Forming mechanism of the Ordovician karst carbonate reservoirs on the northern slope of central Tarim Basin
The Ordovician karst carbonate reservoirs on the northern slope of central Tarim Basin are important oil and gas exploration targets in the basin, but their dissolution mechanisms are in controversy. In this paper, based on the integrated study of sedimentation, sequence and reservoir, together with...
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KeAi Communications Co., Ltd.
2017-07-01
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| Series: | Natural Gas Industry B |
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| Online Access: | http://www.sciencedirect.com/science/article/pii/S2352854017301158 |
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| author | Heng Fu Jianhui Han Wanbin Meng Mingshi Feng Lei Hao Yanfei Gao Yueshan Guan |
| author_facet | Heng Fu Jianhui Han Wanbin Meng Mingshi Feng Lei Hao Yanfei Gao Yueshan Guan |
| author_sort | Heng Fu |
| collection | DOAJ |
| description | The Ordovician karst carbonate reservoirs on the northern slope of central Tarim Basin are important oil and gas exploration targets in the basin, but their dissolution mechanisms are in controversy. In this paper, based on the integrated study of sedimentation, sequence and reservoir, together with microscopic analysis and macroscopic seismic data analysis, the carbonate karst reservoirs in the study area were divided into three types: dissolved pore-cavity limestone reservoir, pore-cavity dolomite reservoir and fracture-cavity siliceous reservoir, and their forming mechanisms were discussed respectively. Some findings were obtained. First, dissolved pore-cavity limestone reservoirs are distributed in the upper Yingshan Fm and Yijianfang Fm of the Ordovician vertically, while pore-cavity dolomite reservoirs are mainly developed in the Penglai Fm and lower Yingshan Fm of the Ordovician with great thickness. Second, dissolved pore-cavity limestone reservoirs were formed by karstification on the third-order sequence boundary (lowstand tract), while pore-cavity dolomite reservoirs were formed by deep burial dolomitization controlled by karstification on the third-order sequence boundary, both of which are distributed in the highstand tract below the third-order sequence boundary. Third, siliceous reservoirs are developed under the control of faulting, as a result of reworking of deep hydrothermal fluids along faults to the limestone, and the siliceous reservoirs and their hydrothermal solution fracture-cavity systems are distributed near faults. It is further predicted that, in addition to the three types of reservoir above, platform-margin reef-flat reservoirs are developed in the Ordovician on the northern slope of central Tarim Basin. |
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| id | doaj.art-5980e2b78d1642f6bf1d19b16d43ac68 |
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| issn | 2352-8540 |
| language | English |
| last_indexed | 2025-03-22T03:36:14Z |
| publishDate | 2017-07-01 |
| publisher | KeAi Communications Co., Ltd. |
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| series | Natural Gas Industry B |
| spelling | doaj.art-5980e2b78d1642f6bf1d19b16d43ac682024-04-28T12:11:50ZengKeAi Communications Co., Ltd.Natural Gas Industry B2352-85402017-07-014429430410.1016/j.ngib.2017.03.001Forming mechanism of the Ordovician karst carbonate reservoirs on the northern slope of central Tarim BasinHeng Fu0Jianhui Han1Wanbin Meng2Mingshi Feng3Lei Hao4Yanfei Gao5Yueshan Guan6College of Energy, Chengdu University of Technology, Chengdu, Sichuan 610059, ChinaCollege of Energy, Chengdu University of Technology, Chengdu, Sichuan 610059, ChinaInstitute of Sedimentary Geology, Chengdu University of Technology, Chengdu, Sichuan 610059, ChinaInstitute of Sedimentary Geology, Chengdu University of Technology, Chengdu, Sichuan 610059, ChinaCollege of Energy, Chengdu University of Technology, Chengdu, Sichuan 610059, ChinaCollege of Energy, Chengdu University of Technology, Chengdu, Sichuan 610059, ChinaCollege of Energy, Chengdu University of Technology, Chengdu, Sichuan 610059, ChinaThe Ordovician karst carbonate reservoirs on the northern slope of central Tarim Basin are important oil and gas exploration targets in the basin, but their dissolution mechanisms are in controversy. In this paper, based on the integrated study of sedimentation, sequence and reservoir, together with microscopic analysis and macroscopic seismic data analysis, the carbonate karst reservoirs in the study area were divided into three types: dissolved pore-cavity limestone reservoir, pore-cavity dolomite reservoir and fracture-cavity siliceous reservoir, and their forming mechanisms were discussed respectively. Some findings were obtained. First, dissolved pore-cavity limestone reservoirs are distributed in the upper Yingshan Fm and Yijianfang Fm of the Ordovician vertically, while pore-cavity dolomite reservoirs are mainly developed in the Penglai Fm and lower Yingshan Fm of the Ordovician with great thickness. Second, dissolved pore-cavity limestone reservoirs were formed by karstification on the third-order sequence boundary (lowstand tract), while pore-cavity dolomite reservoirs were formed by deep burial dolomitization controlled by karstification on the third-order sequence boundary, both of which are distributed in the highstand tract below the third-order sequence boundary. Third, siliceous reservoirs are developed under the control of faulting, as a result of reworking of deep hydrothermal fluids along faults to the limestone, and the siliceous reservoirs and their hydrothermal solution fracture-cavity systems are distributed near faults. It is further predicted that, in addition to the three types of reservoir above, platform-margin reef-flat reservoirs are developed in the Ordovician on the northern slope of central Tarim Basin.http://www.sciencedirect.com/science/article/pii/S2352854017301158Central Tarim BasinOrdovicianCarbonate reservoirThird-order sequence boundary karstificationKarstification during lowstand tractBurial dolomitization |
| spellingShingle | Heng Fu Jianhui Han Wanbin Meng Mingshi Feng Lei Hao Yanfei Gao Yueshan Guan Forming mechanism of the Ordovician karst carbonate reservoirs on the northern slope of central Tarim Basin Natural Gas Industry B Central Tarim Basin Ordovician Carbonate reservoir Third-order sequence boundary karstification Karstification during lowstand tract Burial dolomitization |
| title | Forming mechanism of the Ordovician karst carbonate reservoirs on the northern slope of central Tarim Basin |
| title_full | Forming mechanism of the Ordovician karst carbonate reservoirs on the northern slope of central Tarim Basin |
| title_fullStr | Forming mechanism of the Ordovician karst carbonate reservoirs on the northern slope of central Tarim Basin |
| title_full_unstemmed | Forming mechanism of the Ordovician karst carbonate reservoirs on the northern slope of central Tarim Basin |
| title_short | Forming mechanism of the Ordovician karst carbonate reservoirs on the northern slope of central Tarim Basin |
| title_sort | forming mechanism of the ordovician karst carbonate reservoirs on the northern slope of central tarim basin |
| topic | Central Tarim Basin Ordovician Carbonate reservoir Third-order sequence boundary karstification Karstification during lowstand tract Burial dolomitization |
| url | http://www.sciencedirect.com/science/article/pii/S2352854017301158 |
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