Abstract:

Abstract: Faultblock groups are the most important ‘cradle’ for oil/gas traps in Dongpu Sag whose distinctive tectonic setting and local deformation offered favorable conditions for the formation of complex faultblock groups. Based on exploration and development data, we studied the characteristics, formation mechanism, reservoirforming condition, and exploration potential of the complex faultblock groups. Besides the general features of faultblock groups, the distinguishing characteristics of these groups in Dongpu Sag are of mirror image relationships both in vertical and horizontal directions. The complexity of the faultblock groups is related to varying dynamics, multiphase extension, complicated local deformation condition and different deformation rocks. Dongpu Sag contains good source rocks, reservoirs and cap rocks. The fault blocks here serve as elementary oil/gas accumulation units. Although an individual fault block may be small, the faultblock groups form favorable traps with the faults acting as major migration paths. The faultblock groups in Dongpu Sag have great exploration potentials, and can still be regarded as major exploration targets in the future.

Key words:  , Key words： formation mechanism, hydrocarbon reservoir, exploration potential, complex faultblock group, Dongpu Sag