CN108204233B - Method and device for acquiring type of shale gas - Google Patents
Method and device for acquiring type of shale gas Download PDFInfo
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- CN108204233B CN108204233B CN201711384255.2A CN201711384255A CN108204233B CN 108204233 B CN108204233 B CN 108204233B CN 201711384255 A CN201711384255 A CN 201711384255A CN 108204233 B CN108204233 B CN 108204233B
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B49/00—Testing the nature of borehole walls; Formation testing; Methods or apparatus for obtaining samples of soil or well fluids, specially adapted to earth drilling or wells
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- Environmental & Geological Engineering (AREA)
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Abstract
The embodiment of the application provides a method and a device for obtaining the type of shale gas, wherein the method comprises the following steps: obtaining at least two attributes of shale which can be used for evaluating the type of shale gas, wherein the at least two attributes comprise a first attribute and a second attribute; the shale is shale generated by shale gas; determining a target area of the shale gas on the shale gas classification chart according to at least two attributes, wherein the target area is used for indicating the type of the shale gas; the shale gas classification diagram is obtained by at least integrating the relationship between the first attribute and the type of the shale gas and the relationship between the second attribute and the type of the shale gas. The shale gas type obtained by the embodiment of the application can show the characteristics of the shale gas in various aspects, so that the exploration and development of the shale gas are effectively guided, and the acquisition process is simple and rapid.
Description
Technical Field
The application relates to unconventional oil and gas resource development technologies, in particular to a method and a device for obtaining types of shale gas.
Background
Theories and practices prove that the formation, distribution and enrichment of shale gas are closely related to the type of the shale gas, for example, coal type shale gas (the matrix type of gas-producing shale corresponding to the coal type shale gas is type III kerogen) is mainly distributed and enriched in a marsh phase basin, and oil type shale gas (the matrix type of gas-producing shale corresponding to the oil type shale gas is type I and type II kerogen) is mainly distributed and enriched in a lake phase basin. Before the development of the shale gas, the fact that the type of the shale gas to be searched is determined in advance has important significance.
At present, there are many schemes for determining the type of shale gas, and there are also many types of shale gas determined, such as: (1) according to the organic matter type of the gas-producing shale, the gas can be divided into two main types of oil type shale gas and coal type shale gas; (2) according to the type of gas-producing shale substances, the gas-producing shale can be divided into direct shale gas formed by direct pyrolysis of kerogen and indirect shale gas formed by thermal cracking of crude oil and asphalt; (3) according to the natural gas composition, the shale gas can be divided into three types of shale gas, namely a thermal formation type shale gas, a biological formation type shale gas and a mixed shale gas; and so on.
However, the type of the shale gas obtained by adopting the classification scheme has certain one-sidedness, so that the characteristics of the shale gas cannot be comprehensively displayed, and the exploration and development of the shale gas are difficult to effectively guide.
Disclosure of Invention
The embodiment of the application provides a method and a device for obtaining the type of shale gas, so as to overcome the technical problem that the type of the shale gas obtained in the prior art has certain one-sidedness, so that the characteristics of the shale gas cannot be comprehensively shown.
In a first aspect, an embodiment of the present application provides a method for obtaining a type of shale gas, including:
obtaining at least two attributes of shale which can be used for evaluating the type of shale gas, wherein the at least two attributes comprise a first attribute and a second attribute; the shale is shale in which the shale gas exists;
determining a target area corresponding to the shale gas on a shale gas classification chart according to the at least two attributes, wherein the target area is used for indicating the type of the shale gas; the shale gas classification diagram is obtained by at least integrating the relationship between the first attribute and the type of the shale gas and the relationship between the second attribute and the type of the shale gas.
In the method, if the first attribute is a matrix type, the second attribute is a formation movement of shale, and the formation movement of shale is a first formation movement, the obtaining at least two attributes of shale that can be used for evaluating a type of shale gas includes:
obtaining a matrix type of the shale;
acquiring the tectonic movement of the shale, wherein the acquired result is that the tectonic movement is a first tectonic movement;
determining a target area corresponding to the shale gas on the shale gas classification chart according to the at least two attributes, including:
and determining a target area corresponding to the shale gas on a shale gas classification chart according to the shale matrix type and the first structure motion.
In the method, if the first attribute is a matrix type, the second attribute is a tectonic movement of shale, and the tectonic movement of shale is a second tectonic movement, the obtaining at least two attributes of shale that can be used for evaluating a type of shale gas includes:
obtaining a matrix type of the shale;
acquiring the tectonic movement of the shale, wherein the acquired result is that the tectonic movement is a second tectonic movement;
obtaining vitrinite reflectivity of the shale;
determining a target area corresponding to the shale gas on the shale gas classification chart according to the at least two attributes, including:
and determining a target area corresponding to the shale gas on the shale gas classification diagram according to the shale matrix type, the second structure motion and the vitrinite reflectivity.
