民和盆地上侏罗-下白垩统储层特征及影响因素

Upper Jurassic- Lower Cretaceous Reservoir Characteristics and Influence Factors in Minghe Basin

储层物性差是制约民和盆地油气勘探获得重大突破的关键。通过对上侏罗-下白垩统储层沉积相、砂体特征、岩石结构类型、物性特征及其影响因素的系统分析,认为盆地主要为低孔低渗或低孔特低渗储层,高地温场、成岩过程中的压实与胶结作用是造成盆地物性差的主要原因。古埋藏浅、次生孔隙发育、易形成裂缝的环凹陷周缘斜坡带及凹中继承性隆起带是有利的储层发育区。

Poor reservoir property is the main constrained factor for oil and gas exploration to obtain a significant breakthrough in Minghe basin. By systematically analyzing reservoir depositional facies, sand body characteristics, petrological characteristics, reservoir properties and the influence factors for the upper Jurassic-Lower Cretaceous, it was thought that the basin was dominated by reservoirs with low porosity and permeability, or low porosity and extra low permeability; the main reasons led to basin physical property poor are high geothermal field, compaction and cementation at the diagenetic stage. The slope zone around the depression, with shallow paleodepth and the favorable secondary pore and easily forming fracture, and the uplifted zone in the center of the depression are the favorable reservoir growth zones.