Borehole seismic:A bridge connecting multiple oil and gas exploration methods
CAI Zhidong1,2,3
1. School of Geophysics and Information Techno-logy, China University of Geosciences(Beijing), Beijing 100083, China; 2. New Resources Geophysical Exploration Division, BGP Inc., CNPC, Zhuozhou, Hebei 072751, China; 3. Optical Science and Technology(Chengdu) Ltd., CNPC, Chengdu, Sichuan 611730, China
Abstract：With the research deepened in oil and gas exploration and development, continuous progress is made in a variety of exploration technologies in aspects of geology, drilling, geophysics, etc. The comprehensive application of many methods has become an inevitable trend. However, there are data and descriptive scale differences between different exploration methods. Borehole seismic technology plays an important role in the joint application of various exploration methods owing to the high signal-to-noise ratio, wide frequency band and rich wave-field information of its data. Based on the characteristic analysis of borehole seismic data, this paper summarizes the bridge role of borehole seismic technology in various exploration methods. Firstly, it can be used for resolution compensation, fine horizon calibration and logging curve correction between drilling and seismic methods. Second-ly, its well-controlled time-to-depth conversion, prediction of formation depth and physical properties of reservoirs play a crucial part between time-and depth-domain exploration methods. Thirdly, it provides technical supports in the joint P-and S-wave seismic exploration methods via the study of seismic wave properties, the transformation between P-and S-wave domain, the calculation of fitting S-wave acoustic velocity, and the P-and S-wave joint inversion. Fourthly, it has been applied in the process of seismic exploration extending to fine reservoir development, functioning for seismic geological guidance, fine structure interpretation, well-controlled formation attribute optimization and reservoir fracturing monitoring. Finally, it builds a bridge for the joint research of reservoir static description and dynamic monitoring, especially the time-shifting borehole seismic technology and optical fiber sensing technology, which have shown good application prospects in this field.
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