Method, device, medium and equipment for calibrating well logging porosity of buried hill fractured reservoir

Abstract

The invention relates to a buried hill fractured reservoir logging porosity calibration method, device, medium and equipment, and the method comprises the steps: carrying out the physical analysis based on an oil and gas field buried hill fractured reservoir sample, and obtaining the porosity and permeability; on the basis of the porosity and the permeability, a cross plot of the porosity and the permeability of the buried hill fractured reservoir of the oil and gas field is constructed, and according to the distribution range of the permeability of the full-diameter core sample and the permeability of the plunger core sample in the cross plot, the threshold value of the permeability of the full-diameter core sample and the threshold value of the permeability of the plunger core sample are determined; based on the logging data of the oil and gas field buried hill fractured reservoir, the fracture porosity, the permeability and the logging porosity of the oil and gas field buried hill fractured reservoir are obtained through calculation; comparing the calculated permeability of the buried hill fractured reservoir of the oil and gas field with the boundary value of the permeability of the full-diameter core sample and the permeability of the plunger core sample, and judging the development condition of the buried hill fractured reservoir of the oil and gas field.

Description

Technical Field

[0001] The invention relates to a method, a device, a medium and equipment for calibrating the well logging porosity of a buried hill fracture reservoir, and belongs to the technical field of marine oil and gas field exploitation. Background Art

[0002] Porosity, oil and gas saturation, effective thickness, and oil and gas area are the four key parameters for calculating proven geological reserves. Among them, porosity is generally obtained by calibrating the porosity of core analysis logging and calculating the porosity. At present, there are relatively few analysis data on drilling cores and full-diameter cores (hereinafter referred to as "drilling cores and full-diameter cores" as "full-diameter cores") for offshore buried-hill fractured reservoirs, and relatively more analysis data on plug cores or wall cores (hereinafter referred to as "plug cores or wall cores" as "plug cores"). In general, the porosity of full-diameter core analysis includes matrix porosity and fracture porosity, which is the total porosity; the permeability of full-diameter core analysis includes matrix permeability and fracture permeability, which is the total permeability. Due to the limitation of the plug size, the porosity of plug core analysis only represents the matrix porosity and does not include fracture porosity. Therefore, using the plunger core analysis porosity to calibrate the porosity calculated by logging will result in a smaller porosity calculated by logging, and thus make the calculated proven geological reserves of the buried hill fracture oil and gas reservoirs smaller.

[0003] First, the effectiveness of fractures is determined from the perspective of whether they contribute to permeability. If effective fractures are developed, the porosity calculated by logging in the buried hill fracture reservoir should be equal to the sum of matrix porosity and fracture porosity. When full-diameter core analysis data are available, the porosity calculated by logging should be calibrated with the porosity of full-diameter core analysis; when full-diameter core analysis data are not available, the porosity calculated by logging should be calibrated with the sum of the porosity of plunger core analysis and fracture porosity. On the contrary, if invalid fractures are developed or no fractures are developed, the porosity calculated by logging should be calibrated with the porosity of plunger core analysis. Therefore, a porosity calibration method for buried hill fracture reservoirs is formed for buried hill fracture oil and gas reservoirs, which lays an important foundation for accurately calculating the proven geological reserves of deep / ultra-deep buried hill fracture oil and gas fields. Summary of the invention

[0004] In view of the above technical problems, the present invention provides a method, device, medium and equipment for calibrating the porosity of buried hill fractured reservoirs by well logging. The method can accurately calculate the porosity of deep / ultra-deep buried hill fractured reservoirs and objectively estimate the proven geological reserves of buried hill fractured oil and gas fields.

[0005] To achieve the above object, the present invention adopts the following technical solutions: A method for calibrating the porosity of a buried hill fractured reservoir by logging, comprising: Based on the full-diameter core samples and plunger core samples at a certain depth of the fractured reservoir in the buried hill of the oil and gas field, physical property analysis is carried out to obtain the porosity and permeability of the full-diameter core samples and plunger core samples; Based on the porosity and permeability of full-diameter core samples and plug core samples, a cross plot of the porosity and permeability of full-diameter core samples and plug core samples of the buried hill fracture reservoir of the oil and gas field was constructed. According to the distribution range of the permeability of the full-diameter core samples and the permeability of the plug core samples in the cross plot, the limit values ​​of the permeability of the full-diameter core samples and the permeability of the plug core samples were determined. Based on the well logging data of the fractured reservoirs in the buried hills of oil and gas fields, the fracture porosity of the fractured reservoirs in the buried hills of oil and gas fields is calculated; Based on the well logging data of the fractured reservoirs in the buried hills of oil and gas fields, the permeability of the fractured reservoirs in the buried hills of oil and gas fields is calculated; Based on the logging data of the fractured reservoirs in the buried hills of oil and gas fields, the logging porosity of the fractured reservoirs in the buried hills of oil and gas fields is calculated; By comparing the calculated permeability of the fractured reservoir in the buried hill of the oil and gas field with the limit values ​​of the permeability of the full-diameter core sample and the permeability of the plunger core sample, the development of the fractured reservoir in the buried hill of the oil and gas field and the error between the logging porosity and the fracture porosity and the porosity of the plunger core sample can be judged.

