Method and system for measuring tendency and dip angle of rock core crack

Abstract

The invention discloses a method and a system for measuring the tendency and the dip angle of a rock core crack, which are used for determining a target crack surface by marking a crack surface appearing on a horizontal well rock core to be measured so as to avoid the interference of irrelevant characteristics. The included angle between the target fracture surface and the horizontal well track is measured, and the relative position relation of the fracture can be determined by means of known horizontal well track information. Based on the included angle, the intersection position relation of the target fracture surface and the rock core is further obtained, so that the inclination and inclination angle of the target fracture surface are accurately determined. The problem of inaccuracy possibly existing in direct measurement of the crack tendency and the inclination angle is solved, and the measurement precision is improved. The inclination direction and the inclination angle of a target fracture surface are recovered to the stratum condition, and deviation exists between the inclination direction and the inclination angle and the actual condition in the stratum due to the influence of various factors in the core taking-out and measuring process. Through the step, the interference factors can be eliminated, and the real inclination angle and tendency of the target fracture surface under the stratum condition are determined, so that the measurement result is more in line with the actual geological condition.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of oil fields, and relates to a method and system for measuring core fracture inclination and dip angle. BACKGROUND

[0002] The shale oil large platform horizontal well subdivision close volume fracturing technology has become a key technical weapon for shale oil benefit production. At present, the acquisition of artificial fracture parameters of hydraulic fracturing mainly relies on downhole microseismic method, but whether the microseismic monitoring fracture height and fracture width match the actual situation is controversial, and the actual fracture height and fracture length are far less than the distribution range of the microseismic event. Due to the small well spacing of shale oil large platform, the interwell channeling is prominent, or due to the large well spacing, the contradiction of low interwell reservoir producing degree is prominent, and the unclear understanding of artificial fracture vertical fracture recognition brings great challenges to the scale benefit development of shale oil.

[0003] At present, the most commonly used fracture measurement method is resistivity imaging logging, which measures the contrast between mud-containing fracture resistivity and surrounding rock resistivity by using drilling mud into the formation containing fractures, identifies the formation fractures, and imaging logging needs to be measured after drilling. Some wells cannot use imaging logging due to overflow, loss, etc., or do not measure imaging logging due to cost control. The method of drilling core is an effective means to understand fractures by identifying core fractures, and the main core fracture observation and analysis methods are full-diameter core CT scanning three-dimensional imaging and optical scanning. Full-diameter coring is high in cost and only a few test wells are equipped with testing. Invention patent CN201310507013.3 introduces a method for automatically identifying reservoir fractures based on electrical imaging logging porosity spectrum information, but does not involve the method of measuring fractures with cores. CN115524745A provides a method for measuring core-based fracture development and preservation parameter indicators, and classifies the fracture development degree, which does not involve fracture orientation. In the case of lack of precision instrument tools in drilling site core observation, it is difficult to measure core fracture dip angle and inclination, which leads to the inability to restore the formation state to establish a real space fracture network distribution. SUMMARY

[0004] The purpose of the present application is to solve the problems in the prior art and provide a method and system for measuring core fracture inclination and dip angle.

[0005] To achieve the above purpose, the following technical solutions are adopted in the present application: The present application provides a method for measuring core fracture inclination and dip angle, which comprises: Marking the fracture surface of the core of the horizontal well to be measured, and determining the target fracture surface; measuring the target fracture surface, obtaining the included angle between the target fracture surface and the horizontal well trajectory, and obtaining the position relationship between the target fracture surface and the core based on the included angle between the target fracture surface and the horizontal well trajectory, and determining the dip and the inclination of the target fracture surface; restoring the dip and the inclination of the target fracture surface to the formation condition, and determining the dip and the inclination of the target fracture surface under the formation condition.

[0006] Preferably, the measuring the target fracture surface, obtaining the included angle between the target fracture surface and the horizontal well trajectory, specifically comprises: measuring the target fracture surface, obtaining the maximum or minimum extreme value H 1t of the intersection depth of the fracture surface and the upper half circle of the core, and the maximum or minimum extreme value H 1b of the intersection depth of the fracture surface and the lower half circle; obtaining the included angle α1 between the target fracture surface and the horizontal well trajectory based on the maximum or minimum extreme value H 1t of the intersection depth of the fracture surface and the upper half circle of the core, and the maximum or minimum extreme value H 1b of the intersection depth of the fracture surface and the lower half circle; α1=atan(2r / (H 1t -H 1b )) / π*180; wherein r is the core radius, H 1-t is the maximum or minimum extreme value of the intersection depth of the fracture surface and the upper half circle of the core, and H 1-b is the maximum or minimum extreme value of the intersection depth of the fracture surface and the lower half circle.

[0007] Preferably, the obtaining the position relationship between the target fracture surface and the core based on the included angle between the target fracture surface and the horizontal well trajectory, and determining the dip and the inclination of the target fracture surface, specifically comprises: when the target fracture surface is perpendicular to the horizontal well trajectory, i.e. the minimum or maximum of the intersection of the target fracture surface and the core is at the 0° phase position, the included angle between the target fracture surface and the horizontal well trajectory is α1, and the fracture surface inclination angle β is the same as the horizontal well trajectory azimuth angle β0.

