盒8地层岩石物理参数及地震响应模型研究

鄂尔多斯盆地盒8砂岩储层横向变化大，非均质性强，局部含水，含气砂岩的密度、速度和阻抗与泥岩相近，因此用常规储层预测方法区分含气砂岩与泥岩、含气砂岩与含水砂岩难度较大。通过测井曲线重构，建立了盒8地层岩石物理参数及其地震响应模型。结果表明，含水饱和度模型能够区分含气砂岩和含水砂岩；泥质含量模型能够分辨砂岩和泥岩；孔隙度模型能够分辨致密砂岩和孔隙砂岩。孔隙度合成道集和全叠加地震响应明显，高孔隙度砂岩表现为强振幅特征。所建立的岩石物理参数模型可直接用于高孔隙度含气砂岩的识别，确定的模型参数可直接用于实际资料处理，对提高有效储层的识别精度和可靠性具有指导意义。

Research on petrophysical parameters and seismic response models of He 8 formation

He 8 sandstone reservoir in Ordos Basin is characterized by quick lateral variations, strong heterogeneity and containing water in part. The gas bearing ,sand is close to shale in density, velocity and impedance. The results show that it is difficult to divide gas-bearing sand from shale, and gas from wet sand using general reservoir forecasting methods. The petrophysical parameters and seismic response models of He 8 formation were created by rebuilding the well logs. The resuits show that it is distinguishable between gas and wet sand from the saturation model, sand and shale from the shale content model, tight and porous sand from the porosity model. The seismic response to porosity synthetic gathers and full stack is evident, and high porosity sand presents strong amplitude. It can be used to identify high porosity gas charged sands from the petrophysical parameter models. The model parameters can be applied in actual seismic inversion directly, and it will provide instruction to improve accuracy and reliability for effective reservoir prediction.