[0006] In the method for calibrating the porosity of buried-hill fractured reservoir logging, preferably, the logging data include natural gamma, natural potential, deep resistivity, medium resistivity, shallow resistivity, volume density, neutron porosity, P-wave time difference, S-wave time difference, Stoneley wave time difference and electrical imaging.

[0007] The method for calibrating the well logging porosity of the buried hill fractured reservoir is preferably based on the well logging data of the buried hill fractured reservoir of the oil and gas field to calculate the fracture porosity of the buried hill fractured reservoir of the oil and gas field. The calculation formula of the fracture porosity is as follows:

[0008] Where: φ f is the fracture porosity; m f is the fracture porosity index; R m is the mud resistivity; R s is the shallow lateral resistivity; K f is the crack distortion coefficient; R d is the deep lateral resistivity.

[0009] The method for calibrating the porosity of a buried hill fractured reservoir by logging is preferably based on the logging data of the buried hill fractured reservoir of the oil and gas field to calculate the permeability of the buried hill fractured reservoir of the oil and gas field. The calculation formula of the permeability is as follows:

[0010] Where: K t is the well logging permeability; is the frequency shift of Stoneley waves; is the time lag of the Stoneley wave.

[0011] The method for calibrating the well logging porosity of the buried hill fractured reservoir is preferably based on the well logging data of the buried hill fractured reservoir of the oil and gas field to calculate the well logging porosity of the buried hill fractured reservoir of the oil and gas field. The calculation formula of the well logging porosity is as follows:

[0012] Where: φ t is the well logging porosity; GR is natural gamma; R t is the deep resistivity; R xo is the resistivity of the flushing zone; DEN is the bulk density; NPHI is the neutron porosity; DT is the longitudinal wave time difference.

[0013] The method for calibrating the well logging porosity of the buried hill fractured reservoir is preferably to compare the calculated permeability of the buried hill fractured reservoir of the oil and gas field with the limit values ​​of the full-diameter core sample permeability and the plunger core sample permeability to judge the development of the buried hill fractured reservoir of the oil and gas field and the error between the well logging porosity and the fracture porosity and the porosity of the plunger core sample, as follows: When the calculated permeability of the buried-hill fracture reservoir in the oil and gas field is greater than or equal to the limit value of the full-diameter core sample permeability and the plunger core sample permeability, it indicates that the buried-hill fracture reservoir has developed effective fractures; otherwise, it indicates that the buried-hill fracture reservoir has no fractures or has developed ineffective fractures.

[0014] The method for calibrating the logging porosity of a buried hill fractured reservoir is preferably such that when the calculated permeability of the buried hill fractured reservoir of an oil and gas field is greater than or equal to the limit value of the permeability of a full-diameter core sample and the permeability of a plunger core sample, the error between the logging porosity and the sum of the fracture porosity and the porosity of the plunger core sample is minimized.

[0015] A second aspect of the present invention provides a buried hill fracture reservoir well logging porosity calibration device, comprising: The first processing unit is used to carry out physical property analysis based on full-diameter core samples and plunger core samples at a certain depth of the buried hill fracture reservoir of the oil and gas field to obtain the porosity and permeability of the full-diameter core samples and plunger core samples; The second processing unit is used to construct a cross-plot of the porosity and permeability of the full-diameter core samples and the plug core samples of the buried hill fracture reservoir of the oil and gas field based on the porosity and permeability of the full-diameter core samples and the plug core samples, and determine the limit values ​​of the permeability of the full-diameter core samples and the permeability of the plug core samples according to the distribution range of the permeability of the full-diameter core samples and the permeability of the plug core samples in the cross-plot; The third processing unit is used to calculate the fracture porosity of the buried hill fracture reservoir of the oil and gas field based on the well logging data of the buried hill fracture reservoir of the oil and gas field; A fourth processing unit is used to calculate the permeability of the buried hill fractured reservoir of the oil and gas field based on the well logging data of the buried hill fractured reservoir of the oil and gas field; A fifth processing unit is used to calculate the logging porosity of the buried hill fractured reservoir of the oil and gas field based on the logging data of the buried hill fractured reservoir of the oil and gas field; The sixth processing unit is used to compare the calculated permeability of the fractured reservoir in the buried hill of the oil and gas field with the limit values ​​of the permeability of the full-diameter core sample and the permeability of the plunger core sample, so as to judge the development of the fractured reservoir in the buried hill of the oil and gas field and the error size between the logging porosity and the fracture porosity and the porosity of the plunger core sample.

