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针对以往利用三维纵波地震资料无法准确预测川西地区深层致密砂岩裂缝,特别是网状发育的规模裂缝系统的难题,在川西地区实施了三维多分量地震勘探。充分利用三维多分量地震纵横波地震属性、方位各向异性以及横波分裂现象估算裂缝发育的方位和密度,较好地解决了川西新场气田须家河组超致密砂岩裂缝网络系统的预测问题,为勘探和开发井位设计提供了可靠依据;同时,形成了针对不同尺度裂缝的预测方法和技术流程。钻探证实,三维多分量地震技术在川西新场地区深层致密砂岩裂缝预测中效果显著,钻井成功率由过去的50%提高到了89%。
In view of the difficulty of using 3D P-wave seismic data to accurately predict the scale-fracture system of deep tight sandstone in western Sichuan, especially for the reticular development, 3D multi-component seismic exploration was implemented in western Sichuan. The azimuths and densities of fracture development are estimated by using the seismic attributes, azimuthal anisotropy and shear-wave splitting phenomenon of 3D multi-component seismic longitudinal-shear wave, so as to solve the prediction problem of the fractured network system of ultra-tight sandstone in Xujiahe Formation in Xinchang Gas Field, Which provides a reliable basis for the exploration and development of the well location design. At the same time, a prediction method and a technical process for cracks of different scales are formed. Drilling confirmed that the 3D multi-component seismic technique has achieved remarkable results in the prediction of deep tight sandstone fractures in the Xinchang area of western Sichuan, with drilling success rate increased from 50% to 89%.