A Study On The Physical Outcrop Analogy Of The Clastic Rock Reservoir

As a geological body directly exposed under the action of geology,the outcrop is well received by geologists for its intuitionistic,complete,accurate,easy to study and verifiable characteristics.Outcrop analogy is a new oil and gas exploration method which takes outcrop reservoir as the main body and integrates information of underground reservoir.This research method is accompanied by all stages of oil and gas reservoir development,providing an important basis for the formulation of oil and gas exploration and development strategies at all stages.This paper selects the outcrop rock of the Carboniferous Shanxi formation in the the Liujiang basin of the Shimenzhai,Funing County,Hebei province.Through systematic sampling,the reservoir rock in the outcrop area is reasonably sampled.On the basis of macroscopic and microscopic study of the samples,the rock types of the reservoir rocks in the study area are determined.The characteristics of the type and component of the reservoir have clearly defined the diagenesis and diagenesis of the reservoir rocks in the study area,and the types and properties of the reservoirs are studied.Finally,a two-dimensional pore and permeability model of the reservoir in the outcrop area is established.Through the study of the outcrop reservoirs in the Permian Shanxi formation of the the Liujiang basin,Qinhuangdao,it is shown that the physical properties of the outcrop reservoirs are measured by the air method(conventional method)and the pulse method respectively.It is found that there is a strong linear relationship between the physical properties of the outcrop reservoirs measured by the two methods,and the reservoir rocks in the outcrop area are mainly quartz sand.The rock and siltstone with high quartz content and the lowest feldspar content are the three diagenesis mainly through mechanical compaction,cementation and dissolution,and the diagenetic stage is located between the B subsection of the early diagenetic stage and the A subsection of the middle diagenetic stage,and the reservoir pores are mainly secondary pores and the primary voids are very few.Or only part of the reservior is retained;through the study of reservoir physical properties,the reservoir of the study area belongs to the type of ultra low and ultra low porosity and ultra low permeability reservoir.The vertical and parallel layer samples have the same physical property change law,which is closely related to the vertical lithologic sequence of the strata,and the physical property of the medium sandstone is the best.The study of reservoir heterogeneity shows that the heterogeneity of reservoir is relatively high.