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盘古梁西长6段油藏是陕北近年来提交探明储量和开发建产的重要区域。文中对盘古梁西长6段油层组储层岩石学特征、孔渗特征、微观孔隙结构特征及类型进行了深入分析,结果表明:该区长6段储层属三角洲前缘亚相沉积,储层具有成分成熟度偏低、结构成熟度中等的特点,储集空间主要为残余粒间孔和粒间、粒内溶孔及长石溶蚀形成的铸模孔;影响储层储集性能的主控因素较多,包括沉积微相、成岩作用、非均质性等多个方面;对储层发育影响最大的成岩期主要位于中成岩A期—中成岩B期;绿泥石膜残余粒间孔相、长石溶蚀相和浊沸石溶蚀相是最有利储层发育的成岩相带;通过微观非均质性研究,可区分出5种驱油类型。
Pangu Gulwang Xichang 6 reservoir in northern Shaanxi in recent years to submit proven reserves and development of an important area for production. In this paper, the petrological characteristics, porosity and permeability characteristics, microscopic pore structure characteristics and types of the reservoir in the 6th member of the Block, Xichang, Panguliang are analyzed in depth. The results show that the reservoirs in the Chang 6 member of the Chang 6 member are delta front facies sediments, Low maturity of the composition and medium maturity of the structure. The storage space is mainly composed of residual intergranular pores and intergranular, intragranular dissolved pores and the feldspar formed by feldspar dissolution. The main controlling factors affecting the reservoir performance are Including sedimentary microfacies, diagenesis and heterogeneity. The diagenetic stage that has the most influence on the reservoir development is mainly located in the middle-diagenetic stage A-middle diagenetic stage B; the residual intergranular pore phase of chlorite film, The feldspar dissolution facies and laumuzeolite dissolution facies are the diagenetic facies belonged to the most favorable reservoirs. According to the study of microcosmic heterogeneity, five types of oil displacement can be distinguished.