Angle domain imaging processing and anisotropic characteristics of narrow azimuth streamer seismic data
LIU Jun, LIU Daoli, ZOU Yaming, BAI Haijun, ZHANG Wenzhu, WANG Qinghui, WANG Guoquan
1 CNOOC Deepwater Development Limited, Shenzhen 518054, China 2 Shenzhen Branch of CNOOC China Limited, Shenzhen 518054, China 3 National Key Laboratory of Petroleum Resources and Engineering, China University of Petroleum-Beijing, Beijing 102249, China 4 CNPC Key Laboratory of Geophysical Exploration, China University of Petroleum-Beijing, Beijing 102249, China
Due to the narrow azimuth range of offshore streamer seismic data, it is often limited in predicting complex reservoirs such as fractures using anisotropic features. Therefore, how to effectively increase the azimuth range of offshore streamer data, extract the anisotropic features of the imaging gather, and characterize fractured reservoirs is crucial. The paper studies the imaging processing methods for narrow azimuth streamer seismic data and analyzes the anisotropic characteristics of processed gathers. We establish a set of effective imaging processing flow of narrow azimuth towing cable data. On this basis, an effective prestack anisotropy inversion is carried out to show the underground fracture density. By using local angle domain imaging processing technology, the azimuth information of narrow azimuth streamer seismic data can be increased, and has the ability to output the omni-directional reflection gather data in the angle domain. In this paper, the seismic data of the buried hill exploration area in the Pearl River Mouth Basin are selected for application research, and the omni-directional migration imaging results significantly improve the imaging effect of the buried hill fracture development area. Moreover, the parameters characterizing the development of fractures in the buried hill can be effectively inverted by using omni-directional angle domain reflection gather data. The actual data application results indicate that the narrow azimuth streamer data imaging processing technology in the angle domain and the anisotropic parameter inversion method proposed in the paper can effectively describe buried hill fracture reservoirs, determine high-quality target areas for fracture development, and can be applied in the exploration and development of other similar buried hill hydrocarbon reservoirs.
