苏里格气田相控建模及有利储层预测

Fades Controlling Modeling of Sulige Gas Field and Prediction for Favorable Reservoirs

苏里格气田含气面积几千平方千米,储层性质变化大,生产动态反映沉积微相明显控制有利储层的分布。通过研究该区古河流的几何形态参数,采用相控建模技术对苏里格地区储层进行预测。建模过程中优选砂体宽厚比参数在45-80范围内变化,河道的主方向在-10°-20°范围内变化,其中盒8下亚段的底部河道的弯曲度小,盒8下亚段的顶部河道的弯曲度较大,砂体的剖面几何形态为半圆柱体。在随机建模过程中考虑砂岩密度、各种厚度砂体比例、旋回性、砂体宽厚比、高效储层空间位置等地质参数为随机地质模型的约束控制条件。相控建模的结果反映出有利储层的分布,并与生产动态相吻合。

Sulige Gas Field has a gas-bearing area of thousands of square kilometers. With large variations in borehole diameter and reservoir properties, the dynamic production state shows that the sedimentary microfacies apparently controls distribution of favorable reservoirs. The study is made on the geometric parameters of the ancient rivers in this region and the facies controlling modeling technology is used to predict the reservoirs in Sulige region. In the modeling process, the selected width-thickness ratio of sand body ranges between 45-80 while the main direction of channel ranges in the -10°-20° scope. In the random modeling process, a number of geological parameters such as sandstone density, the proportion of sand bodies of various thickness, cyclicity, the width and thickness ratio of sand body and the position of effective reservoir space are considered as the restricting and controlling conditions for the random geological model. The results of facies controlling modeling reflect distribution of favorable reservoirs and are in line with the dynamic production state.