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保山盆地为滇西的一个具西断东超箕状断陷结构的新近系小型盆地。为搞清区内保山气田的沉积特征,指导该区油气勘探工作,结合沉积岩(物)与沉积环境之间的辩证关系,通过对沉积岩的岩性特征(颜色、岩石类型、岩石结构、黏土矿物、岩相组合)的分析研究,借助于沉积相在测井和地震剖面上的显著特征,研究并划分了保山气田新近系上新统羊邑组二—三段的沉积微相类型。结果表明,在该研究区主要发育了扇三角洲前缘亚相中的水下分流河道、分流河道间、前缘席状砂、河口坝等沉积微相类型,以及浅湖亚相中的浅湖泥和浅湖漫流席状砂沉积微相。剖析各类骨架微相的沉积特征后指出:水下分流河道、河口坝和前缘席状砂为该区最有利的储集砂体。
The Baoshan basin is a Neogene small basin with west-broken eastern hypanthmic rift-subsidence structure in western Yunnan. In order to clarify the sedimentary characteristics of the Baoshan gas field in the area and guide the oil and gas exploration in the area, combining the dialectical relationship between the sedimentary rocks and the sedimentary environment, the lithologic characteristics of the sedimentary rocks (color, rock type, rock structure, clay minerals , Lithofacies assemblages). With the help of the significant features of sedimentary facies logging and seismic profiles, the types of sedimentary microfacies in the second and third sections of the Upper Pleistocene Yanggun Formation in the Paleogene gas field are studied and classified. The results show that the sedimentary microfacies in subaqueous fan delta front, distributary channel, front sands, estuary dam and other sedimentary microfacies are mainly developed in this study area, and shallow lakes in shallow lake subfacies Mud and shallow lake diffuse channel sand sedimentary microfacies. After analyzing the sedimentary characteristics of various skeleton microfacies, it is pointed out that underwater distributary channel, estuary dam and front sands sand are the most favorable reservoir sand bodies in this area.