According to the method, if the vitrinite reflectivity of the shale is within a preset range and the matrix type is a preset matrix type, the target area indicates at least two types;
the method further comprises the following steps:
obtaining the cause of the shale gas;
according to the cause, determining a target type from the at least two types, wherein the target type is the type of the shale gas.
The method as described above, before the obtaining at least two properties of the shale that can be used for evaluating the type of shale gas, further comprising:
establishing a classification coordinate system by taking the first attribute as a vertical coordinate and at least taking the second attribute as the vertical coordinate;
and at least integrating the relationship between the type of the shale gas and the first attribute and the relationship between the type of the shale gas and the second attribute, and dividing the classification coordinate system into different areas, wherein the areas are used for indicating the type of the shale gas.
The method as described above, before the obtaining at least two properties of the shale that can be used for evaluating the type of shale gas, further comprising:
establishing a classification coordinate system by taking the matrix type as a vertical coordinate and the structure motion and the vitrinite reflectivity as a horizontal coordinate;
and dividing the classification coordinate system into different areas by integrating the relation between the type of the shale gas and the reflectivity of the vitrinite, the relation between the type of the shale gas and the type of the matrix and the relation between the type of the shale gas and the construction motion, wherein the areas are used for indicating the type of the shale gas.
The method as described above, wherein the predetermined range is 0.5% to 0.7%.
In a second aspect, an apparatus for obtaining a type of shale gas is provided in an embodiment of the present application, including:
the system comprises an obtaining module, a judging module and a judging module, wherein the obtaining module is used for obtaining at least two attributes of shale, and the at least two attributes can be used for evaluating the type of shale gas and comprise a first attribute and a second attribute; the shale is shale in which the shale gas exists;
a determining module, configured to determine, according to the at least two attributes, a target region corresponding to the shale gas on a shale gas classification map, where the target region is used to indicate a type of the shale gas; the shale gas classification diagram is obtained by at least integrating the relationship between the first attribute and the type of the shale gas and the relationship between the second attribute and the type of the shale gas.
In the above apparatus, if the first attribute is a matrix type, the second attribute is a tectonic movement of shale, and the tectonic movement of shale is a first tectonic movement, the obtaining module is specifically configured to:
obtaining a matrix type of the shale;
acquiring the tectonic movement of the shale, wherein the acquired result is that the tectonic movement is a first tectonic movement;
the determining module is specifically configured to:
and determining a target area corresponding to the shale gas on a shale gas classification chart according to the shale matrix type and the first structure motion.
In the above apparatus, if the first attribute is a matrix type, the second attribute is a tectonic movement of shale, and the tectonic movement of shale is a second tectonic movement, the obtaining module is specifically configured to:
obtaining a matrix type of the shale;
acquiring the tectonic movement of the shale, wherein the acquired result is that the tectonic movement is a second tectonic movement;
obtaining vitrinite reflectivity of the shale;
the determining module is specifically configured to:
and determining a target area corresponding to the shale gas on the shale gas classification diagram according to the shale matrix type, the second structure motion and the vitrinite reflectivity.
According to the method, the shale classification diagram is set, and the types shown on the shale classification diagram are integrated with the relationship between the attributes of the shale and the type of the shale gas, so that when the type of the shale gas is obtained, the attributes of the shale corresponding to the shale gas classification diagram can be obtained, and then the shale gas type comprehensively considering the multiple attributes of the shale can be obtained by projecting the shale gas classification diagram to the shale gas classification diagram; the shale gas type comprehensively considering various attributes of shale can show the characteristics of the shale gas in various aspects, namely, the cause mechanism and the distribution enrichment characteristics of the shale gas can be associated as long as the shale gas type is known, so that the exploration and development of the shale gas can be effectively guided, and the process of obtaining the shale gas type is simple and rapid.
Drawings
In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly introduced below, and it is obvious that the drawings in the following description are some embodiments of the present application, and for those skilled in the art, other drawings can be obtained according to these drawings without inventive exercise.
FIG. 1 is a flow chart of a first embodiment of a method for obtaining a type of shale gas provided herein;
FIG. 2 is a first schematic diagram of a shale classification chart provided herein;
FIG. 3 is a second schematic view of a shale classification chart provided herein;
FIG. 4 is a flow chart of a second embodiment of a method of obtaining a type of shale gas provided herein;
FIG. 5 is a flow chart of a third embodiment of a method for obtaining a type of shale gas provided herein;
fig. 6 is a schematic structural diagram of a first embodiment of an apparatus for obtaining shale gas according to the present application.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are some embodiments of the present application, but not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
First, the related terms related to the present application will be explained.
