川西龙门山前构造带彭州雷口坡组大型气田的形成条件  

Forming conditions of Pengzhou large gas fi eld of Leikoupo Formation in Longmenshan piedmont tectonic belt, western Sichuan Basin

作　　者：李书兵[1] 许国明[1] 宋晓波[1] 

机构地区：[1]中国石化西南油气分公司

出　　处：《中国石油勘探》2016年第3期74-82,共9页China Petroleum Exploration

基　　金：中国石化重点科技项目"川西地区雷口坡组天然气富集规律研究"(P15101)

摘　　要：从2006年开始,经过8年的努力,实现了川西龙门山前构造带彭州雷口坡组天然气勘探重大发现,揭示了一个新的海相大气田——彭州气田。研究认为,彭州雷口坡组气藏特征表现为:具有大型正向隆起的构造背景,发育一套厚度大、分布广、纵向连续性较好、物性优、含气性好、产能高的白云岩溶蚀孔隙型储层,为常温常压、高含硫的酸性气田。总结出彭州雷口坡组大型气田的形成具备3个重要条件:一是多源供烃提供了丰富的物质基础,二是雷四段发育大规模白云岩孔隙型储层提供了充足的储集空间,三是大型正向隆起带提供了规模聚集场所。同时指出,龙门山前构造带雷口坡组气藏充满度高,勘探潜力大。Through efforts in eight years since 2006, a great gas exploration discovery was made in the Pengzhou Leikoupo Formation of the Longmenshan piedmont tectonic belt, western Sichuan Basin, which contributed a new large marine gas field - Pengzhou gas field. Study indicates that the Pengzhou Leikoupo Formation reservoir presents as there is a dissolution-pore type dolomite reservoir under a structural setting of large positive uplift belt, with features of a big thickness, a wide distribution, better lateral continuities, good physical properties, high gas-beating potentials, and high productivities. The reservoir is suggested as a sour gas field with normal temperature, normal pressure and high sulfur content. It is concluded that the Pengzhou large gas field of Leikoupo Formation was formed under three major conditions. First, multiple source rocks supplied abundant hydrocarbons, providing a good material basis. Second, large-scale dolomite pore type reservoir existed in the 4^th member of the Leikoupo Formation, providing sufficient storage spaces. Third, large positive uplift belt provided enough spaces for hydrocarbon accumulation. Meanwhile, it is pointed out that the Leikoupo Formation gas reservoir in the Longmenshan piedmont tectonic belt features high filling degree and great exploration potential.

关 键 词：川西 龙门山前构造带 雷口坡组 大气田 形成条件 

分 类 号：TE112[石油与天然气工程—油气勘探]