CN111965727B - Heterogeneous division and description method for sedimentary rock - Google Patents

Heterogeneous division and description method for sedimentary rock Download PDF

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CN111965727B
CN111965727B CN202010830255.6A CN202010830255A CN111965727B CN 111965727 B CN111965727 B CN 111965727B CN 202010830255 A CN202010830255 A CN 202010830255A CN 111965727 B CN111965727 B CN 111965727B
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dolomite
rock
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calcite
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CN111965727A (en
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易积正
吴世强
张亮
罗凯
杜小娟
管文静
范传军
陈凤玲
吴慕宁
申君
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China Petroleum and Chemical Corp
Exploration and Development Research Institute of Sinopec Jianghan Oilfield Co
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China Petroleum and Chemical Corp
Exploration and Development Research Institute of Sinopec Jianghan Oilfield Co
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Abstract

The application provides a heterogeneous partitioning and describing method for a mixed rock, which comprises the following steps: s1, observing and layering a rock core of a target well section, describing the rock core, and determining a plurality of groups of different lithological combinations by combining a logging curve of the target well section; s2, respectively sampling rock cores of each group of lithological combinations, selecting different rock core samples for analysis and test according to different lithological combinations, determining mineral components and characteristics of each group of lithological combinations, analyzing the deposition of a target well section, and determining the cause of minerals; and S3, performing lithofacies analysis and division on the target well section according to the mineral components and the characteristics of each lithological combination and by combining the content relation between the minerals of each lithological combination and the organic carbon distribution, and determining the lithofacies heterogeneity characteristics of the target well section. The method can effectively divide and evaluate the heterogeneity distribution of the mixed rock, thereby having more accurate guiding significance for later-stage oil and gas exploration, development and exploitation.

Description

Heterogeneous division and description method for sedimentary rock
Technical Field
The application relates to the field of mixed rock, in particular to a mixed rock heterogeneity dividing and describing method.
Background
At present, the heterogeneity of the mixed rock of a target well section in the longitudinal direction is generally researched by combining core description with high-frequency sequence partitioning comparison, and the beneficial small layer distribution of the mixed rock in the plane and the longitudinal direction is mainly determined by comparing the rock in the longitudinal direction and the transverse direction.
However, the existing core description technology mainly adopts an analysis assay means such as visual observation combined with a slice and the like to illustrate the heterogeneity lithologically, and the method is lack of a large amount of experimental data and effective analysis and explanation of the heterogeneity from the cause.
Disclosure of Invention
The application provides a heterogeneous partition and description method for a mixed rock, and aims to solve the problem that the heterogeneous partition of the mixed rock is inaccurate in the prior art.
The technical scheme of the application is as follows:
a heterogeneous division and description method for a sedimentary rock comprises the following steps:
s1, observing and layering a rock core of a target well section, describing the rock core, and determining a plurality of different lithological combinations by combining a logging curve of the target well section;
s2, respectively sampling rock cores of each lithological combination, selecting different rock core samples for analysis and test according to different lithological combinations, determining mineral components and characteristics of each lithological combination, analyzing the deposition of the target well section, and determining the cause of the minerals;
and S3, performing lithofacies analysis and division on the target well section according to the mineral components and the characteristics of each lithological combination and by combining the content relation between the minerals of each lithological combination and the organic carbon distribution, and determining the lithofacies heterogeneity characteristics of the target well section.
As an aspect of the present application, in step S1, the core description includes performing a color description, a lithology description, and a sedimentary structure description on the core.
As a technical solution of the present application, in step S1, the multiple sets of lithological combinations include striated lamellar argillaceous dolomites, striated lamellar argillaceous mudstones, striated lamellar gray argillates, and mudstones.
According to the technical scheme, the color of the striated lamellar argillaceous dolomitic rock is mainly gray, the lithology is mainly dolomite, the color of the striated lamellar argillaceous dolomitic rock is mud rock, the content of the dolomite is more than 40-50%, the content of argillaceous debris is 40-45%, the content of calcite is 5-15%, and the striated lamellar argillaceous dolomitic rock shows a medium-low gamma characteristic on a logging curve; the color of the striated lamellar cloud mudstone is mainly gray, the lithology is mainly mudstone, the lithology is dolomite, the content of argillaceous debris is 45-60%, the content of dolomite is more than 25-35%, the content of calcite is 15-20%, and the striated lamellar cloud mudstone is expressed as a medium gamma characteristic on a logging curve; the color of the striated laminar gray mud rock is mainly gray, the lithology is mainly mud rock, the lithology is calcite, the argillaceous debris content is 50-70%, the calcite content is more than 25-40%, the dolomite content is 5-10%, and the striated laminar gray mud rock shows a medium gamma characteristic on a logging curve; the color of the mudstone is mainly dark gray, the lithology is mainly the mudstone, and the mudstone is expressed as a high gamma characteristic on a logging curve.