Shale gas is a natural gas resource which is stored in shale layers and can be exploited. Compared with the conventional natural gas, the shale gas development has the advantages of long mining life and long production period, most of the gas-producing shale has wide distribution range and large thickness and generally contains gas, so that the shale gas well can produce gas at a stable rate for a long time.
Shale gas is present in shale, which is a sedimentary rock with complex composition but with lamellar or lamelliform joints, and is mainly a rock formed by clay deposition under pressure and temperature but mixed with quartz, debris of feldspar and other chemical substances. The breakable pieces are struck with a hard object. The weather resistance is weak, and the land tends to form low mountains and valleys due to erosion on the terrain. Shale is impermeable to water and tends to act as a water barrier in groundwater distribution. The silt is formed in a still water environment and is deposited for a long time, so the silt is often present in lakes and river delta lands, shale is also formed in marine continental shelves, and fossil of ancient animals and plants is also often contained in the shale.
That is, the shale gas is generated from shale and then exists in the shale, and thus, the nature of the shale determines the type of shale gas that exists inside it.
Kerogen: is dispersed organic matter insoluble in alkali, non-oxidizing acid and organic solvent in sedimentary rock (such as shale), and can generate petroleum or natural gas through biological change and/or chemical change.
Type i kerogen: (also referred to as sapropel type): the fertilizer is mainly made of lipid compounds, has a lot of straight-chain alkanes, has few polycyclic aromatic hydrocarbons and oxygen-containing functional groups, has high hydrogen and low oxygen content, can be derived from algae sediments, and can be formed by modifying various organic matters by bacteria.
Type ii kerogen: the product has high hydrogen content, slightly lower hydrogen content than type I kerogen, high saturated polycyclic carbon skeleton, high content of straight chain alkane and cyclane, polycyclic aromatic hydrocarbon and heteroatom functional group, and is derived from marine plankton and microorganism.
Type III kerogen: (also referred to as humic type): has low hydrogen content and high oxygen content, mainly contains polycyclic aromatic hydrocarbon and oxygen-containing functional groups, has little saturated hydrocarbon and is derived from plants with high land and the like.
Coal type shale gas: natural gas produced in type iii kerogen dominated shale layer series.
Oil type shale gas: natural gas from shale strata dominated by type i and type ii kerogen.
The method for obtaining shale gas of the present application is described in detail with reference to specific examples.
Fig. 1 is a flowchart of a first embodiment of a method for obtaining a type of shale gas provided by the present application, and as shown in fig. 1, the method of this embodiment may include:
s101, obtaining at least two attributes of shale, wherein the at least two attributes can be used for evaluating the type of shale gas, and the at least two attributes comprise a first attribute and a second attribute; the shale is shale generated by shale gas;
step S102, determining a target area corresponding to the shale gas on the shale gas classification chart according to at least two attributes, wherein the target area is used for indicating the type of the shale gas; the shale gas classification diagram is obtained by at least integrating the relationship between the first attribute and the type of the shale gas and the relationship between the second attribute and the type of the shale gas.
Specifically, attributes of shale that can be used to evaluate the type of shale gas include: the shale has the same matrix type, structure movement, vitrinite reflectivity and deposition.
The relationship between the individual properties and the type of shale gas is described below.
The relationship between the matrix type of shale and the type of shale gas is as follows: if the shale is of the type I kerogen or the type II kerogen, the shale gas in the shale is endowed as oil type shale gas, and if the shale is of the type III kerogen, the shale gas in the shale is endowed as coal type shale gas.
The relationship of the tectonic movement of shale to the type of shale gas: if the shale moves in a later-stage tectonic lifting mode, the shale can be leached by underground water, the cause of shale gas in the shale is given as biological decomposition, and the type of the shale gas is secondary biological shale gas.
The vitrinite reflectivity of shale is related to the type of shale gas as follows: when the reflectivity of the vitrinite is 0-0.5%, the cause of the shale gas is formed by biological decomposition, and the type of the shale gas corresponds to that of the original biological shale gas; when the reflectivity of the vitrinite is between 0.5% and 0.7%, if the cause of the shale gas in the shale is formed by biological decomposition, the type of the shale gas corresponds to the original biological shale gas, and if the cause of the shale gas in the shale is formed by thermal decomposition, the type of the shale gas corresponds to the low-temperature pyrolysis shale gas; when the vitrinite reflectivity is between 0.7% and 1.3%, the type of the shale gas corresponds to mature pyrolysis shale gas; when the vitrinite reflectivity is more than 1.3%, the type of the shale gas corresponds to the over-mature pyrolysis shale gas.
When vitrinite reflectivity is required to determine the type of shale gas, the shale moves into a configuration that has not been lifted by a later configuration. Because if the shale is lifted by the later-stage structure, the type of shale existing in the shale is secondary biological shale gas no matter what the vitrinite reflectivity of the shale is.
