曹妃甸2-1油田生屑云岩储层特征及主控因素

Geological characteristics and its main controlling factors of bioclastic dolostone reservoir in CFD2-1 Oilfield

曹妃甸2-1油田沙一段下部发育湖相碳酸盐岩储层,利用岩心观察、铸体薄片、扫描电镜等资料,分析沙一段下部储层岩性、物性及储集空间特征。结果表明,沙一段下部储层岩性主要为生屑云岩,粒间孔、粒间溶孔、生腔体腔孔、粒内溶孔是主要的储集空间类型,储层物性为中孔—中低渗。储层的发育和分布主要受沉积环境和古地貌的控制,沉积微相成果和古地貌恢复结果可以为预测有利相带提供依据。

Carbonate dolostone was widely developed in the bottom of the first member of Shahejie Formation in CFD2 - 10ilfield. Various data including core description, casting thin sections and SEM were used to systemically analyze the reservoir lithology, rock property and reservoir space types. The study indicated that the main reservoir lithology was bio- clastic dolostone;the reservoir spaces were dominated by intergranular pores,interparticle dissolution pores, skeletal pores and intragranular dissolved pores ; the reservoir had characteristics of medium porosity and low - medium permeability. The reservoir development and distribution were mainly controlled by sedimentary environment and paleogeomorphy, and the comprehensive study results in carbonate sedimentary model and paleogeomorphy restoration can be used to predict the good reservoir distribution effectively.