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分析了储层岩石学特征、储集空间类型、储层孔渗特征及孔隙度与白云岩含量的关系,认为研究区飞三段储层主要岩类为鲕粒灰岩与鲕粒白云岩,主要的储集空间类型为粒间溶孔、粒内溶孔、晶间孔、晶间溶孔,鲕粒白云岩储层为区内最优储层。将飞三段划分为3个四级层序,认为鲕滩主要发育于每个四级层序的高位体系域中,纵向上发育3期鲕滩,具有由南西向北东抬升迁移的规律性;古地理位置的不同造成鲕滩储层储渗能力的差异,第1、2期鲕滩发育于缓坡部位,为鲕粒灰岩储层;第3期鲕滩发育于陡坡部位,发育优质鲕粒白云岩储层;认为白云岩与滩体暴露有关,为混合水成因,分布于建南北高点及东北方向,由南西-北东呈间断叠瓦状排列分布,并具有逐渐增厚的趋势。针对鄂西渝东区储层分布规律,提出建南构造南高点及西南方向的区域,以滚动扩边,打斜井提高单井产能为主;建南构造北高点及东北方向的区域,应以寻找优质白云岩储层为主。
The relationship between reservoir petrology characteristics, reservoir space type, reservoir porosity and permeability and dolomite content is analyzed. It is considered that the main rocks of Feishang Formation in the study area are oolitic limestone and oolite dolomite, The main types of reservoir space are intergranular dissolved pores, intragranular dissolved pores, intercrystalline pores, intergranular dissolved pores and oolite dolomite reservoirs are the best reservoir in the area. Dividing the three sections into three fourth-order sequences, it is considered that the oolitic beach mainly develops in the highstand system tract of each fourth-order sequence and three oolitic beaches are longitudinally developed, with the regularity of uplifting and migration from southwest to northeast ; The paleogeographical location caused the differences in the ability of reservoirs to store and ooze in the oolitic beach reservoirs. The first and second oolitic beaches developed in the gentle slope and became oolitic limestone reservoirs. The third oolitic beach developed on steep slopes and developed high-quality oolitic Dolomite reservoir. It is considered that the dolomite is related to the exposure of the beach body and is the cause of mixed water. It is distributed in the northern and southern high points and the northeast, and distributed in a discontinuous, shingled form from the southwest to the north east and has the trend of gradually thickening . According to the reservoir distribution regularities in western Hubei and eastern Chongqing, we proposed that the southern high point and the southwest direction of Jiannan structure should be established, and the single well productivity should be increased mainly by rolling edge spreading and beveling. North Jiannan structure will be formed in the northeast, Should be looking for high-quality dolomite reservoir-based.