Before step S101, a shale gas classification map needs to be acquired. The shale gas classification map has a plurality of regions thereon, each region corresponding to at least one type of shale gas. The process of obtaining the shale gas classification map may be as follows:
(1) establishing a classification coordinate system by taking the first attribute as a vertical coordinate and at least taking the second attribute as a horizontal coordinate;
(2) and dividing the classification coordinate system into different areas according to at least the relationship between the type of the shale gas and the first attribute and the relationship between the type of the shale gas and the second attribute to obtain a shale classification chart, wherein each area at least indicates one type of the shale gas. That is, if the obtained at least two attributes are the first attribute and the second attribute, the type indicated by each region of the shale classification chart is the type obtained by integrating the relationship between the type of shale gas and the first attribute and the relationship between the type of shale gas and the second attribute.
Fig. 2 is a first schematic diagram of a shale classification diagram provided by the present application, and fig. 3 is a second schematic diagram of the shale classification diagram provided by the present application.
If the first attribute is the matrix type and the second attribute is the vitrinite reflectivity, the ordinate of the shale gas classification chart can be the matrix type, the abscissa can be the vitrinite reflectivity, and the shale classification chart is shown in fig. 2; if the first attribute is a matrix type and the second attribute is a formation motion, the ordinate of the shale gas classification chart can be the matrix type, the abscissa can be the formation motion and the vitrinite reflectivity, and the shale classification chart is shown in fig. 3.
Referring to fig. 3, if the shale is lifted by the later-stage structure and the matrix type is type iii kerogen, the type of the shale gas is secondary bio-coal type shale gas, and if the shale is lifted by the later-stage structure and the matrix type is type i kerogen or type ii kerogen, the type of the shale gas is secondary bio-oil type shale gas; if the shale is not lifted by a later-period structure, the parent substance type is type III kerogen, and the reflectivity of the vitrinite is 1.0-1.15%, the type of the shale gas is mature pyrolysis coal type shale gas; if the shale is not lifted by a later-period structure, the parent substance type is I-type kerogen, the reflectivity of the vitrinite is 1.0-1.15%, the type of the shale gas is mature pyrolysis oil type shale gas, and the like. Wherein the secondary biological coal type shale gas, the secondary biological oil type shale gas, the mature pyrolytic coal type shale gas and the mature pyrolytic oil type shale gas are all types which integrate various attributes and types of shale gas.
After the shale classification chart is obtained, the attributes of the shale to be evaluated, which are related to the shale classification chart, can be obtained, and the type of the shale gas existing in the shale to be evaluated is obtained.
When the type of shale gas existing in the actual shale to be evaluated is determined, acquiring at least two attributes of the shale to be evaluated, wherein the at least two attributes comprise a first attribute and a second attribute; then, according to the at least two attributes, a target area corresponding to the shale gas on the shale gas classification chart is determined. For example, if the first attribute is a matrix type, the matrix type is particularly type-III kerogen, the second attribute is vitrinite reflectivity, and the vitrinite reflectivity is particularly 1.0% -1.15%, determining the type-III kerogen and vitrinite reflectivity as 1.0% -1.15% in an area corresponding to the shale classification chart as a target area; at this time, the shale classification chart is, for example, the shale classification chart in fig. 2, and referring to fig. 2, it is known that the target area is an area 21 indicating mature pyrolysis coal type shale gas, and the type of shale gas occurring in the shale to be evaluated is mature pyrolysis coal type shale gas.
In this embodiment, a shale classification diagram is set, and each type shown on the shale classification diagram integrates the relationship between each attribute of shale and the type of shale gas, and when the type of shale gas is obtained, each attribute of shale corresponding to the shale gas classification diagram can be obtained, and then the obtained attribute is projected to the shale gas classification diagram, so that the type of shale gas in which various attributes of shale are comprehensively considered can be obtained; the shale gas type comprehensively considering various attributes of shale can show the characteristics of the shale gas in various aspects, namely, the cause mechanism and the distribution enrichment characteristics of the shale gas can be associated as long as the shale gas type is known, so that the exploration and development of the shale gas can be effectively guided, and the process of obtaining the shale gas type is simple and rapid.
The more the obtained shale properties or the more the shale classification chart integrates the shale properties and the shale gas types, the more abundant the shale gas types exhibit shale characteristics, and the better the guidance for exploration and development of shale gas is.
