鄂尔多斯盆地马家沟组碳酸盐岩储层成岩相测井识别评价

基于岩心分析、常规测井和成像测井等资料，对鄂尔多斯盆地马家沟组五段5亚段-10亚段储层的储集空间类型、成岩作用类型和强度、成岩矿物组合特征等进行了研究。马家沟组五段5亚段-10亚段储层的岩性以粉晶、细晶白云岩为主，储集空间以晶间孔、晶间溶孔和溶孔为主，偶尔伴生成岩裂缝。根据成岩作用、成岩矿物和储层物性，马家沟组五段5亚段-10亚段可划分出晶间孔相、溶蚀相、成岩微裂缝相、压实压溶相、钙质胶结相和膏质充填相6种成岩相。结合成岩相在常规测井曲线上的响应特征，引入成像测井孔隙度谱分析方法，实现了单井成岩相的测井识别，分析结果与试气资料吻合较好。成像测井孔隙度谱的定性分析与常规测井相结合可揭示孔隙的发育状况和分布，判别测井成岩相，为储层评价和预测提供理论指导和方法支持。

Diagenetic facies logging recognition and evaluation of carbonate reservoirs in Majiagou Formation,Ordos Basin

The reserving space type, diagenesis type, and diagenetic mineral assemblages in Member Ma 5₅-Ma 5₁₀ of Majiagou Formation, Ordos Basin are studied based on core observation, conventional logging and image logging data. The results show that the main lithology of Member Ma 5₅-Ma 5₁₀ in Majiagou Formation is dominated by silty and fine crystalline dolomite. The main reserving spaces are dominated by intercrystalline pores, intercrystalline dissolved pores and dissolved pores, occasionally with diagenetic fractures. According to diagenesis, diagenetic minerals and reservoir physical properties, the diagenetic facies are classified into six types, i.e., intercrystalline pore facies, corrosion facies, diagenetic micro-fracture facies, compaction and pressure solution facies, calcite cementation facies and gypsum filling facies. In combination with the response characteristics of diagenetic facies on the conventional logging curves, the imaging logging porosity spectrum analysis is introduced to realize the logging recognition of single-well diagenetic facies, and the analysis results are well consistent with gas production test data. The combination of qualitative analysis on imaging logging porosity spectrum and conventional logging can reveal the development and distribution of pores, and also determine diagenetic facies during logging and provide theoretical guidance and method support for reservoir evaluation and prediction.