滨里海盆地Adaiski区块盐下成藏主控因素分析

Adaiski区块位于滨里海盆地东南部,构造上属于南恩巴坳陷区。滨里海盆地在早二叠世晚期发育巨厚盐岩,盐岩覆盖之下的的泥盆系-二叠系以碳酸盐岩和碎屑岩沉积为特征。经已钻井证实Adaiski区块盐下油气资源丰富。在对该区块盐下油气基本成藏条件分析的基础上,详细分析了盐下成藏的主控因素,指出盐下成藏的主控因素是碳酸盐岩台地和生物礁的发育和分布,其次孔谷阶盐岩盖层的分布对成藏有重要影响。

Main Factors Controlling Hydrocarbon Reserboirs in the Pre-Salt of the Block Adaiski in Precaspian Basin

Block Adaiski is locked southest of Pre-Caspian Basin and Nan’enba Depression in structure.Mega-thickness salt rock is developed in the stage of Early Permian in Pre-Caspian,which is a set of marine facies formations mainly composed of limestone and clastic rocks.Abundant of hydrocarbon resource is demonstrated in Adaiski by drilled wells.Based on analysis of the basic conditions for reservoir formation in the pre-salt in this Block,this paper researched into main factors controlling reservoirs in the pre-salt.Study indicated that main factors controlling reservoir are the development and distribution of Carboniferous carbonate platforms and biogenic reef.And the distribution of the salt of the Kungurian is another important factor controlling reservoir.