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合水地区长4+5是一套在内陆湖泊三角洲沉积体系上发育的重要油气储集层,对储层岩石学特征、孔渗特征进行分析,结果表明:研究区长4+5储层物源主要来自西南部,沉积相主要以三角洲前缘亚相为主,岩石类型以岩屑质长石砂岩为主、少量长石岩屑石英砂岩,孔喉组合类型为中-细孔-细喉型;孔渗特征受沉积相控制较明显,其高值区基本沿水下分流河道砂体方向展布。影响油气聚集程度的主控因素依次为沉积相、砂体分布、储层特征及构造。
Chang 4 + 5 in Heishui area is a set of important oil and gas reservoirs developed in the sedimentary system of inland lakes and deltas. The petrological characteristics and porosity and permeability characteristics of the reservoirs are analyzed. The results show that the 4 + 5 reservoirs The source rocks are mainly from the southwestern part of the Yangtze River. The sedimentary facies is dominated by the delta front. The rock types are mainly lithic feldspathic sandstones and a small amount of feldspathic quartz sandstones. The types of pore throats are mesoporosity-fine pores The pore-permeability characteristics are controlled by sedimentary facies obviously, and the high value zones are basically distributed along the distributary channel sand body. The main controlling factors affecting the degree of hydrocarbon accumulation are sedimentary facies, sand body distribution, reservoir characteristics and structure.