Re-recognition of “unconventional” in unconventional oil and gas
Taking the Wufeng–Longmaxi shale gas in the Sichuan Basin as a typical example, based on the new progress in exploration and development, this study re-examines the “unconventional” of unconventional oil and gas from two aspects: oil and gas formation and accumulation mechanisms, and main features o...
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| Format: | Article |
| Language: | English |
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KeAi Communications Co., Ltd.
2019-10-01
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| Series: | Petroleum Exploration and Development |
| Online Access: | http://www.sciencedirect.com/science/article/pii/S1876380419602442 |
| _version_ | 1818912231568441344 |
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| author | Fangzheng JIAO |
| author_facet | Fangzheng JIAO |
| author_sort | Fangzheng JIAO |
| collection | DOAJ |
| description | Taking the Wufeng–Longmaxi shale gas in the Sichuan Basin as a typical example, based on the new progress in exploration and development, this study re-examines the “unconventional” of unconventional oil and gas from two aspects: oil and gas formation and accumulation mechanisms, and main features of oil and gas layers. The oil and gas of continuous accumulation and distribution from integrated source and reservoir is unconventional oil and gas, and the study focusing on shale oil and gas in comparison with conventional oil and gas has made progress in five aspects: (1) Unconventional oil and gas have source-reservoir-in-one and in-situ accumulation; according to the theory of continuous oil and gas accumulation, the accumulation power of oil and gas is overpressure and diffusion; for conventional oil and gas, the source and reservoir are different formations, the trapping accumulation is its theoretical foundation, and the accumulation power is characterized by buoyancy and capillary force. (2) The unconventional oil and gas reservoirs are mainly formed in the low-energy oxygen-anaerobic environment, dominantly semi-deep to deep shelf facies and the semi-deep to deep lake facies, simple in lithology, rich in organic matter and clay minerals; conventional oil and gas mainly occur in coarse-grained sedimentary rocks formed in high-energy waters with complex lithology. (3) The unconventional oil and gas reservoirs have mainly nano-scale pores, of which organic matter pores take a considerable proportion; conventional oil and gas reservoirs mainly have micron-millimeter pores and no organic matter pores. (4) Unconventional shale oil and gas reservoirs have oil and gas in uniform distribution, high oil and gas saturation, low or no water content, and no obvious oil and gas water boundary; conventional oil and gas reservoirs have oil and gas of complex properties, moderate oil and gas saturation, slightly higher water content, and obvious oil, gas and water boundaries. (5) Organic-rich shale is the main target of unconventional oil and gas exploration; the sedimentary environment controls high organic matter abundance zone and organic matter content controls oil and gas abundance; positive structure and high porosity control the yields of shale wells; bedding and fracture development are important factors deciding high yield. Key words: unconventional oil and gas, theoretical connotation, shale oil and gas, hydrocarbon accumulation dynamics, organic matter, fine grain deposition, Wufeng–Longmaxi Formations, Sichuan Basin |
| first_indexed | 2024-12-19T23:11:19Z |
| format | Article |
| id | doaj.art-0acdbbf6848c491cb14aa19eb5cb2c83 |
| institution | Directory Open Access Journal |
| issn | 1876-3804 |
| language | English |
| last_indexed | 2024-12-19T23:11:19Z |
| publishDate | 2019-10-01 |
| publisher | KeAi Communications Co., Ltd. |
| record_format | Article |
| series | Petroleum Exploration and Development |
| spelling | doaj.art-0acdbbf6848c491cb14aa19eb5cb2c832022-12-21T20:02:12ZengKeAi Communications Co., Ltd.Petroleum Exploration and Development1876-38042019-10-01465847855Re-recognition of “unconventional” in unconventional oil and gasFangzheng JIAO0Corresponding author; China National Petroleum Corporation, Beijing 100007, ChinaTaking the Wufeng–Longmaxi shale gas in the Sichuan Basin as a typical example, based on the new progress in exploration and development, this study re-examines the “unconventional” of unconventional oil and gas from two aspects: oil and gas formation and accumulation mechanisms, and main features of oil and gas layers. The oil and gas of continuous accumulation and distribution from integrated source and reservoir is unconventional oil and gas, and the study focusing on shale oil and gas in comparison with conventional oil and gas has made progress in five aspects: (1) Unconventional oil and gas have source-reservoir-in-one and in-situ accumulation; according to the theory of continuous oil and gas accumulation, the accumulation power of oil and gas is overpressure and diffusion; for conventional oil and gas, the source and reservoir are different formations, the trapping accumulation is its theoretical foundation, and the accumulation power is characterized by buoyancy and capillary force. (2) The unconventional oil and gas reservoirs are mainly formed in the low-energy oxygen-anaerobic environment, dominantly semi-deep to deep shelf facies and the semi-deep to deep lake facies, simple in lithology, rich in organic matter and clay minerals; conventional oil and gas mainly occur in coarse-grained sedimentary rocks formed in high-energy waters with complex lithology. (3) The unconventional oil and gas reservoirs have mainly nano-scale pores, of which organic matter pores take a considerable proportion; conventional oil and gas reservoirs mainly have micron-millimeter pores and no organic matter pores. (4) Unconventional shale oil and gas reservoirs have oil and gas in uniform distribution, high oil and gas saturation, low or no water content, and no obvious oil and gas water boundary; conventional oil and gas reservoirs have oil and gas of complex properties, moderate oil and gas saturation, slightly higher water content, and obvious oil, gas and water boundaries. (5) Organic-rich shale is the main target of unconventional oil and gas exploration; the sedimentary environment controls high organic matter abundance zone and organic matter content controls oil and gas abundance; positive structure and high porosity control the yields of shale wells; bedding and fracture development are important factors deciding high yield. Key words: unconventional oil and gas, theoretical connotation, shale oil and gas, hydrocarbon accumulation dynamics, organic matter, fine grain deposition, Wufeng–Longmaxi Formations, Sichuan Basinhttp://www.sciencedirect.com/science/article/pii/S1876380419602442 |
| spellingShingle | Fangzheng JIAO Re-recognition of “unconventional” in unconventional oil and gas Petroleum Exploration and Development |
| title | Re-recognition of “unconventional” in unconventional oil and gas |
| title_full | Re-recognition of “unconventional” in unconventional oil and gas |
| title_fullStr | Re-recognition of “unconventional” in unconventional oil and gas |
| title_full_unstemmed | Re-recognition of “unconventional” in unconventional oil and gas |
| title_short | Re-recognition of “unconventional” in unconventional oil and gas |
| title_sort | re recognition of unconventional in unconventional oil and gas |
| url | http://www.sciencedirect.com/science/article/pii/S1876380419602442 |
| work_keys_str_mv | AT fangzhengjiao rerecognitionofunconventionalinunconventionaloilandgas |