Lacustrine Carbonate Sedimentary System Analysis And Dessert Prediction

The lacustrine carbonate rocks in the Leijia-Shuguang area are located in the western sag which is rich in oil and gas resources,which have been found in the large oil and gas fields such as Xinglongtai oil field,Gaosheng oil field,and Lengjiabao oilfield.Gaosheng oil and Dujiatai reservoir is the main source of Shahe Street District four group of carbonate rock layers,due to the needs of the project,Dujiatai reservoir was divided into three groups:Duyi,Duer and Dusan.In this area,the sedimentary environment of the study area is a semi enclosed shallow lake basin.The sedimentary environment of the study area is a semi enclosed shallow lake basin.The Shasi in LeijiaShuguang area is mainly composed of shallow lake and semi deep lake subfacies.Since 2012,with oil companies increasing awareness of Leijia region dense carbonate oil reservoir,the implementation of wells up to ten of the deployment and export,in these wells lei84,lei93,leiping2 achieved considerable results.Through the analysis of new exploration wells found the main control factors of reservoir lithology.And utilization of geological data,logging data in the work area of lithology,physical property and fluid property carries on the preliminary analysis and evaluation;Using the high precision 3 d seismic data for structure interpretation of the work area and tectonic evolution analysis;on the structures,the sequence framework in the study area,divide the system domain;Utilizing the means such as the ancient landscape restoration auxiliary sedimentary system domain division,predict the lacustrine carbonate sedimentary system in the study area.The lake basin in the study area is divided into three level 4 intrafacies: half deep lake-deep lake subfacies,coastal and shallow lake facies,combining the phase.To start west subsags,shuguang subsags,its forlornness up slot is carbonate depositional model is different,and in different subsags ancient water leads to different types of carbonate sedimentary.In water depth is relatively deep half deep lake-deep lake,water power is weak,belongs to the weak reduction environment,development of large thickness of large sets of oil shale,carbonate sedimentary rare in this area.In relatively shallow water depth of shallow lakes,water power is stronger,carbonate rock is the area of development,the carbonate rocks into flake deposition.In the lakeshore zone in more shallow water depth,water power is stronger,belong to the oxidation environment,carbonate and terrigenous clastic composition in the form of thin interbedding of oolitic limestone deposition.Of the region's bay subfacies almost no development.Find the "relative advantage lithology and physical properties are relatively good,rock brittleness,crack relatively good development" optimization "dessert" area,based on the lithology and electrical analysis of lithologic sensitive predict lithologic parameter convergence technology,based on rock physics analysis of prestack inversion method to predict capability,the advantages of the pore and permeability analysis based on reservoir inversion to predict physical property,rock brittleness prediction based on prestack inversion technique to predict rock brittleness,forecasting techniques to predict fracture azimuth Angle cracks.Integrated use of geophysical and geological method,analysis of the lacustrine carbonate sedimentary system in the study area and dessert,classifying predict "dessert" area,respectively,for type I "dessert" area,class II "dessert" area,a comprehensive evaluation of class III "dessert" area.Gradually explored a special identification of lacustrine carbonate dense oil "dessert" the method and train of thought,and achieved better confirmed that to look forward to the future of geological,seismic,well deployment,reserves of budget to provide the reference and basis.