Identification Of Lithologic Traps In The Menber Of Qingshuihe-1 In The Area Of SN16B-SN44 Of The Junggar Basin

This paper is to find out the characteristics of the sedimentary characteristics of the sand layer and the vertical and horizontal faults in the area of SN16 B and SN44 and,re-check and implement the fault block,low amplitude structure,stratigraphic-lithology and other types of traps.According to the Cretaceous and Jurassic in the study area,the structural interpretation of the target horizon is completed,and the reservoir conditions in the section of the Qingshuihe Formation are predicted by conventional inversion and prestack inversion.The use of these explanations to carry out the identification of lithologic traps,preferably with oil and gas favorable zone.Based on the fine interpretation of tectonics and lithology,in this paper we predict and analyze the lithologic traps by the seismic inversion results.We predict favorable zones for oil and gas with analysis of petroleum geologic characteristics.The lithologic traps are identified and evaluated by the seismic attribute analysis results,inversion results,and sedimentary facies division results.The results are predicted by three-dimensional visual structure fine interpretation,seismic reservoir prediction,sedimentary microfacies with seismic data and logging data.The sedimentary microfacies of the K1q12 sand group in the main purpose of the study area is the delta front subfacies and the underwater distributary channel is the main microfacies type,which has the possibility of forming lithologic traps.Moreover,from the tectonic setting,the slope area in the northern part of the study area is a favorable area for the formation of lithologic traps.In particular,the K1q12 sand group in the Cretaceous Qingshuhe Formation is monoclinic,is the ideal place to form lithologic trapsFour lithologic traps were identified in the K1q12 sand group of Qingshuihe Formation in the study area.Among them,the lithology traps of SN49 wells were more reliable and the reservoirs were in good condition and were in the direction of hydrocarbon migration,and become a favorable area for exploration of lithologic oil and gas reservoirs in this area.