CN110567991B - Method and device for determining micro-crack development degree of tight sandstone reservoir - Google Patents
Method and device for determining micro-crack development degree of tight sandstone reservoir Download PDFInfo
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- CN110567991B CN110567991B CN201811270483.1A CN201811270483A CN110567991B CN 110567991 B CN110567991 B CN 110567991B CN 201811270483 A CN201811270483 A CN 201811270483A CN 110567991 B CN110567991 B CN 110567991B
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Abstract
The invention discloses a method and a device for determining the microcrack development degree of a compact sandstone reservoir, and belongs to the technical field of petroleum geological exploration. The method comprises the following steps: collecting a sample from a tight sandstone reservoir, the sample having microfractures therein; acquiring a first micro-crack parameter and a second micro-crack parameter of the sample in unit area, wherein the first micro-crack parameter comprises at least one of development abundance of an oil-gas inclusion and opening degree of a micro-crack, and the second micro-crack parameter is the number of micro-crack strips; and determining the micro-fracture development degree of the compact sandstone reservoir according to the first micro-fracture parameter and the second micro-fracture parameter. The first microfracture parameter comprises at least one of development abundance of an oil-gas inclusion and opening degree of the microfractures, and the second microfracture parameter is the number of the microfractures, so that the microfracture development degree of the tight sandstone reservoir determined by combining the first microfracture parameter and the second microfracture parameter is comprehensive and has high accuracy.
Description
Technical Field
The invention relates to the technical field of petroleum geological exploration, in particular to a method and a device for determining the micro-crack development degree of a compact sandstone reservoir.
Background
The sandstone in the tight sandstone reservoir is tight, the permeability of the reservoir is low, but the tight sandstone reservoir has a certain number of microfractures, and the microfractures provide space for the storage and the flow of oil and gas in the tight sandstone reservoir. The higher the microcrack development degree of the compact sandstone reservoir, the better the ability of the compact sandstone reservoir to store oil and gas, and the better the fluidity of the stored oil and gas. Therefore, the research on the development degree of the microcracks of the compact sandstone reservoir is of great significance.
Currently, when researching the micro-fracture development degree of a tight sandstone reservoir, a sample is firstly drilled in the tight sandstone reservoir, then the sample is knocked into a plurality of fragments, one fragment is selected from the plurality of fragments, and the selected fragment is ground into a slice to be used as a sample. Then, the sample was placed under an electron microscope, and the number of microcrack stripes per unit area of the sample was observed by the electron microscope. And finally, acquiring the micro-fracture development degree corresponding to the micro-fracture number from the stored corresponding relationship between the micro-fracture number and the micro-fracture development degree as the micro-fracture development degree of the compact sandstone reservoir.
However, in the above method, the microcrack development degree of the tight sandstone reservoir is determined only according to the number of microcracks of the tight sandstone reservoir, so that the determined microcrack development degree of the tight sandstone reservoir is incomplete and has low accuracy.
Disclosure of Invention
The embodiment of the invention provides a method and a device for determining the microcrack development degree of a tight sandstone reservoir, which can solve the problems of incomplete microcrack development degree and low accuracy of the tight sandstone reservoir determined in the related technology. The technical scheme is as follows:
in one aspect, there is provided a method for determining the extent of microfracture development in tight sandstone reservoirs, the method comprising:
collecting a sample from a tight sandstone reservoir, the sample having microfractures therein;
acquiring a first micro-crack parameter and a second micro-crack parameter of the sample in unit area, wherein the first micro-crack parameter comprises at least one of development abundance of an oil-gas inclusion and opening degree of a micro-crack, and the second micro-crack parameter is the number of micro-crack strips;
and determining the micro-fracture development degree of the compact sandstone reservoir according to the first micro-fracture parameter and the second micro-fracture parameter.
Optionally, a plurality of mineral particles are contained in the sample; the acquiring of the development abundance of the oil and gas inclusion in unit area of the sample comprises:
acquiring the total number of mineral particles in unit area of the sample and the number of mineral particles containing oil and gas inclusion;
and dividing the number of the mineral particles containing the oil-gas inclusion in the unit area of the sample by the total number of the mineral particles to obtain the development abundance of the oil-gas inclusion in the unit area of the sample.