As one technical solution of the present application, in step S2, the minerals include carbonate minerals, clay minerals, feldspar, quartz, sulfate minerals, and halite; the carbonate mineral includes dolomite and calcite, the clay mineral includes chlorite and illite mixed layer, the feldspar includes potassium feldspar and albite, the sulfate mineral includes glauberite, anhydrite and thenardite.
As one solution of the present application, in step S2, the deposition of the target well section includes biochemical action, chemical evaporation action, and event deposition action.
As a technical solution of the present application, in step S3, the distribution of the organic carbon content is sequentially divided into a low TOC segment, a medium TOC segment, a higher TOC segment, and a high TOC segment from low to high, the TOC content in the low TOC segment is 0 to 0.5%, the TOC content in the medium TOC segment is 0.5 to 1%, the TOC content in the higher TOC segment is 1.0 to 1.5%, and the TOC content in the medium TOC segment is 1.5 to 3.5%.
As a technical solution of the present application, in the higher TOC section and the high TOC section of step S3, the target well section is lithofacially divided according to the content of dolomite, calcite, quartz + feldspar + clay; if the content of the dolomite is more than 50 percent, the dolomite is argillaceous dolomite; if the content of the quartz, the feldspar and the clay is more than 50 percent, determining the shale; if the content of the calcite is more than 50%, the calcite is marlite; if the contents of the dolomite, the calcite, the quartz, the feldspar and the clay are all less than 50%, the mixed accumulated fine-grained rock is formed; if the ratio of the content of calcite and dolomite to the total content of calcite, dolomite, quartz, feldspar and clay is more than 0.6, the carbonate bulk fine rock is obtained; and if the ratio of the content of the calcite and the dolomite to the total content of the calcite, the dolomite, the quartz, the feldspar and the clay is less than 0.6, the argillaceous mixed-deposition fine-grained rock is obtained.
As a technical solution of the present application, in the low TOC section and the medium TOC section of step S3, the target well section is lithofacially divided according to the content of dolomite, evaporated minerals, quartz + feldspar + clay + calcite; if the content of the dolomite is more than 50 percent, the dolomite is argillaceous dolomite; if the content of the quartz, the feldspar, the clay and the calcite is more than 50 percent, the shale is formed; if the content of the evaporated minerals is more than 50%, the rock salt is evaporated; if the contents of the dolomite, the evaporated minerals and the quartz, the feldspar, the clay and the calcite are all less than 50%, the mixed-accumulated fine-grained rock is formed; and if the ratio of the content of the dolomite + the evaporated minerals to the total content of the dolomite + the evaporated minerals, the quartz + the feldspar + the clay + the calcite is more than 0.6, the rock is the evaporated salt accretion fine particles, and if the ratio of the content of the dolomite + the evaporated minerals to the total content of the dolomite + the evaporated minerals, the quartz + the feldspar + the clay + the calcite is less than 0.6, the rock is the salty argillaceous accretion fine particles.
The beneficial effect of this application:
the application provides a heterogeneous division and description method for a sedimentary rock, which mainly comprises the following steps: s1, observing and layering a rock core of a target well section, describing the rock core, and determining a plurality of different lithological combinations by combining a logging curve of the target well section; s2, respectively sampling rock cores of each group of lithological combinations, selecting different rock core samples for analysis and test according to different lithological combinations, determining mineral components and characteristics of each group of lithological combinations, analyzing the deposition of a target well section, and determining the cause of minerals; and S3, performing lithofacies analysis and division on the target well section according to the mineral components and the characteristics of each lithological combination and by combining the content relation between the minerals of each lithological combination and the organic carbon distribution, and determining the lithofacies heterogeneity characteristics of the target well section. According to the method, on the basis of core description, different lithological combinations are divided by combining logging curve data of a target well section, and on the basis, each lithological combination is subjected to various analysis and test tests to analyze mineral components and characteristics of the lithological combination, so that the accuracy of the small-layer division of the target well section can be effectively improved, the heterogeneity of the target well section can be studied in detail and accurately, the mineral cause and the deposition of the target interval can be effectively analyzed and explained, and powerful evidence and theoretical supporting basis can be provided for later-stage oil and gas geological exploration and exploitation. In addition, on the basis of the research, the lithofacies division is carried out on the target well section by combining the relation between the organic carbon distribution and the lithology combination of the target well section, so that a powerful direction is provided for the deep research of the target block.
