也门S2区块叠前、叠后裂缝综合预测方法应用研究

位于也门共和国马里卜-夏布瓦盆地北部的S2区块内的火成岩断块和断背斜等构造受该区古潜山背景控制,在侏罗纪末期已经基本定型,区内圈闭的形成受持续活动的断裂的影响,断层附近伴生大量的构造裂缝。采用不同的地球物理技术预测了区内不同尺度的裂缝：联合应用蚂蚁追踪技术和本征值相干技术识别大尺度裂缝,应用基于方位各向异性的叠前地震属性预测技术识别小尺度裂缝的方向和密度。综合应用叠后、叠前地震技术进行了研究区内火成岩裂缝储层的预测,预测结果与钻井结果具有较高的一致性。

S2 exploration block is located in the north of Marib-Shabwa Basin,Yemen.The igneous rock fault blocks or faulted anticline structure controlled by the buried hill was basically fallen into a pattern in the Late Jurassic.The development of traps was affected by the continuous fault activities and a large number of structural fractures are generated near the faults.We used different geophysical methods to predict multi-scale fractures in S2 block.The combination application of ant tracking and eigenvalue coherent technique were used to identify the large-scale fractures.On this basis,the prediction of pre-stack seismic attributes based on azimuth anisotropy was used to recognize the orientation and density of small-scale fractures.We integrated post-stack and pre-stack seismic techniques to predict igneous fractured reservoirs and the predicting result was found to coincide with the drilling result.