Optionally, the obtaining the opening degree of the micro cracks per unit area of the sample comprises:
obtaining the total number of oil and gas inclusions existing in at least one micro-crack on the unit area of the sample;
and dividing the total number of the oil and gas inclusions existing in the at least one microcrack by the number of the at least one microcrack to obtain the opening degree of the microcracks on the unit area of the sample.
Optionally, the determining the extent of microfracture development of the tight sandstone reservoir according to the first microfracture parameter and the second microfracture parameter includes:
multiplying the first micro-crack parameter and the second micro-crack parameter to obtain a target numerical value;
acquiring the microcrack development degree corresponding to the target value from the corresponding relation between the stored target value and the microcrack development degree;
and determining the acquired microcrack development degree as the microcrack development degree of the compact sandstone reservoir.
Optionally, after determining the extent of microcrack development of the tight sandstone reservoir according to the first microcrack parameter and the second microcrack parameter, the method further includes:
and when the micro-crack development degree of the compact sandstone reservoir is greater than or equal to the development degree threshold value, fracturing the compact sandstone reservoir.
In another aspect, there is provided an apparatus for determining a microcrack development degree of a tight sandstone reservoir, the apparatus comprising:
the acquisition module is used for acquiring a sample from a tight sandstone reservoir, wherein the sample has micro cracks;
the acquisition module is used for acquiring a first microcrack parameter and a second microcrack parameter of the sample in unit area, wherein the first microcrack parameter comprises at least one of development abundance of an oil-gas inclusion and opening degree of microcracks, and the second microcrack parameter is the number of microcracks;
and the determining module is used for determining the micro-fracture development degree of the compact sandstone reservoir according to the first micro-fracture parameter and the second micro-fracture parameter.
Optionally, a plurality of mineral particles are contained in the sample; the acquisition module includes:
the first acquisition submodule is used for acquiring the total number of mineral particles in unit area of the sample and the number of mineral particles containing oil and gas inclusion;
and the first calculation submodule is used for dividing the number of the mineral particles containing the oil and gas inclusion in the unit area of the sample by the total number of the mineral particles to obtain the development abundance of the oil and gas inclusion in the unit area of the sample.
Optionally, the obtaining module includes:
the second obtaining submodule is used for obtaining the total number of oil and gas inclusions existing in at least one microcrack in the unit area of the sample;
and the second calculation submodule is used for dividing the total number of the oil and gas inclusions existing in the at least one microcrack by the number of the at least one microcrack to obtain the opening degree of the microcracks on the unit area of the sample.
Optionally, the determining module includes:
the third calculation submodule is used for multiplying the first micro-crack parameter and the second micro-crack parameter to obtain a target numerical value;
the third acquisition submodule is used for acquiring the microcrack development degree corresponding to the target value from the corresponding relation between the stored target value and the microcrack development degree;
and the determining submodule is used for determining the acquired microcrack development degree as the microcrack development degree of the compact sandstone reservoir.
Optionally, the apparatus further comprises:
and the fracturing module is used for fracturing the tight sandstone reservoir when the development degree of the microcracks of the tight sandstone reservoir is greater than or equal to a development degree threshold value.
The technical scheme provided by the embodiment of the invention can at least bring the following beneficial effects: in the embodiment of the invention, a sample is collected from a tight sandstone reservoir, and micro cracks exist in the sample. And acquiring a first micro-fracture parameter and a second micro-fracture parameter of the sample in unit area, and determining the micro-fracture development degree of the tight sandstone reservoir according to the first micro-fracture parameter and the second micro-fracture parameter. The first microfracture parameters comprise at least one of development abundance of oil-gas inclusion and opening degree of microfractures, and the second microfracture parameters are the number of microfracture strips, so that the microfracture development degree of the tight sandstone reservoir determined by combining the first microfracture parameters and the second microfracture parameters is comprehensive, and the accuracy is high.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.
Fig. 1 is a flowchart of a method for determining the microcrack development degree of a tight sandstone reservoir according to an embodiment of the present invention;
fig. 2 is a flow chart of another method for determining the micro-fracture development degree of a tight sandstone reservoir according to the embodiment of the invention;
fig. 3 is a schematic structural diagram of a device for determining the development degree of microfractures in a tight sandstone reservoir according to an embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, embodiments of the present invention will be described in detail with reference to the accompanying drawings.
