埕南断裂带913区块沙河街组三段砂砾岩体成藏条件分析

埕南断裂带埕 913区块是济阳坳陷埕南断裂带目前已发现的沙河街组三段砂砾岩体中唯一含油气区块。生、储、盖、圈闭条件的分析结果表明 ,虽然古隆起构造背景为其提供了油气汇聚指向、相对的浅埋藏所对应的良好储集性能、发育多种圈闭等成藏必要或有利条件 ,但有别于其他区块的特殊条件是该砂砾岩体之上发育有泥岩盖层或内部发育泥岩隔层。断层面封堵与否是成藏最关键的因素 ,断层面封堵的基本条件是要求砂砾岩体之上有泥岩盖层或隔层 ,具泥岩盖层或隔层的砂砾岩体与断鼻、断块圈闭匹配方可形成构造 -岩性油气藏。

ANALYSIS OF PETROLIFEROUS CONDITIONS FOR SAND-CONGLOMERATE BODIES IN MEMBER 3 OF SHAHEJIE FORMATION IN THE AREA OF C913, SHENGLI OIL FIELD, CHINA

The area of C913 is the only oil containing zone in the sand conglomerate bodies on the Chengnan fault slope. The study of petroliferous conditions about C913 is helpful to oil exploitation of this area and exploration of other areas in the depression. The background of paleouplift provides C913 area with predominant petroliferous conditions, such as oil accumulation, good reservoir corresponding to shallow depths, developing multi kinds of traps. However, the most important condition, which is special and different from other areas, is the mud (oil mud) capping over or confining bed inside the sand conglomerate bodies. The fault plane sealing is the pivotal factor. Only the traps with mud and oil mud capping over or confining bed inside the sand conglomerate bodies can be developed as oil pools.