松辽盆地梨树断陷期储层流体包裹体特征及油气成藏期次  

Characteristics of reservoir fluid inclusions and oil and gas accumulation stages during the Lishu fault depression,Songliao Basin

作　　者：李永刚[1] Li Yonggang(Northeast Oil and Gas Branch of China Petroleum and Chemical Corporation,Changchun 130062,China)

机构地区：[1]中国石油化工股份有限公司东北油气分公司,吉林长春130062

出　　处：《能源与环保》2023年第10期135-144,共10页CHINA ENERGY AND ENVIRONMENTAL PROTECTION

基　　金：中国石油天然气集团有限公司—中国石油大学(北京)战略合作科技专项(ZLZX2020-01)。

摘　　要：松辽盆地断陷期油气成藏研究仍比较薄弱,制约了松辽盆地深部的油气勘探开发进展。以松辽盆地南部梨树断陷沙河子组致密砂岩储层为例,通过流体包裹体岩相学、微束荧光光谱、显微测温,结合盆地埋藏史模拟研究,厘定了断陷期油气成藏历史。结果显示,沙河子组储层中发现了近黄色和蓝白色荧光的2期石油包裹体,前者主要赋存在穿石英的微裂缝中,后者主要赋存在石英次生加大边中,反映了2种不同成熟度的石油充注过程。盆地模拟结果显示,梨树断陷沙河子组烃源岩成熟度由南向北降低,距今105~98 Ma开始生烃。利用与石油包裹体共生的盐水包裹体均一化温度结合热史模拟,确定研究区距今98~92 Ma和88~80 Ma两个时间段为油气的充注时间,储层油气充注时间晚于烃源岩生烃高峰。深化了松辽盆地断陷期的油气成藏过程认识,为油气勘探提供了重要依据。The research on oil and gas accumulation during the fault depression period in the Songliao Basin is still relatively weak,which restricts the progress of deep oil and gas exploration and development in the Songliao Basin.Taking the tight sandstone reservoir of the Shahezi Formation in the southern Lishu fault depression of the Songliao Basin as an example,the oil and gas accumulation history during the fault depression period was determined through fluid inclusion petrography,micro beam fluorescence spectroscopy,micro temperature measurement,and combined with basin burial history simulation research.The results show that near-yellow and blue-white fluorescence oil inclusions were found in the sandstone reservoir of the Shahezi Formation.The former is mainly formed in microfractures through quartz,and the latter is captured during quartz overgrowth,reflecting two periods of petroleum charge.Basin modelling results show that the maturity of the Shahezi source rocks of the Lishu fault depression decreased from south to north,with the begining of hydrocarbon generation during the period of 105~98 Ma B.P..By combining the homogenization temperature of saline inclusions coexisting with petroleum inclusions with thermal history simulation,it was determined that the two time periods from 98~92 Ma B.P.and 88~80 Ma B.P.in the study area were the filling time for oil and gas.The oil and gas filling time of the reservoir was later than the peak hydrocarbon generation of the source rock.Deepening the understanding of the oil and gas accumulation process during the fault depression period in the Songliao Basin provides an important basis for oil and gas exploration.

关 键 词：梨树断陷 沙河子组 油气成藏期次 流体包裹体 

分 类 号：P618.13[天文地球—矿床学]