临清坳陷东部煤成气成藏条件及富集主控因素

Main Controlling Factors on Gas from Coal Reservoiring Condition and Enrichment in Eastern Part of Linqing Depression

煤成气是临清坳陷东部勘探的重要领域,但是由于勘探程度整体较低、成藏条件研究不够系统和深入,制约了研究区煤成气勘探的进一步发展。通过系统分析源岩、储层、盖层、圈闭等煤成气成藏条件,提出了临清坳陷东部煤成气三元控藏的新认识,即“二次生烃是根本、近源输导是基础、有效保存是关键”,三者的有机耦合控制了煤成气的富集成藏。建立了洼陷带、斜坡带、凸起带三类成藏模式,明确了临清坳陷东部煤成气今后的主要勘探方向,转变了以往主探凸起带的部署思路,下一步主要围绕有利二次生烃中心,在近源的斜坡带、洼陷带主探自生自储型和上古生下古储类型煤成气。

Gas from coal is a major exploration objective in the eastern part of Linqing depression.Yet,owing to low degree of exploration as a whole and not systematic and deep-going have restricted further development of gas from coal exploration in study area.Through systematic analysis of source rock,reservoir strata,overburden and trap etc reservoiring conditions has proposed a new understanding of ternary reservoiring controlling on gas from coal in the area,i.e.“the secondary generation of hydrocarbon is the root,provenance approaching conveyance the basis,effective accumulation the key”,the triad organic coupling has controlled enrichment and reservoiring of gas from coal.Thus three types of low-lying zone,slope zone and raised zone reservoiring models have been established;main exploration orientation of gas from coal in the area defined and previous thinking of mainly to explore raised zone deployment changed.The next deployment will mainly center on favorable secondary generation of hydrocarbon core,in provenance approaching slope zone,low-lying zone to explore“self-generation and self-accumulation”type and upper Paleozoic generation,lower Paleozoic reservoiring type gas from coal.