CN111896674A - Shale oil and gas reservoir body deposition microphase processing system and identification method - Google Patents
Shale oil and gas reservoir body deposition microphase processing system and identification method Download PDFInfo
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N31/00—Investigating or analysing non-biological materials by the use of the chemical methods specified in the subgroup; Apparatus specially adapted for such methods
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N31/00—Investigating or analysing non-biological materials by the use of the chemical methods specified in the subgroup; Apparatus specially adapted for such methods
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Abstract
The invention provides a shale oil gas reservoir body deposition microphase processing system and an identification method, according to the condition that the current shale oil gas exists in shale, the shale has the characteristics of pure quality, compactness and fine particles, the lithology is relatively single, and the condition that the shale is a 'ferrous plate', the problem that the shale with pure quality can only be simply divided into a 'shallow water phase' and a 'deep water phase' is solved, the deposition environment when the shale is formed is judged through the technologies of rock slice identification, a scanning electron microscope, X diffraction, slice identification, electronic probe analysis and the like, the deposition microphase is divided, and the deposition process and the deposition microphase distribution characteristics of the shale with relatively single appearance are precisely characterized in space.
Description
Technical Field
The invention belongs to the technical field of shale oil-gas exploration and development, and particularly relates to a shale oil-gas reservoir body deposition microphase processing system and an identification method.
Background
With the continuous increase of the heat of shale oil and gas exploration and development, the research on the shale is gradually deepened from the research on simple lithology and physical property characteristics to the research on heterogeneity. Shale is no longer "chalky", and the heterogeneity of lithology contributes to the heterogeneity of reservoir properties and oil and gas distribution.
At present, the lithological heterogeneity of the shale is characterized by parameters such as surrounding lithofacies (including lithofacies-causative facies), sand-mud ratio, water depth and the like, the characterization means is relatively simple, and the characterization result is relatively rough (only deep water, shallow water shale and the like can be classified). As a sedimentary rock, the lithologic heterogeneity of shale is closely related to the formed hydrodynamic force and is controlled by the sedimentary environment and facies zone of shale, but at present, from the hydrodynamic force viewpoint, the classification of the sedimentary environment and facies zone of shale is less researched.
Scholars Bennett et al (1991) and others classified the shale deposition process into 4 general types of deposition processes, such as underflow, low density turbidity, suspension and bio-blanket, and proposed a number of basis for judging the microstructure of the deposition. The scholars Wang-Chao et al (2019) classify and explain the sedimentary layer structure of the shale by researching hydrodynamic characteristics. But neglects the washing structure, the gradient structure and the like of the shale besides the layered structure.
Disclosure of Invention
The invention aims to solve the defects in the prior art and provide a shale oil-gas reservoir deposition microphase processing system and an identification method, according to the condition that the current shale oil gas exists in the shale, the shale has the characteristics of pure quality, compactness and fine particles, the lithology is relatively single, and the condition that the shale is a single piece is solved, the problem that the shale with pure quality can only be simply divided into a shallow water phase and a deep water phase is solved, the deposition environment during the formation of the shale is judged through the technologies of rock slice identification, scanning electron microscopy, X diffraction, slice identification, electronic probe analysis and the like, the deposition microphase is divided, and the deposition process and the deposition microphase distribution characteristics in the shale with relatively single appearance are precisely characterized in space.
