【摘要】 准噶尔盆地西北缘风城地区二叠系风城组岩性复杂,岩性主要以泥质白云岩为主,储层表现为裂缝—孔隙双重介质特点,预测裂缝发育走向和密度是油气勘探的关键环节之一。通过对比分析目前各类裂缝预测技术,选择了叠前方位各向异性裂缝检测技术。首先开展方位角各向异性正演模拟,确定该区各向异性的主要因素,其次进行了地震资料分方位角处理,完成叠前地震方位各向异性属性的计算。结合井资料对该区裂缝发育强度和走向进行预测,指明了进一步油气勘探的方向,后续钻探结果表明,裂缝预测结果与钻井结果吻合较好,证明此项技术在该区行之有效。更多还原

【Abstract】 Lithology is complicated in Permian Fencheng Formation of Fencheng Field in the northwestern margin of Junggar Basin. It is dominated by mud dolomite and has pore-fracture dual media reservoir. To predict fracture strike and density is one of the key parts of oil and gas exploration. The fractured reservoir prediction technique based on P-wave azimuthal anisotropy using prestack seismic data is selected by comparing all kinds of fracture prediction techniques. First, forward modeling based on azimuthal anisotropy is conducted, determining main factors of anisotropy. Secondly, different azimuth seismic data processing is made, and azimuthally anisotropic attributes using prestack seismic data are calculated. Combined with data of the well, fracture strike and density are predicted, and the direction of further oil and gas exploration is pointed out. Drilling results prove that the predicted results are coincident with drilling results, and the technique is feasible in the area.更多还原