致密砂岩气储层的岩石物理模型研究

根据鄂尔多斯盆地苏里格气田以往实测和新测的共17口井51块岩样超声波实验数据,得到304组不同孔隙度和不同含水饱和度下对应的纵横波速度、泊松比等弹性参数.重新优选计算体积模量和泊松比与含气饱和度的关系,表明苏里格气田上古生界二叠系石盒子组盒8致密砂岩储层的模型与Brie模型(e=2)相似度最高.由此建立的苏里格气田储层岩石物理模型,更好的表征了致密岩石储层物理参数随含气饱和度变化规律,为该区储层预测提供了理论依据.致密储层岩石物理模型研究成果应用于苏里格气田多波地震资料气水预测中,实际例子表明该模型适用于该区的储层和含气性预测,并取得了较好的效果.

Study on the rock physics model of gas reservoirs in tight sandstone

According to the ultrasonic data of 51 measured core samples from 17 wells in the Sulige gas field, 304 groups of elastic parameters data including V_P/V_S and Poisson's ratio were obtained corresponding to different porosities and water saturations. The optimized rock physics corrections among the bulk modulus and Poisson's ratio, and gas saturation indicate that the Brie model (e=2) can fairly characterize the properties of upper Paleozoic Permian H8 reservoirs in the Sulige gas field. Therefore, the proposed rock physics model is able to estimate the physical parameters variation of tight sandstone reservoirs with gas-bearing saturation level. The proposed rock physics model is applied to predict gas-water reservoirs by utilizing multi-wave seismic data of the Sulige gas field. The field test indicates that this model is capable of characterizing attributes of the target zone and predicting the gas-bearing reservoir.