The invention adopts the following technical scheme:
a shale oil and gas reservoir body deposition microphase processing system comprises,
the rock lithofacies determination module is used for identifying the types and the contents of quartz, feldspar, rock debris, carbonate rock and clay minerals in the rock by using various technologies such as a Scanning Electron Microscope (SEM), X diffraction (XRD), slice identification, an electronic probe and the like, and determining the rock types according to the types and the contents;
the total organic carbon content determination module comprises: the method for measuring the total organic carbon content is multiple, and the total organic carbon content is measured by combining a persulfate oxidation method in a wet oxidation method and a combustion method in a dry oxidation method. The persulfuric acid oxidation method is to add K into a water sample under the condition of ultraviolet irradiation2S2O8Measuring the content of organic matters in water by oxidizing the organic matters in the water by using persulfate; the combustion method comprises combusting organic substances in high-temperature oxygen-introducing environment, and measuring CO generated2Obtaining the content of organic carbon;
a deposition environment identification module: quantitatively dividing the depth of the sedimentary water body according to the processing result of the total organic carbon content measuring module;
a deposition microphase identification and division module: the sedimentary microfacies recognition module describes a microscopic sedimentary structure of the shale sample through a series of indoor experimental analysis, simultaneously considers the influence of storm action depth, restrains the storm action influence depth by using two parameters, and determines a hydrodynamic environment and a sedimentary action type;
and the sedimentary microfacies division module determines the rock type, the sedimentary water body depth, the hydrodynamic environment and the sedimentary action type according to the rock facies combination and judges the sedimentary microfacies into the following results:
1) shale + deep water total organic carbon content determination module index + coarse tail gradient microstructure → strong storm;
2) shale + deep water total organic carbon content determination module index + erosion microstructure/turbidness microstructure → medium storm;
3) determining module index of shale + deep water total organic carbon content/determining module index of shallower water total organic carbon content + blocky microstructure → weak storm;
4) shale + shallower water total organic carbon content determination module index + slight angle inclined layer/slight parallel layer → intertidal zone;
5) shale + shallower water total organic carbon content determination module index + gradient microstructure → gravity flow;
6) measuring module indexes of shale + shallow water total organic carbon content, slight angle inclined layer/slight parallel layer → side edge of land frame delta;
7) the indexes of a shale + shallow water total organic carbon content determination module + a deposition micro-layer theory cannot be effectively identified → the tope zone of the tide;
8) shale + any total organic carbon content determination module index + bio-blanket micro-structure → bio-blanket microfacies;
9) shale + any total organic carbon content determination module index + micro horizontal layer/block micro structure → suspension;
10) carbonate and shale + any total organic carbon content determination module index + any sedimentary microfeatures → carbonate tide plateau.
The further technical scheme is that the total organic carbon content measuring module adopts various methods to measure the total organic carbon content in the shale sample in a combined manner, and the various methods specifically refer to a wet oxidation method, a dry oxidation method and the like.
The further technical scheme is that the deposition environment recognition module: dividing the depth of the water body by using two parameters of 0.5 percent of total organic carbon content measuring module and 1.5 percent of total organic carbon content measuring module, wherein shallow water is indicated when the total organic carbon content measuring module is less than 0.5 percent, deep water is indicated when the total organic carbon content measuring module is more than 1.5 percent, and a shallower water environment is indicated when the total organic carbon content measuring module is in the middle.
The further technical scheme is that a microscopic sedimentary structure of the shale sample is described by a series of indoor experimental analyses in a sedimentary microfacies recognition and division module, wherein the methods comprise thin slice identification analysis, scanning electron microscope analysis and the like, and the description result is a block microstructure, a stirring microstructure, an erosion microstructure, a micro-low-angle inclined bedding, a micro-parallel bedding, a graded microstructure, a micro-horizontal bedding, a biological blanket microstructure and a coarse tail graded microstructure.
The further technical scheme is that the storm action depth is restrained by two parameters of 30m and 200m, a weak storm action influence area is within 30m, and a medium-strong storm action influence area is 30 m-200 m.
A method for identification using a shale hydrocarbon reservoir depositional microphase processing system, comprising the steps of:
step 1, rock sample selection
The types and the contents of quartz, feldspar, rock debris, carbonate rock and clay minerals in the rock are identified through various technologies such as a Scanning Electron Microscope (SEM), X diffraction (XRD), slice identification, an electronic probe and the like, and the rock type is determined according to the types and the contents.
Step 2, determination of total organic carbon content
The method for measuring the total organic carbon content is multiple, and the total organic carbon content is measured by combining a persulfate oxidation method in a wet oxidation method and a combustion method in a dry oxidation method. The persulfuric acid oxidation method is to add K into a water sample under the condition of ultraviolet irradiation2S2O8Measuring the content of organic matters in water by oxidizing the organic matters in the water by using persulfate; the combustion method comprises combusting organic substances in high-temperature oxygen-introducing environment, and measuring CO generated2The content of organic carbon is obtained.
Step 3, utilizing a deposition environment identification module to identify the deposition environment
And dividing the water depth by using two parameters measured by the total organic carbon content measuring module, wherein a smaller value is used for indicating shallow water, a larger value is used for indicating deep water, and a shallower water environment is indicated between the smaller value and the larger value, so that the water depth is determined.
