CN112593930A - Screening and evaluating method for oil and gas reservoir favorable area - Google Patents
Screening and evaluating method for oil and gas reservoir favorable area Download PDFInfo
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP 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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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B47/00—Survey of boreholes or wells
Abstract
The invention provides a screening evaluation method of an oil and gas reservoir favorable area, which comprises the following steps: s1) carrying out regional data research; s2) according to the regional data research results, various researches are carried out, including: hydrocarbon source rock evaluation and hydrocarbon generation and discharge history research, reservoir and trap characteristics and reservoir cap combination research, oil and gas transportation and transportation system research, oil and gas injection period secondary research, and heavy oil and light oil difference aggregation mode research; s3) on the basis of various researches, indicating the main control factors of the oil-gas enrichment pool; s4) on the basis of the analysis of the main control factors of the oil-gas enrichment reservoir, researching the oil-gas distribution rule and establishing an oil-gas accumulation mode; s5) points out favorable oil gas gathering zones, and the favorable zones are formed and evaluated for favorable targets. The invention can clarify the oil-gas reservoir conditions of the oil field, develop favorable target evaluation, improve the drilling success rate and accelerate the productivity construction, thereby improving the efficiency and the economic benefit of oil reservoir exploration and development.
Description
Technical Field
The invention relates to the technical field of petroleum exploration and development, in particular to a screening and evaluating method for an oil and gas reservoir favorable area.
Background
With the improvement of exploration degree, the lithologic oil and gas reservoir is the key point of the current exploration, the prediction of the favorable development area of the lithologic oil and gas reservoir is a difficult point, the oil and gas enrichment rule and the reservoir forming probability of the lithologic oil and gas reservoir in the research area are always concerned by people, and the analysis of the main reservoir forming factors of the lithologic oil and gas reservoir and the quantitative research thereof are directly related to the success rate of the oil and gas exploration. However, due to the complexity of geological conditions and uncertainty of the reservoir formation conditions, the research on reservoir formation probability is slow.
Therefore, a method for screening and evaluating the oil and gas reservoir favorable area is needed, and geological basis is provided for the work of increasing, storing and raising production such as well position deployment, reserve evaluation and development scheme compilation.
Disclosure of Invention
Aiming at the defects in the prior art, the invention aims to provide a method for screening and evaluating an oil and gas deposit favorable area.
The invention is realized by the following technical scheme:
a method for screening and evaluating oil and gas deposit favorable areas comprises the following steps:
s1): carrying out regional data research;
s2): according to the regional data research results, various researches are carried out, including:
hydrocarbon source rock evaluation and hydrocarbon generation and discharge history research, reservoir and trap characteristics and reservoir cap combination research, oil and gas transportation and transportation system research, oil and gas injection period secondary research, and heavy oil and light oil difference aggregation mode research;
s3): on the basis of various researches, main control factors of oil-gas enrichment reserves are indicated;
s4): on the basis of the analysis of the main control factors of the oil-gas enrichment reservoir, researching the oil-gas distribution rule and establishing an oil-gas reservoir forming mode;
s5): and (4) indicating a favorable oil and gas accumulation zone, and implementing the zone into a reservoir favorable zone to evaluate favorable targets.
Further, the area data in step S1) includes: the core/rock debris, well logging data, seismic data and oil testing and production testing data.
Further, the well log data comprises: depth, deep lateral resistivity, shallow lateral resistivity, sonic moveout, caliper, natural gamma, and natural potential.
Further, the hydrocarbon source rock evaluation and hydrocarbon generation and expulsion history study in the step S2) is specifically as follows:
evaluating the abundance, type and maturity of the source rocks by using the pyrolysis parameters of J, K source rocks on the region, and summarizing the geochemical characteristics of the source rocks;
and summarizing the history of hydrocarbon generation and discharge of the main hydrocarbon source rock in the research area by combining the logging information and the core analysis test result.
Further, the reservoir and trap characteristic and reservoir cap combination study in step S2) is specifically:
analyzing the control effect of different raw storage cover combination types on oil gas enrichment and storage based on the regional research data obtained in the step S1), and revealing favorable storage cover combination patterns and forming conditions;
by analyzing the structure and the oil-gas distribution characteristics and differences of each layer system in a research area, the sealing condition and the sealing performance of a local cover layer are intensively researched on the premise that two regional top and bottom cover layers are definite, and the quality of the sealing condition of the local cover layer is evaluated;
according to the matching relation between the structural deformation period and the hydrocarbon generation and expulsion period of the hydrocarbon source rock, the key time of oil and gas reservoir formation is pointed out, and then the trap effectiveness is evaluated.
