Study Of Well Logging Evaluation Of Hydrocarbon Source Rocks And Reservoir Physical Properties Characteristics Of Tight Oil In Jimusar Depression

With the rapid growth of social economy,the application and consumption of petroleum and natural gas resources are increasing day by day,and conventional petroleum and natural gas exploration has entered the final stage,so unconventional oil and gas exploitation is being paid more and more attention.The unconventional tight sandstone reservoirs are characterized by tight lithology,low porosity and low permeability,low natural productivity,low pressure coefficient of gas reservoirs and so on,so it is difficult to exploit.Study on the characteristics and control conditions of low permeability tight reservoir,and to establish an effective evaluation andestimation model is the core content in the field of oil and gas exploration and development in China.Based on the existing data and literature research,this paper studies thecharacteristics of the reservoir physical properties and well logging curve in Jimusar depression,and analyzes the influence factors and main control conditions of the physical properties of tight sandstone reservoirs;Also establish direct contact of well logging response characteristics curve and TOC,using the method of?logR model can calculate and predict treservoir TOC,so it can effectively guiding reservoirdessert distribution and then guiding the practical production and scheme adjustment.The conclusions of this paper are as follows:?1?The reservoir TOC has relate with natural gamma,acoustic,density and resistance,so we can using the method of?logR model to calculate and predict reservoir TOC precisely;At the same time,the predicted TOC which by using the method of?logR model match with the measured TOC,and the accuracy is up to78%;?2?The reservoir of Jimusar depression mainly is tight sandstone and dolomite reservoir,the type of reservoir mainly is pore and fracture?dissolved pore.Thelithology mainly is dolomite,fine sandstone and mudstone,and the reservoir with low porosity and permeability,and porosity is between 2%?10%,the air permeability basically less than 1*10^-3?m²;?3?the distribution of the reservoir in Jimusar depression is more stable,and two sets of desserts are developed,which is a good quality storage group.Besides,the thickness of the upper and lower desserts is more than 20 meters,and depression center is the largest,showing the trend of gradually decreasing toward the edge;?4?Jimusar depression reservoir physical property is mainly controlled bysedimentation and diagenesis,and the main control condition of reservoir compact cementation is cementation,compaction and packing action.Besides,advantageous diagenesis is feldspar clastic and carbonateerosion,dolomitization and dissolution fracture.