[0016] A third aspect of the present invention provides a computer-readable storage medium having a computer program stored thereon, wherein the computer program, when executed by a processor, implements the steps of any one of the above-mentioned methods for calibrating the porosity of buried-hill fractured reservoir logging.

[0017] A fourth aspect of the present invention provides a computer device, comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein when the processor executes the computer program, the steps of any one of the above-mentioned methods for calibrating the porosity of a buried hill fractured reservoir by logging are implemented.

[0018] The present invention adopts the above technical solution, which has the following advantages: 1. The method of the present invention avoids carrying out a large amount of drilling coring and full-diameter core analysis, can effectively save costs, improve the benefits of exploration and development of buried hill fractured oil and gas reservoirs, and has strong economic efficiency.

[0019] 2. The method of the present invention provides an effective, simple and practical new method while ensuring accurate calculation of the porosity of deep / ultra-deep buried hill fracture reservoirs. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1yes A Cross-plot of full diameter, plug core analysis porosity and core analysis permeability of fractured reservoirs in buried hills of oil fields; Figure 2 yes B Cross-plot of full diameter, plug core analysis porosity and core analysis permeability of fractured reservoirs in buried hills of oil fields; Figure 3 yes A oilfield A1 Results of fracture porosity, porosity calculated by well logging, and permeability calculated by well logging in the fractured reservoir section with more developed fractures in the buried hill; Figure 4 yes B oilfield B1 Results of fracture porosity, porosity calculated by well logging, and permeability calculated by well logging in the fractured reservoir section with more developed fractures in the buried hill; Figure 5 yes A oilfield A2 Results of fracture porosity, porosity calculated by well logging, and permeability calculated by well logging in the fractured reservoir section without fractures in the buried hill; Figure 6 yes B oilfield B1 Results of fracture porosity, porosity calculated by well logging, and permeability calculated by well logging in the fractured reservoir section with sparse fractures in the buried hill. DETAILED DESCRIPTION

[0021] In order to make the purpose, technical solution and advantages of the present invention clearer, the technical solution of the present invention is described clearly and completely below. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary persons in the art without creative work are within the scope of protection of the present invention.

[0022] Unless otherwise defined, the technical or scientific terms used in the present invention shall have the usual meanings understood by persons with ordinary skills in the field to which the present invention belongs. The words "first", "second", "third", "fourth" and similar terms used in the present invention do not indicate any order, quantity or importance, but are only used to distinguish different components. Words such as "include" or "comprise" and the like mean that the elements or objects appearing before the word include the elements or objects listed after the word and their equivalents, without excluding other elements or objects. Words such as "connect" or "connected" and the like are not limited to physical or mechanical connections, but may include electrical connections, whether direct or indirect.

[0023] For ease of description, spatially relative terms may be used herein to describe the relationship of one element or feature relative to another element or feature as shown in the figures, such as "inside", "outside", "inner side", "outer side", "below", "above", etc. Such spatially relative terms are intended to include different orientations of the device in use or operation in addition to the orientation depicted in the figures.

[0024] Whether the fractures are effective is determined from the perspective of whether they contribute to the permeability; if effective fractures are developed, the porosity calculated by logging in the buried hill fracture reservoir should be equal to the sum of the matrix porosity and the fracture porosity. When full-diameter core analysis data are available, the porosity calculated by logging should be calibrated with the porosity of full-diameter core analysis; when full-diameter core analysis data are not available, the porosity calculated by logging should be calibrated with the sum of the porosity of plunger core analysis and the porosity of fracture. On the contrary, if invalid fractures are developed or no fractures are developed, the porosity calculated by logging should be calibrated with the porosity of plunger core analysis. Therefore, a calibration method for the porosity of buried hill fracture reservoir logging is formed for buried hill fracture oil and gas reservoirs, which lays an important foundation for accurately calculating the proven geological reserves of deep / ultra-deep buried hill fracture oil and gas fields.

