天然气地球科学 ›› 2020, Vol. 31 ›› Issue (9): 12041215.doi: 10.11764/j.issn.1672-1926.2020.05.015
吴小奇1,2(),陈迎宾1,2,翟常博2,周小进1,2,刘文汇3,杨俊1,2,宋晓波4
Xiao-qi WU1,2(),Ying-bin CHEN1,2,Chang-bo ZHAI2,Xiao-jin ZHOU1,2,Wen-hui LIU3,Jun YANG1,2,Xiao-bo SONG4
摘要:
四川盆地中三叠统雷口坡组天然气勘探近年来取得重要突破后继而成为业内关注的热点,但对气源的认识存在较大的分歧。基于天然气地球化学特征开展的成因鉴别和气源对比研究表明,雷口坡组天然气既有主要来自下伏上二叠统龙潭组/吴家坪组烃源岩(磨溪雷一段气藏),断裂下盘须一段烃源岩有一定贡献(中坝雷三段气藏)或供烃条件(川西雷四段气藏),也有主要来自须家河组烃源岩,雷口坡组自身烃源岩有一定贡献(元坝和龙岗雷四段气藏)。雷口坡组气藏具有3种不同的源储组合,其天然气勘探方向具有差异。上二叠统龙潭组烃源岩作为主力烃源岩构成下生上储型,切穿龙潭组至雷口坡组的深断裂周缘的正向构造是寻找雷口坡组规模性气藏的最有利区。上三叠统须家河组底部烃源岩和雷口坡组顶部储层可以构成旁生侧储型,岩溶残丘或岩溶斜坡局部构造高点是这类组合较有利的发育部位。雷口坡组自身构成自生自储型,这类组合往往作为辅助参与气藏形成。
中图分类号:
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