松辽盆地南部扶余油层致密储层成岩序列及成藏期次

松辽盆地南部扶余油层致密油勘探已获得重大突破，但关于致密油的充注特征和成藏期次目前依然没有清楚认识。基于薄片的镜下观察和流体包裹体赋存特征，分析了不同次生矿物生长的先后顺序，建立了不同类型成岩作用以及油气充注在时间上的序列，同时依据流体包裹体均一温度，结合研究区地史、热史，分析不同区块的油气成藏期。研究表明，扶余油层致密储层主要发育压实、胶结、交代、溶蚀等成岩作用，压实作用贯穿于整个成岩作用的始末。油气在早期方解石胶结后和石英次生加大前开始充注，在石英次生加大期和长石溶蚀期间大规模充注，在晚期方解石胶结期油气充注进入尾期。液态烃在长岭凹陷区从嫩江组沉积时期至明水组沉积时期持续充注，扶新隆起区在嫩江组沉积初期充注。气态烃在隆起区为两期充注，分别为嫩江组沉积初期和四方台子—依安组沉积时期。

Diagenetic sequence and hydrocarbon accumulation phases of the Fuyu layer tight reservoir in the southern Songliao Basin

The tight oil exploration of the Fuyu layer has achieved a significant breakthrough in southern Songliao Basin,but the tight oil charging characteristics and accumulation history are still unclear.Based on thin section observation and fluid inclusions occurrence characteristics,the growth sequence of various secondary mineral was analyzed.The time sequence of different diagenesis stages and hydrocarbon charging phases were established.According to the homogenization temperature of fluid inclusions in combination with geologic history and thermal history in the study area,the hydrocarbon accumulation phases were established in different blocks.The results show that the minerals mainly experienced compaction,cementation,metasomatism,dissolution processes in the Fuyu layer tight reservoir and the compaction runs through the whole diagenesis history.Hydrocarbon began to charge after the early calcite cementation and before the quartz overgrowth.And a large scale of hydrocarbon charging happened during the period of quartz overgrowth and feldspar dissolution.In the period of late calcite cementation,hydrocarbon charging entered the later stage.Liquid hydrocarbon continued to charge during the deposition of the Nenjiang Formation and Mingshui Formation in Changling Sag,while in Fuxin Uplift charging happened in the early period deposition of the Nenjiang Formation.There were two periods of gaseous hydrocarbon charging in uplifted area:the time of early Nenjiang Formation deposition and of Sifangtaizi-Yian Formations,respectively.