| 四川盆地东部龙马溪组页岩气成藏地质条件对比分析 |
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| 作者姓名： | 李斌 郭庆勇 罗群 胡博文 晋长昊 |
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| 作者单位： | 1.神华地质勘查有限责任公司,北京 100022;2.中国石油大学(北京),北京 102249; |
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| 基金项目： | 国家自然科学基金“云质岩致密油储层微米—纳米孔喉网络体系及其流体耦合流动机理与流动下限(编号: 41372145)”项目资助 |
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| 摘 要： | 为了揭示四川盆地东部页岩气成藏地质规律,指导页岩气勘探部署,选取四川盆地东部焦石坝地区、彭水地区及湖南保靖地区进行页岩气成藏地质条件对比分析。结果表明: 在龙马溪沉积时期,四川盆地东部形成了前陆盆地,沉积了富含有机质的碳质页岩,为页岩气生成提供了物质条件; 前陆盆地沉积中心位于重庆一带,其碳质页岩厚度从中心向周围减薄,碳质页岩中有机质丰度由中心向周边减小,有机质成熟度由中心向周边降低,地层压力由中心向周边减小,生烃时间从西向东逐渐缩短; 渝东焦石坝地区页岩气储集空间以孔隙为主,湖南保靖地区储集空间以裂缝为主; 从西向东,储层中孔隙空间缩小,裂缝发育程度加大; 构造运动对页岩气产生破坏作用,由东向西逐渐减弱。综合分析认为,四川盆地东部从渝东焦石坝地区向湖南保靖地区,页岩气成藏条件逐渐变差,勘探难度增加。
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| 关 键 词： | 四川盆地 页岩气成藏地质条件 焦石坝 彭水 保靖 湖南 |
| 收稿时间： | 2017-11-23 |
Comparative analysis on geological condition of shale gas accumulation of Longmaxi Formation in eastern Sichuan Basin |
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| Authors: | LI Bin GUO Qingyong LUO Qun HU Bowen JIN Changhao |
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| Institution: | 1. Shenhua Geological Exploration Co., Ltd., Beijing 100022, China;2. China University of Petroleum (Beijing), Beijing 102249, China |
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| Abstract: | In order to reveal the geological regularity of shale gas reservoir in eastern Sichuan Basin, the geological conditions of shale gas accumulation in Jiaoshiba area, Pengshui area and Baojing area were analyzed and compared. The results show that foreland basin in eastern Sichuan Basin was formed in the deposition period of Longmaxi Formation, so enriched organic carbonaceous shale was deposited to provide material conditions for the generation of shale gas. The depositional center of the foreland basin was located in Chongqing, and carbonaceous shale thickness decreased from the center to the periphery. The abundance of organic matter in the carbonaceous shale, the maturity of the organic matter and formation pressure all decreased from the center to the periphery. The hydrocarbon generation time was shorter from west of the basin to the east. Shale gas reservoir in Jiaoshiba area was mainly with space pore, While it was mainly with fracture pore in Baojing area, Hunan Province. Reservoir pore space becomes narrow and the degree of fracture was increasing from west to east. Tectonic movement has great destructive effect on shale gas accumulation and it was gradually weakened from east to west. The comprehensive analysis shows that from Jiaoshiba area in the eastern part of Sichuan Basin to Baojing in Hunan, the shale gas accumulation conditions became worse and the difficulty of exploration was increasing. |
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| Keywords: | Sichuan Basin geological condition of shale gas accumulation Jiaoshiba Pengshui Baojing Hunan |
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