The method for obtaining the type of the shale gas comprises the following steps: obtaining at least two attributes of shale which can be used for evaluating the type of shale gas, wherein the at least two attributes comprise a first attribute and a second attribute; the shale is shale generated by shale gas; determining a target area corresponding to the shale gas on the shale gas classification diagram according to at least two attributes, wherein the target area is used for indicating the type of the shale gas; the shale gas classification diagram is obtained by at least integrating the relationship between the first attribute and the type of the shale gas and the relationship between the second attribute and the type of the shale gas. According to the method for acquiring the type of the shale gas, the acquired type of the shale gas can show the characteristics of the shale gas in various aspects, the exploration and development of the shale gas can be effectively guided, and the acquisition process is simple and rapid.
The embodiment shown in fig. 1 will be described in detail below using specific examples.
Fig. 4 is a flowchart of a second embodiment of a method for obtaining a type of shale gas, where as shown in fig. 4, the method of this embodiment may include:
step S201, obtaining a shale matrix type and shale structure motion of shale which are formed by shale gas;
step S202, if the structure movement of the shale is a first structure movement, determining a target area corresponding to shale gas on a shale gas classification diagram according to the matrix type of the shale and the first structure movement; wherein the target area is used for indicating the type of shale gas.
Specifically, the present embodiment is applicable to a scenario in which the first attribute is a matrix type, the second attribute is a formation movement, and specifically the first formation movement, and the shale gas classification map may be as shown in fig. 3. The first tectonic movement in this embodiment may be shale lifting through the post-tectonic lift.
The process of obtaining the shale gas classification chart shown in fig. 3 is as follows:
(1) establishing a classification coordinate system by taking the matrix type of the shale as a vertical coordinate and the tectonic movement of the shale and the vitrinite reflectivity as a horizontal coordinate;
(2) and dividing the classification coordinate system into different areas according to the relation between the vitrinite reflectivity and the type of the shale gas, the relation between the matrix type and the type of the shale gas and the relation between the structure movement of the shale and the type of the shale gas to obtain a shale gas classification diagram, wherein the areas on the shale gas classification diagram are used for indicating at least one type of the shale gas.
When the type of shale gas existing in the actual shale to be evaluated is determined, acquiring the matrix type and the tectonic movement of the shale to be evaluated, and if the acquired tectonic movement is a first tectonic movement: after the shale is lifted by the later-stage structure, determining a target area corresponding to the shale gas on the shale gas classification diagram directly according to the matrix type and the first structure motion; for example, if the obtained parent substance type is specifically type iii kerogen, and the structure movement is that the shale undergoes later-stage structure lifting, a region on the shale classification diagram, where the ordinate is type iii kerogen and the abscissa is that the shale undergoes later-stage structure lifting, is determined as a target region, see fig. 3, where the target region is a region 31 indicating secondary biological coal type shale gas, and the type of the shale gas generated by the shale to be evaluated is secondary biological coal type shale gas.
The embodiment determines the type of the shale gas through the matrix type and the first construction movement of the shale, and the determined type of the shale gas can show various characteristics of the shale gas.
Fig. 5 is a flowchart of a third embodiment of a method for obtaining a type of shale gas, where as shown in fig. 5, the method of this embodiment may include:
s301, acquiring a shale matrix type and shale structure motion of shale which are caused by shale gas;
step S302, if the structural movement of the shale is a second structural movement, acquiring a vitrinite reflectivity of the shale;
step S303, determining a target area corresponding to the shale gas on the shale gas classification diagram according to the matrix type of the shale, the second structure motion and the vitrinite reflectivity; wherein the target area is used for indicating the type of shale gas.
Specifically, the present embodiment is applicable to the case where the first attribute is the matrix type, the second attribute is the formation movement, and specifically the second formation movement, and the shale gas classification map may be as shown in fig. 3. The second formation movement in this embodiment may be that the shale has not been raised by the late formation.
The process of obtaining the shale gas classification chart shown in fig. 3 refers to the previous embodiment, and details are not repeated in this embodiment.
When the type of shale gas existing in the actual shale to be evaluated is determined, acquiring the matrix type and the tectonic movement of the shale to be evaluated, and if the acquired tectonic movement is a second tectonic movement: if the shale is not lifted by the later-stage structure, determining a target area corresponding to the shale gas on the shale gas classification diagram according to the type of the matrix, the second structure motion and the emittance of the vitrinite; for example, the obtained parent substance type is specifically type i kerogen, the structural movement is that shale is not lifted by a later-stage structure, and the vitrinite reflectance is 1.35% to 1.55%, a region corresponding to a shale classification chart with the ordinate of type i kerogen, the abscissa of shale not lifted by the later-stage structure and the vitrinite reflectance of 1.35% to 1.55% is determined as a target region, see fig. 3, where the target region is a region 41 corresponding to an indication of the over-cooked pyrolysis oil type shale gas, and the type of the shale gas to be evaluated is the over-cooked pyrolysis oil type shale gas.
