焦石坝地区构造特征及页岩气保存模式研究
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摘要
针对焦石坝构造特征及页岩气保存模式认识不清的问题,选取焦石坝周缘砂岩样品及NW—SE向地质剖面,利用显微构造分析、平衡剖面技术,对焦石坝在地质历史时期应力方向、主要形变过程及形变时期进行研究。研究结果表明:焦石坝地区具有构造改造强度弱、改造时间晚、断层封堵性好、埋深适中以及良好的顶底板岩性组合的页岩气保存模式;在地质历史时期主要受NW—SE向的挤压应力影响,NE—SW向应力次之,主要形变期在120 Ma之后,地层总缩短量为3.8 km,缩短率为16.7%,其中65~85 Ma(燕山晚期)是焦石坝主要隆升阶段。该研究对四川盆地周缘页岩气勘探开发具有重要指导作用。
The sandstone core samples in the Jiaoshiba periphery and the NW-SE geologic cross-sections are taken to further characterize the structure and identify shale gas preservation pattern. Microstructure analysis and balanced cross-section are used to study the stress direction,major deformation process and deformation period of Jiaoshiba in the geologic history. Research indicates that the shale gas preservation pattern in Jiaoshiba is featured by weak tectonic reworking,late reworking time,better fault sealing,moderate buried depth and favorable top-bottom lithology combination. It is mainly affected by the compressive stress along the NW-SE direction in the geologic history period,followed by the NE-SW stress. The major deformation period is after 120 Ma,the total formation shortening is 3. 8 km with a shortening ratio of 16. 7%,where 65 ~ 85 Ma( Late Yanshan Period) is considered as the predominant uplifting stage of Jiaoshiba. This research could provide a significant guidance for the shale gas exploration and development in the periphery of Sichuan Basin.
The sandstone core samples in the Jiaoshiba periphery and the NW-SE geologic cross-sections are taken to further characterize the structure and identify shale gas preservation pattern. Microstructure analysis and balanced cross-section are used to study the stress direction,major deformation process and deformation period of Jiaoshiba in the geologic history. Research indicates that the shale gas preservation pattern in Jiaoshiba is featured by weak tectonic reworking,late reworking time,better fault sealing,moderate buried depth and favorable top-bottom lithology combination. It is mainly affected by the compressive stress along the NW-SE direction in the geologic history period,followed by the NE-SW stress. The major deformation period is after 120 Ma,the total formation shortening is 3. 8 km with a shortening ratio of 16. 7%,where 65 ~ 85 Ma( Late Yanshan Period) is considered as the predominant uplifting stage of Jiaoshiba. This research could provide a significant guidance for the shale gas exploration and development in the periphery of Sichuan Basin.
引文
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[5]邹才能,杨智,朱如凯,等.中国非常规油气勘探开发与理论技术进展[J].地质学报,2015,89(6):979-1007.
[6]杨平,印峰,余谦,等.四川盆地东南缘有机质演化异常与古地温场特征[J].天然气地球科学,2015,26(7):1299-1310.
[7]胡东风,张汉荣,倪楷,等.四川盆地东南缘海相页岩气保存条件及其主控因素[J].天然气工业,2014,34(6):17-23.
[8]郭彤楼,张汉荣.四川盆地焦石坝页岩气田形成与富集高产模式[J].石油勘探与开发,2014,41(1):28-36.
[9]郭旭升.涪陵页岩气田焦石坝区块富集机理与勘探技术[M].北京:科学出版社,2014:108-110.
[10]何永年,林传勇,史兰斌.构造岩石学基础[M].北京:地质出版社,1988:38-41.
[11]胡玲,刘俊来,纪沫,等.变形显微构造识别手册[M].北京:地质出版社,2009:52-55.
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