Structure characteristics and major controlling factors of platform margin microbial reef reservoirs: A case study of Xiaoerbulak Formation, Lower Cambrian, Aksu area, Tarim Basin, NW China
The structure characteristics and major controlling factors of platform margin microbial reef reservoirs in the Lower Cambrian Xiaoerbulak Formation in the Aksu area, Tarim Basin were analyzed based on 5 outcrop sections, 162 thin sections, 12 SEM samples, 52 sets of porosity and permeability data....
| Main Authors: | , , , , , , |
|---|---|
| Format: | Article |
| Language: | English |
| Published: |
KeAi Communications Co., Ltd.
2017-06-01
|
| Series: | Petroleum Exploration and Development |
| Online Access: | http://www.sciencedirect.com/science/article/pii/S1876380417300447 |
| _version_ | 1818349026641182720 |
|---|---|
| author | Ying BAI Ping LUO Shi WANG Chuanmin ZHOU Xiufen ZHAI Shan WANG Zongyu YANG |
| author_facet | Ying BAI Ping LUO Shi WANG Chuanmin ZHOU Xiufen ZHAI Shan WANG Zongyu YANG |
| author_sort | Ying BAI |
| collection | DOAJ |
| description | The structure characteristics and major controlling factors of platform margin microbial reef reservoirs in the Lower Cambrian Xiaoerbulak Formation in the Aksu area, Tarim Basin were analyzed based on 5 outcrop sections, 162 thin sections, 12 SEM samples, 52 sets of porosity and permeability data. Macroscopically, small-scale microbial reefs form the platform margin. A single microbial reef has several microbial reef progradation complexes, including reef front, fore reef, reef crest, and back reef, but microscopically, they have different kinds of microstructures. The reservoir spaces in the reefs can be divided into microbial structure reservoir space, including fenestral, frame, moldic, and oversized dissolution pores, and non-microbial structure reservoir space, including microcracks and stylolites. The statistical results of porosity and permeability show that in the Yutixi Section, porosity and permeability of the microbial reef reservoirs are generally below 5% and 1.0×10−3 μm2 respectively, characteristics of extremely low porosity and permeability reservoirs; while the reef reservoirs in the Sugaitebulake Section have a wide porosity range between 3% and 10%, and permeability range between 0.1×10−3 μm2 and 50×10−3 μm2 and strong heterogeneity, are low-medium porosity, low-medium permeability reservoirs. This demonstrates different microbial reefs have big differences in physical properties, and even the reservoir in the same reef has obvious heterogeneity. Paleotopography controls the formation of microbial reefs and sedimentation controls the facies distribution and the primary porosity development. Dissolution, controlled by the two former factors, finally decides evolution of reservoir pores. Key words: microbial reef, thrombolites, laminites, reservoirs, rimmed platform, Tarim Basin, Lower Cambrian, Xiaoerblak Formation |
| first_indexed | 2024-12-13T17:59:24Z |
| format | Article |
| id | doaj.art-8c4aca49117f44578200a2fe0f5d8c86 |
| institution | Directory Open Access Journal |
| issn | 1876-3804 |
| language | English |
| last_indexed | 2024-12-13T17:59:24Z |
| publishDate | 2017-06-01 |
| publisher | KeAi Communications Co., Ltd. |
| record_format | Article |
| series | Petroleum Exploration and Development |
| spelling | doaj.art-8c4aca49117f44578200a2fe0f5d8c862022-12-21T23:36:16ZengKeAi Communications Co., Ltd.Petroleum Exploration and Development1876-38042017-06-01443377386Structure characteristics and major controlling factors of platform margin microbial reef reservoirs: A case study of Xiaoerbulak Formation, Lower Cambrian, Aksu area, Tarim Basin, NW ChinaYing BAI0Ping LUO1Shi WANG2Chuanmin ZHOU3Xiufen ZHAI4Shan WANG5Zongyu YANG6PetroChina Research Institute of Petroleum Exploration & Development, Beijing 100083, China; School of Earth and Space Sciences, Peking University, Beijing 100871, ChinaPetroChina Research Institute of Petroleum Exploration & Development, Beijing 100083, China; School of Earth and Space Sciences, Peking University, Beijing 100871, China; Corresponding authorPetroleum Exploration & Production Research Institute, SINOPEC, Beijing 100083, ChinaPetroChina Research Institute of Petroleum Exploration & Development, Beijing 100083, ChinaPetroChina Research Institute of Petroleum Exploration & Development, Beijing 100083, ChinaPetroChina Research Institute of Petroleum Exploration & Development, Beijing 100083, ChinaPetroChina Research Institute of Petroleum Exploration & Development, Beijing 100083, China; School of Earth and Space Sciences, Peking University, Beijing 100871, ChinaThe structure characteristics and major controlling factors of platform margin