The application of OVT domain processing technology in deep CBM exploration in Qinshui Basin
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摘要: 沁水盆地中东部煤层埋深大（大于1 000 m）、煤储层薄且煤层各向异性强，构造褶皱强烈、小构造及裂隙发育，煤体结构破碎等，为提高本区薄煤储层、小断裂、裂缝成像精度及满足岩性解释的需求，开展了宽方位三维地震勘探。为了充分发挥宽方位地震数据的优势，在处理中引入先进的OVT域处理技术，通过道集分选、OVT域五维插值、OVT域叠前时间偏移、方位各向异性校正等关键技术，获得了高分辨率、高保真度的地震数据；在解释中充分利用OVT处理形成的全方位和分方位地震数据。实现了深部含煤地层及其断层、陷落柱、挠曲等微小构造的精细刻画，提高了构造解释的精度及准确性，同时为叠前反演和各向异性研究提供了基础资料，为后期煤层气勘探开发部署提供了技术保障。Abstract: In the middle and eastern part of Qinshui Basin, due to its big buried depth(more than 1 000 m), strong anisotropy of coal seams, strong tectonic folds, development of small structures and fractures, and fragmentation of coal structure, wide azimuth 3D seismic exploration has been carried out in order to improve the imaging accuracy of thin coal reservoirs, small faults and fractures, and meet the requirements of lithologic interpretation. In order to give full play to the advantages of wide azimuth seismic data, advanced OVT domain processing technology was introduced in the processing. Through the key technologies such as gather sorting, five dimensional interpolation in OVT domain, prestack time migration in OVT domain, and azimuthal anisotropy correction, high resolution and high fidelity seismic data were obtained. In the interpreta-tion, we make full use of the omni-directional and square quantile seismic data formed by OVT processing to realize the fine description of deep coal bearing strata and its faults, collapse columns, flexure and other micro structures, improve the accu-racy of structural interpretation, and provide basic data for prestack inversion and anisotropic research, and provide technical support for the later CBM exploration and development deployment.
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Keywords:
- wide azimuth seismic exploration /
- deep CBM /
- OVT processing technique /
- anisotropic /
- Qinshui Basin
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