Study On Sedimentary Facies Analysis And Reservoir Prediction Of Deep Compact-sand Conglomerate In The Eastern Part Of Xujiaweizi

It is a key area for oil and gas exploration to develop the dense gravel conglomerate with gas in Xujiaweizi.However,at present,there is no division in the inner sequence of Shahezi subgroup,and there is no clear understanding of sequence sedimentary laws,and the zone of oil and gas accumulation zone is not clear.This paper applied in fully expanding exploration and comprehensive analysis of the eastern region based on the seismic,logging and other related information in sedimentology,sequence stratigraphy and seismic reservoir prediction theory as the instruction,completes the Shahezi subgroups in the study area within the structure interpretation of thin layered sequence,sedimentary facies research and reservoir prediction,and divides the favorable zone.In this study,based on the well log data,combined with the feature of seismic reflection,well seismic joint system layer,completed the Shahezi subgroups within thin layered sequence interpretation,and completed the Shahezi subgroups T41,T41 a,T41b,T41 c,T42 reflector structure diagram,and preliminary study the Shahezi xudong area child internal sequence structure,fault and trap features.Based on the analysis and division of single well sedimentary facies,the seismic attributes were selected,and the distribution of sequence sedimentary distribution within the Shahezi formation was determined by using the amplitude of peak amplitude.Seismic attribute analysis and seismic inversion technique are the main means to predict effective reservoir.Environment for multiple well curve correction and normalization preprocessing methods on the basis of well curve,rock physics analysis application well curve,optimizing sensitive parameters,using gamma and vertical and horizontal wave velocity than the SEC to distinguish mudstone and sandstone(glutenite,coarse sandstone,fine sandstone and siltstone),on the basis of lithology distinguish,use of effective reservoir density identification,on this basis,through the post-stack,pre-stack inversion,reservoir prediction,the quantitative characterization of Shahezi subgroups within the reservoir characteristics of each sequence,integrated the above research,combining with gas source and caprock distribution,predicting favorable areas.Combined with the research and analysis of data explanation,on the basis of the following conclusions 1.For Xujiaweizi the region east of the types of sedimentary facies are mainly braided river delta facies,fan-delta facies,lacustrine facies;2.In xudong area of shahe sub-group,the delta front of the delta is located in the northeast area of the working area.3.Multi-parameter combined seismic inversion can better distinguish lithology and reservoir in a single inversion.4.The optimal method for the prediction of the dessert zone of the comprehensive structure,sedimentation,sand body,source rock and reservoir is formed,and the two types of favorable zones are divided into two categories.