【摘要】 针对三湖地区第四系疏松砂泥岩薄互层,着重分析了该区生物气"有储层、谁控藏"的勘探难点,并认为,在有利于岩性气藏发育的八大斜坡区寻找低饱和度岩性气藏,关键在于定量预测气藏成藏单元及其主控因素的非均质性。文中以地震资料为核心,以测井、地质、测试动态资料为约束条件,将二维地震道网格化,并通过变差函数分析、序贯指示随机模拟方法建立岩石物理三维随机模型,从而获得对含气异常较敏感的岩石物理属性体。分析该属性体产气、产水的阈值区间以建立气水识别模式,进而对岩石物理属性三维模型进行流体置换,得到网格化的气水单元分布模型及地震成藏单元,最终得到生物气藏可能的三维空间分布特征。钻探结果表明:应用地震成藏学指导下的横波岩石物理模拟技术预测天然气藏三维分布,效果明显,适用性强,其创新思路值得推广。更多还原

【Abstract】 Aimed at the Quaternarythin interbed ofloose sand and shale in Sanhu area, the exploration of biogenetic gas is analyzed. It pointed out that to quantitatively predict the gas reservoir accumulation unit and the heterogeneity of the controlling factors is the key for looking for lowsaturation lithologic gas reservoir in the eight major slope areas. Based on the seismic data, combined with logging, geology and testing data, as well as making the two-dimensional seismic data gridding, the variogram analysis and sequential indicator stochastic simulation method are applied to establish 3D petrophysical stochastic model, and the petrophysical properties body is obtained which is more sensitive togas-bearingabnormal. The most sensitive gas threshold range ofpetrophysical properties bodyis analyzed so as to build up the gas and water identification model, and carry out the fluid substitution for the 3D model of petrophysical properties. The grid cell distribution model and seismic reservoir unit are obtained and finallythe possible 3Dspatial distribution characteristics of biogenetic gas reservoir can be acquired. The drilling result shows that the S- wave petrophysical simulation method guided by seismic-petroleum accumulation science can predict the 3D distribution ofnatural gas reservoir, and good application effects are obtained.更多还原