真曹地区戴一段沉积微相特征及砂体分布定量表征研究

Research of the characteristics of sedimentary microfacies and the quantitative description of the sand body in the first member of Dainan Formation in Zhenwu and Caozhuang Oilfield

储层砂体的类型、几何规模及分布规律是研究地下油水运动规律和调整注采井网的基础,可以为储层地质建模提供可靠的定量化地质基础。充分利用岩心、录井、测井和分析化验资料,对工区沉积微相进行研究,工区发育三角洲前缘亚相,主要沉积微相类型为水下分流河道和河口坝,沉积微相平面分布特征为条带型和网状型。在地质特征研究基础上,运用地质统计学方法研究各类砂体几何形态及相互关系,获得了各类微相中砂体的发育密度、宽度和厚度的概率分布,定量表征了主要微相的砂体宽度与厚度及宽度与长度关系,为油田开发后期储层的精细表征提供了扎实的定量化地质基础。

The types,scales and distribution of the sand body in the reservoir are the base of the research of kinematic regularity of oil and formation water,and adjustment of injection-production well pattern,and it maybe the quantitative geologic base for the reservoir geologic model building.By the use of well core,logging and testing material,the sedimentary microfacies was researched.In the work area,the delta front facies are developed,and the main microfacies are subwater channel and mouth bar,and the distribution of the microfacies are belt and reticulates types.Based on the research of geologic features,the geostatistics was utilized to study the configuration and interrelationship of sand body,the probability distribution of the density,width and thickness of sand body for each microfacies,and the quantitative relationship of width and thickness,and width and length of sand body for main microfacies.This research can offer a quantitative geologic base for the accurate description of the production tail reservoir.