Drawings
In order to more clearly explain the technical solutions of the embodiments of the present application, the drawings that are required to be used in the embodiments will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present application and therefore should not be considered as limiting the scope, and that for those skilled in the art, other related drawings can be obtained from these drawings without inventive effort.
FIG. 1 is a flow chart of a method for heterogeneous classification and description of a mudstone according to an embodiment of the present application;
FIG. 2A is a scanning electron microscope image of dolomite as provided in the examples herein;
FIG. 2B is a scanning electron microscope image of dolomite as provided in the examples herein;
figure 3A is a scanning electron micrograph of calcite provided in the examples herein;
figure 3B is a scanning electron micrograph of calcite provided in an example of the present application;
fig. 4A is a scanning electron microscope image of clay mineral provided in the embodiment of the present application;
fig. 4B is a scanning electron microscope image of clay mineral provided in the embodiment of the present application;
FIG. 5A is a scanning electron microscope view of feldspar provided in the examples of the present application;
FIG. 5B is a scanning electron microscope of feldspar stone provided in the examples of the present application;
FIG. 6A is a scanning electron microscope photograph of quartz provided in accordance with an embodiment of the present application;
FIG. 6B is a scanning electron microscope photograph of quartz provided in accordance with an embodiment of the present application;
fig. 7A is a microscope image of glauberite flakes provided in an example of the present application;
fig. 7B is a microscope image of glauberite flakes provided in an embodiment of the present application;
FIG. 8A is a microscope image of an anhydrite flake provided in accordance with an embodiment of the present application;
FIG. 8B is a microscope photograph of an anhydrite flake provided in accordance with an embodiment of the present application;
FIG. 9A is a rock salt core diagram provided in accordance with an embodiment of the present application;
FIG. 9B is a rock salt core diagram provided in accordance with an embodiment of the present application;
figure 10 is a histogram of calcite and TOC content distributions provided by examples of the present application;
fig. 11 is a histogram of quartz feldspar clay and TOC content distribution according to an embodiment of the present disclosure;
FIG. 12 is a histogram of the distribution of dolomite and TOC content provided in the examples of the present application;
FIG. 13 is a histogram of the distribution of evaporated minerals and TOC content provided in an example of the present application;
FIG. 14 is a diagram of a higher TOC segment, high TOC segment facies classification three-end member provided by an embodiment of the present application;
FIG. 15 is a diagram of three end members of facies classification for low-TOC and medium-TOC segments provided in an embodiment of the present application;
FIG. 16 is a chart of a marine shale facies of the oil 1 leading borehole potential triple-quadruple 10 rhythm salt provided by an embodiment of the present application;
FIG. 17 is a chart of a marine clam oil 2 well potential triple-quadruple 10 prosodic salt interlithofacies histogram provided in an example of the present application;
fig. 18 is a diagram of a queen 99 well latent tri-tetra-10 prosodic intersalt lithofacies histogram provided in an embodiment of 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. The components of the embodiments of the present application, generally described and illustrated in the figures herein, can be arranged and designed in a wide variety of different configurations.
Thus, the following detailed description of the embodiments of the present application, presented in the accompanying drawings, is not intended to limit the scope of the claimed application, but is merely representative of selected embodiments of the application. 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.
It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, it need not be further defined and explained in subsequent figures.
In the description of the present application, it should be noted that the terms "upper", "lower", and the like refer to orientations or positional relationships based on the orientations or positional relationships shown in the drawings or orientations or positional relationships that the products of the present invention are conventionally placed in use, and are used for convenience in describing the present application and simplifying the description, but do not indicate or imply that the devices or elements referred to must have a specific orientation, be constructed in a specific orientation, and be operated, and thus should not be construed as limiting the present application.