Further, in an applicable scenario of the present implementation: if the vitrinite reflectivity of the obtained shale is within a preset range (the preset range can be 0.5% -0.7%), and the matrix type is a preset matrix type (the preset matrix type is type-III kerogen), a target area corresponding to shale gas on a shale gas classification chart determined according to the matrix type, the second structure movement and the vitrinite reflectivity indicates at least two types, because when the vitrinite reflectivity is within the preset range and the matrix type is the preset matrix type, biological coal type shale gas and pyrolytic coal type shale gas obtained by biological causes exist simultaneously. In order to determine which type of shale gas is present in the shale to be evaluated, the method further comprises: obtaining a cause of shale gas; and determining a target type from at least two types according to the cause, wherein the target type is the type of the shale gas. For example, if the matrix type is specifically type iii kerogen, the structure movement is that the shale is not lifted by the later-stage structure, the vitrinite reflectance is 0.6%, and the cause is a biological cause, a corresponding region on the shale classification chart, where the ordinate is type iii kerogen, the abscissa is that the shale is not lifted by the later-stage structure, and the vitrinite reflectance is 0.5% to 0.7%, is determined as a target region, see fig. 3, where the target region is a region 51 indicating low-maturity pyrolysis coal type shale gas and raw biological coal type shale gas, and because the cause of the shale gas is a biological cause, the type of the shale gas existing in the shale to be evaluated is raw biological coal type shale gas.
The method for obtaining the shale gas cause can sample shale gas existing in shale to be evaluated, measure carbon C isotopes and determine the cause of the shale gas according to the types of the C isotopes.
According to the embodiment, the type of the shale gas is determined through the matrix type, the second construction movement and the vitrinite reflectivity of the shale, and the determined type of the shale gas can show various characteristics of the shale gas.
The method of the embodiments of the present application is further described below with reference to application examples.
The application example is that the target layer of shale gas exploration is as follows: the upper three-fold-system long 7-section shale layer system in the underground temple bay-Fuxian region of Erdos basin in China has an area of about 2500km2Generally, lake-phase mudstones and shales (called as 'Zhangjia Tan' shales) with the thickness of 40-50 m and the maximum thickness of more than 80m are main shale-gas hydrocarbon source rocks in the area, the set of hydrocarbon source rocks are formed in a deposition environment with deeper water body, low salinity, unobvious water body layering and reduction, organic matter sources mainly comprise lake-born low-grade biological algae, kerogen types are I type and II type, the abundance of the organic matter is very high, the content of organic carbon is generally 6% -14%, and the highest content can be more than 30%. The buried depth is generally not more than 3500m, and the reflectivity R of the vitrinite isO0.7% -1.15% of the total weight of the rice is mainly in the mature stage. In the past, only the type of shale gas possibly formed by the method is known to be mature shale gas, and the cause characteristics, distribution positions and resource prospects of the shale gas cannot be correctly judged due to the fact that the shale gas is too general. Therefore, the further determination of the cause type has great significance for shale gas exploration in the region.
The gas production shale corresponding to the shale gas of the target layer of shale gas exploration is 7 sections of 'zhanjiatan' shale, according to the method for obtaining shale gas types in the previous embodiment, the matrix types of the long 7 sections of shale with the length of "zhanbei" are obtained, specifically, the type I and type II kerogen are obtained, the vitrinite reflectance Ro value of the long 7 sections of shale with the length of "zhanbei" is obtained, specifically, the vitrinite reflectance Ro value is 0.7% -1.15%, the type of the corresponding area indication of the type I and type II kerogen and vitrinite reflectance of 0.7% -1.15% on the shale gas classification chart in FIG. 3 is determined as the type of shale gas included in the target layer of exploration in the application example, it can be seen that the type i and type ii kerogen and vitrinite reflectivities are 0.7% to 1.15% and the type indicated by the corresponding area on the shale gas classification chart in fig. 3 is mature pyrolysis oil type shale gas, therefore, the shale gas type produced by the shale layer system of the 'Zhangjiatan' in the 7 th section of the experimental area is the mature pyrolysis oil type shale gas.
According to the shale gas geological theory, the mature oil type pyrolysis shale gas is mainly distributed and enriched in the center of a lake phase basin (gas production shale kerogen types are I and II) and a peripheral low slope area thereof, and the exploration and development potential is limited due to the fact that the gas production rate of the hydrocarbon source rock corresponding to the mature oil type pyrolysis shale gas is not large. At present, a plurality of shale gas exploration and development wells such as Liuping 177 wells and the like are arranged in the area, but commercial airflow is not obtained, and the fact that the exploration and development potential of shale gas in the beach shale layer series is limited is proved to be attacked in the area.
Fig. 6 is a schematic structural diagram of a first embodiment of an apparatus for obtaining shale gas according to the present application, and as shown in fig. 6, the apparatus of this embodiment may include: an acquisition module 61 and an acquisition module 62.