Further, the research on the oil and gas transportation, gathering and transportation system in the step S2) is specifically as follows:
on the basis of the geological data of the target oil field, simultaneously researching the geological data of the adjacent area, and implementing oil-gas sources of different structures and different layer series;
determining the oil gas migration directions of different geological periods in a transportation and conduction system of a research area on the basis of the existing oil gas geochemical characteristic analysis;
through the research on the oil and gas migration direction and path channels in the research area, the configuration relation between the fault plane, the unconformity plane and the main transportation layer is analyzed, the geometrical shape and the development scale of a transportation and conduction system of the fracture and associated fracture and the transportation and conduction effect on the oil and gas migration are researched, and the oil and gas transportation, gathering and conduction mode in the research area is established by combining the space-time matching relation of oil and gas reservoir formation.
Further, the secondary study of the oil-gas injection period in the step S2) is specifically as follows: in-situ testing is carried out on oil inclusion and oil in reservoir pores to obtain migration and reserve period times of oil and gas.
Further, the research on the differential aggregation mode of the heavy oil and the light oil in the step S2) is specifically as follows:
based on the crude oil and reservoir geological data of the main target layer, the distribution rule of the heavy oil and the light oil in the longitudinal direction and the transverse direction is explored.
Further, the above studies have adopted techniques including: the method comprises a hydrocarbon source rock evaluation technology, a seismic reservoir prediction technology and a reservoir formation element space-time configuration relation analysis technology.
Compared with the prior art, the invention has the following advantages and beneficial effects:
the screening evaluation method of the oil and gas reservoir favorable area provided by the invention is based on 3D earthquake, well logging and core data, and analyzes fracture development characteristics; by developing hydrocarbon source rock evaluation work, determining dominant hydrocarbon source rock and hydrocarbon generation and discharge history thereof; according to the matching relation between the structural deformation period and the hydrocarbon generation and discharge period of the hydrocarbon source rock, indicating the key time of oil and gas reservoir formation; and then reservoir spreading, trapping, a transportation and conduction system and the like are integrated, main oil and gas enrichment factors are determined, favorable oil and gas accumulation zones are pointed out, and the favorable zones are obtained and evaluated for favorable targets.
The screening and evaluating method for the oil and gas reservoir favorable area has guiding significance for increasing, storing and increasing production in the oil field exploration and development process, such as well position arrangement, reserve assessment, development scheme compilation and the like, so that the oil field exploration and development efficiency and economic benefit are effectively improved.
Drawings
The following drawings are included to provide a further understanding of embodiments of the invention, and are incorporated in and constitute a part of this application. In the drawings:
FIG. 1 is a schematic flow chart of a screening evaluation method of an oil and gas reservoir formation favorable area in the embodiment of the invention.
Detailed Description
The present invention is further described in detail below with reference to examples, which are provided to assist those skilled in the art in further understanding the present invention, but are not intended to limit the present invention in any way. It should be noted that various changes and modifications can be made by those skilled in the art without departing from the spirit of the invention, and these changes and modifications are all within the scope of the invention.
Example 1:
as shown in fig. 1, the exploration and development of the east bagatenan oil field (EBS) is taken as an example. The EBS field is generally a north west-south east oriented anticline reservoir where EBS demonstrates oil bearing formations such as Hartha, Sa' adi, Tanuma, Khasib and Zubair with geological reserves of 77.6 billion barrels, with Hartha, Tanuma, Khasib and Zubair being the most dominant oil bearing formations. Hartha, Sa' adi, Tanuma and Khasib are carbonate reservoirs and have the characteristics of high porosity and low permeability; zubair is a sandstone reservoir, has the characteristics of medium-high porosity and medium-high permeability, and has complex oil-water distribution.
The upper carbonate rock stratum system is influenced by structure and deposition change, so that the reservoir control factors are unclear, and the oil gas enrichment rule is unclear. The thickness of sand bodies of the Zubair reservoir stratum at the lower clastic rock layer is thin, the average single-layer thickness is less than 3 meters, and the spreading characteristics and connectivity of the sand bodies are further defined; the new well drilling shows that the thickness change of each small layer of the Zubair (Z5-Z6) is large, the oil-water relationship is complex, and the transverse spreading rule of the oil layer is not clear.