Step 4, utilizing a sedimentary microfacies feature identification module to identify sedimentary microfacies
Through a series of indoor thin slice identification, scanning electron microscope analysis and other test analysis, a microscopic deposition structure of a shale sample is described, the description result is a block microstructure, a turbid microstructure, an erosion microstructure, a micro-low angle inclined layer, a micro-parallel layer, a graded microstructure, a micro-horizontal layer, a bio-blanket microstructure and a coarse tail graded microstructure, the influence of storm action depth is considered, the storm action influence depth is restrained by two parameters, a weak storm action influence area is within a smaller value, a medium-strong storm action influence area is between a smaller value and a smaller value, and a hydrodynamic environment and a deposition action type are determined;
step 5, the deposition microphase division module carries out division judgment on the deposition microphase
Determining the deposition micro-phase by combining the rock type (1), the water body depth (2), the hydrodynamic environment and the deposition type (3):
the sedimentary microfacies were judged as the following:
1) shale + deep water total organic carbon content determination module index + coarse tail gradient microstructure → strong storm;
2) shale + deep water total organic carbon content determination module index + erosion microstructure/turbidness microstructure
→ moderate storm;
3) determining module index of shale + deep water total organic carbon content/determining module index of shallower water total organic carbon content + blocky microstructure → weak storm;
4) shale + shallower water total organic carbon content determination module index + slight angle inclined layer/slight parallel layer → intertidal zone;
5) shale + shallower water total organic carbon content determination module index + gradient microstructure → gravity flow;
6) measuring module indexes of shale + shallow water total organic carbon content, slight angle inclined layer/slight parallel layer → side edge of land frame delta;
7) the indexes of a shale + shallow water total organic carbon content determination module + a deposition micro-layer theory cannot be effectively identified → the tope zone of the tide;
8) shale + any total organic carbon content determination module index + bio-blanket micro-structure → bio-blanket microfacies;
9) shale, any total organic carbon content determination module index, micro-horizontal layer/block-shaped microstructure
→ suspension;
10) carbonate and shale + any total organic carbon content determination module index + any sedimentary microfeatures → carbonate tide plateau.
The further technical scheme is that the depth of the water body is divided by two parameters of 0.5% of total organic carbon content measuring module and 1.5% of total organic carbon content measuring module, wherein shallow water is indicated when the total organic carbon content measuring module is less than 0.5%, deep water is indicated when the total organic carbon content measuring module is more than 1.5%, and a shallower water environment is indicated when the total organic carbon content measuring module is in between.
The further technical scheme is that the storm action depth is restrained by two parameters of 30m and 200m, a weak storm action influence area is within 30m, and a medium-strong storm action influence area is 30 m-200 m.
The invention has the beneficial effects that:
the invention can effectively subdivide 10 deposition micro-phases (deposition micro-environments) such as 'biological blankets', 'land frame delta side edges', 'tidal zones', 'intertidal zones', 'weak storms', 'medium strong storms', 'suspensions', 'gravity flows' and 'carbonate rock tide terraces', and the like in one step in 'shallow water phase' and 'deep water phase' mudstone deposition environments which can only be divided in most researches.
The simple division of the 'shallow water phase' or the 'deep water phase' is relatively wide, and the shale oil-gas exploration and development cannot be effectively guided. According to the invention, 10 types of sedimentary microfacies are further divided on the basis of the recognition of a 'shallow water phase' or a 'deep water phase', a sedimentary mode is established, different micro areas can be subdivided in the 'shallow water phase' and 'deep water phase' zones, and the fine evaluation of the shale reservoir is realized.
Drawings
Fig. 1 is a microphase identification parameter and result chart of clay shale deposition of a qiongzhuetumidinoda tumidinoda group;
FIG. 2 shows the result of microphase partition of shale sample deposition for qiong village tumidinoda group in Chongqing city;
FIG. 3 is a flow chart of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the technical solutions of the present invention are described clearly and completely below, and it is obvious that the described embodiments are some, not all embodiments of the present invention. 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 invention.
