叠前AVO反演在碳酸盐岩缝洞型储层预测中应用

摘要

Aimed at the problems of detailed prediction of the Carboniferous fractured-pit reservoirs in M-block of the Eastern Margin in Pre-Caspian Basin,to refine the Carboniferous fractured-pit reservoirs in the M-Block Carboniferous-type reservoirs on the eastern margin of the Caspian Basin,the application of AVO inversion technology based on three-dimensional prestack seismic data was conducted.This paper is focusing on rock physical analysis,verification of sensitive elastic parameters,multi-parameter comprehensive analysis.Based on the 3-D prestack seismic data,the physical model of the rock was established based on the statistical data of the actual well and the physical parameters of the rock in the work area.And find out which petro physical parameters are sensitive to the pore-type carbonate reservoirs and analyze them concretely.Based on the geological and logging data,a series of pre-stack AVO inversion techniques were used to invert the physical parameters such as longitudinal and shear wave impedance,density and Young's modulus.The inversion parameters are used to analyze the favorable distribution area and the reservoir development zone was successfully predicted by means of fracture detection technology.The result of multi-parameter analysis is consistent with that of most wells in the work area,which indicates that this method is a stable and effective prediction method for the complex carbonate reservoirs.%针对滨里海盆地东缘M区块石炭系碳酸盐岩缝洞型储层的精细预测问题,开展了基于三维叠前地震数据的AVO反演技术应用研究,重点论述了岩石物理分析、敏感弹性参数验证、多参数综合分析等关键技术环节.基于三维叠前地震资料,利用叠前地震资料对油气检测的敏感性更强的特点,以工区内的实际井统计资料为基础,结合岩石物理参数分析,建立岩石物理模型,分析孔洞型碳酸盐岩储层的流体敏感性特征.通过叠前AVO反演技术,反演出多种岩石物理参数(纵、横波阻抗、密度和杨氏模量等),进行多参数综合分析储层预测,同时借助裂缝检测技术进行论证,成功预测了储层发育带.经过实测钻井资料验证,多参数分析结果与工区内井的吻合程度很高.