The Southern Edge Of Junggar Basin Changji Anticline Structure Modeling And Structural Interpretation

The ChangJi anticline lies in the first anticline belt of south of Junggar basin, it is a good oil and gas trap. But by now, because of its complicated structure and the bad surface conditions to obtain seismic data, the structure question becomes the first question that we must to resolve in order to find hydrocarbon.This thesis bases on the advanced theory of modern tectonics -fault related fold theory, and directed by the interpretation method that grounds on model, with the help of balanced cross section technique, seismic forward model and 3D visual technique, unites the other data such as outcrop and well drilling data, we interpreted the seismic data of ChangJi anticline in detail. The following conclusions are gained:1. The main reason of ChangJi anticline form is the wedging of triangle zone.2. There is difference at structure character between the east of anticline and the west of anticline, the reason is triangle zone wedged into different incompetent layer in east and west. The conversion between east and west is a tear fault.3. The pop-up structure causes the south limb of anticline is steeper than the north limb of anticline.4. The low angle thrust fault at section bottom branched forward in piggy-back thrusting style, in the west of anticline they become imbricated thrust structure; in the east of anticline they become antiformal duplex structure.The south of Junggar basin; ChangJi anticline; Fault-bend fold;Triangle zone; Balanced cross section; Structural model...