| 北部湾盆地涠西南凹陷碳酸盐岩潜山表生岩溶储层特征与演化模式 |
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| 关键词:Weixi’nan Sag buried hill carbonate reservoirs epikarst evolvement model Carboniferous |
| 基金项目:中海石油(中国)有限公司湛江分公司重点研究项目(编号: CCL2020ZJFN0294) |
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| 摘要: |
| Characteristics and Evolvement Model of Epigenetic Karst Reservoirs in Carbonate Buried Hill in Weixi’nan Sag, Beibuwan Basin |
| Buried hill reservoirs are important conditions for buried hill hydrocarbon accumulations. Buried hill area is one of the important subsequent exploration areas in Weixi’nan Sag. This study comprehensively used core observation, thin section identification, carbon-oxygen isotope measurement, inclusion temperature measurement, and drilling and logging data to conduct research on carbonate buried hill reservoirs in Weixi’nan Sag. Results showed that the carbonate buried hill reservoirs in Weixi’nan were mainly karst reservoirs. There were three types of karstifications, and they included depositional-interregional karst, buried karst, and epikarst. Among them, the epikarst is the most common karstification in the work area. The epikarst reservoirs zones were vertically divided into subsurface zone, vadose zone, and lenticular phreatic zone. Each epikarst reservoirs zone can be compared horizontally. The controlling factors of carbonate karst reservoirs in the work area mainly contained sedimentary facies, paleo-geomorphic, and late tectonic movements. It was proposed that dolomites in the tidal-flat zone was a more favorable lithology for reservoirs development. The karst slopes were favorable paleo-geomorphic in the area. Cenozoic faults had adjusted the original distribution depths of the karst reservoirs zones and led to different distribution depths of the karst reservoirs zones among the different buried hills today. |
| WANG Yong-hui,ZHANG You-hao,GAO Xian-zhi,SONG Yan,WANG Hong-mei,QU Fu-tao.2022.Characteristics and Evolvement Model of Epigenetic Karst Reservoirs in Carbonate Buried Hill in Weixi’nan Sag, Beibuwan Basin[J].Acta Geoscientica Sinica,43(5):676-688. |
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