Further, in the present application, unless expressly stated or limited otherwise, the first feature may be directly contacting the second feature or may be directly contacting the second feature, or the first and second features may be contacted with each other through another feature therebetween, not directly contacting the second feature. Also, the first feature being above, on or above the second feature includes the first feature being directly above and obliquely above the second feature, or merely means that the first feature is at a higher level than the second feature. A first feature that underlies, and underlies a second feature includes a first feature that is directly under and obliquely under a second feature, or simply means that the first feature is at a lesser level than the second feature.
Furthermore, the terms "horizontal", "vertical" and the like do not imply that the components are required to be absolutely horizontal or pendant, but rather may be slightly inclined. For example, "horizontal" merely means that the direction is more horizontal than "vertical" and does not mean that the structure must be perfectly horizontal, but may be slightly inclined.
In the description of the present application, it is also to be noted that, unless otherwise explicitly specified or limited, the terms "disposed," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present application can be understood in a specific case by those of ordinary skill in the art.
Example (b):
referring to fig. 1 and fig. 2 to 18, an embodiment of the present application provides a method for heterogeneous partitioning and describing a mudstone, which includes the following steps:
s1, observing and layering a rock core of a target well section, describing the rock core, and determining a plurality of groups of main different lithological combinations by combining a logging curve of the target well section;
s2, respectively sampling rock cores of each group of lithological combinations, selecting different rock core samples for analysis and test according to different lithological combinations, and determining main mineral components and characteristics of each group of lithological combinations, analyzing main deposition of a target well section, and determining main causes of minerals;
and S3, performing main lithofacies analysis and division on the target well section according to the mineral components and the characteristics of each lithological combination and by combining the content relation between the minerals of each lithological combination and the organic carbon distribution, and determining the lithofacies heterogeneity characteristics of the target well section.
In step S1, the core description includes color description, lithology description, and sedimentary structure description of the core.
In step S1, the main sets of lithological combinations include striated lamellar argillaceous dolomites, striated lamellar argillaceous mudstones, striated lamellar gray argillates, and mudstones.
The salt interlayer of the sunken submerged river group of the submerged river is taken as an example for specific explanation:
it should be noted that, in this example, the color of the striated argillaceous dolomitic rock is mainly gray, the lithology is mainly dolomite, and then argillaceous rock is included, wherein the content of dolomite is more than 40-50%, the content of argillaceous debris is 40-45%, and the content of calcite is 5-15%; and it exhibits medium-low gamma characteristics on the log curve. The color of the lamellar cloud argillaceous shale is mainly gray, the lithology is mainly argillaceous shale, and then the argillaceous rock is mainly dolomite, wherein the argillaceous debris content is 45-60%, the dolomite content is more than 25-35%, and the calcite content is 15-20%; and it appears as a medium gamma characteristic on the log curve. The color of the striated laminar gray mud rock is mainly gray, the lithology is mainly mud rock, and then the striated laminar gray mud rock is calcite, wherein the content of argillaceous debris is 50-70%, the content of calcite is more than 25-40%, and the content of dolomite is 5-10%; and it appears as a medium gamma characteristic on the log curve. The color of mudstone is mainly dark gray, the lithology is mainly mudstone, and the mudstone shows high gamma characteristics on a logging curve.
In step S2, the main minerals include carbonate minerals, clay minerals, feldspar, quartz, sulfate minerals, and halite. Wherein the carbonate mineral mainly comprises dolomite and calcite, the clay mineral mainly comprises chlorite and illite mixed layer, the feldspar mainly comprises potassium feldspar and albite, and the sulfate mineral mainly comprises glauber salt, anhydrite and thenardite.
Referring to fig. 2A and fig. 2B to 9B, the main features of each main mineral are described as follows:
(1) referring to FIG. 2A and FIG. 2B, dolomite crystals are clustered together in a ring around a pore with a diameter ranging from 3 to 8 μm. The dolomite crystals are rhombohedral or sub-rhombohedral with some of the central pores within the annular aggregates filled by microcrystalline pyrite crystals in the figure.
(2) Referring to fig. 3A and fig. 3B, the calcite particles are mostly distributed around the holes left by the degradation of planktonic microorganisms, and the calcite crystals are mostly less than 5 μm, do not have a perfect rhombohedral shape, and do not show obvious biological microstructure characteristics.