Fig. 1 is a flowchart of a method for determining the development degree of microfractures of a tight sandstone reservoir according to an embodiment of the present invention. Referring to fig. 1, the method includes:
step 101: a sample is taken from a tight sandstone reservoir, with microfractures present in the sample.
Step 102: and acquiring a first micro-crack parameter and a second micro-crack parameter of the sample in unit area, wherein the first micro-crack parameter comprises at least one of development abundance of the oil-gas inclusion and opening degree of the micro-crack, and the second micro-crack parameter is the number of the micro-crack.
Step 103: and determining the micro-fracture development degree of the compact sandstone reservoir according to the first micro-fracture parameter and the second micro-fracture parameter.
In the embodiment of the invention, a sample is collected from a tight sandstone reservoir, and micro cracks exist in the sample. And acquiring a first micro-fracture parameter and a second micro-fracture parameter of the sample in unit area, and determining the micro-fracture development degree of the tight sandstone reservoir according to the first micro-fracture parameter and the second micro-fracture parameter. The first microfracture parameters comprise at least one of development abundance of oil-gas inclusion and opening degree of microfractures, and the second microfracture parameters are the number of microfracture strips, so that the microfracture development degree of the tight sandstone reservoir determined by combining the first microfracture parameters and the second microfracture parameters is comprehensive, and the accuracy is high.
Optionally, a plurality of mineral particles are contained in the sample; acquiring the development abundance of oil and gas inclusion in unit area of a sample, comprising:
acquiring the total number of mineral particles in unit area of a sample and the number of mineral particles containing oil and gas inclusion;
and dividing the number of the mineral particles containing the oil-gas inclusion in the unit area of the sample by the total number of the mineral particles to obtain the development abundance of the oil-gas inclusion in the unit area of the sample.
Optionally, obtaining the microcrack opening per unit area of the sample comprises:
acquiring the total number of oil and gas inclusions existing in at least one micro-crack on a unit area of a sample;
and dividing the total number of the oil and gas inclusions existing in the at least one microcrack by the number of the at least one microcrack to obtain the opening degree of the microcracks on the unit area of the sample.
Optionally, determining the extent of microfracture development of the tight sandstone reservoir according to the first microfracture parameter and the second microfracture parameter, comprising:
multiplying the first micro-crack parameter by the second micro-crack parameter to obtain a target numerical value;
acquiring the microcrack development degree corresponding to the target value from the corresponding relation between the stored target value and the microcrack development degree;
and determining the acquired microcrack development degree as the microcrack development degree of the compact sandstone reservoir.
Optionally, after determining the extent of microcrack development of the tight sandstone reservoir according to the first microcrack parameter and the second microcrack parameter, the method further includes:
and when the micro-crack development degree of the compact sandstone reservoir is greater than or equal to the development degree threshold value, fracturing the compact sandstone reservoir.
All the above optional technical solutions can be combined arbitrarily to form an optional embodiment of the present invention, which is not described in detail herein.
For the convenience of understanding, the method for determining the extent of microcrack development in tight sandstone reservoirs provided in the example of fig. 1 is described in detail below with reference to fig. 2. Fig. 2 is a flowchart of a method for determining the development degree of microfractures of a tight sandstone reservoir according to an embodiment of the present invention. Referring to fig. 2, the method includes:
step 201: a sample is taken from a tight sandstone reservoir, with microfractures present in the sample.
It should be noted that there are a certain number of microcracks in the tight sandstone reservoir, and in order to research the development degree of the microcracks in the tight sandstone reservoir, a sample may be collected from the tight sandstone reservoir, and the development degree of the microcracks in the tight sandstone reservoir may be researched through the collected sample.
Alternatively, the sample may be prepared by breaking a sample drilled from a tight sandstone reservoir and then grinding to a certain specification. The sample contains a plurality of mineral particles, the mineral particles can be quartz particles and the like, one or more microcracks exist in the sample, and the microcracks existing in the sample are the microcracks existing in the mineral particles contained in the sample.
