鄂尔多斯盆地合水地区长8油藏沉积微相特征及单砂体刻画研究

Research on Sedimentary Microfacies and Single Sand Body Characterization of Chang 8 Reservoir in Heshui Area, Ordos Basin

摘要: 储层沉积微相及单砂体刻画是油藏精细描述的基础工作，研究利用钻井、测井、岩心及录井等资料，结合开发动态数据，以区域标志层为依据，进行新井小层划分和老井小层修正工作，结合区域沉积环境和已有的沉积研究成果，从单井岩心观察出发，根据取芯井的岩石类型、颜色、沉积构造、旋回序列，以及生物化石、粒度特征等资料，进行单井微相和剖面微相的识别和划分。在精细地层对比、沉积微相研究基础上，对不同类型的单砂体进行识别，确定单砂体边界及类型；利用层序地层学、沉积岩石学方法、测井等技术精细刻画长8油藏单砂体的空间展布、纵向叠置关系及平面接触关系，分析剩余油分布规律，评价储量动用程度，为后期剩余油挖潜提供对策。

Abstract: Reservoir sedimentary microfacies and single sand body characterization are the basic work of fine reservoir description. Research and use of drilling, logging, core and logging data, combined with development performance data, based on regional markers, is the basis for small new wells. Stratum division and correction of small layers in old wells, combined with regional sedimentary environment and existing sedimentary research results, starting from single-well core observation, according to the rock type, color, sedimentary structure, cycle sequence of the core well, as well as biological fossils and grain size features and other data to identify and classify single well microfacies and profile microfacies. On the basis of fine stratigraphic correlation and sedimentary microfacies research, different types of single sand bodies are identified, and the boundaries and types of single sand bodies are determined; use sequence stratigraphy, sedimentary petrology methods, logging and other techniques to finely characterize Chang 8 Oil the spatial distribution, vertical overlap relationship and plane contact relationship of single reservoir sand bodies, analyze the distribution of remaining oil, evaluate the degree of production of reserves, and provide countermeasures for later exploitation of remaining oil potential.