The Comprehensive Evaluation Of Shale Gas Geological Sweet Spot In The Longmaxi Formation Of The Luobu Syncline In North Yunnan And Guizhou

In this paper,the study area is located at the intersection of Yunnan,Guizhou and Sichuan provinces.The earth tectonics belong to the southwestern edge of the Yangzi land formation area.Its'Wufeng-Longmaxi formation is a deep-sea land shed sedimentation,one of the favorable zones for the development of high-quality reservoirs of shale gas.It is also the main layer of shale gas exploration.The predecessors have made a comprehensive geological evaluation of shale gas in the northern region of Yunnan and Guizhou.They selected the northern Muai-Dazhai exploration as favorable zone,an area of 1546 km~2with geological resources of about 930 billion square,including the Luobu syncline.In order to further implement and expand the construction of the production area,Zhejiang oilfield gained 335 km~23D seismic data in Luobu syncline,including Phase I implementation 121.1 km~2,Phase II implementation 120km~2.The work of this paper focuses on(phase II),and the continuation of(phase I).Based on the fine explanation of seismic data,try to find out the thickness,distribution range and depth of the sedimentary formations in the exploration area,the implementation of the spatial combination and spread of faults in the industrial area,and the classification of faults,analysis of the impact on the storage conditions of shale gas.Based on fine structural interpretation,the reservoir index is predicted by pre-stack and post-stack inversion techniques,and its impact on the distribution of shale gas"sweet spots"in the study area is analyzed.Based on the analysis of the relationship between the scale of faults in other working areas in northern Yunnan,Guizhou,and the initial wellhead pressure,the faults in the study area are divided into four categories according to their influence on the preservation of shale gas.Evaluation of storage conditions.Comprehensive evaluation of favorable area in the I and II Robb syncline is given based on reservoir indicators and preservation conditions.It's helpful for further implementation and expansion of production areas.