Seismic interpretation improvement method for gas cloud areas based on amplitude compensation and traces simulation

Summary Gas cloud is widely known as a specially associated structure caused by hydrothermal fluid action and shows strong absorption and attenuation in the propagation of seismic waves, which will affect seismic data seriously in reflection energy, SNR, frequency and quality of final imaging, and can even lead to many big blank zones in seismic sections. As a result, conventional interpretation as well as reservoir research can hardly be carried out, which brings potential safety hazards to drilling and water injection in oilfield development. Aiming at this problem, we present an imaging improvement method based on amplitude compensation and traces simulation to enhance the affected seismic data and establish a interpretation workflow for gas cloud areas in this paper. The final imaging result of real data processing based on our method is improved obviously and brings a much better seismic interpretation result for both structure and reservoir in one of the most complicated oilfield D in Bohai Bay Basin, where large-scale gas cloud and plenty of faults exists at the same time. Our method is widely applicable to the study of gas cloud areas and will provide a powerful tool in decreasing or avoiding development risks in these oilfields.