岩性油气藏 ›› 2023, Vol. 35 ›› Issue (5): 139152.doi: 10.12108/yxyqc.20230514
郭谨豪1,2, 胡国艺1,2, 何坤1,2, 米敬奎1,2, 田连杰1,2, 贺飞1,2, 郭楚媛3, 卢梦蝶3
GUO Jinhao1,2, HU Guoyi1,2, HE Kun1,2, MI Jingkui1,2, TIAN Lianjie1,2, HE Fei1,2, GUO Chuyuan3, LU Mengdie3
摘要: 通过对川北地区上二叠统大隆组3条野外剖面进行系统采样和地球化学特征分析,从沉积背景、热液活动与上升流、古气候和古盐度、水体环境等4个方面分析了烃源岩的沉积环境,并对有机质富集模式和勘探潜力进行了探讨。研究结果表明: ①川北地区二叠系大隆组烃源岩岩性主要为泥质、硅质泥灰岩,有效厚度为10~40 m,有机质丰度高、类型好,TOC平均值为4.58%,以Ⅱ2型为主,生烃潜力大,平均热解生烃潜量为5.90 mg/g。盆地边缘广元地区长江沟剖面和西北乡剖面处于成熟阶段,Ro值分别为0.72%和1.06%,盆地东部大两乡剖面平均Tmax值为604℃,达过成熟阶段,广元—梁平海槽大隆组生气量达432.38×1012 m3,常规天然气资源量为1.70×1012 m3,页岩气资源量达万亿方级,是一套生气潜力较大的海相优质烃源岩。②研究区大隆组优质烃源岩形成于水体缺氧半局限循环的大陆边缘环境,经历了海槽发育雏形期和海槽发育扩展期2期水体环境的演变,其中,雏形期呈现缺氧—局部厌氧—缺氧的非硫化夹硫化环境,有机质不发育;扩展期为贫氧—缺氧—主体厌氧—缺氧环境,热液活动与上升流导致生物繁盛,火山喷发的酸性气体与半封闭水体环境共同造就了长时期大范围的厌氧硫化静海环境,有利于有机质的富集与保存,在西北乡和长江沟等斜坡—陆棚区表现出较高的TOC值,弱滞留硫化环境中TOC值最大,中等滞留硫化环境次之,强滞留硫化环境中TOC值最小。③研究区大隆组页岩气和源于大隆组热解气的长兴组—飞仙关组优质气藏为主要勘探方向。
中图分类号:
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