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

Abstract

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

CLC Number:

TE357

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

Figures/Tables 5

References 23

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