Comprehensive evaluation technology of continental shale oil geology in Biyang sag and its application

Through comprehensive geological research on continental shale formations in Biyang sag,8 key geological evaluation technology series have been formed,namely petrology analysis,well logging reservoir evaluation,mud logging reservoir evaluation,seismic reservoir prediction,resource evaluation,target area selection evaluation,optimization design of horizontal well and development plan optimization.After successful application of these 8 geological evaluation technologies on continental shale formations in exploration practice of Biyang sag,the following aspects have been made clear,namely the lithofacies type of Biyang shale reservoir,the reservoir space types and development characteristics,the logging response characteristics,the reservoir seismic response characteristics,the fracture distribution and the shale oil resources scale.On the basis of these,by use of the target zone optimization evaluation technology and in combination with logging,mud logging and seismic reservoir prediction evaluation results,the favorable target zone for shale oil exploration in Biyang sag has been optimized out.The deployment of two horizontal wells for shale oil has achieved the breakthrough in continental shale oil exploration,which confirms the good exploration potential of shale oil in Biyang sag.By use of the preliminary design of the development optimization design technology,the development pattern of No.5 shale reservoir has been achieved,which provides the guarantee for shale oil in the late development.