Seismic Interpretation And Reservoir Study In Zhaotong Shale Gas Demonstration Area

With the rapid development of domestic shale gas exploration,currently have wells get industrial gas,shows a good industrial prospect.Wufeng-longmaxi formation is a deep-sea shelf facies deposit,which is a favorable belt for the development of high-quality shale gas reservoirs,and it is the main layer of shale gas exploration.The overall structure of zijin dam YS115 is stable,so this study was carried further exploring the thickness of sedimentary strata,distribution and burial depth in the exploration area,and implemented the change rule of geological structure and fracture distribution,emphasized to carry on the "dessert" forecast at lower silurian series the dragon stream groups-on ordovician Wufeng formation and researched on drilling well deployment plan.This paper is based on the fine seismic data interpretation of zhaotong shale gas demonstration zone zijin dam region.The strata in the YS115 well area were calibrated in detail,and the faults were graded and evaluated,and the underground structural characteristics were restored by using the velocity construction field.After optimizing the sensitive parameters which affecting the analysis of reservoir,reservoir prediction analysis was done with prestack inversion,then the fault,ground stress and formation pressure prediction analysis also completed during this study,finally finished the “dessert”comprehensive evaluation for the shale reservoir.During the study found that zijin dam YS115 wellblock rob syncline is completed,and is in favor of preservation of shale gas,but because in the in-situ stress transition belt and complex structure,the west to the influence of the big snow mountain anticline,and larger fault scale,crack development,shale gas preservation condition is bad.The reservoir geology and engineering indicators in this work area are generally good,and the favorable area for the deployment of the shale gas to the slanted flanks and xingwen to the oblique south wing is comprehensively evaluated and the "sweet" area 103.2km~2 is comprehensively evaluated.In view of the geological conditions of fractures in this area,it is of great practical significance to carry out the prediction of fracture earthquake prediction,which is of great reference significance for further implementation and expansion of the construction area.