[0008] Preferably, the obtaining the position relationship between the target fracture surface and the core based on the included angle between the target fracture surface and the horizontal well trajectory, and determining the dip and the inclination of the target fracture surface, specifically comprises: when the target fracture surface is not perpendicular to the horizontal well trajectory, i.e. the minimum or maximum of the intersection of the target fracture surface and the core is not at the 0° phase position, the deflection arc length L of the target fracture surface is measured, and the angle β1 corresponding to the deflection arc length L is (L / 2πr)*360; wherein r is the core radius.

[0009] Preferably, the target fracture surface dip and inclination are restored to the formation condition, the inclination and dip of the target fracture surface in the formation condition are determined, and specifically: When H 1t >H 1b , according to the inclination of the horizontal well core, the angle between the core bedding seam or fracture and the core bottom is the angle a1 between the target fracture surface and the horizontal well trajectory, the target fracture surface dip and inclination are restored to the formation condition, the inclination α of the target fracture surface in the formation condition is determined as α0+α1-90, and the fracture surface dip angle β is β0+β1; wherein a0 is the trajectory inclination, β0 is the angle between the trajectory and the north direction, H 1-t is the maximum or minimum extreme value of the intersection depth of the fracture surface and the upper half circle of the core, and H 1-b is the maximum or minimum extreme value of the intersection depth of the fracture surface and the lower half circle.

[0010] Preferably, the target fracture surface dip and inclination are restored to the formation condition, the inclination and dip of the target fracture surface in the formation condition are determined, and specifically: When H 1t <H 1b , according to the inclination of the horizontal well core, the angle between the core bedding seam or fracture and the core bottom is the angle a1 between the target fracture surface and the horizontal well trajectory, the target fracture surface dip and inclination are restored to the formation condition, the inclination α of the target fracture surface in the formation condition is determined as α0+90-|(atan(2r / (H 1t -H 1b )))|, and the fracture surface dip angle β is β0+β1; wherein a0 is the trajectory inclination, H 1-t is the maximum or minimum extreme value of the intersection depth of the fracture surface and the upper half circle of the core, H 1-b is the maximum or minimum extreme value of the intersection depth of the fracture surface and the lower half circle, r is the core radius, β0 is the angle between the trajectory and the north direction, and β1 is the angle corresponding to the deflection arc length L.

[0011] The system for measuring the fracture dip and inclination of a core provided by the application comprises: A fracture acquisition module is configured to mark the fracture surface of the horizontal well core to be measured and determine the target fracture surface. A fracture calculation module is configured to measure the target fracture surface, obtain the angle between the target fracture surface and the horizontal well trajectory, obtain the position relationship between the target fracture surface and the core based on the angle between the target fracture surface and the horizontal well trajectory, and determine the dip and inclination of the target fracture surface. A fracture restoration module is configured to restore the dip and inclination of the target fracture surface to the formation condition and determine the inclination and dip of the target fracture surface in the formation condition.

[0012] A terminal device comprises a memory, a processor, and a computer program stored in the memory and executable on the processor, and the processor implements the steps of the method for measuring the inclination and dip angle of core cracks when executing the computer program.

[0013] A computer readable storage medium stores a computer program, and the computer program implements the steps of the method for measuring the inclination and dip angle of core cracks when executed by a processor.

[0014] A computer program product comprises a computer program, and the computer program implements the steps of the method for measuring the inclination and dip angle of core cracks when executed by a processor.

[0015] Compared with the prior art, the present application has the following beneficial effects: The method for measuring the inclination and dip angle of core cracks provided by the present application determines the target crack surface by marking the crack surface of the horizontal well core to be measured, can accurately locate the crack to be studied among numerous core characteristics, avoids interference with irrelevant characteristics, and lays a foundation for subsequent accurate measurement. The angle between the target crack surface and the horizontal well trajectory is measured, and the relative position relationship of the crack can be determined with the known horizontal well trajectory information. Based on the angle, the position relationship of the target crack surface intersecting with the core is further obtained, so that the inclination and dip angle of the target crack surface are accurately determined. This solves the problem of possible inaccuracy in directly measuring the inclination and dip angle of the crack, and improves the measurement accuracy. It is crucial to restore the inclination and dip angle of the target crack surface to the formation condition. During the core extraction and measurement process, it may be affected by various factors and deviate from the actual situation in the formation. Through this step, the interference factors can be eliminated, the true dip angle and inclination of the target crack surface in the formation condition are determined, and the measurement result is more consistent with the actual geological conditions. Therefore, the scheme provided by the present application can measure the core crack dip angle and inclination under the condition that the core observation in the drilling site lacks precision instrument tools, restore the real space fracture network distribution under the formation state, and efficiently solve the problem of unclear understanding of artificial fractures, thereby providing technical support for shale oil large platform well pattern optimization and fracturing design.

[0016] The system for measuring the inclination and dip angle of core cracks provided by the present application divides the system into a crack acquisition module, a crack calculation module, and a crack restoration module to determine the dip angle and inclination of the target crack surface in the formation condition, and realizes the measurement of the inclination and dip angle of the core crack. The modular idea makes each module independent of each other, facilitating unified management of each module. BRIEF DESCRIPTION OF DRAWINGS

[0017] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the following will briefly introduce the drawings needed to be used in the embodiments. It should be understood that the following drawings only show some of the embodiments of the present application, and therefore should not be regarded as a limitation on the scope. For those skilled in the art, other related drawings can also be obtained without creative labor on the basis of these drawings.

