子长热寺湾井区储层特征及其评价

Characteristics and Evaluation of Reservoir in Zichang Resiwan Well Area

针对子长热寺湾井区储层特征认识不足的问题,应用岩石薄片、扫描电镜、X衍射、粒度分析、压汞测定等资料,对长2、长6储层的岩石学特征、孔隙类型与孔隙结构特征、物性特征、成岩作用、非均质性特征、储层敏感性及润湿性等进行了深入分析。结果表明:研究区储层以中砂质细粒长石砂岩为主,孔隙类型主要有溶蚀粒间孔和剩余粒间孔,孔隙结构具有均质性较强的特点;成岩作用以压实作用、胶结作用和溶蚀作用为主;根据储层个特征参数,认为长2储层为特低渗透层与超低渗透层,长6储层为超低渗透层。

Aiming at the lack of research on reservoir characteristics in Zichang Resiwan well area, petrology characteristics, pore types and pore structure, physical characteristics, diagenetic effect, heterogeneity, sensitivity and wettability of Chang2 and Chang6 formations were studied by the means of rock flakes, scanning electron microscopy,X diffraction, analysis of particle size, determination of mercury. The results show that the reservoir in the study area is dominated by medium grained feldspar sandstone, and the pore types are mainly intergranular pores and residual intergranular pores, and the pore structure is characterized by strong heterogeneity, diagenesis, cementation and dissolution; Change2 is special-low and ultra-low permeability reservoir, and Chang6 is ultra-low permeability reservoir.