microbial reef reservoirs in the Lower Cambrian Xiaoerbulak Formation in the Aksu area, Tarim Basin were analyzed based on 5 outcrop sections, 162 thin sections, 12 SEM samples, 52 sets of porosity and permeability data. Macroscopically, small-scale microbial reefs form the platform margin. A single microbial reef has several microbial reef progradation complexes, including reef front, fore reef, reef crest, and back reef, but microscopically, they have different kinds of microstructures. The reservoir spaces in the reefs can be divided into microbial structure reservoir space, including fenestral, frame, moldic, and oversized dissolution pores, and non-microbial structure reservoir space, including microcracks and stylolites. The statistical results of porosity and permeability show that in the Yutixi Section, porosity and permeability of the microbial reef reservoirs are generally below 5% and 1.0×10−3 μm2 respectively, characteristics of extremely low porosity and permeability reservoirs; while the reef reservoirs in the Sugaitebulake Section have a wide porosity range between 3% and 10%, and permeability range between 0.1×10−3 μm2 and 50×10−3 μm2 and strong heterogeneity, are low-medium porosity, low-medium permeability reservoirs. This demonstrates different microbial reefs have big differences in physical properties, and even the reservoir in the same reef has obvious heterogeneity. Paleotopography controls the formation of microbial reefs and sedimentation controls the facies distribution and the primary porosity development. Dissolution, controlled by the two former factors, finally decides evolution of reservoir pores. Key words: microbial reef, thrombolites, laminites, reservoirs, rimmed platform, Tarim Basin, Lower Cambrian, Xiaoerblak Formationhttp://www.sciencedirect.com/science/article/pii/S1876380417300447 |
| spellingShingle | Ying BAI Ping LUO Shi WANG Chuanmin ZHOU Xiufen ZHAI Shan WANG Zongyu YANG Structure characteristics and major controlling factors of platform margin microbial reef reservoirs: A case study of Xiaoerbulak Formation, Lower Cambrian, Aksu area, Tarim Basin, NW China Petroleum Exploration and Development |
| title | Structure characteristics and major controlling factors of platform margin microbial reef reservoirs: A case study of Xiaoerbulak Formation, Lower Cambrian, Aksu area, Tarim Basin, NW China |
| title_full | Structure characteristics and major controlling factors of platform margin microbial reef reservoirs: A case study of Xiaoerbulak Formation, Lower Cambrian, Aksu area, Tarim Basin, NW China |
| title_fullStr | Structure characteristics and major controlling factors of platform margin microbial reef reservoirs: A case study of Xiaoerbulak Formation, Lower Cambrian, Aksu area, Tarim Basin, NW China |
| title_full_unstemmed | Structure characteristics and major controlling factors of platform margin microbial reef reservoirs: A case study of Xiaoerbulak Formation, Lower Cambrian, Aksu area, Tarim Basin, NW China |
| title_short | Structure characteristics and major controlling factors of platform margin microbial reef reservoirs: A case study of Xiaoerbulak Formation, Lower Cambrian, Aksu area, Tarim Basin, NW China |
| title_sort | structure characteristics and major controlling factors of platform margin microbial reef reservoirs a case study of xiaoerbulak formation lower cambrian aksu area tarim basin nw china |
| url | http://www.sciencedirect.com/science/article/pii/S1876380417300447 |
| work_keys_str_mv | AT yingbai structurecharacteristicsandmajorcontrollingfactorsofplatformmarginmicrobialreefreservoirsacasestudyofxiaoerbulakformationlowercambrianaksuareatarimbasinnwchina AT pingluo structurecharacteristicsandmajorcontrollingfactorsofplatformmarginmicrobialreefreservoirsacasestudyofxiaoerbulakformationlowercambrianaksuareatarimbasinnwchina AT shiwang structurecharacteristicsandmajorcontrollingfactorsofplatformmarginmicrobialreefreservoirsacasestudyofxiaoerbulakformationlowercambrianaksuareatarimbasinnwchina AT chuanminzhou structurecharacteristicsandmajorcontrollingfactorsofplatformmarginmicrobialreefreservoirsacasestudyofxiaoerbulakformationlowercambrianaksuareatarimbasinnwchina AT xiufenzhai structurecharacteristicsandmajorcontrollingfactorsofplatformmarginmicrobialreefreservoirsacasestudyofxiaoerbulakformationlowercambrianaksuareatarimbasinnwchina AT shanwang structurecharacteristicsandmajorcontrollingfactorsofplatformmarginmicrobialreefreservoirsacasestudyofxiaoerbulakformationlowercambrianaksuareatarimbasinnwchina AT zongyuyang structurecharacteristicsandmajorcontrollingfactorsofplatformmarginmicrobialreefreservoirsacasestudyofxiaoerbulakformationlowercambrianaksuareatarimbasinnwchina |