APPLICATION OF DOUBLE-WIDTH SEISMIC DATA TO FRACTURE PREDICTION IN R GASFIELD OF XIHU SAG
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摘要:
西湖凹陷R气田由于埋藏深、地震资料品质差，常规地震资料处理效果不理想。2016年，通过斜缆宽频+多船宽方位的采集方式得到了高质量的双宽地震资料，分析认为，双宽地震资料具有高信噪比、高分辨率、高保真度的优势。由于R气田H7层以下主要受裂缝控制，裂缝预测的准确性关系到H7层以下油气层的开发效果。以往预测裂缝的方法只能通过地震属性和相干体定性预测，精度往往不高；通过应用双宽地震资料开展裂缝预测，可以得到较为精确的各向异性因子，从而得到裂缝密度的分布，通过裂缝密度可以表征裂缝的发育程度和方向。从预测结果来看，H7层以下裂缝较发育，且裂缝方向与解释大断层方向一致，其中H11层比H8层断裂更加发育，可以很好的解释H11砂体比H8薄但产能比H8高的矛盾；通过求取的裂缝密度，也可以预测甜点的有利发育区。
Abstract:Seismic data acquired from the R Gasfield of the Xihu Sag is poor in quality due to its deep buried depth and the conventional seismic data processing is not efficient enough to meet the requirement of exploration. In 2016, high-quality double-width seismic data were acquired with the method of variable-depth atreamer broadband and multi-vessel wide-azimuth acquisition. Because the oil reservoir below the Layer H7 in the R Gasfield is controlled by fractures, the accuracy of fracture prediction is of significance to the production of oil and gas from the reservoirs below the Layer H7. In the past, the fracture prediction could only be performed with seismic attributes and seismic coherent bodies, and the accuracy was often not so high. By using double-width seismic data to predict fracture now, we can get more accurate anisotropy factor and the distribution of fracture density, which can be used to indicate the development status and direction of fractures. The prediction results prove that the fractures are well developed below the Layer H7, and the extending direction of the fractures is consistent with that of the large fault. Fractures in the Layer H11 are more developed than those in the Layer H8, which can well explain why the productivity of H11 is higher than the H8 but the sand body is thinner. By calculating the density of the fracture, we can also make better prediction of more sweet areas.
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Key words:
- double-width data /
- wide-azimuth acquisition /
- anisotropic strength /
- fracture density /
- Xihu Sag
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