(3) Referring to fig. 4A and fig. 4B, a large amount of the illite-smectite mixture layer was filled in the inter-granular pores, and a small amount of chlorite mineral was observed.
(4) Referring to fig. 5A and 5B, it can be seen that the feldspar crumb particles are mostly potash feldspar, are in the level of silt, have broken surfaces, have traces of being substituted by calcite and clay minerals, but have limited number, and can also be seen as authigenic albite minerals.
(5) Referring to fig. 6A in conjunction with fig. 6B, quartz exists in two forms, one is terrestrial quartz, which is broken at the surface and is replaced by a mud crystal carbonate material, and the other is authigenic quartz, which appears in inter-granular pores.
(6) Referring to fig. 7A and fig. 7B, the glauberite crystal is transparent-translucent, colorless, gray, visible as microcrystalline, coarse macrocrystalline, autogenous-semi-autogenous, and mostly in the form of rhombohedral plate, rhombohedral sheet, needle, column, etc., and the interspersed twins are visible in fig. 7A. Meanwhile, the aggregate is in the shape of block, bunch, petal, etc. Some glaserite crystals fluoresce orange (see fig. 7B). Glauberite minerals are widely distributed in this study, with a deposition order between gypsum and halite.
(7) Referring to fig. 8A in combination with fig. 8B, the anhydrite crystals are transparent and translucent, and are colorless, white, and gray in color. The study region is mostly microcrystalline, and it is semi-self-shaped, mostly in the form of column, needle, sheet, rod, visible in radial form (see fig. 7A), and a small amount of lamellar product (see fig. 7B).
(8) Referring to fig. 9A and fig. 9B, the rock salt crystals are colorless and transparent (as shown in fig. 9A), and are fine-grained to coarse-grained, mostly self-shaped cubes, and partially shaped into other grains. In FIG. 9B, the argillaceous rock salt is gray or black; part of the rock salt appears as cement before the particles, often coexisting with glauberite, anhydrite.
In step S2, the formation of various minerals in the salt-rich formation is controlled by the deposition process in a high salt environment and the diagenesis after burial. The deposition of the salt interlayer of the sunken submerged river group of the submerged river mainly comprises biochemical action, chemical evaporation action and event deposition action.
In this example, the biochemical causes are: in the research area of the application, the dolomite crystals are distributed around a hollow round hole, part of the hollow holes are filled with pyrite polymer, and the latticed dolomite actually reflects the structural characteristics left by the participation of microorganisms. In the dolomite-enriched core sample, argillaceous crystal dolomite and pyrite are symbiotic with organic substances, which indicates that the formation of dolomite may be related to the activity of sulfate reducing bacteria; calcite is distributed around the microbial degradation pores, and the microbial degradation pores are mostly formed by oxidation of organic matters in the early diagenesis stage; the relevant pores are also visible in the microbially induced calcite crystals, as are the pores left behind for organic matter degradation, indicating that the organism itself (cell wall) is the carrier of calcite crystallization.
Further, the causes of chemical evaporation are: the study area deposited up to 4700m with cumulative thickness of the halite layer up to 1800m for a total of 193 salt prosodic layers, indicating significant chemical evaporation during deposition. The change law of the mineral types contained in each salt rhythm layer of the research area is halite-sulfate-carbonate-sulfate-halite, so that the change reflects the change of the salinity and the precipitated mineral types of the water body in each deposition stage in terms of each rhythm.
Further, the causes of event deposition are: small staggered bedding can be observed in the thin slices of the fine-grained sedimentary rock between the salts in the research area, and erosion retention sedimentation is developed; the salt layer in the research area is shown as white or transparent halite rock with black mass argillaceous halite rock, the black halite mass is deposited as halite clastic flow, and transparent halite crystals contained in the salt layer are halite recrystallization products. Additionally, significant particles of clastic gypsum can be seen in the anhydrite intervals as slumping products.
