Method of cable floating correction based on combination of gather coherence and ghost reflection traveltime
YAN Zhonghui1,2, WANG Xiaojie1,2, XU Huaning1,2, CHEN Shanshan1,2, YANG Jiajia1,2, YANG Chuansheng1,2
1. Qingdao Institute of Marine Geology, China Geological Survey, Qingdao, Shandong 266237, China; 2. Laboratory for Marine Mineral Resources, Laoshan Laboratory for Marine Science and Technology, Qingdao, Shandong, 266237, China
Abstract：In the high-resolution and small trace distance marine acquisition，due to the inherent problems of equipment，the cable unequal floating effect will be caused，there are some problems，for instance，phase axistremor and uneven NMO correction will be shown on the gather，which cannot achieve the effect of in-phase superposition，and reduce the imaging accuracy of seismic data.The conventional residual moveout correction method is difficult to accurately identify whether residual moveout is caused by the unequal floating of the cable，which will cause errors in the correction results. This paper presents a cable floating correction method based on combination of gather coherence and ghost reflection traveltime. Firstly，the sinking depth of the actual cable is calculated by using the interactive pick-up ghost reflection travel time，and then the initial moveout correction is obtained.Then the reference moveout correction is obtained by the gather coherence and the model reference trace.Finally，the moveout correction is weighted selected by the cross-correlation analysis between the two，and the moveout is applied after smoothing，the phase axis of the data achieves the effect of phase stacking，in order to improve the resolution and imaging accuracy of seismic data. In this paper，combined with the test analysis of model data and actual processing，compared with the conventional cross-correlation cable float correction method，the results show that the correction method in this paper is more accurate and effective in float correction.
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YAN Zhonghui, WANG Xiaojie, XU Huaning, CHEN Shanshan, YANG Jiajia, YANG Chuansheng. Method of cable floating correction based on combination of gather coherence and ghost reflection traveltime. Oil Geophysical Prospecting, 2023, 58(6): 1365-1373.
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