Prestack Kirchhoff time migration of 3D coal seismic data from mining zones |
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| Authors: | Yijun Yuan Yuan Gao Liying Bai Zhanzu Liu |
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| Institution: | 1. Key Laboratory of Geo‐detection, Ministry of Education, 100083 Beijing, China;2. School of Geophysics and Information Technology, China University of Geosciences, No. 29 Xueyuan Road, Haidian District, 100083 Beijing, China;3. Anhui Coal Geology Bureau, JSW Group, Suzhou, China;4. China Petroleum Engineering, Beijing, China;5. Geophysical Research Institute of BGP, CNPC, China |
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| Abstract: | Conventional seismic data processing methods based on post‐stack time migration have been playing an important role in coal exploration for decades. However, post‐stack time migration processing often results in low‐quality images in complex geological environments. In order to obtain high‐quality images, we present a strategy that applies the Kirchhoff prestack time migration (PSTM) method to coal seismic data. In this paper, we describe the implementation of Kirchhoff PSTM to a 3D coal seam. Meanwhile we derive the workflow of 3D Kirchhoff PSTM processing based on coal seismic data. The processing sequence of 3D Kirchhoff PSTM includes two major steps: 1) the estimation of the 3D root‐mean‐square (RMS) velocity field; 2) Kirchhoff prestack time migration processing. During the construction of a 3D velocity model, dip moveout velocity is served as an initial migration velocity field. We combine 3D Kirchhoff PSTM with the continuous adjustment of a 3D RMS velocity field by the criteria of flattened common reflection point gathers. In comparison with post‐stack time migration, the application of 3D Kirchhoff PSTM to coal seismic data produces better images of the coal seam reflections. |
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| Keywords: | Coal Seam Post‐stack Prestack |
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