【摘要】 针对碳酸盐岩裂缝-孔洞型储层的有效预测,研究并提出了井震结合的地震多属性融合缝洞体系综合预测方法。该方法首先采用叠后地震资料的峰值频率振幅属性对储层的孔洞分布特征进行预测,然后利用成像测井获得的储层段裂缝平均孔隙度与倾角、曲率、方差等叠后地震属性预测的大尺度裂缝分布结果进行交会,分别确定出这些属性的有效范围,再将有效范围内的几种属性值进行融合得到叠后大尺度裂缝分布特征;基于叠前分方位CRP道集计算频率梯度属性进行小尺度裂缝预测,并将预测结果与成像测井裂缝孔隙度进行交会得到小尺度裂缝分布;最终将孔洞、大裂缝和小裂缝3种预测结果融合,得到缝洞体系综合预测成果。对我国西部T油田H区块碳酸盐岩储层缝洞体系预测的实际应用结果表明,所论缝洞体系综合预测方法相较于常规方法能够更好地实现碳酸盐岩储层缝洞体系的有效预测,提高勘探预测精度。更多还原

【Abstract】 Aimed to the prediction of fracture-vuggy type carbonate reservoir,we propose a comprehensive prediction method of fracture-cavern system by multiple seismic attributes through the combination of logging and seismic.We use the poststack seismic attribute of amplitude envelope on peak frequency to analyze the distribution characteristics of reservoir’s cave.After that,we cross plot the fracture porosity extracted from image logging with large-scale fracture distribution results predicted by several poststack seismic attributes,such as dip,variance and curvature attributes,thus the valid range of these attributes are determined respectively.The large-scale fracture distribution is obtained from the combination of several poststack attribute values in valid range.Furthermore,the frequency gradient is calculated in prestack azimuthal CRP gathers,and then the micro-scale fracture is obtained by cross plotting the fracture porosity of imaging logging with the predicted results from frequency gradient attribute.Finally,integrating the predicted results of cavern,largescale and micro-scale fractures,we could get the comprehensive prediction of the distribution of fracture-cavern system in reservoir.In this paper,we employ this method to predict fracture-vuggy system of carbonate reservoir for T oilfield in western China.Compared with conventional methods,the prediction of fracture-cavern system of carbonate reservoir is realized with enhanced prospecting accuracy.更多还原