claim 3, characterized in that, The correction formulas for the remaining pyrolysis parameters of the horizontal well are obtained sequentially, including: The amount of free hydrocarbons S in the horizontal well is obtained sequentially. 1水平 The correction formula, residual organic carbon content S 4水平 The correction formula and the peak temperature T of the cracked hydrocarbon max水平 The correction formula.

5. The method for quantitative evaluation and correction of pyrolysis parameters of shale oil under mixed oil conditions according to claim 1, characterized in that, Calculate the derived parameters, including: Based on all corrected pyrolysis parameters, the oil production potential (Pg), available carbon (PC), and total organic carbon (TOC) were calculated respectively.

6. The method for quantitative evaluation and correction of pyrolysis parameters of shale oil under mixed oil conditions according to any one of claims 1-5, characterized in that, The source rock pyrolysis parameter data of the pilot hole target window are logging analysis data under water-based drilling fluid conditions; The source rock pyrolysis parameter data of the horizontal well are analysis data obtained from well logging under oil-based drilling fluid conditions.

7. A device for quantitative evaluation and correction of pyrolysis parameters of shale oil under mixed oil conditions, characterized in that, include: The data collection module is used to collect source rock pyrolysis parameter data from the pilot well target window and horizontal wells, including the amount of kerogen cracking hydrocarbons S in the pilot well target window. 2导眼 kerogen cracking hydrocarbon content S in horizontal wells 2水平 ; The sorting and segmentation module is used to sort the amount of hydrocarbons S cracked from kerogen. 2导眼 and the amount of hydrocarbons S cracked from kerogen 2水平 Sort; determine the amount of hydrocarbons S from kerogen cracking. 2导眼 The segments are divided according to the set rules to obtain segmented intervals; the amount of kerogen cracked hydrocarbons S is then... 2水平 Divide into segments according to the corresponding segment intervals; The formula fitting module is used to establish the amount of hydrocarbons S cracked from kerogen. 2导眼 and the amount of hydrocarbons S cracked from kerogen 2水平 The relationship between the two factors is used to obtain the amount of hydrocarbons S from kerogen cracking using a piecewise fitting formula. 2水平 The correction formula; The parameter correction module is used to adjust the amount of hydrocarbons S cracked from kerogen using the obtained correction formula. 2水平 The correction is performed according to the segmented intervals to obtain the corrected parameter S. 2校正 ; The formula fitting module is also used to establish the relationship between the remaining source rock pyrolysis parameters of the pilot well target window and the remaining pyrolysis parameters of the corresponding horizontal well in a segmented interval, and to obtain the correction formulas for the remaining pyrolysis parameters of the horizontal well in a sequential manner. The parameter correction module is also used to correct the remaining pyrolysis parameters of the horizontal well according to the segmented intervals using the successively obtained correction formulas, and to calculate the derived parameters.

8. The pyrolysis parameter correction device for quantitative evaluation of shale oil under mixed oil conditions according to claim 7, characterized in that, The formula fitting module is specifically used to establish the relationship between the remaining source rock pyrolysis parameters of the pilot hole target window and the corresponding remaining pyrolysis parameters of the horizontal well according to segmented intervals, and to fit the formula to obtain the free hydrocarbon content S of the horizontal well. 1水平 The correction formula, residual organic carbon content S 4水平 The correction formula and the peak temperature T of the cracked hydrocarbon max水平 The correction formula.

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