Identification of Volcanic Lithology and Reservoir with Petrophsical Elastic Parameters:An Example of Yingcheng Formation in Xujiaweizi Fault Depression,North of Songliao Basin
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摘要: 徐家围子断陷火山岩岩性种类多,岩性复杂,不同岩性岩石特征差异大,火山岩岩性、储层的地震预测难度大,亟待通过岩石物理的分析,有效指导火山岩储层地震预测。通过对13种弹性参数敏感性交会分析,首次利用密度和剪切模量将徐家围子断陷营城组复杂火山岩岩性划分为玄武岩类、安山岩类和流纹岩类3类,且同一岩类岩性都具有相同的储层参数特征,在区分岩性基础上,利用密度和纵波速度双参数可对3类岩性组的储层进行直接识别,为火山岩储层叠前反演预测技术提供理论基础。Abstract: There are many kinds of volcanic rocks with complex lithological characters in the Xujiaweizi faults.As volcanic rock lithology and reservoir seismic prediction is difficult,physical anylysis is needed for effective volcanic reservoir seismic prediction.Based on the 13 kinds of elastic parameter sensitivity analysis of the intersection,we use density and shear modulus in Yingcheng Formation of Xujiaweizi fault for the first time,and classify lithologic into three categories:basalt,andesite and rhyolite.In addition,the volcanic rock in each category shows the same reservoir parameters characteristics.On the basis of lithological distinction,the use of the density and longitudinal wave velocity of fluid two-parameter group can directly identify three categories of lithologic groups,which provides theoretical base for the prediction technologies of volcanic rock reservoir prestack inversion.
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Key words:
- Xujiaweizi fault /
- volcanic /
- elastic parameter /
- sensitivity
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