岩性油气藏 ›› 2023, Vol. 35 ›› Issue (1): 108119.doi: 10.12108/yxyqc.20230110
谢瑞1,2, 张尚锋1,2, 周林3, 刘皓天3, 姚明君3, 蒋雪桂1,2
XIE Rui1,2, ZHANG Shangfeng1,2, ZHOU Lin3, LIU Haotian3, YAO Mingjun3, JIANG Xuegui1,2
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1.53mg/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140Ma和25Ma,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。
中图分类号:
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