复杂断块油藏水驱储量控制程度评价新方法

doi:10.13809/j.cnki.cn32-1825/te.2023.02.008

摘要/Abstract

摘要：

复杂断块油藏纵向上油层多，平面上油砂体发育面积小，平面非均质性强，难以构建规则井网均匀驱替，同时受储层各种封闭边界影响，水驱过程中易形成死油区，为了更加精准计算水驱储量控制程度，更好地评价油藏的井网合理性与完整性，找出井网调整和加密潜力，针对常规方法的不足，提出了更加适用的新方法，即网格储量法。通过提高平面上井网内储量控制面积的划分精度，结合储层地质条件及储层非均质差异，以注采井组为基本单元，逐层网格化井网控制地质储量，对网格化的地质储量进行分类统计，找出复杂边界造成的死油区，进而计算区块注采井网控制程度、水驱储量控制程度，最终得到井网调整加密潜力。将该方法应用在南堡101断块井网适应性评价中，找到了复杂边界造成的井网未控制未动用区域，通过加密调整取得较好的挖潜效果，证明该方法在复杂断块油藏水驱储量控制程度评价有较好的适应性，可以推广至其他复杂断块油藏。

关键词: 复杂断块油藏, 注采井网控制程度, 水驱控制程度, 井组网格化, 水驱潜力, 边界效应

Abstract:

There are many oil layers in the vertical direction of complex fault block reservoirs. The development area of oil sand bodies on the plane is small, and the plane heterogeneity is strong. It is difficult to construct a regular well pattern for uniform displacement. At the same time, due to the influence of various closed boundaries of reservoirs, bypassed oil area is easy to form in the process of water flooding. In order to calculate the control degree of water drive reserves more accurately, evaluate the rationality and integrity of reservoir well pattern better, and find the way to adjust the well pattern, a more suitable new method, namely grid reserve method, is proposed for the shortcomings of traditional methods. By improving the division accuracy of the reserve control area in the well pattern on the plane, combining the geological conditions and the heterogeneity difference of the reservoir, and taking the injection-production well group as the basic unit, the geological reserves are controlled by the well pattern gridded layer by layer. The grid geological reserves are classified and counted, and those bypassed oil areas are found out, and then the control degree of the injection-production well pattern and the control degree of the water drive reserves are calculated. Finally, the potential of well pattern adjustment and encryption is obtained. This method is applied to the adaptability evaluation of the well pattern in Nanpu-101 fault block, and the uncontrolled and unused area of well pattern caused by complex boundary is found. After well pattern infilling, better potential tapping effect is show in this area. It is proved that this method has good adaptability in the evaluation of water drive reserves control degree in complex fault block reservoirs, and can be extended to other complex fault block reservoirs.

Key words: complex fault block reservoir, control degree of injection-production well pattern, water drive control degree, gridding of well pattern, water drive potential, boundary effect

中图分类号:

TE357

张杰,曾诚,李彦泽,李明林,骆洪梅,李晶华. 复杂断块油藏水驱储量控制程度评价新方法[J]. 油气藏评价与开发, 2023, 13(2): 200-205.

ZHANG Jie,ZENG Cheng,LI Yanze,LI Minglin,LUO Hongmei,LI Jinghua. New evaluation method of water flooding reserve control degree in complex fault block reservoirs[J]. Reservoir Evaluation and Development, 2023, 13(2): 200-205.

图/表 5

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