Referring to fig. 10 and fig. 13, the organic carbon distribution in the research area of the present application is as follows:
the mineral components with the TOC less than 0.5 percent have no obvious relationship with the TOC except for the evaporated minerals, such as calcite, dolomite and quartz feldspar clay, and the content of the evaporated minerals is extremely high, and the cause is mainly chemical evaporation and is assisted by the participation of the event deposition cause. The evaporated mineral content of TOC between 0.5 and 1% decreased, with no significant increase in calcite, quartz + feldspar + clay, but a significant increase in dolomite, during which the main deposition was chemical evaporation and biochemical. The TOC is between 1.0 and 1.5 percent, the evaporated minerals are obviously reduced as before, calcite, quartz, feldspar and clay are obviously increased and reach the highest value, the relation between dolomite and the TOC is not clear, but the whole TOC presents a high value; during this period, the deposition is dominated by biochemical and event deposition. When the TOC is more than 1.5 percent, calcite, quartz, feldspar and clay are obviously reduced, the content of evaporated minerals is integrally low, dolomite and the TOC are in positive correlation, the deposition effect in the period is biochemical, and the cause of event deposition is participated.
Thus, considering the deposition, in step S3, we limit the TOC to 1.0%; the TOC is in a relative desalination period of more than 1.0 percent, and the deposition effect is a biological effect, a chemical evaporation effect and an event deposition effect; TOC is high salt period below 1%, deposition is chemical evaporation, biochemical and event deposition. Therefore, segmentation is performed with the TOC of 1.0%; less than 1.0% comprises low TOC segments, medium TOC segments, and more than 1.0% comprises higher TOC segments and high TOC segments.
Referring to fig. 10, with reference to fig. 13, the distribution of the organic carbon content is sequentially divided into a low TOC segment, a middle TOC segment, a higher TOC segment, and a high TOC segment from low to high, wherein the TOC content in the low TOC segment is 0 to 0.5%, the TOC content in the middle TOC segment is 0.5 to 1%, the TOC content in the higher TOC segment is 1.0 to 1.5%, and the TOC content in the middle TOC segment is 1.5 to 3.5%.
In the higher TOC section and the high TOC section of the step S3, performing lithofacies division on the target well section according to the contents of dolomite, calcite, quartz, feldspar and clay, wherein the mineral content is more than 50% and is XX rock, more than 20% and less than 50% are XX substances, and less than 20% and more than 10% are XX substances; all mineral contents are less than 50 percent, and the mineral is named as mixed-accumulated fine-grained rock.
For example, if the dolomite content is greater than 50%, it is argillaceous dolomite; if the content of quartz, feldspar and clay is more than 50%, determining the mud rock; if the content of calcite is more than 50%, the limestone is marlite; if the contents of dolomite, calcite, quartz, feldspar and clay are all less than 50 percent, the rock is the mixed accumulated fine-grained rock. Meanwhile, in the mixed-volume fine-grained rock, the mineral content > 20% participates in naming, and the higher the content, the closer the name is to the main name. For example, calcite 20%, dolomite 30%, and mudstone 40% are the fine-grained dolomite argillaceous shale.
Meanwhile, if the ratio of the content of calcite + dolomite to the total content of calcite + dolomite + quartz + feldspar + clay is more than 0.6, the carbonate bulk fine rock is obtained; and if the ratio of the content of the calcite and the dolomite to the total content of the calcite, the dolomite, the quartz, the feldspar and the clay is less than 0.6, determining the argillaceous mixed-accumulated fine-grained rock. The reason why 0.6 is taken as a boundary here is that lithology statistics is carried out on the data, and the data show that more than 0.6 is gray matter and cloud matter mixed-accumulated fine-grained rock, the high-TOC section belongs to carbonate matter mixed-accumulated fine-grained rock, and the data below 0.6 is mud matter mixed-accumulated fine-grained rock.
Referring to fig. 14 and fig. 15, in the low-TOC section and the medium-TOC section of step S3, the target well section is divided into facies according to the contents of dolomite, evaporated minerals, quartz + feldspar + clay + calcite, such that the mineral content is XX when more than 50%, XX when more than 20% and less than 50%, XX when less than 20% and more than 10%; all mineral contents are less than 50 percent, and the mineral is named as mixed-accumulated fine-grained rock.
For example, if the dolomite content is greater than 50%, it is argillaceous dolomite; if the contents of quartz, feldspar, clay and calcite are more than 50%, the mud rock is formed; if the content of the evaporated minerals is more than 50%, the rock salt is evaporated; if the contents of dolomite, evaporated minerals, quartz, feldspar, clay and calcite are all less than 50%, the mixed-accumulated fine-grained rock is formed. For example, the highest sulfate content, the next is quartz + feldspar + clay, and the lowest is dolomite, and the smallest is cloud clay sulfate accretion fine-grained rock.