[0025] Based on the above technical problems, the present invention provides a method for calibrating the porosity of buried hill fractured reservoirs by well logging, which can accurately calculate the porosity of deep / ultra-deep buried hill fractured reservoirs and objectively estimate the proven geological reserves of buried hill fractured oil and gas fields.

[0026] like Figure 1 As shown, the method for calibrating the porosity of a buried hill fractured reservoir provided by the present invention comprises the following specific steps: 1) Based on the full-diameter core samples and plug core samples at a certain depth of the fractured reservoir in a buried hill of a certain oil and gas field, the physical property analysis of the full-diameter core samples and plug core samples is carried out to measure the porosity and permeability of each full-diameter core sample and plug core sample, that is, the full-diameter core and plug core analytical porosity and core analytical permeability, where the full-diameter core analytical porosity and core analytical permeability represent the total porosity ( φ tc ) and total permeability ( K tc ), plug core analysis porosity and core analysis permeability represent matrix porosity ( φ mc ) and matrix permeability ( K mc ).

[0027] 2) Based on the core analysis porosity and core analysis permeability of the full-diameter core samples and the plug core samples at a certain depth of the buried-hill fractured reservoir of a certain oil and gas field in step 1), a cross-plot of the full-diameter core, the plug core analysis porosity and the core analysis permeability of the buried-hill fractured reservoir of the oil and gas field is constructed, and according to the distribution range of the full-diameter core analysis permeability and the plug core analysis permeability in the cross-plot, the limit values ​​of the full-diameter core analysis permeability and the plug core analysis permeability are determined ( D ). The permeability is greater than or equal to the limit value ( D ), indicating the development of effective fractures; the permeability is less than this limit value ( D ), indicating that no effective cracks are developed.

[0028] Figure 1 yes A The cross plot of porosity and permeability of full-diameter core, plunger core analysis and core analysis of fractured reservoir in oilfield buried hill is shown in Figure 1. Figure 1 Knowable A The limit value of permeability of full-diameter core analysis and plug core analysis in oil fields D =0.1mD.

[0029] Figure 2 yes B The cross plot of porosity and permeability of full-diameter core, plunger core analysis and core analysis of fractured reservoir in oilfield buried hill is shown in Figure 1. Figure 2 Knowable B The limit value of permeability of full-diameter core analysis and plug core analysis in oil fields D =1.0mD.

[0030] 3) For the buried hill fracture reservoir of the oil and gas field, the logging instrument can measure a series of logging data (natural gamma, natural potential, deep resistivity, medium resistivity, shallow resistivity, volume density, neutron porosity, P-wave time difference, S-wave time difference, Stoneley wave time difference, electrical imaging); based on the deep resistivity and shallow resistivity logging data, the fracture porosity of the buried hill fracture reservoir can be calculated, see formula (1): (1) Where: φ f is the fracture porosity, %; m f is the fracture porosity index, dimensionless, usually 1.3-1.8; R m is the mud resistivity, Ω·m; R s is the shallow lateral resistivity, Ω·m; K f is the crack distortion coefficient, which is about 1.3 for horizontal cracks and about 1.0 for vertical cracks;R d is the deep lateral resistivity, Ω·m.

[0031] 4) Based on the Stoneley wave of the buried hill fracture reservoir in a well of the oil and gas field acquired in step 3), the main frequency and arrival time of the Stoneley wave are matched, and the calculation formula of the permeability of the buried hill fracture reservoir is constructed by the least square method, as shown in formula (2): (2) Where: K t is the well logging permeability, mD; is the frequency shift of Stoneley wave, kHz; is the time lag of the Stoneley wave, ms.

[0032] Minimize the error between the permeability calculated by logging and the permeability of the full-diameter core analysis in step 2).

[0033] 5) Based on the natural gamma, deep resistivity, shallow resistivity, bulk density, neutron porosity, P-wave time difference and other logging data of the buried hill fracture reservoir in a well of the oil and gas field collected in step 3), the rock mineral component content and porosity of the buried hill fracture reservoir can be calculated, that is, the logging porosity, as shown in formula (3): (3) Where: φ t is the logging porosity, %; GR is natural gamma, API; R t is the deep resistivity, Ω·m; R xo is the resistivity of the flushing zone, Ω·m; DEN is the bulk density, g / cm 3 ; NPHI is the neutron porosity, %; DT is the longitudinal wave time difference, μs / ft.

[0034] 6) When the permeability is calculated in step 4) K t Greater than or equal to the limit value of the full diameter core analysis permeability and the plunger core analysis permeability in step 2) D When , it indicates that the buried-hill fracture reservoir has developed effective fractures; otherwise, it indicates that the buried-hill fracture reservoir has no fractures or has developed ineffective fractures.

