延吉盆地成藏期与油气分布  

PETROLEUM ACCUMULATION PERIOD AND DISTRIBUTION IN YANJI BASIN

作　　者：张吉光[1] 卢滨[2] 孟元林[3] 金银姬[4] 刘艳杰[4] 

机构地区：[1]大庆油田有限责任公司勘探事业部,黑龙江大庆163453 [2]大庆油田有限责任公司勘探开发研究院,黑龙江大庆163712 [3]东北石油大学地球科学学院,黑龙江大庆163318 [4]大庆油田有限责任公司钻探工程公司物探一公司,黑龙江大庆163357

出　　处：《大庆石油地质与开发》2015年第3期23-28,共6页Petroleum Geology & Oilfield Development in Daqing

基　　金：全国油气资源战略选区调查与评价国家专题项目(2009GXYQ12-05)

摘　　要：延吉盆地沉积地层较厚,发育优质的烃源岩,发生过成烃、成藏过程,在砂岩成岩矿物中可识别液态包裹体（盐水包裹体）、气液包裹体（气、液两相）、气态包裹体等类型.流体有机包裹体分为2期：第Ⅰ期流体包裹体盐度平均为2.79％,表明铜佛寺组和大砬子组为淡水湖盆的沉积环境,均一温度为80.3℃;第Ⅱ期包裹体盐度平均为3.97％（属于高盐度流体）,说明受大气淡水的影响较小,具有相对较好的保存条件,均一温度为108.17℃.包裹体中的烃类气体成分主要是甲烷.大砬子组二段、龙井期为主成藏期,对应的地质年代分别距今98～101Ma和60 ～ 43 Ma.油气运移和成藏一直延续到古近纪,南北两侧靠近烃源岩区形成油质较重的油藏且上叠气藏.Yanji Basin is characterized by thick sedimentary strata and well-developed high-quality hydrocarbon source rocks and processes of the hydrocarbon generation and accumulation occurred.The paper liquid inclusions （brine inclusions）,gas-liquid inclusions （gas and liquid phases）,gaseous inclusions can be from distinguished from the sandstone diagenetic minerals.The organic fluid inclusions are divided into two stages：the average salinity of the first-stage fluid inclusions is 2.79％,this parameter shows that the depositional environments of Tongfesi and Dalazi Formations belong to the ones of the freshwater lake basin,the homogeneous temperature of 80.3 ℃;the corresponding same parameter in the second period is 3.97 ％ （belongs to high salinity）,which indicates that the fluids are less influenced by the atmospheric freshwater and possess relatively better preserved conditions,the homogeneous temperature is 108.17 ℃.The composition of the main hydrocarbon gas in the inclusions is Methane.The time of Member 2 of Dalazi Formation and Longjing-stage are the principal periods of the hydrocarbon accumulation,the corresponding geologic ages are respectively 98.0-101.0 Ma and 60.0-43.0 M before the present.The oil and gas migration and accumulation had continued into Paleogene Period.The accumulated heavier oil reservoirs overstacked by the gas accumulations are enriched in the south and north of the basin and the area close to the hydrocarbon source rock districts.

关 键 词：延吉盆地 流体包裹体 均一温度 成藏期 油气分布 

分 类 号：TE358[石油与天然气工程—油气田开发工程]