Abstract:

Compressional basins widely develop in the mid-western area of China are dramatically different from their originals. In order to understand oil and gas resource potential of these compressional basins, analyse petroleum geological characteristics of different plays and different structural traps in the same play, their original structures need reconstruct. Then the hydrocarbon kitchen, source-reservoir-cap rock association of the play, traps forming and evolution are studied from geologic historical point of view. Guided by seismic interpretation with the standpoint of balance and based on erosional thickness, reconstruct compressional palaeostructures are conducted horizon by horizon and line by line by using reconstruction point moving extrapolation method. Finally reconstruction of original structure of the studied geological unit is realized in the 3D domain. The results will help geologists to build up a concept of structure evolution, and provide a foundation for in-depth integrated evaluation of petroleum geologic characteristics and for choosing favorable exploration targets.

Key words: compressional basin, seismic data, palaeostructure reconstruction, reconstruction point moving extrapolation method, Turpan depression