Step 202: and acquiring a first micro-crack parameter and a second micro-crack parameter of the sample in unit area, wherein the first micro-crack parameter comprises at least one of development abundance of the oil-gas inclusion and opening degree of the micro-crack, and the second micro-crack parameter is the number of the micro-crack.
The oil-gas inclusion is a micro-bubble-shaped object formed after substances such as oil, gas, water and the like enter micro cracks of the tight sandstone reservoir and are wrapped by rock components under the diagenesis of rocks in the tight sandstone reservoir. The oil and gas inclusions are located within microcracks present in the mineral particles.
In addition, the development abundance of the oil-gas inclusion is the percentage of the number of the mineral particles containing the oil-gas inclusion in the total number of the mineral particles, the more the number of the mineral particles containing the oil-gas inclusion is, the larger the development abundance of the oil-gas inclusion is, and the better the development degree of the microcrack is.
And moreover, the opening degree of the microcracks is the opening degree of the microcracks, the more the number of the oil-gas inclusion bodies in the microcracks is, the larger the opening degree of the microcracks is, and the better the development degree of the microcracks is.
Finally, the size of the unit area may be 1cm2(square centimeter) and may be 1mm2(square millimeter), etc., the size of the unit area may be determined according to the size of the sample, which is not specifically limited in the embodiment of the present invention.
The implementation process of acquiring the development abundance of the oil-gas inclusion in the unit area of the sample can be as follows: acquiring the total number of mineral particles in unit area of a sample and the number of mineral particles containing oil and gas inclusion; and dividing the number of the mineral particles containing the oil-gas inclusion in the unit area of the sample by the total number of the mineral particles to obtain the development abundance of the oil-gas inclusion in the unit area of the sample. Of course, the development abundance of the oil and gas inclusion per unit area of the sample may also be obtained in other ways, which is not limited in the embodiment of the present invention.
It should be noted that since the oil-gas inclusion is located in the microcracks existing in the mineral particles, the oil-gas inclusion can be observed under an electron microscope, and thus the mineral particles containing the oil-gas inclusion and the mineral particles not containing the oil-gas inclusion can take different forms under the electron microscope, so that the mineral particles containing the oil-gas inclusion and the mineral particles not containing the oil-gas inclusion can be distinguished by forms under the electron microscope, so that when the total number of the mineral particles per unit area of the sample and the number of the mineral particles containing the oil-gas inclusion are obtained, the collected sample can be observed under the electron microscope, the mineral particles containing the oil-gas inclusion and the mineral particles not containing the oil-gas inclusion within the field of view (within the range observable under the electron microscope) can be distinguished by forms, and the total number of the mineral particles within the field of view and the number of the mineral particles containing the oil-gas inclusion are recorded separately, and then dividing the recorded total number of the mineral particles and the number of the mineral particles containing the oil-gas inclusion by a proportionality coefficient respectively to obtain the total number of the mineral particles in a unit area and the number of the mineral particles containing the oil-gas inclusion in the unit area, wherein the proportionality coefficient is obtained by dividing the view field size of the sample under an electron microscope by the size of the unit area.
Moreover, the oil-gas inclusion can show blue-white fluorescence or yellow-orange fluorescence under a fluorescence microscope, so that when the number of the mineral particles containing the oil-gas inclusion is obtained, a sample can be placed under the fluorescence microscope for observation, and the number of the mineral particles showing blue-white fluorescence and yellow-orange fluorescence is recorded as the number of the mineral particles containing the oil-gas inclusion, so that the number of the mineral particles containing the oil-gas inclusion can be conveniently and accurately recorded, and the accuracy of the development abundance of the oil-gas inclusion on the unit area of the obtained sample can be improved.
The realization process of the opening degree of the micro-cracks in the unit area of the obtained sample can be as follows: acquiring the total number of oil and gas inclusions existing in at least one micro-crack on a unit area of a sample; and dividing the total number of the oil and gas inclusions existing in the at least one microcrack by the number of the at least one microcrack to obtain the opening degree of the microcracks on the unit area of the sample. Of course, the opening degree of the micro cracks per unit area of the sample may be obtained in other manners, which is not limited in the embodiment of the present invention.
