Volume 63

Research on Layer-Subdivision of Artificial Edge-Water Flooding in Low-Amplitude Structural Medium-Permeability Reservoirs Jiqiang Wu, Shijun Huang, Miaomiao Liu, Wenxuan Gao, Shuang Zhang, Yang Wang

Abstract

The concept of low-amplitude structures, also known as micro-amplitude structures and micro-structures, generally refers to reservoirs with an oil-bearing height of less than 10m. Low-amplitude structures are generally likely to obtain industrial oil flows and have good exploration prospects. Artificial edge-water flooding, recently developed by Shengli Oilfield, serves as a water flooding alternative for enhancing oil recovery in complex fault-block reservoirs during the ultra-high water-cut stage. While this technology has demonstrated favorable field application results, its efficacy in low-amplitude structural reservoirs warrants further investigation. The C1 Block in Shengli Oilfield has long vertical oil-bearing well sections, multiple layered systems, and low structural amplitude. This study employs theoretical analysis, numerical simulation, and dynamic performance evaluation to examine artificial edge-water flooding in the medium-permeability, low-amplitude reservoir of the C1 Block. The findings reveal that low-amplitude structures exert significant control over the original distribution and enrichment of oil and water. A multi-factor indicator system was applied to subdivide the reservoir vertically into four distinct layer series for development. Investigations into influencing factors of the artificial edge-water flooding process have identified key directions for future reservoir management strategies.

Keywords Low-Amplitude Structures, Artificial Edge-Water Flooding, Layer-Subdivision, Multi-factor Index