[0018] Figure 1 Flow chart of the method for measuring the fracture dip and inclination of the core according to the present application.

[0019] Figure 2 Schematic diagram of the core of the horizontal well placed on the observation platform according to the present application.

[0020] Figure 3 Schematic diagram of the core cylindrical scanning unfolding fracture measurement according to the present application.

[0021] Figure 4 Schematic diagram of the deflection arc length measurement according to the present application.

[0022] Figure 5 Schematic diagram of the first calculation of the core fracture inclination restored to the formation condition according to the present application.

[0023] Figure 6 Schematic diagram of the second calculation of the core fracture inclination restored to the formation condition according to the present application.

[0024] Figure 7 Schematic diagram of the core cylindrical scanning unfolding fracture measurement according to the present application.

[0025] Figure 8 System diagram for measuring the fracture dip and inclination of the core according to the present application.

[0026] Figure 9 Schematic diagram of the structure of an electronic device according to the present application. DETAILED DESCRIPTION

[0027] In order to make the purpose, technical solutions and advantages of the embodiments of the present application more clear, the following will combine the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are some of the embodiments of the present application, but not all the embodiments. The components of the embodiments of the present application described and shown in the drawings here can be arranged and designed in various different configurations.

[0028] Therefore, the following detailed description of the embodiments of the application provided in the accompanying drawings is not intended to limit the scope of the application claimed, but merely represents selected embodiments of the application. All other embodiments obtained by those of ordinary skill in the art based on the embodiments in the application without creative labor fall within the scope of the application.

[0029] It should be noted that similar reference numerals and letters represent similar items in the following drawings, and therefore, once an item is defined in one drawing, it need not be further defined and explained in subsequent drawings.

[0030] In the description of the embodiments of the application, it should be noted that if the terms such as 'upper', 'lower', 'horizontal', 'inner' and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, or the orientation or positional relationship in which the product of the application is usually placed, and are merely for the convenience of describing the application and simplifying the description, and therefore cannot be understood as indicating or implying that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the application. In addition, the terms 'first','second', etc. are only used to distinguish the description and cannot be understood as indicating or implying relative importance.

[0031] In addition, if the term 'horizontal' appears, it does not mean that the component must be absolutely horizontal, but can be slightly inclined. For example, 'horizontal' only means that its direction is relatively more horizontal than'vertical', and does not mean that the structure must be completely horizontal, but can be slightly inclined.

[0032] In the description of the embodiments of the application, it should also be noted that unless otherwise explicitly specified and limited, if the terms 'arrangement', 'installation', 'connection', 'connection' appear, they should be understood in a broad sense, for example, they can be fixedly connected, or detachably connected, or integrally connected; can be mechanically connected, or electrically connected; can be directly connected, or indirectly connected through an intermediate medium, or the internal communication of two elements. For those of ordinary skill in the art, the specific meaning of the above terms in the application can be understood according to the specific circumstances.

[0033] The application will be further described in detail below in conjunction with the drawings: Embodiment 1 The method for measuring the fracture dip and inclination of a core proposed by the application, as shown in Figure 1 includes: S1, marking the fracture surface appearing on the core of the horizontal well to be measured, and determining the target fracture surface; S2. Measure the target fracture surface to obtain the angle between the target fracture surface and the horizontal well trajectory. Based on the angle between the target fracture surface and the horizontal well trajectory, obtain the positional relationship between the target fracture surface and the core, and determine the dip and dip angle of the target fracture surface. The measurement of the target fracture surface to obtain the angle between the target fracture surface and the horizontal well trajectory is specifically as follows: Measure the target fracture surface and obtain the maximum or minimum extreme value H of the intersection depth between the fracture surface and the upper semicircle of the core. 1t The maximum or minimum extreme value H of the intersection depth between the crack surface and the lower semicircle. 1b ; Based on the maximum or minimum extreme value H of the intersection depth between the fracture surface and the upper semicircle of the core. 1t The maximum or minimum extreme value H of the intersection depth between the crack surface and the lower semicircle. 1b Obtain the angle α1 between the target fracture surface and the horizontal well trajectory; α1=atan(2r / (H 1t -H 1b )) / π*180; Where r is the core radius, H 1-t H represents the maximum or minimum depth at which the fracture surface intersects the upper semicircle of the core. 1-b This represents the maximum or minimum extreme value of the intersection depth between the crack surface and the lower semicircle.

[0034] The positional relationship between the target fracture surface and the core is obtained based on the angle between the target fracture surface and the horizontal well trajectory, and the dip and dip angle of the target fracture surface are determined, specifically as follows: When the target fracture surface is perpendicular to the horizontal well trajectory, that is, when the minimum or maximum value of the intersection between the target fracture surface and the core is at the 0° phase position, the angle between the target fracture surface and the horizontal well trajectory is α1, and the dip angle β of the fracture surface is the same as the azimuth angle β0 of the horizontal well trajectory.

[0035] When the target fracture surface is not perpendicular to the horizontal well trajectory, that is, when the minimum or maximum value of the intersection between the target fracture surface and the core is not at the 0° phase position, the deflection arc length L of the target fracture surface is measured, and the angle β1 corresponding to the deflection arc length L is β1 = (L / 2πr) * 360; where r is the core radius.

