| 东非海岸坦桑尼亚和鲁伍马盆地天然气成藏机理 |
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| 引用本文： | 梁建设,孔令武,邱春光,李华,贾屾,龙旭.东非海岸坦桑尼亚和鲁伍马盆地天然气成藏机理[J].地球科学,2021,46(8):2919-2933. |
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| 作者姓名： | 梁建设 孔令武 邱春光 李华 贾屾 龙旭 |
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| 作者单位： | 1.中海油国际有限公司, 北京 100028 |
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| 基金项目： | 国家重大科技项目2017ZX05032-002 |
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| 摘 要： | 东非海岸盆地天然气资源丰富，是世界天然气勘探的热点地区.东非海岸重点盆地的天然气为腐泥型高温裂解气，主要来源于下侏罗统局限海相优质烃源岩.大型断裂控制了东非海岸重点盆地天然气的垂向运移，研究区主要发育大型伸展断裂和大型走滑断裂.大型走滑断裂是坦桑尼亚盆地南部天然气藏的主要运移通道，其主要活动时期为晚白垩世-古新世，控制了白垩系-古近系浊积砂岩气藏的油气运移成藏.大型伸展断裂是鲁伍马盆地天然气藏的主要运移通道，其主要活动时期为古新世、渐新世和新近纪，控制了古近系浊积砂岩气藏的油气运移成藏.砂体规模控制了深水区岩性或构造-岩性圈闭的大小，进而控制了天然气藏的规模.受天然气运移方式的控制，东非海岸盆地形成了大型走滑断裂控藏模式和大型伸展断裂控藏模式.
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| 关 键 词： | 油气来源 烃源岩 断裂类型 油气运移 浊积体 成藏模式 石油地质学 |
| 收稿时间： | 2020-07-27 |
Gas Accumulation Mechanism in East Africa Coastal Key Basins |
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| Liang Jianshe,Kong Lingwu,Qiu Chunguang,Li Hua,Jia Shen,Long Xu.Gas Accumulation Mechanism in East Africa Coastal Key Basins[J].Earth Science-Journal of China University of Geosciences,2021,46(8):2919-2933. |
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| Authors: | Liang Jianshe Kong Lingwu Qiu Chunguang Li Hua Jia Shen Long Xu |
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| Abstract: | East Africa coastal basins are prolific in natural gas resources and are the hot spots of natural gas exploration in the world. The natural gas in the key East Africa coastal basins is sapropelic thermal gas, which mainly sourced from Lower Jurassic restricted marine high-quality source rocks. Large faults controlled the vertical migration of natural gas in the key East Africa coastal basins, where mainly developed large extensional faults and large strike-slip faults. The large strike-slip faults were main migration pathway of natural gas in the south of Tanzania Basin. Their main active period was from Late Cretaceous to Paleocene, which controlled the gas migration of the Cretaceous-Paleogene gas-bearing turbidite sandstone, while extensional faults were the main migration pathway of natural gas in Ruvuma Basin. Their main active period was Paleocene, Oligocene and Neogene, which controlled the gas migration of Paleogene gas-bearing turbidite sand stone. The type and size of turbidite sand controlled the size of lithological or structure-lithological trap in deepwater, and which in turn controlled the size of natural gas field. Due to the different migration modes of natural gas, East Africa coastal basins formed large strike-slip fault controlling accumulation model and large extensional fault controlling accumulation model. |
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