Joint Interpretation Techniques with Different Azimuth Data to Depict Complex Fault Systems and Reservoirs

Abstract

The Kongnan area is located in Huanghua depression of Bohai Bay basin in northeast China, where there are complex paleogene fault systems that dissect the area into many different types of reservoirs. It is very difficult to accurately identify the fault systems and to depict the boundaries and interior of the reservoirs with conventional seismic data and seismic interpretation techniques. In order to solve these problems high-density wide azimuth seismic data have been acquired in this area and through processing migration stack data and pre-stack migration gathers from different azimuths have been obtained. Based on these different azimuth seismic data complex fault systems have been accurately identified and reservoir boundaries have been accurately delineated by using a series of techniques including fault system optimal identification technique with different azimuth seismic data joint interpretation, reservoir characterization technique with different azimuth seismic data joint interpretation, special lithologic body recognition technique with different azimuth seismic data joint interpretation, azimuth AVO detection, and azimuth multi-attribute fracture detection. The success rate of drilling has been greatly improved by using these techniques, suggesting the feasibility and effectiveness of our methods.