[0036] S3. Restore the dip and dip angle of the target fracture surface to the formation conditions, and determine the dip angle and dip of the target fracture surface under the formation conditions.

[0037] The process of restoring the dip and dip angle of the target fracture surface to the formation conditions, and determining the dip angle and dip of the target fracture surface under the formation conditions, specifically involves: When H 1t >H 1bAt that time, based on the wellbore inclination of the horizontal well core, the angle between the core bedding fracture or crack and the bottom of the core is the angle α1 between the target fracture surface and the horizontal well trajectory. The dip and dip angle of the target fracture surface are restored to the formation conditions, and the dip angle of the target fracture surface under the formation conditions is determined as α = α0 + α1 - 90°; the fracture surface dip angle β = β0 + β1; where a0 is the trajectory dip angle, β0 is the angle between the trajectory and true north, and H 1-t H represents the maximum or minimum depth at which the fracture surface intersects the upper semicircle of the core. 1-b This represents the maximum or minimum extreme value of the intersection depth between the crack surface and the lower semicircle.

[0038] When H 1t <H 1b At that time, based on the wellbore inclination of the horizontal well core, the angle between the core bedding fracture or crack and the bottom of the core is the angle α1 between the target fracture surface and the horizontal well trajectory. The dip and dip angle of the target fracture surface are restored to the formation conditions, and the dip angle of the target fracture surface under the formation conditions is determined as α = α0 + 90 - |(atan(2r / (H)| ... 1t -H 1b )))|,crack surface dip angle β=β0+β1; where a0 is the trajectory dip angle, H 1-t H represents the maximum or minimum depth at which the fracture surface intersects the upper semicircle of the core. 1-b β0 represents the maximum or minimum extreme value of the intersection depth between the crack surface and the lower semicircle, r is the core radius, β0 is the angle between the trajectory and the due north direction, and β1 is the angle corresponding to the deflection arc length L.

[0039] The method is described in detail below: Step 1: Place the horizontal well core horizontally on the observation platform, such as... Figure 2 As shown, record the well depth direction, determine the top and bottom directions, draw a line directly above the horizontal well core with the arrow pointing in the direction of increasing well depth, mark it as 0° phase, and measure the core diameter 2r; Step 2: Mark the crack surfaces appearing on the core with serial numbers F1, F2...F n And determine the target crack surface; Step 3: Measure the target crack surface and record the top 0° phase depth H. 1-0 The maximum or minimum extreme value H of the intersection depth between the fracture surface and the upper semicircle of the core. 1t The extreme value H of the intersection depth with the lower semicircle. 1b , Step 4: Based on H 1t and H 1b Determine the depth H1 of the center point and the angle α1 between the target fracture surface and the horizontal well trajectory: H1=(H 1t +H 1b ) / 2;tan(α1)=2r / (H1t -H 1b ) ; a1 = atan (2r / (H 1t -H 1b ) ) / p * 180; Wherein, a1 is the angle between the fracture surface and the core axis, r is the core radius, A point is the minimum value of the depth of the intersection between the fracture surface and the core, H 1-t is the corresponding depth of the point, H 1-b is the maximum depth point of the fracture surface, H1 is the depth of the center point of the fracture surface, L is the deflection arc length, beta is the inclination angle of the fracture surface, beta0 is the angle between the trajectory and the north direction, a0 is the trajectory inclination angle.

[0040] Step 5: based on the position relationship between the target fracture surface and the core, the inclination and the inclination angle of the target fracture surface in the observation platform state are determined. Step 6: according to the inclination of the horizontal well core, the angle between the core bedding seam or fracture and the core bottom is a1, the inclination and the inclination angle of the target fracture surface are restored to the formation condition, and the inclination angle alpha and the inclination beta of the target fracture surface in the formation condition are determined.

[0041] In addition, it is worth noting that all the inclination and inclination of the fracture surface appearing on the core can be calculated by repeating steps 3, 4, 5 and 6.

[0042] Step 5 and step 6 have the following implementation ways: Way 1: Step 5: when the target fracture surface is perpendicular to the horizontal well trajectory, that is, the minimum or maximum value of the intersection between the target fracture surface and the core is at 0° phase position, the angle between the target fracture surface and the horizontal well trajectory is a1, and the inclination of the fracture surface is the same as the azimuth angle of the horizontal well trajectory, that is, beta = beta0. Step 6: when H 1t >H 1b , according to the inclination of the horizontal well core, the angle between the core bedding seam or fracture and the core bottom is a1, the inclination and the inclination angle of the target fracture surface are restored to the formation condition, and the inclination angle alpha and the inclination beta of the target fracture surface in the formation condition are determined, wherein alpha = alpha0 + alpha1- 90; the inclination of the fracture surface is beta, beta = beta0 + beta1.

[0043] Way 2: Step 5: when the target fracture surface is perpendicular to the horizontal well trajectory, that is, the minimum or maximum value of the intersection between the target fracture surface and the core is at 0° phase position, the angle between the target fracture surface and the horizontal well trajectory is a1, and the inclination of the fracture surface is the same as the azimuth angle of the horizontal well trajectory, that is, beta = beta0. Step 6: when H 1t <H 1bAt that time, based on the well inclination of the horizontal well core, the angle between the core bedding fracture or crack and the bottom of the core is α1. The dip and dip angle of the target fracture surface are restored to the formation conditions to determine the dip angle α and dip β of the target fracture surface under the formation conditions, where α = α0 + 90 - |(atan(2r / (H)| ... 1t -H 1b )))|, the crack surface dips to β, β=β0+β1.