As shown in fig. 3, a shale hydrocarbon reservoir depositional microphase processing system comprises:
the rock lithofacies determination module is used for identifying the types and the contents of quartz, feldspar, rock debris, carbonate rock and clay minerals in the rock through various technologies such as a Scanning Electron Microscope (SEM), X diffraction (XRD), thin slice identification, an electronic probe and the like, and determining the rock types according to the types and the contents.
The total organic carbon content determination module comprises:
american scholars Bennett (1991) classified shale causes into the general categories of underflow, low density turbidity, suspension and bioleaches 4 by sedimentary microstructural features. However, the 4 major categories have a significant problem that the influence of organic matters on the shale is not considered, and the guidance provided for the subsequent exploration and development of shale oil and shale gas is limited. The classical sedimentary theory recognizes that sandstone and shale are clastic rocks, and that sediments are formed after mechanical handling, and have various characteristics of mechanical handling, such as sedimentary formations (sedimentary micro-formations under microscopic conditions). However, the key difference between the shale and the sandstone is that the shale contains a large amount of organic matters, and the shale has the organic matters, so that the sandstone does not have enough organic matters, and the shale can generate oil and natural gas, but the sandstone cannot. The classical sedimentology has not taken organic matter into account for characterization of shale and sandstone sedimentary (micro) formations, neglecting the organic matter property of shale, which is the most critical ring of whether shale oil and shale gas can form geological reservoirs and economic exploitation.
The present invention takes into account the effects of organic matter and establishes a relationship between sedimentary (micro) formations and shale hydrocarbon reservoirs. Similarly, the bottom flow on a land shed with the water depth of 200m and the bottom flow on a continental foundation with the water depth of more than one kilometer are not a sediment body, and the exploration and development potentials of shale oil and shale gas are different. Thus, the present invention incorporates a total organic carbon content (TOC) determination module within a deposition microphase processing system.
The total organic carbon content is related to the depth of lake water or seawater when the shale is deposited, generally, the total organic carbon content is high when the water depth is deep, and the total organic carbon content is low when the water is shallow. The total organic carbon content measuring method comprises a plurality of methods, including a wet oxidation method, a dry oxidation method and the like, and the total organic carbon content in the shale sample is measured by combining a plurality of methods.
A deposition environment identification module:
according to the processing result of the total organic carbon content measuring module, the depth of the sedimentary water body can be quantitatively divided. The invention divides the depth of the water body by two parameters of 0.5 percent TOC and 1.5 percent TOC, wherein, shallow water is indicated when the TOC is less than 0.5 percent, deep water is indicated when the TOC is more than 1.5 percent, and a shallower water environment is indicated when the TOC is in between. The parameter changes due to regional changes, and the method is applied to other research areas only by properly adjusting the parameter. At present, most of domestic and overseas researches rely on the value of the total organic carbon content to distinguish the depth of a water body. But only depends on the method to judge that the ancient environment with a certain error zone exists. For example, as shown in fig. 1, near the ancient tension groove in the sichuan basin, due to the existence of the tension groove, an ancient bulge (hiuron) exists on the east side, a barrier coast develops on the west side, and the total organic carbon content values of the barrier coast (pueraria omeiensis), the hiuron (Guiyang) and the qiongtou qigongyou group in the Chongqing city are in an overlapping region, wherein the total organic carbon content values are distributed around TOC 1.0% (shallower depth). Therefore, if the result is processed by only depending on the total organic carbon content measuring module, the ancient deposition environment is difficult to be effectively determined. A deposition microphase identification and partitioning module must be used.
A deposition microphase identification and division module:
in addition to the total organic carbon content indicator, Bennett (1991) has not considered the effects of storm depth of action, which is only defined generally; he also did not consider sedimentary microfacies associated with shale and carbonate, and shale sedimented in environments with relatively confined blockages between terrestrial-edge delta underwater diversion channels. Identification of storm effects relies on identification of massive microstructures, turbidimetric microstructures, erosive microstructures, and coarse-tailed microstructures (coarse-tailed transformations mostly formed by biological debris). Macroscopic sedimentary formations such as massive bedding and the like are widely applied to observation and description of coarse sandstone cores, but due to the compact single rock characteristics of the shale, remarkable sedimentary formations are difficult to observe on the cores.
