Prediction Of Shale Oil Reservoir Dessert In The First Section Of Qing-1 In The South Of Chagan Lake,songliao Basin

In this paper,taking the Qing-1 member of W82 well area in Songliao Basin as the research unit,under the guidance of multi-disciplinary geological theory,making full use of3 D seismic data and seismic methods,combined with logging,logging and drilling data,the dessert of Qing-1 shale reservoir is predicted.Through the division and correlation of the strata,the sedimentary evolution characteristics of each small layer of the target layer are made clear.Fine structural interpretation of the seismic profile to clarify the structural characteristics of the study area and the development and distribution of faults.By classifying the seismic waveforms and combining with the logging data,the sedimentary microfacies of the sublayers of Qing-1 member are analyzed.Through the screening and analysis of seismic amplitude attributes,the distribution of sand and mudstone in the reservoir is analyzed and its favorable areas are predicted.Based on the results of fine interpretation of seismic data,the reservoir dessert is predicted by seismic inversion method.Based on the characteristics of structure,sedimentation and reservoir,the controlling factors of dessert are analyzed.The results show that the structural characteristics of the study area are obvious,which basically show the structural pattern of western depression and eastern uplift,the local development of slight fault nose structure,the development of a series of NNW-trending normal faults,which are distributed in the northwest part of the area in the shape of wild geese.Delta front microfacies deposits are mainly developed in Qing-1 member,including underwater distributary channel,Interdistributary bay,estuarine bar and front sheet sand,and the provenance direction is southwest.The main type of reservoir is thick mudstone interbedded with thin sandstone,which belongs to the typical mud-wrapped sand assemblage characteristics,and the reservoir characteristics of the upper member of Qing-1 member are more consistent with the shale oil storage mechanism.The upper member of the reservoir is predicted by seismic inversion,and the shale oil dessert is comprehensively predicted by combining the inversion results of several reservoir parameters,and the favorable area of dessert is divided.Based on the analysis of the controlling factors of shale oil desserts,the fault structure has the role of preservation and migration of shale oil,and the distribution ofsedimentary microfacies controls the distribution of dessert favorable areas.the prediction of sand-mudstone interbedded distribution area of reservoir is basically consistent with the distribution of dessert favorable area.