论文部分内容阅读
A井区位于鄂尔多斯盆地西部,是长庆油田的重要油气产区之一,马家沟组是该井区的主力油气储层,属低孔、低渗储层。论文通过常规物性实验、压汞实验和铸体薄片观察测定实验对所取的260余块岩心样品进行检测分析,得到了A井区马五段的孔渗值、孔隙特征和储层矿物成分以及孔隙类型情况。研究表明:马五段储层孔隙度平均值为3.78%,78.3%样品的渗透率小于0.5 m D,测得所选样品平均孔喉半径值为5.17μm,而且分选性差。马五段储层为碳酸盐岩,所含矿物类型有白云石、方解石、泥质、硅质、伊利石和黄铁矿等,镜下观察到的孔隙类型有溶缝、溶孔、溶洞、膏模孔及构造裂隙,常伴随不同矿物的结晶充填。
Well A is located in the western part of Ordos Basin and is one of the major oil and gas producing areas in Changqing Oilfield. Majiagou Formation is the main oil and gas reservoir in this well and is a low-porosity and low-permeability reservoir. In this paper, the physical and chemical properties of mercury, mercury intrusion experiments and observation of cast thin sheet were used to test and analyze the samples taken from more than 260 core samples. The porosity and porosity characteristics, Pore type situation. The results show that the mean porosity of the 5th member reservoir is 3.78%, the permeability of 78.3% of the samples is less than 0.5 m D, and the average pore throat radius of the selected sample is 5.17 μm, and the separation is poor. The carbonate rocks in the fifth member of the Ma-5 reservoir are composed of dolomite, calcite, argillaceous, siliceous, illite and pyrite. The pore types observed in the microscope are dissolved seams, dissolved pores, Paste hole and structural cracks, often accompanied by the crystallization of different mineral filling.