论文详情
琼东南盆地深水区松南宝岛凹陷晚中新世受区域张扭应力影响,发育NWW向走滑断裂带,断裂发育复杂,规模差异大,常规相干切片难以准确识别断裂的平面连接关系和延展情况,因而降低了资料的解释效率和准确度,影响了圈闭刻画和油气运聚规律研究。针对研究区断裂特征,基于构造滤波、构造平滑、频谱分解和RGB融合的单一技术优势,采用叠后地震分频倾角相干融合技术刻画断裂特征及展布规律,指导断裂解释。应用结果表明:基于保留断裂构造滤波和平滑处理的分频倾角相干融合技术,能够有效去除地震数据体中的随机噪声,提高断裂的分辨能力,弄清断裂的平面连接关系和延展情况,提高复杂断裂精细解释的效率和准确性,为勘探阶段构造精细解释提供一种识别多尺度断裂的有效方法。
The NWW strike-slip fault zone was formed during the late Miocene in the Songnan-Baodao Sag,in the deep waters of the Qiongdongnan basin,under the influence of regional tension-torsional stress.The fracture system is complex,and the scale of the different faults varies greatly.The conventional coherent slice method is unable to accurately identify the planar connection and extensibility of faults,thereby affecting the characterization of traps and the evaluations of patterns of hydrocarbon migration and accumulation.In this study,a frequency-divided dip coherent fusion technique based on structure filtering and smoothing was proposed.The structural filtering and structural smoothing were used to reduce the noise of post-stack seismic data.A decomposition spectrum was obtained from spectrum analysis of the target layer.The 40 Hz,50 Hz,and 60 Hz frequency-divided dip angle coherences were selected for RGB fusion to improve the fracture recognition and guide the interpretation.Results on actual data showed that the technique can effectively remove the random noise in the seismic data volume,significantly enhance the resolution of the fractures,improve the plane connection relationship and extensibility of the fractures,and improve the efficiency and accuracy of the fine interpretation of complex fractures.The proposed method provides a reference to identify multiple-scale faults to achieve fine structural interpretation.
国家科技重大专项“海洋深水区油气勘探关键技术”(2016ZX05026-007)资助。