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以往研究认为川东北地区中浅层缺乏优质烃源岩,导致该层系天然气勘探一直处于停滞状态。通过大量露头、地震、录井及井下分析化验等资料,对川东北地区中浅层烃源岩、储集条件进行综合评价,并对圈闭、油气运移聚集、保存条件等成藏基本要素进行研究。研究结果表明:研究区中浅层具备良好烃源条件,发育多套致密砂岩、砾岩等多类型储层,源、储配置关系良好;岩性圈闭、构造圈闭及构造-岩性复合圈闭等多种类型圈闭共存,油气运移、聚集、保存条件优越;研究区处于继承性古隆起斜坡,有利于油气聚集成藏,具备形成大中型气田的基本条件,勘探潜力巨大。
Previous studies suggest that the lack of high-quality source rocks in the middle and shallow parts of northeastern Sichuan has led to the stagnation of natural gas exploration in this layer. Through a large amount of outcrops, earthquakes, mud logging and downhole analysis and other data, the comprehensive evaluation of middle-shallow source rocks and reservoir conditions in northeastern Sichuan was carried out, and the basic elements of hydrocarbon accumulation such as traps, hydrocarbon migration and accumulation, and preservation conditions research. The results show that there are good hydrocarbon source conditions in the middle and shallow layers of the study area, and multiple sets of tight sandstone, conglomerate and other types of reservoirs are developed, and the relationship between source and reservoir is good. The lithologic traps, structural traps and tectono-lithology composite Traps and other types of traps coexist, migration and accumulation of oil and gas, and favorable conditions for preservation. The study area is in the area of inherited paleo-uplift slopes that are favorable for the accumulation and accumulation of oil and gas and have the basic conditions for forming large and medium gas fields with great potential for exploration.