摘要
乐山—龙女寺加里东古隆起形成时间早 ,延续时间长 ,隆起幅度大 ,分布面积广 ,是下古生界储层聚集油气成藏的最有利场所。下寒武统筇竹寺组 ,是目前公认的一套优质有效的烃源岩。有机质丰度高 ,类型好 ,沉积厚度大 ,生烃强度大 ,能为形成大中型油气藏提供充足的烃源。洗象池群存在十分有利于储层发育的沉积相带。如 ,在潮坪相区和台内滩相区 ,有相对发育的颗粒白云岩。古岩溶比较发育 ,容易形成孔洞层。古隆起带核部和古斜坡带一直处于古构造演化的高部位 ,强烈的风化壳岩溶和埋藏岩溶作用 ,是下古生界储层聚集油气藏的最有利场所 。
The Leshan Longnusi Caledonian paleouplift, early formed, long lasted, large uplifted and wide distributed, is the most favourable site for forming lower Paleozoic oil and gas reservoir. The lower Cambrian Qiongzhusi Formation is a suite of currently acknowledged high quality and effective hydrocarbon source rock. The high abundance in organic matter, good in type, great thickness in sedimentation, and strong in hydrocarbon generation, all these can supply sufficient hydrocarbon sources for forming oil and gas pool of medium type to large type. There exist sedimentary facies zones in Xixiangchi Group, quite beneficial to reservoir growth, such as the grained dolostones relatively growing in tidalflat facies area and intraplatformal bank facies area. The more growing paleokarst is easy to form vuggy layers. The paleouplift core and paleoslope are continuously lying in high position during paleotectonic evolution, and where the residuum karstic and burying karstic action is intense is the most favourable site for oil and gas accumulating in lower Paleozoic reservoir. Emphasis should be put in area of paleouplift core and paleoslope for Middle and Upper Cambrian oil and gas exploration.
出处
《天然气勘探与开发》
2004年第4期1-2,17,共3页
Natural Gas Exploration and Development