[0035] 7) When K t ≥ D Step 5) The porosity calculated by logging φ tThe porosity should be the same as that of the plunger core analysis in step 1). φ mc and step 3) fracture porosity φ f The error between the sum is minimal.

[0036] The present invention can obtain parameters such as fracture porosity, logging-calculated porosity, logging-calculated permeability, etc. of the buried hill fracture reservoir through processing and interpretation by logging software such as Geolog, Techlog, and CIFLog.

[0037] Figure 3 yes A oilfield A1 Results of fracture porosity, total porosity calculated by well logging, and total permeability calculated by well logging in the fractured reservoir with more developed fractures in the buried hill: Track 1 is the measured depth of the formation; The second track is the natural gamma and well diameter, indicating the lithological characteristics of the formation; The third track is the deep and shallow resistivity logging curves, which characterize the electrical characteristics of the formation; Track 4 is volume density, neutron porosity and acoustic time difference, reflecting the physical characteristics of the formation; Track 5 is fracture porosity; Track 6 is the full-diameter, plug-core analysis porosity; Track 7 is the sum of the plug core analysis porosity and the fracture porosity, the plug core analysis porosity; Track 8 is the total porosity of core analysis (including the sum of full-diameter core analysis porosity, plug core analysis porosity and fracture porosity) and total porosity calculated by well logging; Track 9 is the permeability of the full-diameter core analysis and the total permeability calculated by logging; Track 10 is the content of quartz, feldspar and mica calculated by well logging.

[0038] From the 9th track, we can see that the full-diameter core analysis permeability, that is, the total core analysis permeability, is consistent with the Stoneley wave permeability calculated in step 4), that is, the total permeability calculated by logging, which shows that the total permeability calculated by logging is more accurate. From step 2), we can see A The limit value of permeability of full-diameter core analysis and plug core analysis in oil fields D =0.1mD; while the total permeability calculated by logging is basically greater than 0.1mD, indicating Figure 3 shown A oilfield A1 The fractured reservoirs in the buried hills have effective fractures. Therefore, in addition to the porosity of the full-diameter core analysis (with relatively few data points), A oilfield A1The total porosity of the fractured reservoir in the buried hill is equal to the sum of the plug core analysis porosity (relatively more data points) and the fracture porosity, see Figure 3 Track 7. Track 8 shows that the absolute error between the total porosity of core analysis (including the sum of the porosity of full-diameter core analysis, the porosity of plunger core analysis and the porosity of fractures) and the total porosity calculated by well logging is 4.76%, while the absolute error between the porosity of plunger core analysis and the total porosity calculated by well logging is 8.79%.

[0039] Figure 4 yes B oilfield B1 Results of fracture porosity, total porosity calculated by well logging, and total permeability calculated by well logging in the fractured reservoir with more developed fractures in the buried hill: Track 1 is the measured depth of the formation; The second track is the natural gamma and well diameter, indicating the lithological characteristics of the formation; The third track is the deep and shallow resistivity logging curves, which characterize the electrical characteristics of the formation; Track 4 is volume density, neutron porosity and acoustic time difference, reflecting the physical characteristics of the formation; Track 5 is fracture porosity; Track 6 is the full-diameter, plug-core analysis porosity; Track 7 is the sum of the plug core analysis porosity and the fracture porosity, the plug core analysis porosity; Track 8 is the total porosity of core analysis (including the sum of full-diameter core analysis porosity, plug core analysis porosity and fracture porosity) and total porosity calculated by well logging; Track 9 is the permeability of the full-diameter core analysis and the total permeability calculated by logging; The 10th track is the content of sandstone, dolomite, limestone and mudstone calculated by well logging.

[0040] From the 9th track, we can see that the full-diameter core analysis permeability, that is, the total core analysis permeability, is consistent with the Stoneley wave permeability calculated in step 4), that is, the total permeability calculated by logging, which shows that the total permeability calculated by logging is more accurate. From step 2), we can see B The limit value of permeability of full-diameter core analysis and plug core analysis in oil fields D =1.0mD; while the total permeability calculated by logging is basically greater than 1.0mD, indicating Figure 4 shown B oilfield B1 The fractured reservoirs in the buried hills have effective fractures. Therefore, in addition to the porosity of the full-diameter core analysis (with relatively few data points), B oilfield B1 The total porosity of the fractured reservoir in the buried hill is equal to the sum of the plug core analysis porosity (relatively more data points) and the fracture porosity, see Figure 4 Track 7. Track 8 shows that the absolute error between the total porosity of core analysis (including the sum of the porosity of full-diameter core analysis, the porosity of plunger core analysis and the porosity of fractures) and the total porosity calculated by well logging is 4.05%, while the absolute error between the porosity of plunger core analysis and the total porosity calculated by well logging is 8.04%.

