【摘要】 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。更多还原

【Abstract】 The exploration of marine-facies and terrestrial facies formations in Sichuan basin has made great breakthrough after years of thorough study,discovering some billion square large gas fields,facilitating the implement of project of " East Gas Transmission", and supporting the national energy strategy.Previous researchers believed that,due to the lack of high-quality hydrocarbon source rocks,the nature gas exploration is stagnant in middle-shallow formations of the northeastern Sichuan basin.The systemic studies are carried out on the hydrocarbon source condition,the reservoir condition,trap condition,the hydrocarbon migration and accumulation condition and the preservation condition in middle-shallow formations of the northeastern Sichuan basin in this paper.And,it is found that there are lots of high quality hydrocarbon source rocks,multiple sets of different types of reservoirs, and several kinds of traps in the middle-shallow formations of northeastern Sichuan basin,and is beneficial to hydrocarbon accumulate by superior migration,aggregation and preservation conditions.From the conditions of hydrocarbon accumulation,we can conclude that there is favorable exploration potential to form big-medium gas fields in middle-shallow formation of northeastern Sichuan basin.更多还原