Structural Characteristic Study Of Chaluhe Fault Depression Of Yitong Basin

Yitong is a Cenozoic sedimentary basin.It develops into Moliqing faulted depression, Luxiang faulted depression and Chaluhe depression three secondary structural units.Since the beginning of the exploration,it has been proved that this area has the features of the biggest exploring area,lowest exploring level,the largest quantities of residual resources and the greatest exploring potential.But the three dimensional seismic data of this are has the problems of closing error,utilization variance and azimuth inconformity waiting to be made clear.This essay aims to join together the seismic data of different work areas in unifying azimuth,correcting closing error and balancing energy by carrying out Explanatory goal tie processing,thus laying a good data foundation for the research work.This study also researches into the overall structural features of Chaluhe fault depression by making use of the former research results and analysis comprehensively.This essay tries to establish Strike slip extending-Strike slip extruding structural interpretation model for Chaluhe. It also tries to identify the structural patterns,such as figure structure,fault block,fault terrace etc.Fracture character has the features of Strike slip extending and wrenching strike slip,as well as the regular patterns of zonation on the plane and periodization along longitudinal direction. Combining the overall structural interpretation of Yitong basin Chaluhe depression,this study puts forward three structural unit division,which is northwestern fault-fold belt,mid-slope belt and southeastern differential uplift belt.And the Middle of the depression has several transverse accommodation zones.The essay also defines that the differential evolution of the north-south depression has the nature of north-south section and up longitudinal staging through structural evolution analysis.The study aims to make it clear that there are two big provenance systems-steep slope belt and gentle slope belt and that the east-west provenance systems contribute to a better birth, reservoir and caprock conditions of Chaluhe depression. To carry out favorable area optimization and fine evaluation,through analysis of comprehensive constructural research and reservoir deposition system,I think exploring preferences should be given to Chaluhe northwestern fault-fold belt,Xin’an Bao transverse accommodation zone,BoNihe-Taiping transverse accommodation zone,southeastern differential uplift belt,etc.And these areas possess the features of forming structural reservoir, fault lithologic reservoir and lithologic reservoir,etc.