Therefore, in order to clarify the control effect of the structure and lithology on oil and gas enrichment, the difference enrichment rule of heavy oil and light oil, the reservoir distribution and communication relationship, the oil-water relationship and the like, the screening and evaluation method of the oil and gas reservoir favorable area is adopted, and comprises the following steps:
s1): carrying out regional data research;
s2): according to the regional data research results, various researches are carried out, including:
hydrocarbon source rock evaluation and hydrocarbon generation and discharge history research, reservoir and trap characteristics and reservoir cap combination research, oil and gas transportation and transportation system research, oil and gas injection period secondary research, and heavy oil and light oil difference aggregation mode research;
s3): on the basis of various researches, main control factors of oil-gas enrichment reserves are indicated;
s4): on the basis of the analysis of the main control factors of the oil-gas enrichment reservoir, researching the oil-gas distribution rule and establishing an oil-gas reservoir forming mode;
s5): and (4) indicating a favorable oil and gas accumulation zone, and implementing the zone into a reservoir favorable zone to evaluate favorable targets.
Further, the area data in step S1) includes: the core/rock debris, well logging data, seismic data and oil testing and production testing data.
Further, the well log data comprises: depth, deep lateral resistivity, shallow lateral resistivity, sonic moveout, caliper, natural gamma, and natural potential.
Further, the hydrocarbon source rock evaluation and hydrocarbon generation and expulsion history study in the step S2) is specifically as follows:
evaluating the abundance, type and maturity of the source rocks by using the pyrolysis parameters of J, K source rocks on the region, and summarizing the geochemical characteristics of the source rocks;
and summarizing the history of hydrocarbon generation and discharge of the main hydrocarbon source rock in the research area by combining the logging information and the core analysis test result.
Further, the reservoir and trap characteristic and reservoir cap combination study in step S2) is specifically:
analyzing the control effect of different raw storage cover combination types on oil gas enrichment and storage based on the regional research data obtained in the step S1), and revealing favorable storage cover combination patterns and forming conditions;
by analyzing the structure and the oil-gas distribution characteristics and differences of each layer system in a research area, the sealing condition and the sealing performance of a local cover layer are intensively researched on the premise that two regional top and bottom cover layers are definite, and the quality of the sealing condition of the local cover layer is evaluated;
according to the matching relation between the structural deformation period and the hydrocarbon generation and expulsion period of the hydrocarbon source rock, the key time of oil and gas reservoir formation is pointed out, and then the trap effectiveness is evaluated.
Further, the research on the oil and gas transportation, gathering and transportation system in the step S2) is specifically as follows:
on the basis of the geological data of the target oil field, simultaneously researching the geological data of the adjacent area, and implementing oil-gas sources of different structures and different layer series;
determining the oil gas migration directions of different geological periods in a transportation and conduction system of a research area on the basis of the existing oil gas geochemical characteristic analysis;
through the research on the oil and gas migration direction and path channels in the research area, the configuration relation between the fault plane, the unconformity plane and the main transportation layer is analyzed, the geometrical shape and the development scale of a transportation and conduction system of the fracture and associated fracture and the transportation and conduction effect on the oil and gas migration are researched, and the oil and gas transportation, gathering and conduction mode in the research area is established by combining the space-time matching relation of oil and gas reservoir formation.
Further, the secondary study of the oil-gas injection period in the step S2) is specifically as follows: in-situ testing is carried out on oil inclusion and oil in reservoir pores to obtain migration and reserve period times of oil and gas.
Further, the research on the differential aggregation mode of the heavy oil and the light oil in the step S2) is specifically as follows:
based on the crude oil and reservoir geological data of the main target layer, the distribution rule of the heavy oil and the light oil in the longitudinal direction and the transverse direction is explored.
Further, the above studies have adopted techniques including: the method comprises a hydrocarbon source rock evaluation technology, a seismic reservoir prediction technology and a reservoir formation element space-time configuration relation analysis technology.
By the method for screening and evaluating the favorable region of the oil-gas reservoir, the oil-gas reservoir conditions of the EBS oil field can be determined, favorable target evaluation can be developed, the drilling success rate is improved, the productivity construction is accelerated, and the oil reservoir exploration and development efficiency and the economic benefit are improved.
The foregoing description of specific embodiments of the present invention has been presented. It is to be understood that the present invention is not limited to the specific embodiments described above, and that various changes or modifications may be made by one skilled in the art within the scope of the appended claims without departing from the spirit of the invention. The embodiments and features of the embodiments of the present application may be combined with each other arbitrarily without conflict.
