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作者对环县地区长8油层组进行了详细的物源、沉积微相、砂体展布、物性、储层评价及今构造分析,在此基础上,研究了长8油层组的油气圈闭类型及油气富集规律,认为油气圈闭类型主要为岩性圈闭和构造—岩性圈闭,水下分流河道为油气富集的有利相带。油气富集程度具体受砂厚、孔隙度、渗透率等参数的控制,根据砂厚、孔隙度、渗透率等参数,参考已有的试油数据,将长8油层组的有利区块分为3类,进而对长8油层组优选出3个一类有利区块、2个二类有利区块和2个三类有利区块。
Based on the detailed analysis of provenance, sedimentary microfacies, sand body distribution, physical property, reservoir evaluation and structural analysis of Chang 8 reservoir in Huanxian area, the authors studied the hydrocarbon trap of Chang 8 reservoir Type and hydrocarbon accumulation law, it is considered that the main types of oil and gas traps are lithologic traps and tectonic-lithologic traps, and the submarine distributary channels are favorable facies belts for hydrocarbon enrichment. According to the sand thickness, porosity, permeability and other parameters, referring to the existing test oil data, the favorable areas of the Chang 8 reservoir group are divided into 3, and then for the Chang 8 reservoir group preferred three kinds of a favorable block, two two kinds of favorable blocks and two three kinds of favorable blocks.