An obtaining module 61, configured to obtain at least two attributes of the shale, which can be used for evaluating a type of the shale gas, where the at least two attributes include a first attribute and a second attribute; the shale is shale generated by shale gas; a determining module 62, configured to determine, according to at least two attributes, a target region corresponding to the shale gas on the shale gas classification map, where the target region is used to indicate a type of the shale gas; the shale gas classification diagram is obtained by at least integrating the relationship between the first attribute and the type of the shale gas and the relationship between the second attribute and the type of the shale gas.
The obtaining module 61 is further configured to, before obtaining at least two attributes of the shale which can be used for evaluating the type of the shale gas, establish a classification coordinate system by using the first attribute as a vertical coordinate and by using at least the second attribute as a vertical coordinate; and at least integrating the relationship between the type of the shale gas and the first attribute and the relationship between the type of the shale gas and the second attribute, and dividing the classification coordinate system into different areas, wherein the areas are used for indicating the type of the shale gas.
If the first attribute is a matrix type, the second attribute is a structural movement of the shale, and the structural movement of the shale is a first structural movement, the obtaining module 61 is specifically configured to: obtaining a parent material type of the shale; acquiring the tectonic movement of the shale, wherein the acquired result is that the tectonic movement is a first tectonic movement; the determination module 62 is specifically configured to: and determining a target area corresponding to the shale gas on the shale gas classification chart according to the matrix type and the first structure motion of the shale.
If the first attribute is a matrix type, the second attribute is a structural movement of the shale, and the structural movement of the shale is a second structural movement, the obtaining module 61 is specifically configured to: obtaining a parent material type of the shale; acquiring the tectonic movement of the shale, wherein the acquired result is that the tectonic movement is a second tectonic movement; obtaining vitrinite reflectivity of shale; the determination module 62 is specifically configured to: and determining a target area corresponding to the shale gas on the shale gas classification diagram according to the shale matrix type, the second structure motion and the vitrinite reflectivity.
If the vitrinite reflectivity of the obtained shale is within the preset range and the matrix type is the preset matrix type, the target area indicates at least two types, and the obtaining module 61 is further configured to obtain the cause of the shale gas; the determining module 62 is specifically configured to determine a target type from at least two types according to the cause, where the target type is a type of shale gas.
The obtaining module 61 is further specifically configured to establish a classification coordinate system by using the matrix type as a vertical coordinate and using the structure motion and the vitrinite reflectivity as vertical coordinates; and dividing the classification coordinate system into different areas by integrating the relationship between the type of the shale gas and the reflectivity of the vitrinite, the relationship between the type of the shale gas and the type of the matrix and the relationship between the type of the shale gas and the construction motion, wherein the areas are used for indicating the type of the shale gas.
The apparatus of this embodiment may be configured to implement the technical solutions of the above method embodiments, and the implementation principles and technical effects are similar, which are not described herein again.
Those of ordinary skill in the art will understand that: all or a portion of the steps of implementing the above-described method embodiments may be performed by hardware associated with program instructions. The program may be stored in a computer-readable storage medium. When executed, the program performs steps comprising the method embodiments described above; and the aforementioned storage medium includes: various media that can store program codes, such as ROM, RAM, magnetic or optical disks.
Finally, it should be noted that: the above embodiments are only used for illustrating the technical solutions of the present application, and not for limiting the same; although the present application has been described in detail with reference to the foregoing embodiments, it should be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; and the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present application.
Claims (8)
1. A method of obtaining a type of shale gas, comprising:
obtaining at least two attributes of shale which can be used for evaluating the type of shale gas, wherein the at least two attributes comprise a first attribute and a second attribute; the shale is shale in which the shale gas exists;
determining a target area corresponding to the shale gas on a shale gas classification chart according to the at least two attributes, wherein the target area is used for indicating the type of the shale gas; the shale gas classification diagram is obtained by at least integrating the relationship between the first attribute and the type of the shale gas and the relationship between the second attribute and the type of the shale gas;
if the first attribute is a matrix type, the second attribute is a tectonic movement of shale, and the tectonic movement of shale is a first tectonic movement, then the obtaining at least two attributes of shale that can be used for evaluating the type of shale gas includes:
obtaining a matrix type of the shale;
acquiring the tectonic movement of the shale, wherein the acquired result is that the tectonic movement is a first tectonic movement;
determining a target area corresponding to the shale gas on the shale gas classification chart according to the at least two attributes, including:
and determining a target area corresponding to the shale gas on a shale gas classification chart according to the shale matrix type and the first structure motion.
