Study On The Geological Characteristics Of The Gas Reservoir He8 Down-section In Su14 Area Of Sulige Gas Field

The gas reservoir characteristics of block Su 14 in Sulige gas field are extremely complex,which are characterized by large lateral change of reservoir,low formation pressure,low reserve abundance,low gas well productivity,complex gas water distribution,generally low physical properties of reservoir,small scale of gas reservoir and weak peripheral energy supply.Therefore,it shows strong reservoir heterogeneity,and structural characteristics show that it is difficult to form structural gas reservoir traps.Therefore,according to the existing knowledge of reservoir distribution in Sulige gas field,the target reservoir in block Su 14 is mainly the He8 member at the bottom of Lower Shihezi Formation.It is necessary to carry out fine description,research and development of early gas reservoir in block Su 14 of Sulige gas field,and establish a fine three-dimensional geological model for the He8 member of Lower Shihezi Formation in block Su 14.So as to solve the problem of reservoir heterogeneity and the distribution law of gas reservoir.The purpose of providing reference and model for the development of Upper Paleozoic natural gas in other areas of Ordos Basin.Based on the comprehensive application of geological,logging and testing information,this paper takes petroleum geology,structural geology,reservoir sedimentology,reservoir forming dynamics and reservoir description as theoretical guidance and database as support.Through the comprehensive analysis of geological,logging and test data,dynamic and static combination,the spatial distribution characteristics of reservoir are described in detail,the fine description research of reservoir sand body and effective sand body and the establishment of 3D geological model are carried out.The relatively complete and fine geological understanding of the formation of target layer is obtained.The sedimentary,diagenetic and reservoir forming mechanisms controlling the distribution of He8 gas relative enrichment block in sul4 block are analyzed.The most effective step-by-step stochastic modeling method is adopted,and the plane distribution of gas bearing area and reservoir attributes of He8 member in su14 area is re implemented by using the established 3D model attribute parameters.The reserves of the study area are recalculated.So as to more accurately evaluate the development potential of the research area and screen favorable development blocks.