高含水期油藏精细数值模拟研究

传统的油藏数值模拟方法由于没有考虑高含水期油藏开发过程中储层岩石和流体参数的变化,常导致模拟结果的失真。为此对传统方法进行了改进。选用Eclipse数值模拟软件中的黑油模型,应用分阶段油藏数值模方法及垂直平分(PEBI)网格划分技术对胜坨油田二区沙二段第3砂层组进行了高含水期油藏数值模拟。结果表明,分阶段建立地质模型和流体模型,其模拟结果更符合油田开发实际情况。采用PEBI网格划分技术精确描述断层、砂岩尖灭、不规则边界等复杂地质现象,可提高数值模拟的精度。在不同开发阶段油藏剩余油分布受不同因素的控制,在弹性开发阶段,油藏剩余油主要受储层物性的差异性以及井网方式所控制;而在水驱稳产开发阶段,注入水对储层物性的改造及对高含水期剩余油分布起到较大的控制作用。

Fine numerical simulation of the reservoir at high water cut period

The normal simulation results for the high water cut reservoir may deviate from its real situations, because of no considering the reservoir rock and fluid parameters variation during its development. The improved method was put forward. With the black oil model in Eclipse software, the method of multi-stages simulation and perpendicular bisector (PEBI) girding technique, the layer of 3~(rd) in the second member of Shahejie formation in the second district of Shengtuo Oilfield with high water cut was investigated by reservoir numerical simulation. The study results show that simulation results by the improved method are accordance with the actual development situations. The complicated geological phenomenon including faults, sandstone pinch and abnormal boundary could be exactly described by PEBI girding technique and the accuracy of simulation result was improved. The residual oil distribution was dominated by different factors in every stage. During the elastic development stage, the residual oil distribution is dominated by the reservoir properties discrepancy and well pattern. While during water flooding stage, the residual oil distribution is dominated by the injected water which alters the reservoir properties.