Abstract:

Based on the technique of 3D geological modeling and through analyzing the spatial distribution and mutual dessection of faults with interpreted seismic and drilling data,we have build a structural model for the lower unit of Paleogene Sha-3 Member in Block Wei-95,by which the structural features are recognized,including fault strike and spatial extension.The accuracy and reliability of basic data are crucial to 3D geological modeling,but Block Wei-95 is a typical complex fault-block reservoir,where the stratigraphic correlation is insignificant and the faults are difficult to be identified in many wells,resulting in a series of problems in basic geological studies.During this structural modeling,combining the special techniques of 3D modeling softwares with the basic geological study has played a significant role in several basic geological aspects such as the refined structure location and the refined stratigraphic correlation.Thus many problems that can not be solved by the conventional methods have been solved here,and the model precision has been guaranteed.

Key words: structural modeling, complex fault block, fault model, Mazhai oilfield, Dongpu Depression