[0041] when K t ﹤ D Step 5) The porosity calculated by logging φ t The porosity should be the same as that of the plunger core analysis in step 1). φ mc The error between them is minimal.

[0042] Figure 5 yes A oilfield A2 Results of fracture porosity in the fractured reservoir section with undeveloped fractures in the buried hill, total porosity calculated by well logging, and total permeability calculated by well logging: Track 1 is the measured depth of the formation; The second track is the natural gamma and well diameter, indicating the lithological characteristics of the formation; The third track is the deep and shallow resistivity logging curves, which characterize the electrical characteristics of the formation; Track 4 is volume density, neutron porosity and acoustic time difference, reflecting the physical characteristics of the formation; Track 5 is fracture porosity; Track 6 is the full-diameter, plug-core analysis porosity; Track 7 is the total porosity of core analysis (including full-diameter core analysis porosity, plunger core analysis porosity) and total porosity calculated by well logging; Track 8 is the permeability of the full-diameter core analysis and the total permeability calculated by logging; Track 9 is the content of quartz, feldspar and mica calculated by well logging.

[0043] From the 8th track, we can see that the full-diameter core analysis permeability, that is, the total core analysis permeability, is consistent with the Stoneley wave permeability calculated in step 4), that is, the total permeability calculated by logging, which shows that the total permeability calculated by logging is more accurate. From step 2), we can see A The limit value of permeability of full-diameter core analysis and plug core analysis in oil fields D =0.1mD; while the total permeability calculated by logging is basically less than 0.1mD, indicating Figure 5 shown A oilfield A1The fractured reservoirs in the buried hills have no fractures or have ineffective fractures. Therefore, the porosity of the full diameter and plunger core analysis are all total porosity, as shown in Track 7. The absolute error between the total porosity of the core analysis and the total porosity calculated by logging is 4.96%.

[0044] Figure 6 yes B oilfield B1 Results of fracture porosity in the fractured reservoir section with sparse fractures in the buried hill, total porosity calculated by well logging, and total permeability calculated by well logging.

[0045] Track 1 is the measured depth of the formation; The second track is the natural gamma and well diameter, indicating the lithological characteristics of the formation; The third track is the deep and shallow resistivity logging curves, which characterize the electrical characteristics of the formation; Track 4 is volume density, neutron porosity and acoustic time difference, reflecting the physical characteristics of the formation; Track 5 is fracture porosity; Track 6 is the porosity of the plug core analysis; Track 7 is the sum of the plug core analysis porosity and the fracture porosity; Track 8 is the total porosity from core analysis (the sum of the porosity from plunger core analysis and the porosity from fractures) and the total porosity calculated from well logging; Track 9 is the total permeability calculated from the well logging; The 10th track is the content of sandstone, dolomite, limestone and mudstone calculated by well logging.

[0046] From question 9, we know that from step 2) B The limit value of permeability of full-diameter core analysis and plug core analysis in oil fields D =1.0mD.

[0047] exist Figure 6 In the buried hill fracture reservoir section I, the total permeability calculated by well logging is basically less than 1.0 mD, indicating that there are no fractures or ineffective fractures in the buried hill fracture reservoir section; therefore, the porosity of the plunger core analysis is the total porosity. Figure 6 In the buried hill fractured reservoir section II, the total permeability calculated by well logging is basically greater than 1.0 mD, indicating that effective fractures are developed in this buried hill fractured reservoir section; therefore, the sum of the plunger core analysis porosity and the fracture porosity is the total porosity. The absolute error between the total porosity of the 8th core analysis and the total porosity calculated by well logging is 1.50%.

