Broadband and high-precision sesmic processing technology and its application on offshore deep lithology exploration
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摘要:
近海平缆三维地震资料的宽频高精度处理在岩性油气藏勘探中越来越受到重视，但尚缺少专门分析论述。以东海西湖凹陷西斜坡深层精细岩性勘探为目标，通过发展波动方程延拓迭代减法去除鬼波、叠前综合多域去噪、浅水区组合去多次波，以及基于目标体的精细速度建模和偏移成像等技术手段的综合应用及效果分析，建立了海上平缆三维地震资料的宽频高精度处理技术流程，并将其应用于西湖凹陷西斜坡实际资料处理中，实现高分辨率宽频保幅高精度地震处理。利用宽频资料开展深层岩性油气藏的精细描述，有效实现了油气田增储扩边和深层优质岩性气田新发现，以助力海上深层岩性油气藏勘探开发。
Abstract:Broadband and high-precision processing of offshore horizontal cable 3D data is receiving increasing attention in the exploration of lithological oil and gas reservoirs recently. However, specialized analysis and discussion are lacking. The broadband high-precision processing technology of 3D data of offshore horizontal cables was systematically summarized, and the procedures of broadband high-precision processing and key technologies of horizontal cables in shallow water area were established, including mainly the deghosting in horizontal cables, pre-stack integrated multi-domain denoising, shallow-water multi-wave combinational suppression, and target-based fine-velocity modeling and fine-migration imaging, etc. By applying real data on the western slope of Xihu Sag, the broadband, amplitude-preserving and high-precision seismic results with improved resolution were obtained. The reservoir inversion and geological evaluation carried out by the results are in good agreement with new drillings, from which the geological viewpoint obtained is more reasonable.
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