The module describes the micro-sedimentary structure of the shale sample through a series of indoor experimental analysis (thin slice identification, scanning electron microscope analysis and the like) (the micro-structure cannot be distinguished on the core). The block microstructure, the stir microstructure, the erosion microstructure and the coarse-tail graded microstructure are all related to storm deposition. The module considers the influence of storm action depth at the same time, and the storm action influence depth is restricted by two parameters of 30m and 200 m. The area within 30m is the weak storm effect area, and the area between 30m and 200m is the medium and strong storm effect area. The division index varies with different regions, and the value can be adjusted appropriately in other research areas.
The module identifies and divides the deposition microfacies as follows:
(1) determining the rock type according to the lithofacies combination;
(2) determining the depth of the water body according to the TOC;
(3) determining a hydrodynamic environment and a deposition type according to the shale deposition microstructure;
(4) the above 3 are combined to determine the deposition micro-phase.
For example:
10) shale + deepwater TOC index + coarse tail tapered microstructure → strong storm;
11) shale + deepwater TOC index + erosion microstructure/turbidness microstructure → medium storm;
12) shale + deepwater TOC index/shallower water TOC index + blocky microstructure → weak storm;
13) shale + shallower water TOC index + slightly low angle inclined layer/slightly parallel layer → intertidal zone;
14) shale + shallower water TOC index + graded microstructure → gravity flow;
15) shale, shallow water TOC index, slight angle inclined bedding/slight parallel bedding → side edge of land frame delta;
16) shale, shallow water TOC index and sedimentary micro-bedding can not be effectively identified (recessive bedding)
→ wet;
17) shale + any TOC + bio-blanket microfeatures → bio-blanket microphase (hydrostatic microphase);
18) shale + any TOC + micro-level bedding/blocky micro-architecture → suspension;
19) carbonate and shale + any TOC + any sedimentary microfeatures → carbonate tide plateau;
a method of identification using a shale hydrocarbon reservoir depositional microphase processing system, comprising the steps of:
step 1, rock sample selection
The types and the contents of quartz, feldspar, rock debris, carbonate rock and clay minerals in the rock are identified through various technologies such as a Scanning Electron Microscope (SEM), X diffraction (XRD), slice identification, an electronic probe and the like, and the rock type is determined according to the types and the contents.
Step 2, determination of total organic carbon content
The method for measuring the total organic carbon content is multiple, and the total organic carbon content is measured by combining a persulfate oxidation method in a wet oxidation method and a combustion method in a dry oxidation method. The persulfuric acid oxidation method is to add K into a water sample under the condition of ultraviolet irradiation2S2O8Measuring the content of organic matters in water by oxidizing the organic matters in the water by using persulfate; the combustion method comprises combusting organic substances in high-temperature oxygen-introducing environment, and measuring CO generated2The content of organic carbon is obtained.
Step 3, utilizing a deposition environment identification module to identify the deposition environment
And dividing the water depth by using two parameters measured by the total organic carbon content measuring module, wherein a smaller value is used for indicating shallow water, a larger value is used for indicating deep water, and a shallower water environment is indicated between the smaller value and the larger value, so that the water depth is determined.
Step 4, utilizing a deposition characteristic identification module to carry out deposition microphase identification
Through a series of indoor thin slice identification, scanning electron microscope analysis and other test analysis, a microscopic deposition structure of a shale sample is described, the description result is a block microstructure, a turbid microstructure, an erosion microstructure, a micro-low angle inclined layer, a micro-parallel layer, a graded microstructure, a micro-horizontal layer, a bio-blanket microstructure and a coarse tail graded microstructure, the influence of storm action depth is considered, the storm action influence depth is restrained by two parameters, a weak storm action influence area is within a smaller value, a medium-strong storm action influence area is between a smaller value and a smaller value, and a hydrodynamic environment and a deposition action type are determined;
step 5, the deposition microphase division module carries out division judgment on the deposition microphase
Determining the deposition micro-phase by combining the rock type (1), the water body depth (2), the hydrodynamic environment and the deposition type (3):
the sedimentary microfacies were judged as the following:
1) shale + deep water total organic carbon content determination module index + coarse tail gradient microstructure → strong storm;
2) shale + deep water total organic carbon content determination module index + erosion microstructure/turbidness microstructure
→ moderate storm;
3) determining module index of shale + deep water total organic carbon content/determining module index of shallower water total organic carbon content + blocky microstructure → weak storm;
4) shale + shallower water total organic carbon content determination module index + slight angle inclined layer/slight parallel layer → intertidal zone;
5) shale + shallower water total organic carbon content determination module index + gradient microstructure → gravity flow;
6) shale + shallow water total organic carbon content determination module index + slight angle inclined layer/slight parallel
Layer → continental rise edge;
7) the indexes of a shale + shallow water total organic carbon content determination module + a deposition micro-layer theory cannot be effectively identified → the tope zone of the tide;
8) shale + any total organic carbon content determination module index + biological blanket micro-structure → biological blanket
Microphase;
9) shale, any total organic carbon content determination module index, micro-horizontal layer/block-shaped microstructure
→ suspension;
10) carbonate and shale + any total organic carbon content determination module index + any sedimentary microfeatures → carbonate tide plateau.
