西非深水Preowei构造复杂断裂精细解释及沉积体刻画

基于高密度三维地震资料,对西非深水海域Preowei构造开展复杂断裂精细解释研究,有目的地探索应用了适合该区沉积特点的多种地震实用技术。经反复试验认为,平面(层)曲率参数尤其是最大正曲率属性可以较好地刻画研究区目的层断裂展布特征;时频RGB融合技术能够更加精细地刻画沉积体及其内部小尺度断裂特征。上述技术的成功应用取得了良好效果,针对研究区R759油组在100 km²范围内解释出135条4种样式的断层,查明的断层数是原常规三维地震资料解释结果的1.5倍,揭示了研究区的复杂断裂特征,为精确计算地质储量及合理设计开发方案提供了可靠依据。

Based on high density 3D seismic data,complex fractures were interpreted and studied in detail on Preowei structure,deep sea of West Africa.Many practical techniques applied on the sedimentary features were explored purposefully.2D horizontal curvature attribute especially the most positive curvature attribute was adopted to effectively reflect the feature of fracture distribution in this area after many tests.The time-frequency RGB fusion technique can be used to accurately describe sedimentary body and small fracture characteristics in it.Good results were achieved by the successful application of above effective technology.The 135 faults of 4 styles were interpreted with the range of 100 km² among the R759 oil-bearing group in this area.The number of faults was 1.5 times more than the interpretation results obtained from the original conventional 3D seismic data.The characteristics of complex fracture in this area were revealed.The reliable basis was provided for accurate calculation of geological reserves and reasonable designed development program on Preowei structure.