长岭断陷火山岩储层流体包裹体分布特征及天然气成藏期次  

Distribution of fluid inclusions and the timing of gas accumulation in the volcanic reservoirs in Changling faulted depression,Songliao Basin

作　　者：吴聿元[1,2,3] 秦黎明[4] 刘池阳[2] 冯如进[2,3] 昝灵[4] 张枝焕[4] 

机构地区：[1]中国科学院地质与地球物理研究所 [2]西北大学地质系 [3]中国石化华东分公司 [4]"油气资源与探测"国家重点实验室.中国石油大学(北京)

出　　处：《天然气工业》2010年第2期26-31,共6页Natural Gas Industry

摘　　要：长岭断陷火山岩储集层成藏条件十分优越,勘探前景广阔。对该区腰英台凸起区深层火山岩系39块流体包裹体进行了偏光、荧光特征观察、均一化温度及冷冻温度(盐度)等测定,分析了储层流体包裹体类型及分布特征,充分利用包裹体均一化温度信息,结合烃源岩生烃史以及地层埋藏史,分析了该区天然气的成藏期次。该区火山岩储层烃类包裹体极为发育,以气态烃包裹体为主,包裹体中存在较多的CO2,其中达尔罕构造营城组包裹体中CO2含量较高。腰英台构造带为1期成藏,成藏时间为距今84～93Ma,油气充注期为青山口组沉积中后期至嫩江组时期;达尔罕构造带油气充注时间为距今87～94Ma,CO2充注时间为距今81～85Ma,相当于嫩江组的后期至四方台组早期,新近纪之后构造运动产生的CO2为大规模的无机CO2的来源。该区油气成藏期次与营城组与沙河子组烃源岩的生排烃史较为匹配。The volcanic reservoirs in Changling faulted depression of the Songliao Basin are high in exploration potentials thanks to their favorable hydrocarbon pooling conditions.We made an observation of the polarized light and fluorescence features and measurement of homogenization temperature and freezing temperature of 39 fluid inclusions sampled from the deep volcanic rock formation of the Laoyingtai salient in the study area,and analyzed the types of fluid inclusions and their distribution characteristics.The timing of the gas accumulation in the study area was determined according to the homogenization temperatures together with the hydrocarbon generation history and burial history of the strata.Hydrocarbon inclusions are well-developed in the volcanic reservoirs in the study area and are dominated by gaseous hydrocarbon inclusions.The content of CO2 is relatively high in the inclusions,especially the inclusions sampled from the Yingchen Formation in the Da'erhan structure.In the Yaoyingtai structural zone,there was only one stage of gas charging which occurred at 93-84 Ma ago,corresponding to the middle-late Qingshankou to Nenjiang.While in the Da'erhan structural zone,gas charging occurred at 94-87 Ma ago and CO2 charging occurred at 85-81 Ma ago,corresponding to the late Nenjiang to the early Sifangtai.The post-Neogene tectonic movement contributed a large amount of inorganic CO2 to the gas pools.The timing of gas accumulation in the study area correlates well with the hydrocarbon generation history of the source rocks in the Shahezi Formation.

关 键 词：松辽盆地 长岭断陷 火山岩 储集层 流体包裹体 均一化温度 成藏期次 生烃史 

分 类 号：P618.13[天文地球—矿床学]