For the accretion fine grained rock, if the ratio of the content of dolomite + evaporated minerals to the total content of the dolomite + evaporated minerals + quartz + feldspar + clay + calcite is greater than 0.6, the accretion fine grained rock is the evaporation salt fine grained rock, and if the ratio of the content of the dolomite + evaporated minerals to the total content of the dolomite + evaporated minerals + quartz + feldspar + clay + calcite is less than 0.6, the accretion fine grained rock is the salty argillaceous. The limit of 0.6 here is also based on statistics, and in mixed fine-grained rocks larger than 0.6, the main minerals are mostly glauber salt, anhydrite or dolomite; in mixed fine rock below 0.6, argillaceous is the predominant mineral more prevalent.
According to the classification scheme, the main lithofacies types of the higher TOC section and the high TOC section of the salt interlayer of the sunken submerged river comprise argillaceous dolomitic dolomite, argillaceous limestone, mudstone, gray mudstone, argillaceous intergrown fine-grained rock and carbonate intergrown fine-grained rock; the main lithofacies types of the low TOC section and the medium TOC section are glauberite, dolomitic glauberite, argillaceous margarite, glauberite dolomite, anhydrite, argillaceous anhydrite, thenardite, halite, argillaceous mudstone, salt-containing argillaceous mixed fine-grained rock and evaporated salt mixed fine-grained rock.
Meanwhile, referring to fig. 16 in combination with fig. 17 and 18, the upper part of the clam oil 1 well latent triple-quadruple 10 rhythm salt interlayer mainly develops glauberite, thenardite, evaporated salt mixed fine-grained rock and argillaceous dolomite; developing middle part with argillaceous dolomites, carbonate mixed fine-grained rocks, argillaceous mixed fine-grained rocks and grey argillaceous mudstones; developing glauberite rock at the lower part, muddy fine rock containing salt, muddy fine rock containing evaporated salt and argillaceous dolomitic rock. 2-well latent three-four 10 rhythm salt interlayer upper development glauberite, anhydrous glauberite, evaporated salt mixed fine-grained rock and argillaceous dolomite of the mussel leaf oil; the middle part develops the argillaceous dolomitic rock, the carbonate mixed fine-grained rock and the argillaceous mixed fine-grained rock; developing glauberite, evaporated salt mixed fine-grained rock and argillaceous margarite at the lower part. The Wang 99 well submerges the upper part of the three-four 10 rhythm salt interlayer to develop glauberite and argillaceous marovite; developing argillaceous dolomites, gray argillaceous mudstones, mudstones and argillaceous mixed fine-grained rocks in the middle; glauberite, argillaceous margarite, evaporated salt bulk fine-grained rock, argillaceous bulk fine-grained rock, and claystic mudstone.
Therefore, the method can effectively improve the accuracy of the small-layer division of the target well section, carry out detailed and accurate research on the heterogeneity of the target well section, and effectively analyze and explain the mineral cause and the deposition of the target interval, thereby providing powerful evidence and theoretical supporting basis for later oil and gas geological exploration and exploration. In addition, on the basis of the research, the lithofacies division is carried out on the target well section by combining the relation between the organic carbon distribution and the lithology combination of the target well section, so that a powerful direction is provided for the deep research of the target block.