The further technical scheme is that the depth of the water body is divided by two parameters of 0.5% of total organic carbon content measuring module and 1.5% of total organic carbon content measuring module, wherein shallow water is indicated when the total organic carbon content measuring module is less than 0.5%, deep water is indicated when the total organic carbon content measuring module is more than 1.5%, and a shallower water environment is indicated when the total organic carbon content measuring module is in between.
The further technical scheme is that the storm action depth is restrained by two parameters of 30m and 200m, a weak storm action influence area is within 30m, and a medium-strong storm action influence area is 30 m-200 m.
Examples
Before the invention, shale gas exploration research and production of a qiongzhuengqi qiong group by multiple oil and gas field companies and scientific research units establish a repeatedly-changing deposition mode of 'shallow water land shed' and 'deep water land shed' only depending on the depth of a water body, and the repeatedly-changing deposition mode is used as an exploration target preferred foundation. This pattern is meaningful, and the favorable region can be specified over a large range, but it is difficult to refine the study. For example, the kamurakamura, the guiyang warm water village and the Chongqing Hongchun village were all considered to be in a relatively shallow water greenhouses deposition environment in the research results before 2019, but the 3 differences could not be quantified.
As shown in fig. 1 and 2, the application effect of the invention is shown by taking the outdoor section of the Chongqing city as an example. The field profile is positioned at one side of a three-river reservoir in Hongkun village in city, etc., and from the field geological investigation result, the stratums of the qionguengqi temple group are all formed by fine-grained mudstones which are all gray black, and the large section of the ground is continuous and can not be seen to be obviously changed (fig. 2). Due to the fact that rock stratum changes cannot be effectively identified, the field geological investigation result is difficult to better guide and know the changes of geological ancient environments in the formation period of the qiongbao tumidinoda temple group in the area, and exploration and development of shale oil gas are helped to be silent. By taking back a field rock sample and carrying out indoor experimental analysis, according to the operation results of the modules, a plurality of sedimentary microfacies (figure 2) of a qiongzhueu tumidinoda temple group from bottom to top are divided into a intertidal zone, a weak storm, a carbonate tidal terrace, a strong storm, an upward tide zone and a continental shelf delta side edge, and a geological model (figure 1) is combined, so that the further geological research on shale oil gas of the qiongzhueu temple group can be favorably carried out. This result is the present invention.
According to the invention, 10 types of sedimentary microfacies are further divided on the basis of the recognition of a 'shallow water phase' or a 'deep water phase', a sedimentary mode is established, different micro areas can be subdivided in the 'shallow water phase' and 'deep water phase' zones, and the fine evaluation of the shale reservoir is realized.
As shown in fig. 1, based on the deposited microfacies discrimination method proposed in the present invention, it is considered that the border of the continental shelf, the weak storm and the bio-blanket deposited microfacies mainly develop in the border of the terrace of the kamura, the strong storm deposited microfacies and the suspension deposited microfacies mainly develop in the Guiyang warm water village, and the weak storm, suspension and bio-blanket deposited microfacies mainly develop in the Chongqing Hongting village. The suspended deposition microphase and the biological blanket deposition microphase contain a large amount of organic matters, the deposition microphase at the lateral margin of the continental shelf delta contains a large amount of land impurities, and the comparison shows that the development degree of the biological blanket deposition microphase of Chongqing Hongchun is inferior to that of the Pueraria antha, while the deposition microphase at the lateral margin of the continental shelf of the Pueraria antha is relatively developed and is not beneficial to the formation and aggregation of shale gas. And (3) determining the Guiyang warm water village as the one with the most favorable shale gas exploration condition in 3 areas by integrating the determination results of the total organic carbon content. This is an understanding that previous studies have not been able to provide.