[0044] Method 3: Step 5: When the target fracture surface is not perpendicular to the horizontal well trajectory, that is, when the minimum or maximum value of the intersection between the target fracture surface and the core is not at the 0° phase position, it is necessary to measure the deflection arc length L of the target fracture surface. The angle corresponding to the arc length L is β1, β1 = (L / 2πr) * 360. Step 6: When H 1t >H 1b At that time, based on the well inclination of the horizontal well core, the angle between the core bedding fracture or crack and the bottom of the core is a1. The dip and dip angle of the target fracture surface are restored to the formation conditions, and the dip angle α and dip β of the target fracture surface under the formation conditions are determined, where α=α0+α1-90, the dip of the fracture surface is β, and β=β0+β1.

[0045] Method 4: Step 5: When the target fracture surface is not perpendicular to the horizontal well trajectory, i.e., when the minimum or maximum value of the intersection between the target fracture surface and the core is not at the 0° phase position, it is necessary to measure the deflection arc length L of the target fracture surface. The angle corresponding to the arc length L is β1, β1 = (L / 2πr) * 360; Figure 4 The diagram shown illustrates the measurement of deflection arc length.

[0046] Step 6: When H 1t <H 1b At that time, based on the well inclination of the horizontal well core, the angle between the core bedding fracture or crack and the bottom of the core is α1. The dip and dip angle of the target fracture surface are restored to the formation conditions to determine the dip angle α and dip β of the target fracture surface under the formation conditions, where α = α0 + 90 - |(atan(2r / (H)| ... 1t -H 1b )))|, the crack surface dips to β, β=β0+β1.

[0047] The following description uses examples: The first scenario: When the target fracture surface is perpendicular to the horizontal well trajectory, i.e., the deflection arc length is 0, and H... 1t <H 1b hour, Figure 5 This paper presents a schematic diagram of the first method for calculating the dip angle of core fractures under restored formation conditions.

[0048] like Figure 5The fracture F, the unfolding surface is as shown in Figure 3 The fracture F1 surface is shown in the F1 layer, the A well is a coring horizontal well, and the fracture F1 needs to be measured for the dip angle. It has been found that the trajectory dip angle of this section is 76.64°, and the trajectory azimuth angle is 347.15°. The related data are shown in Table 1.

[0049] S1: Place the core horizontally, find the top and bottom surfaces, draw a line on the top surface, and mark it as 0 degrees. Measure 2r=0.1m.

[0050] S2: Find the fracture surface F1 to be measured.

[0051] S3: Measure the fracture surface F1. The fracture top is 0 degrees, H 1t =1801.39m, H 1t =H 1-0 , H 1b =1801.426m; S4: Calculate tan(α1)=2r / (H 1t -H 1b )=0.1 / (1801.39-1801.426)=-2.777 α1=atan(-2.777) / pi()*180=-70.2° S5: The dip angle is restored to the formation condition. Since H 1t <H 1b , α=90-(α0+α1)=90-(76.64-70.2)=83.56° S6: The fracture surface is oblique to the core column, and the top is the minimum value, H 1-0 =H 1t , the deflection arc length L=0, β1=(L / 2πr)*360=0 The fracture surface dip is β=β0+β1=347.15° Thus, the dip angle of the fracture F1 is measured as α=83.56°, and the dip is β=347.15° The second case: when the target fracture surface is perpendicular to the horizontal well trajectory, and H 2t> H 2b , Figure 6 A second calculation diagram of the core fracture dip angle restored to the formation condition is shown. As shown in Figure 6 the unfolding surface is as shown in Figure 3 the F2 layering fracture, the A well is a coring horizontal well, and F2 is a layering fracture. The fracture F2 needs to be measured for the dip angle. The measurement method is the same as that of the fracturing fracture. It has been found that the trajectory dip angle of this section is 78.12°, and the trajectory azimuth angle is 347.15°. The related data are shown in Table 1.

[0052] S1: Place the core horizontally, find the top and bottom surfaces, draw a line on the top surface, mark it as 0 degrees, and measure 2r = 0.1 m.

[0053] S2: Find the fracture surface F2; S3: Measure the fracture surface F2, F2 is a bedding fracture, H 2t = 2026.485 m, H 2b = 2026.078 m, H 2t > H 2b ; S4: Calculate tan(α2) = 2r / (H 2t -H 2b ) = 0.1 / (2026.485 - 2026.078) = 0.2457 α2 = atan(0.457) / pi() * 180 = 13.8° S5: The dip angle is restored to the formation condition: α = (α0 + α2) - 90 = (78.12 + 13.8) - 90 = 1.92° S6: The fracture surface is oblique to the core column, with the maximum value at the top, and the deflection arc length L = πr, β2 = (L / 2πr) * 360 = 180° The fracture surface is inclined at β = β0 + β2 - 360 = 167.15° Thus, the dip angle of the bedding fracture F2 is α = 1.92°, and the inclination is β = 167.15° It should be noted that if only depth data is measured, the difference between the minimum value and the 0 degree position velocity is small, and the data measurement error has a large effect on the result, so the arc length measurement data is more accurate.

