四川长宁地区龙马溪组-五峰组页岩有机质热演化史  

Recovery of thermal evolution history of organic matter of Longmaxi and Wufeng Formations in Changning area,Sichuan Province,China

作　　者：张家浩 聂舟 井翠 陈义才[2] 康宇 彭文秋 ZHANG Jiahao;NIE Zhou;JING Cui;CHEN Yicai;KANG Yu;PENG Wenqiu(Sichuan Changning Natural Gas Development Co.,Ltd.,Chengdu 610000,China;State Key Laboratory of Oil&Gas Reservoir Geology and Exploitation,Chengdu University of Technology,Chengdu 610059,China)

机构地区：[1]四川长宁天然气开发有限责任公司,成都610000 [2]油气藏地质及开发工程国家重点实验室(成都理工大学),成都610059

出　　处：《成都理工大学学报（自然科学版）》2021年第3期347-353,共7页Journal of Chengdu University of Technology: Science & Technology Edition

基　　金：国家科技重大专项(2016ZX05062006)。

摘　　要：研究四川盆地长宁地区龙马溪组第一段下亚段-五峰组主力产气层的有机质演化历史。在15口钻井岩心薄片的沥青反射率测定和地层厚度趋势法估算喜马拉雅期的地层剥蚀厚度基础上,应用盆地模拟软件对20口完钻评价井和24口人工虚拟井的埋藏史和有机质的热演化史进行模拟计算,结果显示:(1)页岩的沥青反射率在2.15%~4.57%,平均等效镜质体反射率为2.41%;(2)页岩有机质在中二叠世-早三叠世达到生油高峰,中三叠世-早白垩世处于大量生气期;(3)古近纪以来,受喜马拉雅构造抬升与地层剥蚀作用影响,地层温度大幅度降低,页岩有机质生烃作用趋于停止。长宁地区龙马溪组第一段下亚段-五峰组页岩生气高峰较早,保存条件对页岩气富集具有重要影响。The organic matter evolution history of the main gas producing layer of Wufeng Formation and the lower sub-member of the first member of Longmaxi Formation in Changning area,Sichuan Basin is studied through the measurement of bitumen reflectance of 15 drilling cores,estimation of the strata denudation thickness by thickness trend method in the Himalayan period,and through the basin simulation on the burial history and the thermal evolution history of organic matter in 20 evaluation wells and 24 artificial virtual wells.The results show that the asphalt reflectance of shale ranges from 2.15%to 4.57%,and the average equivalent vitrinite reflectance is 2.41%.The organic matter of shale reached the peak of oil generation in the middle Permian-early Triassic,and it was in the period of abundant gas generation in the middle Triassic and early Cretaceous.Since Paleogene,due to the influence of Himalayan tectonic uplift and stratigraphic denudation,the formation temperature has decreased greatly,and the hydrocarbon generation of shale organic matter tends to stop.The shale gas generation peak of Wufeng Formation and the first sub-member of Longmaxi Formation in Changning area is earlier.It is proposed that the preservation conditions have an important effect on the enrichment of shale gas.

关 键 词：五峰组 龙马溪组 埋藏史 热演化史 生烃史 长宁地区 

分 类 号：TE122.113[石油与天然气工程—油气勘探]