天然气地球科学 ›› 2022, Vol. 33 ›› Issue (5): 789798.doi: 10.11764/j.issn.1672-1926.2022.01.011
陈丽清1(),伍秋姿1,范存辉2(),钟可塑1,杨雪1,何亮1
Liqing CHEN1(),Qiuzi WU1,Cunhui FAN2(),Kesu ZHONG1,Xue YANG1,Liang HE1
摘要:
四川盆地南部双龙—罗场地区龙马溪组是深层页岩气勘探开发的重点区域,构造裂缝的发育特征及形成期次对页岩含气性及产能具有重要影响。综合运用岩心、FMI成像测井、裂缝充填物流体包裹体测试、岩石声发射实验及埋藏—热演化史分析等,对页岩构造裂缝的发育特征及形成时期开展综合研究。结果表明:龙马溪组构造裂缝主要以构造成因的高角度缝、直立缝和复合缝为主,岩心裂缝具有间距大、密度小、倾角大、充填程度高等特征;成像测井裂缝倾角与岩心具有较好的一致性,延伸方位以近EW向、NNE向和NWW向为主,次为NNW向。岩心裂缝切割关系、成像测井裂缝产状匹配关系、裂缝充填物流体包裹体测试以及岩石声发射实验均证实,双龙—罗场地区龙马溪组构造裂缝经历了3期以上的构造运动改造。结合埋藏—热演化史分析,厘定了构造裂缝的形成时期为燕山运动中晚期—喜马拉雅运动早期(78~56 Ma)、喜马拉雅运动中期(56~29 Ma)、喜马拉雅运动晚期—现今(29 Ma至今),对应的裂缝充填物流体包裹体均一温度分别为165~198 ℃、115~146 ℃、74~105 ℃。基于构造地质学原理,建立了双龙—罗场地区龙马溪组构造裂缝的成因机制。
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