【摘要】 川东地区侏罗系自流井组大安寨段具有“近源成藏”特征。通过烃源岩评价、流体包裹体分析、埋藏史恢复等方法，对川东地区侏罗系自流井组大安寨段储层特征与油气成藏进行了研究。研究结果表明：(1)川东地区侏罗系自流井组大安寨段泥页岩有机质类型主要为Ⅱ型，实测残余有机碳质量分数平均为0.67%，生烃潜量为1.53 mg/g，有机质热演化程度为1.1%～1.3%，总体上，大安寨段烃源岩有机质丰度中等偏下，处于生烃高峰期。(2)研究区大一亚段岩性以介壳灰岩和灰岩为主，构造缝为最主要的储集空间类型，其次为沿构造缝发育的溶孔（洞）、溶蚀微孔，储层物性较差，为特低孔特低渗储层。(3)研究区大安寨段油气藏存在2期原油充注和1期天然气充注，2期原油充注时间分别为距今约140 Ma和25 Ma，其中第一期为相对低成熟度的原油充注，第二期为相对高成熟度的原油充注，且后者为主要充注期，天然气充注时间与第二期原油充注时间一致，主要为原油伴生气。更多还原

【Abstract】 The Da’anzhai member of Jurassic Ziliujing Formation in eastern Sichuan Basin has the typical characteristics of near-source hydrocarbon accumulation. By means of source rock evaluation,fluid inclusion analysis and burial history recovery,the reservoir characteristics and hydrocarbon accumulation of Da’anzhai member of Jurassic Ziliujing Formation in eastern Sichuan were studied. The results show that:(1)The organic matters of Da’anzhai member of Jurassic Ziliujing Formation in eastern Sichuan Basin are mainly type Ⅱ. The measured residual organic carbon mass fraction is 0.67%,the hydrocarbon generation potential is 1.53 mg/g,and the thermal evolution degree of organic matter is 1.1%-1.3%. On the whole,the source rocks of Da’anzhai member have medium to low abundance of organic matters,which is at the peak of hydrocarbon generation.(2)The lithologies of the first submember of Da’anzhai member in the study area are mainly shell limestone and limestone,and the structural fractures are the main reservoir space,followed by dissolved pores(caves)and dissolved micropores developed along the structural fracture. The reservoirs have poor physical properties with ultra-low porosity and ultra-low permeability.(3)There are two stages of crude oil charging and one stage of natural gas charging in the reservoirs of Da’anzhai member in the study area. The two stages of crude oil charging time are about 140 Ma and 25 Ma respectively. The first stage is relatively low maturity crude oil charging,the second stage is relatively high maturity crude oil charging,and the latter is the main charging period. The natural gas charging time is the same as the second stage of crude oil charging,which is mainly associated gas of crude oil.更多还原