Study On Reservoir Characteristics Of Chang 6 Reservoir Formation In Huanjiang-Liu Maoyuan Area

This paper is direct at the problem that there is no clear understanding of Characteristics of sedimentary microfacies,Reservoir diagenesis,physical characteristics and Reservoir quality of Chang 6 reservoir in Huanjiang-Liu Maoyuan area,it's main research targets is reservoir characteristics and main means are region analysis,Core and thin sheet observation,Analysis test and so on,at the same time it use sedimentary petrology,reservoir geology and other subject as it's theoretical direction,then fully investigating the results of previous research and combining the experimental data and analyzing the results of the test,make a study of Reservoir related content in study area.First,According to the color of mudstone,sedimentary structure and logging facies,etc.,The sedimentary facies of the chang 6 reservoir are divided into delta front subfacies,underwater distributary channel and inter distributary Bay microfacies.The development degree of underwater distributary channel is relatively high.Based on the analysis of sand body data obtained,the thickness and distribution trend of sand bodies in different sand formations are studied.The direction of its distribution is mainly NE-NW,and part of NE-NW is distributed.Secondly,the diagenesis types of Chang 6 reservoir were analyzed by casting thin slice,scanning electron microscope and related experimental results.According to vitrinite reflectance,eosinite / monolayer minerals,paleogeothermal,particle contact relationship and pore type are divided into lithological stages.The main diagenesis types in this area are mechanical compaction,cementation and dissolution.The diagenesis stage is mainly in the A stage of middle diagenesis.Based on the study of diagenesis,combined with the characteristics of sedimentary equality,diagenetic facies are divided into five types and the distribution trend of diagenesis is analyzed.Using the data and physical properties,mercury injection test and Xray diffraction data were identified under thin slice microscope,the petrological characteristics of reservoir clastic components,rock types,rock structures,macroscopic physical properties such as lateral and vertical porosity and permeability changes,pore and throat types,size,distribution are studied.The micropore structure of reservoir is classified and evaluated.The porosity in this area is divided into two types: single pore type and complex pore type,and the distribution curve is divided into three types.The throat is mainly micro-throat,and the four types of throat are visible in this area,The distribution curve also shows three forms.On the whole,the reservoir is mainly low porosity and super low permeability reservoir.Finally,on the basis of the above research,the types of rock types and sand body thickness,sedimentary facies and diagenetic facies,reservoir physical properties are considered synthetically.Combined with the classification standard of Changqing Oilfield,the microcosmic pore throat structure and other factors established the classification and evaluation standard suitable for Chang 6 reservoir in the study area.The reservoir is divided into four categories,and the reservoir is evaluated.