[0054] Third case: when the target fracture surface is not perpendicular to the horizontal well trajectory, and H 3t <H 3b , Figure 7 The core column surface scanning and fracture measurement schematic is shown in Figure 7 , Well A is a coring horizontal well, and the inclination and dip angle of the fracture F3 need to be measured. The trajectory dip angle of this section is 78.12°, and the trajectory azimuth angle is 347.15°. The core 360 degree scanning photo is used for measurement, the upper part of the fracture surface F3 is 34.6 cm from the top, the bottom is the maximum depth of 36.1 cm from the single block top, the deflection arc length is 3.2 cm, and the top depth h0 = 1865 m is obtained from the single block depth record. Thus, the dip angle is 86.65 degrees, and the inclination is 5.48 degrees (α = 86.65°, β = 5.48°). Figure 5

[0055] Table 1 is the measurement data table ​

[0056] Example 2 This invention proposes a system for measuring the dip and inclination of fractures in rock cores, such as... Figure 8 As shown, it includes: A fracture acquisition module is used to mark fracture surfaces appearing in the core of a horizontal well to be tested and to determine the target fracture surface. The fracture calculation module is used to measure the target fracture surface, obtain the angle between the target fracture surface and the horizontal well trajectory, obtain the positional relationship between the target fracture surface and the core based on the angle between the target fracture surface and the horizontal well trajectory, and determine the dip and dip angle of the target fracture surface. The measurement of the target fracture surface to obtain the angle between the target fracture surface and the horizontal well trajectory is specifically as follows: Measure the target fracture surface and obtain the maximum or minimum extreme value H of the intersection depth between the fracture surface and the upper semicircle of the core. 1t The maximum or minimum extreme value H of the intersection depth between the crack surface and the lower semicircle. 1b ; Based on the maximum or minimum extreme value H of the intersection depth between the fracture surface and the upper semicircle of the core. 1t The maximum or minimum extreme value H of the intersection depth between the crack surface and the lower semicircle. 1b Obtain the angle α1 between the target fracture surface and the horizontal well trajectory; α1=atan(2r / (H 1t -H 1b )) / π*180; Where r is the core radius, H 1-t H represents the maximum or minimum depth at which the fracture surface intersects the upper semicircle of the core. 1-b This represents the maximum or minimum extreme value of the intersection depth between the crack surface and the lower semicircle.

[0057] The positional relationship between the target fracture surface and the core is obtained based on the angle between the target fracture surface and the horizontal well trajectory, and the dip and dip angle of the target fracture surface are determined, specifically as follows: When the target fracture surface is perpendicular to the horizontal well trajectory, that is, when the minimum or maximum value of the intersection between the target fracture surface and the core is at the 0° phase position, the angle between the target fracture surface and the horizontal well trajectory is α1, and the dip angle β of the fracture surface is the same as the azimuth angle β0 of the horizontal well trajectory.

[0058] When the target fracture surface is not perpendicular to the horizontal well trajectory, that is, when the minimum or maximum value of the intersection between the target fracture surface and the core is not at the 0° phase position, the deflection arc length L of the target fracture surface is measured, and the angle β1 corresponding to the deflection arc length L is β1 = (L / 2πr) * 360; where r is the core radius.

[0059] A fracture reduction module is configured to restore the dip and the inclination of a target fracture surface to a formation condition, and determine the inclination and the dip of the target fracture surface in the formation condition.

[0060] The restoration of the dip and the inclination of the target fracture surface to the formation condition and the determination of the inclination and the dip of the target fracture surface in the formation condition specifically include: When H 1t >H 1b , according to the inclination of the horizontal well core, the angle between the core bedding seam or fracture and the core bottom is the angle a1 between the target fracture surface and the horizontal well trajectory, the dip and the inclination of the target fracture surface are restored to the formation condition, the inclination of the target fracture surface in the formation condition is determined as α = α0 + α1 - 90, and the fracture surface dip angle is determined as β = β0 + β1; wherein, α0 is the trajectory inclination, β0 is the angle between the trajectory and the north direction, H 1-t is the maximum or minimum extreme value of the intersection depth of the fracture surface and the upper half circle of the core, and H 1-b is the maximum or minimum extreme value of the intersection depth of the fracture surface and the lower half circle.

[0061] When H 1t <H 1b , according to the inclination of the horizontal well core, the angle between the core bedding seam or fracture and the core bottom is the angle a1 between the target fracture surface and the horizontal well trajectory, the dip and the inclination of the target fracture surface are restored to the formation condition, the inclination of the target fracture surface in the formation condition is determined as α = α0 + 90 - |(atan(2r / (H 1t -H 1b )))|, and the fracture surface dip angle is determined as β = β0 + β1; wherein, α0 is the trajectory inclination, H 1-t is the maximum or minimum extreme value of the intersection depth of the fracture surface and the upper half circle of the core, and H 1-b is the maximum or minimum extreme value of the intersection depth of the fracture surface and the lower half circle, r is the core radius, β0 is the angle between the trajectory and the north direction, and β1 is the angle corresponding to the deflection arc length L.

[0062] Embodiment 3 As shown in Figure 9 , the application further provides an electronic device 100 for measuring the dip and the inclination of a core fracture; the electronic device 100 includes a memory 101, at least one processor 102, a computer program 103 stored in the memory 101 and executable on the at least one processor 102, and at least one communication bus 104.