It should be noted that the total number of oil and gas inclusions existing in the at least one microcrack can be observed by placing the sample under an electron microscope or a fluorescence microscope, and the specific operation can be similar to the above operation of obtaining the number of mineral particles containing oil and gas inclusions per unit area of the sample, and is not described in detail here.
In addition, the number of the at least one microcrack can be observed after the sample is placed under an electron microscope.
Step 203: and determining the micro-fracture development degree of the compact sandstone reservoir according to the first micro-fracture parameter and the second micro-fracture parameter.
Specifically, the implementation process of step 203 may be: multiplying the first micro-crack parameter by the second micro-crack parameter to obtain a target numerical value; acquiring the microcrack development degree corresponding to the target value from the corresponding relation between the stored target value and the microcrack development degree; and determining the acquired microcrack development degree as the microcrack development degree of the compact sandstone reservoir.
It should be noted that, since the first microcrack parameter may include at least one of the development abundance of the oil and gas inclusion and the opening degree of the microcracks, and the second microcrack parameter is the number of microcracks, when the first microcrack parameter includes the development abundance of the oil and gas inclusion, the first microcrack parameter is multiplied by the second microcrack parameter, and in fact, the development abundance of the oil and gas inclusion is multiplied by the number of microcracks; multiplying the first microcrack parameter by the second microcrack parameter when the first microcrack parameter comprises a microcrack opening, in fact multiplying the microcrack opening by the number of microcracks; and when the first microcrack parameter comprises the oil and gas inclusion development abundance and the microcrack opening degree, multiplying the first microcrack parameter by the second microcrack parameter, and actually multiplying the oil and gas inclusion development abundance, the microcrack opening degree and the number of microcracks.
In addition, the correspondence between the target value and the extent of microcrack development may be set in advance. The extent of microcrack development can include the level of microcrack development (I, II, III, etc.) and how well (good, better, worse, etc.) the microcrack development is. Table 1 shows a correspondence between one target value and the extent of microcrack development. Assuming that the obtained target value is "40", in this case, the microcrack development grade corresponding to "40" is "II", and it is "better" if the microcrack development is good or bad, which is obtained from Table 1. Then "grade II" and "better" can be determined as the extent of microfracture development of the tight sandstone reservoir.
TABLE 1
In the present embodiment, only the correspondence between the target values and the microcrack growth degrees shown in table 1 is taken as an example for explanation, and table 1 is not intended to limit the present embodiment.
It is worth explaining that the first microfracture parameter includes at least one of development abundance of oil and gas inclusion and opening degree of microfracture, and the second microfracture parameter is number of microfracture strips, in the embodiment of the invention, the microfracture development degree of the tight sandstone reservoir is determined by combining the first microfracture parameter and the second microfracture parameter, and is not determined according to the number of the microfracture strips, so that the microfracture development degree of the tight sandstone reservoir determined in the embodiment of the invention is more comprehensive and has higher accuracy.
After determining the extent of microfracture development of the tight sandstone reservoir through steps 201 through 203 described above, it may be determined whether to fracture the tight sandstone reservoir through step 204 as follows.
Step 204: and when the micro-crack development degree of the compact sandstone reservoir is greater than or equal to the development degree threshold value, fracturing the compact sandstone reservoir.
And further, when the fracture development degree of the compact sandstone reservoir is smaller than the development degree threshold value, the compact sandstone reservoir is not fractured.
It should be noted that fracturing the tight sandstone reservoir can extend the original microcracks in the tight sandstone reservoir and improve the development degree of the microcracks, so that the capacity of the tight sandstone reservoir for storing oil gas can be improved, and the fluidity of the stored oil gas can be improved. The higher the development degree of the original microcracks in the compact sandstone reservoir, the higher the economic benefit generated after fracturing the compact sandstone reservoir, so that whether fracturing is necessary to the compact sandstone reservoir can be judged according to the development degree of the microcracks in the compact sandstone reservoir.
In addition, a development degree threshold value can be preset, and the development degree threshold value can be determined according to economic benefits brought by fracturing a compact sandstone reservoir. For example, the threshold development degree may be class II and/or better, and assuming that the microcrack development degree of the tight sandstone reservoir determined by step 203 is "class II" and/or "better," the tight sandstone reservoir may be fractured because the microcrack development degree of the tight sandstone reservoir and the threshold development degree are equal.
