渤海L油田东营组储层特征与成岩作用分析

Reservoir characteristics and diagenesis of Dongying Formation in L oilfield,Bohai Bay

研究渤海L油田东营组储层特征和储层物性的控制因素是该油田后期高效开发的前提。根据岩心观察,结合薄片鉴定、扫描电镜、阴极发光和物性等资料,以储层地质学理论为指导,对研究区储层特征、成岩作用及孔隙演化进行了深入分析。认为L油田东营组储层砂岩具有矿物成熟度与结构成熟度均较低的特征,成岩作用类型主要有压实与压溶作用、胶结作用、交代作用、溶解作用4种,大致经历了早成岩A期、早成岩B期、晚成岩A期3个阶段,目前已达晚成岩B期。成岩作用是控制研究区储层物性的一个关键因素,在孔隙演化过程中,压实与压溶作用、胶结作用起破坏性成岩作用,溶解作用起建设性成岩作用。

To ascertain the reservoir characteristics and the physical properties controlling factors of Dongying Formation is the premise of the efficient development in L oilfield in Bohai Bay.Based on core observation,combined with thin section observation,scanning electron microscope,cathodeluminescence and physical property analysis,this paper studied and analyzed the reservoir characteristics,diagenesis and pore evolution under the guidance of reservoir geology theories.The result shows that the sandstone of Dongying Formation in L oilfield has the characteristics of low mineral maturity and textural maturity.The main diageneses are compaction,cementation,metasomasis and dissolution.The diagenesis roughly experienced early diagenetic A and B stage and late diagenetic A stage,and now it is in the late diagenetic B stage.The diagenesis has great effects on controlling the physical properties in the study area.During the pore evolution,the compaction and the cementation are destructive,while the dissolution is constructive.