[0063] The memory 101 can be used to store the computer program 103, and the processor 102 can realize the steps of the method for measuring the fracture dip and inclination of a core by running or executing the computer program stored in the memory 101 and calling the data stored in the memory 101. The memory 101 can mainly include a program storage area and a data storage area, wherein the program storage area can store an operating system, at least one application program required by a function (such as a sound playing function, an image playing function, etc.), and the like; and the data storage area can store data (such as audio data) created according to the use of the electronic device 100, etc. In addition, the memory 101 can include a non-volatile memory, such as a hard disk, a memory, a plug-in hard disk, a smart media card (SMC), a secure digital (SD) card, a flash card, at least one disk storage device, a flash memory device, or other non-volatile solid-state storage device.

[0064] The at least one processor 102 can be a central processing unit (CPU), and can also be other general-purpose processors, digital signal processors (DSPs), application specific integrated circuits (ASICs), field-programmable gate arrays (FPGAs) or other programmable logic devices, discrete gates or transistor logic devices, discrete hardware components, etc. The processor 102 can be a microprocessor or can also be any conventional processor, etc. The processor 102 is the control center of the electronic device 100, and is connected to various parts of the electronic device 100 through various interfaces and lines.

[0065] The memory 101 in the electronic device 100 stores a plurality of instructions for realizing a method for measuring the fracture dip and inclination of a core, and the processor 102 can execute the plurality of instructions to realize: marking a fracture surface of a core of a horizontal well to be measured, and determining a target fracture surface; measuring the target fracture surface, obtaining an included angle between the target fracture surface and a horizontal well trajectory, obtaining a positional relationship between the target fracture surface and the core based on the included angle between the target fracture surface and the horizontal well trajectory, and determining the dip and inclination of the target fracture surface; restoring the dip and inclination of the target fracture surface to a formation condition, and determining the dip and inclination of the target fracture surface under the formation condition.

[0066] Embodiment 4 The modules / units integrated in the electronic device 100, if implemented in the form of software functional units and sold or used as independent products, can be stored in a computer readable storage medium. Based on such understanding, all or part of the processes in the above-mentioned embodiments of the method of the present application can also be completed by computer programs instructing related hardware, and the computer programs can be stored in a computer readable storage medium. The computer programs are executed by a processor, and the steps of each method embodiment described above can be implemented. The computer programs include computer program codes, which can be in the form of source code, object code, executable files or some intermediate forms. The computer readable medium can include any entity or device capable of carrying the computer program codes, recording medium, U disk, mobile hard disk, magnetic disk, optical disk, computer memory and read-only memory (ROM).

[0067] Those skilled in the art should understand that the embodiments of the present application can be provided as a method, a system, or a computer program product. Therefore, the present application can take the form of an entirely hardware embodiment, an entirely software embodiment, or an embodiment combining software and hardware aspects. Moreover, the present application can take the form of a computer program product implemented on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, etc.) containing computer-usable program codes.

[0068] The present application is described with reference to flowcharts and / or block diagrams of the method, device (system) and computer program product according to the embodiments of the present application. It should be understood that each flow and / or block in the flowcharts and / or block diagrams, and the combination of the flows and / or blocks in the flowcharts and / or block diagrams can be implemented by computer program instructions. These computer program instructions can be provided to a general-purpose computer, a special-purpose computer, an embedded processor or other programmable data processing devices to produce a machine, so that the instructions executed by the computer or other programmable data processing devices produce a device that implements the functions specified in the flowcharts and / or block diagrams. Figure 1 The functions specified in one flow or multiple flows and / or blocks Figure 1 The device that implements the functions specified in one block or multiple blocks.

[0069] These computer program instructions can also be stored in a computer readable storage medium, which can guide the computer or other programmable data processing devices to work in a specific way, so that the instructions stored in the computer readable storage medium produce a product including instruction devices, which implement the functions specified in the flowcharts and / or block diagrams. Figure 1 The functions specified in one flow or multiple flows and / or blocks Figure 1 The device that implements the functions specified in one block or multiple blocks.

[0070] These computer program instructions can also be loaded into a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart block or blocks. Figure 1 one or more flowcharts and / or blocks Figure 1 one or more flowcharts and / or blocks

[0071] Finally, it should be noted that the above-mentioned embodiments are merely used to illustrate the technical solutions of the present application, rather than limit the technical solutions of the present application. Although the present application has been described in detail with reference to the above-mentioned embodiments, those skilled in the art should understand that the specific embodiments of the present application can be modified or replaced equivalently without departing from the spirit and scope of the present application, and any modification or equivalent replacement without departing from the spirit and scope of the present application should be covered in the protection scope of the claims of the present application.

Claims

1. A method for measuring the dip and inclination of fractures in rock cores, characterized in that, include: Mark the fracture surface that appears in the core of the horizontal well to be tested, and determine the target fracture surface; The target fracture surface is measured to obtain the angle between the target fracture surface and the horizontal well trajectory. Based on the angle between the target fracture surface and the horizontal well trajectory, the positional relationship between the target fracture surface and the core is obtained, and the dip and dip angle of the target fracture surface are determined. The dip and dip angle of the target fracture surface are restored to the formation conditions to determine the dip angle and dip of the target fracture surface under the formation conditions.

