岩溶缝洞储层地震识别及预测—以元坝地区雷四II亚段为例

Karst Reservoir Seismic Identification and Prediction—Take Lei42 of Leikoupo Formation for Example

摘要: 受印支运动影响，元坝地区雷四II亚段发育古岩溶风化壳白云岩储层，通过地震响应特征分析，明确雷四II亚段岩溶缝洞储层发育的地震响应特征为：须家河组底界面地震同相轴能量变弱，出现复波。针对岩溶缝洞储层发育特点及地震响应特征，开展了岩溶缝洞储层识别及检测的地球物理方法研究。明确多子波分解与重构技术能够识别岩溶缝洞储层的地震响应特征；相干加权能量变化属性能够有效反映雷四II亚段白云岩储层分布范围；体曲率技术能够刻画岩溶缝洞储层分布范围，并预测元坝地区雷四II亚段可能存在5个岩溶缝洞发育群，预测结果为元坝地区雷口坡组勘探提供了基础材料。

Abstract: Based on Indosinian movement, there deposited karst reservoir in Lei42 of Leikoupo Formation. Via seismic study, the karst reservoir’s seismic characteristics were determined, which were of low seismic energy and muti-wave reflection. According to geology and seismic reflection characteristic study, the seismic prediction method on karst reservoirs was developed. It concluded that seismic wavelets decomposition and reconstruction technology could recognize the karst reservoir; coherent weight energy variation attribute could predict the area of dolomite reservoirs; seismic cube curvature could illustrate the karst reservoir area. There were five weathering crust zones predicted, which provided objective basement data for exploration of Leikoupo formation.