[0048] A second aspect of the present invention provides a buried hill fracture reservoir well logging porosity calibration device, comprising: The first processing unit is used to carry out physical property analysis based on full-diameter core samples and plunger core samples at a certain depth of the buried hill fracture reservoir of the oil and gas field to obtain the porosity and permeability of the full-diameter core samples and plunger core samples; The second processing unit is used to construct a cross-plot of the porosity and permeability of the full-diameter core samples and the plug core samples of the buried hill fracture reservoir of the oil and gas field based on the porosity and permeability of the full-diameter core samples and the plug core samples, and determine the limit values ​​of the permeability of the full-diameter core samples and the permeability of the plug core samples according to the distribution range of the permeability of the full-diameter core samples and the permeability of the plug core samples in the cross-plot; The third processing unit is used to calculate the fracture porosity of the buried hill fracture reservoir of the oil and gas field based on the well logging data of the buried hill fracture reservoir of the oil and gas field; A fourth processing unit is used to calculate the permeability of the buried hill fractured reservoir of the oil and gas field based on the well logging data of the buried hill fractured reservoir of the oil and gas field; A fifth processing unit is used to calculate the logging porosity of the buried hill fractured reservoir of the oil and gas field based on the logging data of the buried hill fractured reservoir of the oil and gas field; The sixth processing unit is used to compare the calculated permeability of the fractured reservoir in the buried hill of the oil and gas field with the limit values ​​of the permeability of the full-diameter core sample and the permeability of the plunger core sample, so as to judge the development of the fractured reservoir in the buried hill of the oil and gas field and the error size between the logging porosity and the fracture porosity and the porosity of the plunger core sample.

[0049] A third aspect of the present invention provides a computer-readable storage medium having a computer program stored thereon, wherein the computer program, when executed by a processor, implements the steps of any one of the above-mentioned methods for calibrating the porosity of buried-hill fractured reservoir logging.

[0050] A fourth aspect of the present invention provides a computer device, comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein when the processor executes the computer program, the steps of any one of the above-mentioned methods for calibrating the porosity of a buried hill fractured reservoir by logging are implemented.

[0051] The present invention is described in terms of flowcharts and / or block diagrams of methods, devices (systems), and computer program products according to specific embodiments. It should be understood that each process and / or block in the flowchart and / or block diagram, as well as the combination of processes and / or blocks in the flowchart and / or block diagram, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, a special-purpose computer, an embedded processor, or other programmable data processing device to generate a machine, so that the instructions executed by the processor of the computer or other programmable data processing device generate instructions for implementing the processes in the flowchart and / or block diagram. Figure 1 A process or multiple processes and / or boxes Figure 1 A device that provides the functions specified in a block or multiple blocks.

[0052] These computer program instructions may also be stored in a computer-readable memory capable of directing a computer or other programmable data processing device to operate in a specific manner, so that the instructions stored in the computer-readable memory produce an article of manufacture comprising an instruction device, which implements the process Figure 1 A process or multiple processes and / or boxes Figure 1 A function specified in one or more boxes.

[0053] These computer program instructions can also be loaded onto a computer or other programmable data processing device so that a series of operating steps are executed on the computer or other programmable device to produce a computer-implemented process, thereby providing instructions for implementing the process. Figure 1 A process or multiple processes and / or boxes Figure 1 The steps for the functions specified in one or more boxes.

[0054] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A method for calibrating the porosity of a buried hill fractured reservoir by logging, characterized in that: include: Based on the full-diameter core samples and plunger core samples at a certain depth of the fractured reservoir in the buried hill of the oil and gas field, physical property analysis is carried out to obtain the porosity and permeability of the full-diameter core samples and plunger core samples; Based on the porosity and permeability of full-diameter core samples and plug core samples, a cross plot of the porosity and permeability of full-diameter core samples and plug core samples of the buried hill fracture reservoir of the oil and gas field was constructed. According to the distribution range of the permeability of the full-diameter core samples and the permeability of the plug core samples in the cross plot, the limit values ​​of the permeability of the full-diameter core samples and the permeability of the plug core samples were determined. Based on the well logging data of the fractured reservoirs in the buried hills of oil and gas fields, the fracture porosity of the fractured reservoirs in the buried hills of oil and gas fields is calculated; Based on the well logging data of the fractured reservoirs in the buried hills of oil and gas fields, the permeability of the fractured reservoirs in the buried hills of oil and gas fields is calculated; Based on the logging data of the fractured reservoirs in the buried hills of oil and gas fields, the logging porosity of the fractured reservoirs in the buried hills of oil and gas fields is calculated; By comparing the calculated permeability of the fractured reservoir in the buried hill of the oil and gas field with the limit values ​​of the permeability of the full-diameter core sample and the permeability of the plunger core sample, the development of the fractured reservoir in the buried hill of the oil and gas field and the error between the logging porosity and the fracture porosity and the porosity of the plunger core sample can be judged.

2. The method for calibrating the porosity of buried hill fractured reservoir logging according to claim 1, characterized in that: Well logging data include natural gamma, natural potential, deep resistivity, medium resistivity, shallow resistivity, bulk density, neutron porosity, P-wave transit time, S-wave transit time, Stoneley wave transit time and electrical imaging.