According to the division method (underflow, low density turbidity current, suspension and biologics blanket) proposed by american scholars Bennett (1991), one can consider the main development of biologics blanket and suspension deposition in kamurakamura, the main development of suspension deposition in lukewarm water village in Guiyang, and the main development of suspension and biologics blanket deposition in Hongkun village in Chongqing. The Bennett division result is coarser than that of the invention, the negative influence of the slight relative Emei Kumura deposition on the lateral edge of the Delta on the edge of the land frame cannot be identified, more importantly, the total organic carbon content is not measured, and even the depth of the deposited water body in 3 areas cannot be determined clearly. According to the recognition of Bennett, the Guiyang warm water village and the Xiangxi Longshan mountain both develop suspension deposition (figure 1), but because the total organic carbon content is not measured, the medium-strong storm phase (different influences of storms in different water body depths) is not identified like the invention, and the Guiyang warm water village and the Xiangxi Longshan mountain shale gas exploration conditions can only be considered to be similar and not actually the same.
Finally, it should be noted that: the above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it will 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 technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.
Claims (8)
1. A shale oil and gas reservoir body deposition microphase processing system is characterized by comprising
The rock lithofacies determination module is used for identifying the types and the contents of quartz, feldspar, detritus, carbonate rock and clay minerals in the rock by a plurality of methods such as a scanning electron microscope, X diffraction, slice identification and an electronic probe, and determining the rock types according to the types and the contents;
the total organic carbon content determination module comprises: determining the total organic carbon content in the shale sample by adopting a plurality of methods;
a deposition environment identification module: quantitatively dividing the depth of the sedimentary water body according to the processing result of the total organic carbon content measuring module;
depositing a microphase identification module: describing a microscopic deposition structure of a shale sample through a series of indoor experimental analysis, simultaneously considering the influence of storm action depth, constraining the storm action influence depth by using two parameters, and determining a hydrodynamic environment and a deposition action type;
depositing a microphase division module: determining the rock type, the depth of a sedimentary water body, the hydrodynamic environment and the sedimentary action type according to the rock facies combination, the total organic carbon content and the sedimentary microstructure, and judging the sedimentary microfacies into the following results:
1) shale + deep water total organic carbon content determination module index + coarse tail gradient microstructure → strong storm;
2) shale + deep water total organic carbon content determination module index + erosion microstructure/turbidness microstructure → medium storm;
3) determining module index of shale + deep water total organic carbon content/determining module index of shallower water total organic carbon content + blocky microstructure → weak storm;
4) shale + shallower water total organic carbon content determination module index + slight angle inclined layer/slight parallel layer → intertidal zone;
5) shale + shallower water total organic carbon content determination module index + gradient microstructure → gravity flow;
6) measuring module indexes of shale + shallow water total organic carbon content, slight angle inclined layer/slight parallel layer → side edge of land frame delta;
7) the indexes of a shale + shallow water total organic carbon content determination module + a deposition micro-layer theory cannot be effectively identified → the tope zone of the tide;
8) shale + any total organic carbon content determination module index + bio-blanket micro-structure → bio-blanket microfacies;
9) shale + any total organic carbon content determination module index + micro horizontal layer/block micro structure → suspension;
10) carbonate and shale + any total organic carbon content determination module index + any sedimentary microfeatures → carbonate tide plateau.
2. The shale oil and gas reservoir deposit microphase processing system according to claim 1, wherein the total organic carbon content determination module adopts a plurality of methods in combination to determine the total organic carbon content in the shale sample, and the plurality of methods specifically refer to a wet oxidation method, a dry oxidation method and the like.
3. The shale hydrocarbon reservoir depositional microphase processing system of claim 1, wherein the depositional environment identification module: dividing the depth of the water body by using two parameters of 0.5 percent of total organic carbon content measuring module and 1.5 percent of total organic carbon content measuring module, wherein shallow water is indicated when the total organic carbon content measuring module is less than 0.5 percent, deep water is indicated when the total organic carbon content measuring module is more than 1.5 percent, and a shallower water environment is indicated when the total organic carbon content measuring module is in the middle.