In the embodiment of the invention, a sample is collected from a tight sandstone reservoir, and micro cracks exist in the sample. And acquiring a first micro-fracture parameter and a second micro-fracture parameter of the sample in unit area, and determining the micro-fracture development degree of the tight sandstone reservoir according to the first micro-fracture parameter and the second micro-fracture parameter. The first microfracture parameters comprise at least one of development abundance of oil-gas inclusion and opening degree of microfractures, and the second microfracture parameters are the number of microfracture strips, so that the microfracture development degree of the tight sandstone reservoir determined by combining the first microfracture parameters and the second microfracture parameters is comprehensive, and the accuracy is high. In addition, when the micro-crack development degree of the compact sandstone reservoir is greater than or equal to the development degree threshold value, the compact sandstone reservoir can be fractured.
Fig. 3 is a schematic structural diagram of a device for determining the development degree of microfractures in a tight sandstone reservoir according to an embodiment of the present invention. Referring to fig. 3, the apparatus includes: an acquisition module 301, an acquisition module 302, and a determination module 303.
The acquisition module 301 is used for acquiring a sample from a tight sandstone reservoir, wherein the sample has micro cracks;
the acquisition module 302 is configured to acquire a first microcrack parameter and a second microcrack parameter of a sample in a unit area, where the first microcrack parameter includes at least one of development abundance of an oil-gas inclusion and opening degree of microcracks, and the second microcrack parameter is the number of microcracks;
and the determining module 303 is configured to determine the microcrack development degree of the tight sandstone reservoir according to the first microcrack parameter and the second microcrack parameter.
Optionally, a plurality of mineral particles are contained in the sample; an obtaining module 302, comprising:
the first acquisition submodule is used for acquiring the total number of mineral particles in unit area of a sample and the number of mineral particles containing oil-gas inclusion;
and the first calculation submodule is used for dividing the number of the mineral particles containing the oil-gas inclusion in the unit area of the sample by the total number of the mineral particles to obtain the development abundance of the oil-gas inclusion in the unit area of the sample.
Optionally, the obtaining module 302 includes:
the second obtaining submodule is used for obtaining the total number of the oil-gas inclusion bodies existing in at least one microcrack in the unit area of the sample;
and the second calculation submodule is used for dividing the total number of the oil and gas inclusions existing in the at least one microcrack by the number of the at least one microcrack to obtain the opening degree of the microcracks on the unit area of the sample.
Optionally, the determining module 303 includes:
the third calculation submodule is used for multiplying the first micro-crack parameter and the second micro-crack parameter to obtain a target numerical value;
the third acquisition submodule is used for acquiring the microcrack development degree corresponding to the target value from the corresponding relation between the stored target value and the microcrack development degree;
and the determining submodule is used for determining the acquired microcrack development degree as the microcrack development degree of the compact sandstone reservoir.
Optionally, the apparatus further comprises:
and the fracturing module is used for fracturing the compact sandstone reservoir when the development degree of the microcracks of the compact sandstone reservoir is greater than or equal to the development degree threshold value.
In the embodiment of the invention, a sample is collected from a tight sandstone reservoir, and micro cracks exist in the sample. And acquiring a first micro-fracture parameter and a second micro-fracture parameter of the sample in unit area, and determining the micro-fracture development degree of the tight sandstone reservoir according to the first micro-fracture parameter and the second micro-fracture parameter. The first microfracture parameters comprise at least one of development abundance of oil-gas inclusion and opening degree of microfractures, and the second microfracture parameters are the number of microfracture strips, so that the microfracture development degree of the tight sandstone reservoir determined by combining the first microfracture parameters and the second microfracture parameters is comprehensive, and the accuracy is high.
It should be noted that: the device for determining the microcrack development degree of a tight sandstone reservoir provided in the above embodiment is only illustrated by the division of the above functional modules when determining the microcrack development degree of the tight sandstone reservoir, and in practical applications, the function distribution may be completed by different functional modules as needed, that is, the internal structure of the device may be divided into different functional modules to complete all or part of the functions described above. In addition, the device for determining the microcrack development degree of the tight sandstone reservoir and the method for determining the microcrack development degree of the tight sandstone reservoir provided by the embodiments belong to the same concept, and the specific implementation process is described in the method embodiments and is not described herein again.
