Dolomitization evolution and its effects on hydrocarbon reservoir formation from penecontemporaneous to deep burial environment
Aiming at the scientific problem that only part of dolomite acts as dolomite reservoir, this paper takes the multiple dolomite-bearing formations in the Tarim and Ordos basins, NW China and Sichuan Basin, SW China as the study object, by means of mineral petrological analysis and geochemical methods...
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| Format: | Article |
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KeAi Communications Co., Ltd.
2022-01-01
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| Series: | Petroleum Exploration and Development |
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| Online Access: | http://www.sciencedirect.com/science/article/pii/S1876380422603069 |
| _version_ | 1817999542993289216 |
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| author | Anjiang SHEN Xianying LUO Anping HU Zhanfeng QIAO Jie ZHANG |
| author_facet | Anjiang SHEN Xianying LUO Anping HU Zhanfeng QIAO Jie ZHANG |
| author_sort | Anjiang SHEN |
| collection | DOAJ |
| description | Aiming at the scientific problem that only part of dolomite acts as dolomite reservoir, this paper takes the multiple dolomite-bearing formations in the Tarim and Ordos basins, NW China and Sichuan Basin, SW China as the study object, by means of mineral petrological analysis and geochemical methods including carbonate clumped isotope, U-Pb isotopic dating, etc., to rebuild the dolomitization pathway and evaluate its effects on reservoir formation. On the basis of detailed rock thin section observation, five dolomitic structural components are identified, including original fabric-retained dolomite (microbial and/or micrite structure), buried metasomatic dolomite I (subhedral–euhedral fine, medium and coarse crystalline structure), buried metasomatic dolomite II (allotriomorphic–subhedral fine, medium and coarse crystalline structure), buried precipitation dolomite and coarse crystalline saddle dolomite. Among them, the first three exist in the form of rocks, the latter two occur as dolomite minerals filling in pores and fractures. The corresponding petrological and geochemical identification templates for them are established. Based on the identification of the five dolomitic structural components, six dolomitization pathways for three types of reservoirs (preserved dolomite, reworked dolomite and limestone buried dolomitization) are distinguished. The initial porosity of the original rock before dolomitization and the dolomitization pathway are the main factors controlling the development of dolomite reservoirs. The preserved dolomite and reworked dolomite types have the most favorable dolomitization pathway for reservoir formation, and are large scale and controlled by sedimentary facies in development and distribution, making them the first choices for oil and gas exploration in deep carbonate formations. |
| first_indexed | 2024-04-14T03:10:19Z |
| format | Article |
| id | doaj.art-4d630fcd8953447c9e94b6ec48c0e632 |
| institution | Directory Open Access Journal |
| issn | 1876-3804 |
| language | English |
| last_indexed | 2024-04-14T03:10:19Z |
| publishDate | 2022-01-01 |
| publisher | KeAi Communications Co., Ltd. |
| record_format | Article |
| series | Petroleum Exploration and Development |
| spelling | doaj.art-4d630fcd8953447c9e94b6ec48c0e6322022-12-22T02:15:36ZengKeAi Communications Co., Ltd.Petroleum Exploration and Development1876-38042022-01-01494731743Dolomitization evolution and its effects on hydrocarbon reservoir formation from penecontemporaneous to deep burial environmentAnjiang SHEN0Xianying LUO1Anping HU2Zhanfeng QIAO3Jie ZHANG4PetroChina Hangzhou Institute of Petroleum Geology, Hangzhou 310023, China; Key Laboratory of Carbonate Reservoirs, CNPC, Hangzhou 310023, ChinaPetroChina Hangzhou Institute of Petroleum Geology, Hangzhou 310023, China; Key Laboratory of Carbonate Reservoirs, CNPC, Hangzhou 310023, China; Corresponding authorPetroChina Hangzhou Institute of Petroleum Geology, Hangzhou 310023, China; Key Laboratory of Carbonate Reservoirs, CNPC, Hangzhou 310023, ChinaPetroChina Hangzhou Institute of Petroleum Geology, Hangzhou 310023, China; Key Laboratory of Carbonate Reservoirs, CNPC, Hangzhou 310023, ChinaPetroChina Hangzhou Institute of Petroleum Geology, Hangzhou 310023, China; Key Laboratory of Carbonate Reservoirs, CNPC, Hangzhou 310023, ChinaAiming at the scientific problem that only part of dolomite acts as dolomite reservoir, this paper takes the multiple dolomite-bearing formations in the Tarim and Ordos basins, NW China and Sichuan Basin, SW China as the study object, by means of mineral petrological analysis and geochemical methods including carbonate clumped isotope, U-Pb isotopic dating, etc., to rebuild the dolomitization pathway and evaluate its effects on reservoir formation. On the basis of detailed rock thin section observation, five dolomitic structural components are identified, including original fabric-retained dolomite (microbial and/or micrite structure), buried metasomatic dolomite I (subhedral–euhedral fine, medium and coarse crystalline structure), buried metasomatic dolomite II (allotriomorphic–subhedral fine, medium and coarse crystalline structure), buried precipitation dolomite and coarse crystalline saddle dolomite. Among them, the first three exist in the form of rocks, the latter two occur as dolomite minerals filling in pores and fractures. The corresponding petrological and geochemical identification templates for them are established. Based on the identification of the five dolomitic structural components, six dolomitization pathways for three types of reservoirs (preserved dolomite, reworked dolomite and limestone buried dolomitization) are distinguished. The initial porosity of the original rock before dolomitization and the dolomitization pathway are the main factors controlling the development of dolomite reservoirs. The preserved dolomite and reworked dolomite types have the most favorable dolomitization pathway for reservoir formation, and are large scale and controlled by sedimentary facies in development and distribution, making them the first choices for oil and gas exploration in deep carbonate formations.http://www.sciencedirect.com/science/article/pii/S1876380422603069dolomitizationdolomitization pathwaydolomite reservoircarbonatespenecontemporaneous environmentburial environment |
| spellingShingle | Anjiang SHEN Xianying LUO Anping HU Zhanfeng QIAO Jie ZHANG Dolomitization evolution and its effects on hydrocarbon reservoir formation from penecontemporaneous to deep burial environment Petroleum Exploration and Development dolomitization dolomitization pathway dolomite reservoir carbonates penecontemporaneous environment burial environment |
| title | Dolomitization evolution and its effects on hydrocarbon reservoir formation from penecontemporaneous to deep burial environment |
| title_full | Dolomitization evolution and its effects on hydrocarbon reservoir formation from penecontemporaneous to deep burial environment |
| title_fullStr | Dolomitization evolution and its effects on hydrocarbon reservoir formation from penecontemporaneous to deep burial environment |
| title_full_unstemmed | Dolomitization evolution and its effects on hydrocarbon reservoir formation from penecontemporaneous to deep burial environment |
| title_short | Dolomitization evolution and its effects on hydrocarbon reservoir formation from penecontemporaneous to deep burial environment |
| title_sort | dolomitization evolution and its effects on hydrocarbon reservoir formation from penecontemporaneous to deep burial environment |
| topic | dolomitization dolomitization pathway dolomite reservoir carbonates penecontemporaneous environment burial environment |
| url | http://www.sciencedirect.com/science/article/pii/S1876380422603069 |
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