3. The method for calibrating the porosity of buried hill fractured reservoir logging according to claim 1, characterized in that: Based on the well logging data of the buried hill fracture reservoirs in the oil and gas fields, the fracture porosity of the buried hill fracture reservoirs in the oil and gas fields is calculated. The calculation formula of the fracture porosity is as follows: Where: φ f is the fracture porosity; m f is the fracture porosity index; R m is the mud resistivity; R s is the shallow lateral resistivity; K f is the crack distortion coefficient; R d is the deep lateral resistivity.

4. The method for calibrating the porosity of buried hill fractured reservoir logging according to claim 1, characterized in that: Based on the well logging data of the fractured reservoirs in the buried hills of oil and gas fields, the permeability of the fractured reservoirs in the buried hills of oil and gas fields is calculated. The calculation formula of the permeability is as follows: Where: K t is the well logging permeability; is the frequency shift of Stoneley waves; is the time lag of the Stoneley wave.

5. The method for calibrating the porosity of buried hill fractured reservoir logging according to claim 1, characterized in that: Based on the logging data of the fractured reservoirs in the buried hills of oil and gas fields, the logging porosity of the fractured reservoirs in the buried hills of oil and gas fields is calculated. The calculation formula of the logging porosity is as follows: Where: φ t is the well logging porosity; GR is natural gamma; R t is the deep resistivity; R xo is the resistivity of the flushing zone; DEN is the bulk density; NPHI is the neutron porosity; DT is the longitudinal wave time difference.

6. The method for calibrating the porosity of buried hill fractured reservoir logging according to claim 1, characterized in that: The permeability of the fractured reservoir in the buried hill of the oil and gas field is compared with the limit values ​​of the permeability of the full-diameter core sample and the permeability of the plunger core sample to judge the development of the fractured reservoir in the buried hill of the oil and gas field and the error between the logging porosity and the fracture porosity and the porosity of the plunger core sample, as follows: When the calculated permeability of the buried-hill fracture reservoir in the oil and gas field is greater than or equal to the limit value of the full-diameter core sample permeability and the plunger core sample permeability, it indicates that the buried-hill fracture reservoir has developed effective fractures; otherwise, it indicates that the buried-hill fracture reservoir has no fractures or has developed ineffective fractures.

7. The method for calibrating the porosity of buried hill fractured reservoir logging according to claim 6, characterized in that: When the calculated permeability of the fractured reservoir in the buried hill of the oil and gas field is greater than or equal to the limit value of the permeability of the full-diameter core sample and the permeability of the plunger core sample, the error between the logging porosity and the sum of the fracture porosity and the porosity of the plunger core sample is minimized.

8. A buried hill fracture reservoir logging porosity calibration device, characterized in that: include: The first processing unit is used to carry out physical property analysis based on full-diameter core samples and plunger core samples at a certain depth of the buried hill fracture reservoir of the oil and gas field to obtain the porosity and permeability of the full-diameter core samples and plunger core samples; The second processing unit is used to construct a cross-plot of the porosity and permeability of the full-diameter core samples and the plug core samples of the buried hill fracture reservoir of the oil and gas field based on the porosity and permeability of the full-diameter core samples and the plug core samples, and determine the limit values ​​of the permeability of the full-diameter core samples and the permeability of the plug core samples according to the distribution range of the permeability of the full-diameter core samples and the permeability of the plug core samples in the cross-plot; The third processing unit is used to calculate the fracture porosity of the buried hill fracture reservoir of the oil and gas field based on the well logging data of the buried hill fracture reservoir of the oil and gas field; A fourth processing unit is used to calculate the permeability of the buried hill fractured reservoir of the oil and gas field based on the well logging data of the buried hill fractured reservoir of the oil and gas field; A fifth processing unit is used to calculate the logging porosity of the buried hill fractured reservoir of the oil and gas field based on the logging data of the buried hill fractured reservoir of the oil and gas field; The sixth processing unit is used to compare the calculated permeability of the fractured reservoir in the buried hill of the oil and gas field with the limit values ​​of the permeability of the full-diameter core sample and the permeability of the plunger core sample, so as to judge the development of the fractured reservoir in the buried hill of the oil and gas field and the error size between the logging porosity and the fracture porosity and the porosity of the plunger core sample.

9. A computer-readable storage medium having a computer program stored thereon, characterized in that: When the computer program is executed by a processor, the steps of the method for calibrating the porosity of a buried hill fractured reservoir by logging are implemented as described in any one of claims 1 to 7.

10. A computer device comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, characterized in that: When the processor executes the computer program, the steps of the method for calibrating the porosity of a buried hill fractured reservoir by logging are implemented as described in any one of claims 1 to 7.

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