| 琼东南盆地深水东区Y8-1含气构造天然气来源及侧向运聚模式 |
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| 引用本文： | 张迎朝,甘军,徐新德,梁刚,李兴.琼东南盆地深水东区Y8-1含气构造天然气来源及侧向运聚模式[J].地球科学,2019,44(8):2609-2618. |
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| 作者姓名： | 张迎朝 甘军 徐新德 梁刚 李兴 |
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| 作者单位： | 中海石油(中国)有限公司湛江分公司, 广东湛江 524057 |
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| 基金项目： | 国家“十三五”科技重大专项《琼东南盆地深水区大中型气田勘探关键技术》2016ZX05026-002 |
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| 摘 要： | 综合钻井天然气地球化学、地震资料，分析了琼东南盆地深水东区Y8-1构造天然气成因、来源及侧向运聚模式.天然气轻烃C6、C7组成分析表明，Y8-1构造天然气既有别于松东凹陷北坡的油型气，也不同于深水L17-2气田的煤型气.根据天然气乙烷、丙烷碳同位素特征，判断Y8-1构造天然气具有煤型气和油型气混合成因特征.选择盆地东部典型煤型气、油型气作为端元，计算得到Y8-1构造天然气中煤型气占53.3%、油型气占46.7%，分别来源于松南-宝岛凹陷下渐新统崖城组陆源海相烃源岩、始新统湖相烃源岩，两套烃源岩均具备生成成熟-高成熟天然气的地质条件.松南-宝岛凹陷中烃源岩生成的天然气沿断裂、构造脊、砂岩层侧向长距离运移，在Y8-1崖城组、花岗岩基岩圈闭中聚集成藏.
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| 关 键 词： | 天然气成因 轻烃 碳 混源气 深水东区 琼东南盆地 |
| 收稿时间： | 2019-02-03 |
The Source and Natural Gas Lateral Migration Accumulation Model of Y8-1 Gas Bearing Structure,East Deep Water in the Qiongdongnan Basin |
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| Abstract: | Based on the geochemical analyses of natural gases and seismic exploration data,the genesis,sources and lateral migration accumulation of Y8-1 bearing structure were comprehensively analyzed in the East deep water of the Qiongdong Basin. The analyses of C6,C7 light hydrocarbons show that the natural gas of the Y8-1 bearing structure is different from oil-type gas in the northern slope of Songdong sag,and coal-type gas of L17-2 gas field in the deepwater as well. According to the ethane and the propane carbon isotope,the natural gas in the Y8-1 bearing structurehas the mixing characteristics of coal-type gas and oil-type gas. The typical coal-type gas and the oil-type gas in the east Qiongdongnan Basin are selected to be end elements,the natural gas ethane carbon isotope of the Y8-1 bearing structure is calculated as coal-type gas for 53.3% and oil-type gas for 46.7% in the natural gas. The Y8-1 mixing source gas derived from the terrestrial marine source rock of Lower Oligocene Yacheng formation and Eocene lacustrine source rock in Songnan-Baodao sag respectively,and both sets of source rocks have geological conditions for the formation of mature-high mature natural gas. The natural gas generated from the source rocks in the Songnan,Baodao sags migrates along the tectonic ridges,faults,and sandstone carriers for a long distance,thenaccumulatedin the Yacheng formation and granite basement traps in the Songnan low-uplift,East deep water of the Qiongdong Basin. |
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