4. The shale oil and gas reservoir deposition micro-phase processing system of claim 1, wherein a series of laboratory test analyses in the deposition micro-phase identification and division module, including thin slice identification analysis, scanning electron microscope analysis and the like, describe the micro-deposition structure of the shale sample, and the description result is block micro-structure, turbidness micro-structure, erosion micro-structure, micro-low angle inclined layer, micro-parallel layer, gradient micro-structure, micro-horizontal layer, bio-blanket micro-structure and rough tail gradient micro-structure.
5. The shale oil and gas reservoir deposit microphase processing system of claim 1, wherein the effect of storm effect depth is constrained by two parameters of 30m and 200m, a weak storm effect area is within 30m, and a medium strong storm effect area is within 30m to 200 m.
6. A method for identification using a shale hydrocarbon reservoir depositional microphase processing system, comprising the steps of:
step 1, rock sample selection
Identifying the types and the contents of quartz, feldspar, rock debris, carbonate rock and clay minerals in the rock by a plurality of technologies of a scanning electron microscope, X diffraction, thin slice identification and an electronic probe, and determining the type of the rock according to the types and the contents;
step 2, determination of total organic carbon content
The total organic carbon content is jointly determined by selecting a persulfate oxidation method in a wet oxidation method and a combustion method in a dry oxidation method;
step 3, utilizing a deposition environment identification module to identify the deposition environment
Dividing the water depth by using two parameters measured by a total organic carbon content measuring module, wherein a smaller value is used for indicating shallow water, a larger value is used for indicating deep water, and a shallower water environment is indicated between the smaller value and the larger value, so as to determine the water depth;
step 4, utilizing a sedimentary microfacies feature identification module to identify sedimentary microfacies
Describing a microcosmic deposition structure of a shale sample through a series of indoor slice identification and scanning electron microscope analysis tests, wherein the description result is a block microstructure, a turbid microstructure, an erosion microstructure, a micro-low angle inclined layer, a micro-parallel layer, a graded microstructure, a micro-horizontal layer, a bio-blanket microstructure and a coarse tail graded microstructure, and considering the influence of storm action depth, two parameters are used for restraining the storm action influence depth, a weak storm action influence area is arranged within a smaller value, a medium strong storm action influence area is arranged between a smaller value and a larger value, and a hydrodynamic environment and a deposition action type are determined;
step 5, the dividing module is used for dividing and judging the deposition microphase
Determining the deposition micro-phase by combining three factors according to the rock type (1), the water body depth (2) and the hydrodynamic environment and the deposition type (3):
the sedimentary microfacies were judged as the following:
1) shale + deep water total organic carbon content determination module index + coarse tail gradient microstructure → strong storm;
2) shale + deep water total organic carbon content determination module index + erosion microstructure/turbidness microstructure → medium storm;
3) determining module index of shale + deep water total organic carbon content/determining module index of shallower water total organic carbon content + blocky microstructure → weak storm;
4) shale + shallower water total organic carbon content determination module index + slight angle inclined layer/slight parallel layer → intertidal zone;
5) shale + shallower water total organic carbon content determination module index + gradient microstructure → gravity flow;
6) measuring module indexes of shale + shallow water total organic carbon content, slight angle inclined layer/slight parallel layer → side edge of land frame delta;
7) the indexes of a shale + shallow water total organic carbon content determination module + a deposition micro-layer theory cannot be effectively identified → the tope zone of the tide;
8) shale + any total organic carbon content determination module index + bio-blanket micro-structure → bio-blanket microfacies;
9) shale + any total organic carbon content determination module index + micro horizontal layer/block micro structure → suspension;
10) carbonate and shale + any total organic carbon content determination module index + any sedimentary microfeatures → carbonate tide plateau.
7. The method of identification using a shale hydrocarbon reservoir depositional microphase processing system of claim 6, wherein the depth of the body of water is divided by two parameters, 0.5% total organic carbon content determination module and 1.5% total organic carbon content determination module, less than 0.5% indicating shallow water, greater than 1.5% indicating deep water, and in between indicating a shallower water environment.
8. The method of claim 6, wherein the depth of storm effect is constrained by two parameters, 30m and 200m, within 30m being a weak storm effect zone and 30 m-200 m being a medium storm effect zone.
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