Claims (9)
1. A method for screening and evaluating an oil and gas deposit favorable area is characterized by comprising the following steps:
s1): carrying out regional data research;
s2): according to the regional data research results, various researches are carried out, including:
hydrocarbon source rock evaluation and hydrocarbon generation and discharge history research, reservoir and trap characteristics and reservoir cap combination research, oil and gas transportation and transportation system research, oil and gas injection period secondary research, and heavy oil and light oil difference aggregation mode research;
s3): on the basis of various researches, main control factors of oil-gas enrichment reserves are indicated;
s4): on the basis of the analysis of the main control factors of the oil-gas enrichment reservoir, researching the oil-gas distribution rule and establishing an oil-gas reservoir forming mode;
s5): and (4) indicating a favorable oil and gas accumulation zone, and implementing the zone into a reservoir favorable zone to evaluate favorable targets.
2. The method of claim 1, wherein the regional data in step S1) includes: the core/rock debris, well logging data, seismic data and oil testing and production testing data.
3. The method of claim 2, wherein the well log data comprises: depth, deep lateral resistivity, shallow lateral resistivity, sonic moveout, caliper, natural gamma, and natural potential.
4. The method for screening and evaluating the hydrocarbon reservoir profitable area according to claim 2, wherein the hydrocarbon source rock evaluation and hydrocarbon generation and expulsion history study in the step S2) is specifically as follows:
evaluating the abundance, type and maturity of the source rocks by using the pyrolysis parameters of J, K source rocks on the region, and summarizing the geochemical characteristics of the source rocks;
and summarizing the history of hydrocarbon generation and discharge of the main hydrocarbon source rock in the research area by combining the logging information and the core analysis test result.
5. The method for screening and evaluating the hydrocarbon reservoir advantageous zones as claimed in claim 1, wherein the reservoir and trap characteristic and reservoir cap combined study in step S2) is specifically as follows:
analyzing the control effect of different raw storage cover combination types on oil gas enrichment and storage based on the regional research data obtained in the step S1), and revealing favorable storage cover combination patterns and forming conditions;
by analyzing the structure and the oil-gas distribution characteristics and differences of each layer system in a research area, the sealing condition and the sealing performance of a local cover layer are intensively researched on the premise that two regional top and bottom cover layers are definite, and the quality of the sealing condition of the local cover layer is evaluated;
according to the matching relation between the structural deformation period and the hydrocarbon generation and expulsion period of the hydrocarbon source rock, the key time of oil and gas reservoir formation is pointed out, and then the trap effectiveness is evaluated.
6. The method for screening and evaluating the oil and gas deposit favorable area according to claim 1, wherein the research on the oil and gas transportation and gathering conducting system in the step S2) is specifically as follows:
on the basis of the geological data of the target oil field, simultaneously researching the geological data of the adjacent area, and implementing oil-gas sources of different structures and different layer series;
determining the oil gas migration directions of different geological periods in a transportation and conduction system of a research area on the basis of the existing oil gas geochemical characteristic analysis;
through the research on the oil and gas migration direction and path channels in the research area, the configuration relation between the fault plane, the unconformity plane and the main transportation layer is analyzed, the geometrical shape and the development scale of a transportation and conduction system of the fracture and associated fracture and the transportation and conduction effect on the oil and gas migration are researched, and the oil and gas transportation, gathering and conduction mode in the research area is established by combining the space-time matching relation of oil and gas reservoir formation.
7. The method for screening and evaluating the hydrocarbon deposit favorable area according to claim 1, wherein the secondary research of the hydrocarbon injection period in the step S2) is specifically as follows: in-situ testing is carried out on oil inclusion and oil in reservoir pores to obtain migration and reserve period times of oil and gas.
8. The method for screening and evaluating the hydrocarbon deposit profitable area according to claim 1, wherein the research on the differential aggregation mode of the heavy oil and the light oil in the step S2) is specifically as follows:
based on the crude oil and reservoir geological data of the main target layer, the distribution rule of the heavy oil and the light oil in the longitudinal direction and the transverse direction is explored.
9. The method of claim 1, wherein the research technique comprises: the method comprises a hydrocarbon source rock evaluation technology, a seismic reservoir prediction technology and a reservoir formation element space-time configuration relation analysis technology.
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Application publication date: 20210402 |