【摘要】 苏里格地区天然气资源量丰富,勘探前景广阔,是我国油气增储上产的重要区域.研究区位于苏里格气田的西侧,该区储层段砂岩与泥岩的纵波速度、密度和纵波阻抗等常规参数相互叠置,叠后波阻抗反演难以解决该区储层预测和流体识别问题.为此,利用测井资料,开展了以地震岩石物理参数分析、弹性阻抗分析、流体替换及AVO特征分析为基础的叠前储层预测可行性研究.研究结果表明:岩石的弹性参数能够很好地区分岩性,并优选出反映储层或含气性的敏感参数,如纵横波速度比、泊松比、拉梅系数和拉梅系数/剪切模量对含气性具有良好的识别能力;不同角度的弹性阻抗既可以识别岩性,也可以区分气层和非气层;利用AVO属性可以预测盒8砂岩是否含气,但不能预测其是否具有工业价值.上述研究为该区开展地震叠前储层预测和流体识别研究提供了依据,使得该区的储层预测更具针对性.更多还原

【Abstract】 There are rich natural gas resources in SLG which is an important area for oil and gas reserve increase of China.The reservoir gas-bearing sandstone is close to wet sand and shale in density,P-wave velocity and impedance. So,it is difficult to discriminate gas-bearing sandstone from shale using general reservoir prediction methods.Based on well logging data,combined with rock physics analysis,elastic impedance analysis and AVO analysis,the studies on reservoir prediction and fluid identification in the Sulige Gasfield are carried out.The results show that the elastic parameters can be used to distinguish sandstone from shale and determine the gas-bearing sensitive parameter.Elastic impedance of different angles can be used not only to discriminate sandstone from shale,but also to distinguish gasbearing formation from non-gas-bearing formation.AVO attributes can be used to determine whether He8 formation is gas-bearing sandstone,but can not be used to predict whether it is commercial gas.These studies provide foundation for reservoir prediction and fluid identification in the study area.更多还原