莺歌海盆地乐东地区石英裂隙内流体包裹体特征及其对天然气成藏制约  

Characteristics of fluid inclusions in quartz fractures in Ledong area of Yinggehai Basin and its constraints on gas accumulation

作　　者：税蕾蕾 梁茹 孟祥豪[3] 郭来源 许克伟 Shui leilei;Liang ru;Meng Xianghao;Guo Laiyuan;Xu Kewei(CNOOC Experiment Center(Zhanjiang),Engineering Technology Branch of CNOOC Energy Development Co.,Ltd.Zhanjiang 524057,China;Engineering Technology Branch of CNOOC Energy Development Co.,Ltd.Tianjin,300452,China;State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation(CDUT),chengdu,610059)

机构地区：[1]中海油能源发展股份有限工程技术分公司,天津300452 [2]广东省海上高温高压油气藏勘探开发企业重点实验室,湛江524057 [3]油气藏地质及开发工程国家重点实验室(成都理工大学),四川成都610059

出　　处：《沉积与特提斯地质》2020年第1期45-52,共8页Sedimentary Geology and Tethyan Geology

基　　金：中海油能源发展股份有限公司科技项目莺琼盆地天然气轻烃与流体包裹体实验新方法建立及应用研究(HFKJ-GJ2018-11)。

摘　　要：莺歌海盆地乐东地区是我国典型高温超压天然气勘探领域,其关键储层黄流组砂岩以天然气富含CO2为特征,对其中石英颗粒内裂隙包裹体的研究能为CO2来源和天然气成藏信息提供重要线索。本文通过对黄流组砂岩石英颗粒内包裹体进行岩相学、显微测温与激光拉曼分析,结果表明黄流组砂岩石英颗粒内正常捕获流体包裹体均一温度主要分布在155~165℃与170~180℃两个温度区间,流体包裹体成分为CO2(气)和H2O(液)两种或CO2(气)和CO2(液)、H2O(液)三种。这些特征表明乐东地区黄流组至少经历两期富含CO2的热液活动,记录了埋藏晚期无机CO2在火山活动或深大断裂发育期充注成藏的信息。Ledong area in Yinggehai basin is a typical field of high temperature and overpressure gas exploration in China.A large number of fluid inclusions are trapped in the quartz grains of sandstones in Huangliu Formation.Studying its characteristics and composition can analyze the information of gas accumulation in this area.According to the petrography,micro temperature measurement and laser Raman analysis of fluid inclusions,there are two types of fluid inclusions in the Huangliu formation quartz grain fracture:homogeneous and heterogeneous capture.The normally trapped fluid inclusions are mainly distributed between 155-165℃and 170-180℃,and the compositions of fluid inclusions are CO2(gas)and H2 O(liquid)or CO2(gas)and CO2(liquid)and H2O(liquid).The characteristics of fluid inclusions indicate that the Huangliu formation in Ledong area experienced at least two periods of CO2 rich hydrothermal activity,recording the information of inorganic CO2 filling and reservoir formation in the late burial stage during volcanic activity or deep fault development.

关 键 词：流体包裹体 石英裂隙 天然气成藏 莺歌海盆地 

分 类 号：TE133[石油与天然气工程—油气勘探]