关键词: 油藏数值模拟, 随机建模, 连通原油体积, 流体流动, 静态地质参数, 排序指标

Abstract:

Reservoir stochastic modeling can produce a large number of realizations with modern modeling software. However, the flow simulation of all the realizations is challenging because of computational costs associated with the multiple detailed flow simulations. Only a limited number of realizations are often selected for the flow simulation. Selecting the first realization or randomly selecting them may lead to unusual low or high results and cannot permit an assessment of uncertainty. Ranking realizations according to some simple geological measures and then selecting some typical ones are good way for solving this problem. The simple measures should be highly correlated to the flow response variables of interest. Connected hydrocarbon volume in place (CHV) is a kind of such measure and has been applied in some study cases.  A new static ranking measure was proposed on the basis of CHV. In this measure, the calculation formula for connected hydrocarbon volume includes two affecting factors such as the distance from each cell to the nearest connected production well and the geometric average of permeability from the cell to the nearest production well in the shortest path. The two factors were investigated by the study case. The new measure shows the difference of different realizations.

Key words: reservoir numerical simulation, stochastic modeling, connected hydrocarbon volume, flow fluid, static geological parameter, ranking factor