2. A method of obtaining a type of shale gas, comprising:
obtaining at least two attributes of shale which can be used for evaluating the type of shale gas, wherein the at least two attributes comprise a first attribute and a second attribute; the shale is shale in which the shale gas exists;
determining a target area corresponding to the shale gas on a shale gas classification chart according to the at least two attributes, wherein the target area is used for indicating the type of the shale gas; the shale gas classification diagram is obtained by at least integrating the relationship between the first attribute and the type of the shale gas and the relationship between the second attribute and the type of the shale gas;
if the first attribute is a matrix type, the second attribute is a tectonic movement of shale, and the tectonic movement of shale is a second tectonic movement, then the obtaining at least two attributes of shale that can be used for evaluating the type of shale gas includes:
obtaining a matrix type of the shale;
acquiring the tectonic movement of the shale, wherein the acquired result is that the tectonic movement is a second tectonic movement;
obtaining vitrinite reflectivity of the shale;
determining a target area corresponding to the shale gas on the shale gas classification chart according to the at least two attributes, including:
and determining a target area corresponding to the shale gas on the shale gas classification diagram according to the shale matrix type, the second structure motion and the vitrinite reflectivity.
3. The method of claim 2, wherein if the vitrinite reflectance of the shale is within a predetermined range and the matrix type is a predetermined matrix type, the target area indicates at least two types;
the method further comprises the following steps:
obtaining the cause of the shale gas;
according to the cause, determining a target type from the at least two types, wherein the target type is the type of the shale gas.
4. The method of claim 1, further comprising, prior to said obtaining at least two properties of the shale that can be used to evaluate a type of shale gas:
establishing a classification coordinate system by taking the first attribute as a vertical coordinate and at least taking the second attribute as the vertical coordinate;
and at least integrating the relationship between the type of the shale gas and the first attribute and the relationship between the type of the shale gas and the second attribute, and dividing the classification coordinate system into different areas, wherein the areas are used for indicating the type of the shale gas.
5. The method of claim 2, further comprising, prior to said obtaining at least two properties of the shale that can be used to evaluate a type of shale gas:
establishing a classification coordinate system by taking the matrix type as a vertical coordinate and the structure motion and the vitrinite reflectivity as a horizontal coordinate;
and dividing the classification coordinate system into different areas by integrating the relation between the type of the shale gas and the reflectivity of the vitrinite, the relation between the type of the shale gas and the type of the matrix and the relation between the type of the shale gas and the construction motion, wherein the areas are used for indicating the type of the shale gas.
6. The method according to claim 3, wherein the predetermined range is 0.5% to 0.7%.
7. An apparatus for obtaining a type of shale gas, comprising:
the system comprises an obtaining module, a judging module and a judging module, wherein the obtaining module is used for obtaining at least two attributes of shale, and the at least two attributes can be used for evaluating the type of shale gas and comprise a first attribute and a second attribute; the shale is shale in which the shale gas exists;
a determining module, configured to determine, according to the at least two attributes, a target region corresponding to the shale gas on a shale gas classification map, where the target region is used to indicate a type of the shale gas; the shale gas classification diagram is obtained by at least integrating the relationship between the first attribute and the type of the shale gas and the relationship between the second attribute and the type of the shale gas;
if the first attribute is a matrix type, the second attribute is a tectonic movement of shale, and the tectonic movement of shale is a first tectonic movement, the obtaining module is specifically configured to:
obtaining a matrix type of the shale;
acquiring the tectonic movement of the shale, wherein the acquired result is that the tectonic movement is a first tectonic movement;
the determining module is specifically configured to:
and determining a target area corresponding to the shale gas on a shale gas classification chart according to the shale matrix type and the first structure motion.
8. An apparatus for obtaining a type of shale gas, comprising:
the system comprises an obtaining module, a judging module and a judging module, wherein the obtaining module is used for obtaining at least two attributes of shale, and the at least two attributes can be used for evaluating the type of shale gas and comprise a first attribute and a second attribute; the shale is shale in which the shale gas exists;
a determining module, configured to determine, according to the at least two attributes, a target region corresponding to the shale gas on a shale gas classification map, where the target region is used to indicate a type of the shale gas; the shale gas classification diagram is obtained by at least integrating the relationship between the first attribute and the type of the shale gas and the relationship between the second attribute and the type of the shale gas;
if the first attribute is a matrix type, the second attribute is a tectonic movement of shale, and the tectonic movement of shale is a second tectonic movement, the obtaining module is specifically configured to:
obtaining a matrix type of the shale;
acquiring the tectonic movement of the shale, wherein the acquired result is that the tectonic movement is a second tectonic movement;
obtaining vitrinite reflectivity of the shale;
the determining module is specifically configured to:
and determining a target area corresponding to the shale gas on the shale gas classification diagram according to the shale matrix type, the second structure motion and the vitrinite reflectivity.
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