The above description is only a preferred embodiment of the present application and is not intended to limit the present application, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, improvement and the like made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims (6)

1. A heterogeneous division and description method for a sedimentary rock is characterized by comprising the following steps:
s1, observing and layering a rock core of a target well section, describing the rock core, and determining a plurality of different lithological combinations by combining a logging curve of the target well section;
s2, respectively sampling rock cores of each lithological combination, selecting different rock core samples for analysis and test according to different lithological combinations, determining mineral components and characteristics of each lithological combination, analyzing the deposition of the target well section, and determining the cause of the minerals;
s3, performing lithofacies analysis and division on the target well section according to the mineral components and characteristics of each lithological combination and by combining the content relation between the minerals of each lithological combination and the organic carbon distribution, and determining the lithofacies heterogeneity characteristics of the target well section;
in step S3, the distribution of the organic carbon content is sequentially divided into a low TOC segment, a medium TOC segment, a higher TOC segment and a high TOC segment from low to high, where the TOC content in the low TOC segment is 0 to 0.5%, the TOC content in the medium TOC segment is 0.5 to 1.0%, the TOC content in the higher TOC segment is 1.0 to 1.5%, and the TOC content in the high TOC segment is 1.5 to 3.5%;
in the higher TOC section and the high TOC section of step S3, the target well section is lithofacially divided according to the content of dolomite, calcite, quartz + feldspar + clay; if the content of dolomite is more than 50%, the dolomite is argillaceous dolomite; if the content of the quartz, the feldspar and the clay is more than 50 percent, determining the shale; if the content of the calcite is more than 50%, the calcite is marlite; if the contents of the dolomite, the calcite, the quartz, the feldspar and the clay are all less than 50 percent, the mixed-accumulated fine-grained rock is formed; if the ratio of the content of calcite and dolomite to the total content of calcite, dolomite, quartz, feldspar and clay is more than 0.6, the carbonate bulk fine rock is obtained; if the ratio of the content of calcite and dolomite to the total content of calcite, dolomite, quartz, feldspar and clay is less than 0.6, the argillaceous mixed-accumulation fine-grained rock is obtained;
in the low TOC section and the medium TOC section of step S3, the target well section is lithofacially divided according to the contents of dolomite, evaporated minerals, quartz + feldspar + clay + calcite; if the content of dolomite is more than 50%, the dolomite is argillaceous dolomite; if the content of the quartz, the feldspar, the clay and the calcite is more than 50 percent, the shale is formed; if the content of the evaporated minerals is more than 50%, the rock salt is evaporated; if the contents of the dolomite, the evaporated minerals and the quartz, feldspar, clay and calcite are all less than 50%, the mixed fine-grained rock is formed; and if the ratio of the content of the dolomite + the evaporated minerals to the total content of the dolomite + the evaporated minerals, the quartz + the feldspar + the clay + the calcite is more than 0.6, the rock is the evaporated salt accretion fine particles, and if the ratio of the content of the dolomite + the evaporated minerals to the total content of the dolomite + the evaporated minerals, the quartz + the feldspar + the clay + the calcite is less than 0.6, the rock is the salty argillaceous accretion fine particles.
2. The method for compartmentalization and description of heterogeneity of commingled rock of claim 1, wherein said core description comprises color description, lithology description, and depositional structure description of said core in step S1.
3. The method for heterogeneous partitioning and describing of hybride rocks according to claim 1, wherein in step S1, the plurality of sets of lithological combinations include striated laminar argillaceous dolomitic rocks, striated laminar argillaceous mudstones, striated gray argillaceous mudstones, and mudstones.
4. The method for compartmentalization and characterization of heterogeneity of mudstone as claimed in claim 3 wherein said veined argillaceous dolomites are predominantly grey in color, predominantly dolomite in composition, and argillaceous debris in the range of 40-45% in argillaceous debris content and 5-15% in calcite content, said veined argillaceous dolomites exhibiting medium-low gamma characteristics on the log curve; the color of the striated lamellar cloud mudstone is mainly gray, the components are mainly argillaceous debris, the secondary argillaceous debris is dolomite, the content of the argillaceous debris is 45-60%, the content of the calcite is 15-20%, and the striated lamellar cloud mudstone is expressed as a medium gamma characteristic on a logging curve; the color of the striped layered gray matter mudstone is mainly gray, the content of argillaceous debris is 50-70%, the content of dolomite is 5-10%, and the striped layered gray matter mudstone is expressed as a middle gamma characteristic on a logging curve; the color of the mudstone is mainly dark gray, and the mudstone shows a high gamma characteristic on a logging curve.
5. The method for heterogeneous classification and description of commingled rock of claim 1, wherein in step S2, said minerals comprise carbonate minerals, clay minerals, feldspar, quartz, sulfate minerals and halite; the carbonate mineral includes dolomite and calcite, the clay mineral includes chlorite and illite mixed layer, feldspar includes potassium feldspar and albite, the sulfate mineral includes glauberite, anhydrite and thenardite.
6. The method for heterogeneous compartmentalization and characterization of mixed-deposit rock according to claim 1, wherein in step S2, said deposition of said target interval comprises biochemical action, chemical evaporation and event deposition.
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