2. The method for measuring the dip and inclination of core fractures according to claim 1, characterized in that, The measurement of the target fracture surface to obtain the angle between the target fracture surface and the horizontal well trajectory is specifically as follows: Measure the target fracture surface and obtain the maximum or minimum extreme value H of the intersection depth between the fracture surface and the upper semicircle of the core. 1t The maximum or minimum extreme value H of the intersection depth between the crack surface and the lower semicircle. 1b ; Based on the maximum or minimum extreme value H of the intersection depth between the fracture surface and the upper semicircle of the core. 1t The maximum or minimum extreme value H of the intersection depth between the crack surface and the lower semicircle. 1b Obtain the angle α1 between the target fracture surface and the horizontal well trajectory; α1=atan(2r / (H 1t -H 1b )) / π*180; Where r is the core radius, H 1-t H represents the maximum or minimum depth at which the fracture surface intersects the upper semicircle of the core. 1-b This represents the maximum or minimum extreme value of the intersection depth between the crack surface and the lower semicircle.

3. The method for measuring the dip and inclination of core fractures according to claim 1, characterized in that, The positional relationship between the target fracture surface and the core is obtained based on the angle between the target fracture surface and the horizontal well trajectory, and the dip and dip angle of the target fracture surface are determined, specifically as follows: When the target fracture surface is perpendicular to the horizontal well trajectory, that is, when the minimum or maximum value of the intersection between the target fracture surface and the core is at the 0° phase position, the angle between the target fracture surface and the horizontal well trajectory is α1, and the dip angle β of the fracture surface is the same as the azimuth angle β0 of the horizontal well trajectory.

4. The method for measuring the dip and inclination of core fractures according to claim 1, characterized in that, The positional relationship between the target fracture surface and the core is obtained based on the angle between the target fracture surface and the horizontal well trajectory, and the dip and dip angle of the target fracture surface are determined, specifically as follows: When the target fracture surface is not perpendicular to the horizontal well trajectory, that is, when the minimum or maximum value of the intersection between the target fracture surface and the core is not at the 0° phase position, the deflection arc length L of the target fracture surface is measured, and the angle β1 corresponding to the deflection arc length L is β1 = (L / 2πr) * 360; where r is the core radius.

5. The method for measuring the dip and inclination of core fractures according to claim 1, characterized in that, The process of restoring the dip and dip angle of the target fracture surface to the formation conditions, and determining the dip angle and dip of the target fracture surface under the formation conditions, specifically involves: When H 1t >H 1b At that time, based on the well inclination of the horizontal well core, the angle between the core bedding fracture or crack and the bottom of the core is the angle α1 between the target fracture surface and the horizontal well trajectory. The dip and dip angle of the target fracture surface are restored to the formation conditions, and the dip angle of the target fracture surface under the formation conditions is determined as α = α0 + α1 - 90; the dip angle of the fracture surface is β = β0 + β1. Where a0 is the trajectory inclination angle, β0 is the angle between the trajectory and true north, and H 1-t H represents the maximum or minimum depth at which the fracture surface intersects the upper semicircle of the core. 1-b This represents the maximum or minimum extreme value of the intersection depth between the crack surface and the lower semicircle.

6. The method for measuring the dip and inclination of core fractures according to claim 1, characterized in that, The process of restoring the dip and dip angle of the target fracture surface to the formation conditions, and determining the dip angle and dip of the target fracture surface under the formation conditions, specifically involves: When H 1t <H 1b At that time, based on the wellbore inclination of the horizontal well core, the angle between the core bedding fracture or crack and the bottom of the core is the angle α1 between the target fracture surface and the horizontal well trajectory. The dip and dip angle of the target fracture surface are restored to the formation conditions, and the dip angle of the target fracture surface under the formation conditions is determined as α = α0 + 90 - |(atan(2r / (H)| ... 1t -H 1b )))|,crack surface dip angle β=β0+β1; Where a0 is the trajectory inclination angle, H 1-t H represents the maximum or minimum depth at which the fracture surface intersects the upper semicircle of the core. 1-b β0 represents the maximum or minimum extreme value of the intersection depth between the crack surface and the lower semicircle, r is the core radius, β0 is the angle between the trajectory and the due north direction, and β1 is the angle corresponding to the deflection arc length L.

7. A system for measuring the dip and inclination of fractures in rock cores, characterized in that, include: A fracture acquisition module is used to mark fracture surfaces appearing in the core of a horizontal well to be tested and to determine the target fracture surface. The fracture calculation module is used to measure the target fracture surface, obtain the angle between the target fracture surface and the horizontal well trajectory, obtain the positional relationship between the target fracture surface and the core based on the angle between the target fracture surface and the horizontal well trajectory, and determine the dip and dip angle of the target fracture surface. The fracture restoration module is used to restore the dip and dip angle of the target fracture surface to the formation conditions, and to determine the dip angle and dip of the target fracture surface under the formation conditions.

8. A terminal 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, it implements the steps of the method for measuring the dip and inclination of core fractures as described in any one of claims 1 to 6.

9. A computer-readable storage medium storing a computer program, characterized in that, When the computer program is executed by the processor, it implements the steps of the method for measuring the dip and inclination of core fractures as described in any one of claims 1 to 6.

10. A computer program product, comprising a computer program, characterized in that, When the computer program is executed by the processor, it implements the steps of the method for measuring the dip and inclination of core fractures as described in any one of claims 1 to 6.

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