It will be understood by those skilled in the art that all or part of the steps of implementing the above embodiments may be implemented by hardware, or may be implemented by a program instructing relevant hardware, and the program may be stored in a computer-readable storage medium, and the above-mentioned storage medium may be a read-only memory, a magnetic disk or an optical disk, etc.
The present invention is not limited to the above preferred embodiments, and any modifications, equivalent replacements, improvements, etc. within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (6)
1. A method for determining the development degree of microcracks in a tight sandstone reservoir, which is characterized by comprising the following steps:
collecting a sample from a tight sandstone reservoir, the sample having microfractures therein;
acquiring a first micro-crack parameter and a second micro-crack parameter of the sample in unit area, wherein the first micro-crack parameter comprises at least one of development abundance of an oil-gas inclusion and opening degree of a micro-crack, and the second micro-crack parameter is the number of micro-crack strips; wherein the obtaining the microcrack opening per unit area of the sample comprises: obtaining the total number of oil and gas inclusions existing in at least one micro-crack on the unit area of the sample; dividing the total number of the oil and gas inclusions existing in the at least one microcrack by the number of the at least one microcrack to obtain the opening degree of the microcracks on the unit area of the sample;
multiplying the first micro-crack parameter and the second micro-crack parameter to obtain a target numerical value; acquiring the microcrack development degree corresponding to the target value from the corresponding relation between the stored target value and the microcrack development degree; and determining the acquired microcrack development degree as the microcrack development degree of the compact sandstone reservoir.
2. The method of claim 1, wherein the sample comprises a plurality of mineral particles; the acquiring of the development abundance of the oil and gas inclusion in unit area of the sample comprises:
acquiring the total number of mineral particles in unit area of the sample and the number of mineral particles containing oil and gas inclusion;
and dividing the number of the mineral particles containing the oil-gas inclusion in the unit area of the sample by the total number of the mineral particles to obtain the development abundance of the oil-gas inclusion in the unit area of the sample.
3. The method of any of claims 1-2, wherein after obtaining the extent of microcrack development for the target value, the method further comprises:
and when the micro-crack development degree of the compact sandstone reservoir is greater than or equal to the development degree threshold value, fracturing the compact sandstone reservoir.
4. An apparatus for determining the extent of microfracture development in tight sandstone reservoirs, the apparatus comprising:
the acquisition module is used for acquiring a sample from a tight sandstone reservoir, wherein the sample has micro cracks;
the acquisition module is used for acquiring a first microcrack parameter and a second microcrack parameter of the sample in unit area, wherein the first microcrack parameter comprises at least one of development abundance of an oil-gas inclusion and opening degree of microcracks, and the second microcrack parameter is the number of microcracks; wherein the acquisition module comprises: the second obtaining submodule is used for obtaining the total number of oil and gas inclusions existing in at least one microcrack in the unit area of the sample; the second calculation submodule is used for dividing the total number of the oil and gas inclusions existing in the at least one microcrack by the number of the at least one microcrack to obtain the opening degree of the microcracks on the unit area of the sample;
the third calculation submodule is used for multiplying the first micro-crack parameter and the second micro-crack parameter to obtain a target numerical value; the third acquisition submodule is used for acquiring the microcrack development degree corresponding to the target value from the corresponding relation between the stored target value and the microcrack development degree; and the determining submodule is used for determining the acquired microcrack development degree as the microcrack development degree of the compact sandstone reservoir.
5. The apparatus of claim 4, wherein the sample comprises a plurality of mineral particles; the acquisition module includes:
the first acquisition submodule is used for acquiring the total number of mineral particles in unit area of the sample and the number of mineral particles containing oil and gas inclusion;
and the first calculation submodule is used for dividing the number of the mineral particles containing the oil and gas inclusion in the unit area of the sample by the total number of the mineral particles to obtain the development abundance of the oil and gas inclusion in the unit area of the sample.
6. The apparatus of any of claims 4-5, wherein the apparatus further comprises:
and the fracturing module is used for fracturing the tight sandstone reservoir when the development degree of the microcracks of the tight sandstone reservoir is greater than or equal to a development degree threshold value.
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