叠前反演预测火山岩储层——以莺山-双城断陷为例
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摘要
火山岩构造变位较为强烈,岩性复杂,岩相变化快,储层非均质性强,储层分布影响因素较多,造成火山岩储层预测比较困难.本文分析莺山地区火山岩岩石物理特征,优选火山岩岩性、储层敏感弹性参数,认为储层主要发育在流纹岩和安山岩中.根据叠前AVO同步反演预测结果划分有利储层分布范围,考虑次级断裂及火山机构、火山岩相带等因素对储层分布的影响,得出了研究区储层有利区综合平面分布范围.将反演预测结果与已有钻井进行对比分析,验证反演结果.研究表明,通过地震属性分析及叠前AVO同步反演能有效地预测火山岩储层,为储层评价和井位建议提出可靠依据,应用效果良好.
The volcano rock is usually located in the area which has experienced intense tectonic movement,led to complex lithology,diversification of lithofacies,reservoir heterogeneity seriously and so on.Due to above reasons,volcanic reservoir distribution is easy to be affected and is difficult to predict.This article argues that reservoirs are mainly developed in rhyolite and andesite by analyzing physical characteristics of volcano rock in Yingshan area and preferring reservoir sensitivity elastic parameters.In addition,favorable reservoir distribution division is concluded by prestack simultaneous AVO inversion.And then the favorable reservoir zone map is got with considering secondary fracture mechanism,volcano facies belt and other factors.The inversion predicted results are compared with existing drilling to test the effectiveness of inversion.Results indicate that the prediction of volcanic reservoir could be accurate through seismic attribute analysis and prestack simultaneous AVO inversion,which ensure the accuracy of reservoir evaluation and well drilling plan.
引文
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