贵州北部岩孔剖面灯影组白云岩储层特征及成岩作用OA

The Dengying Formation in the Yankong profile of the northern Guizhou Province has an old stratigraphic age,great burial depth,and complex diagenetic evolution.In order to effectively support the next exploration progress in this area,the fine characteriza-tion and diagenesis of the reservoir are studied in-depth by means of various methods such as rock thin section microscopic identifica-tion,scanning electron microscopy,porosity and permeability testing,cathodoluminescence,fluid inclusions,and geochemical analysis.The research results indicate that the reservoir lithology is mainly algal dolomite,sandstone debris dolomite,and grape lace-shaped dolo-mite;The storage space mainly consists of intercrystalline dissolution pores,intracrystalline dissolution pores,intragranular dissolution pores,moldic pores,and cracks,with overall physical properties of medium-low porosity and low permeability;Algal dolomite and grape lace-shaped dolomite are easy to maintain good primary structure,and recrystallization during burial can promote the development of in-tercrystalline pores in dolomite;The syngenetic dissolution,burial dissolution,and epigenetic dissolution further transform the reservoir and expand the storage space;The development of various types of fractures significantly improves the permeability of the reservoir and enhances the overall storage performance of the reservoir.This research achievement can provide important theoretical basis and techni-cal support for the evaluation of the Dengying Formation reservoir in the northern part of Guizhou Province,the prediction of favorable exploration areas,and the next exploration deployment.