关键词: 开发老区, “水区”, 对比分析, 圈闭分析, 储量发现

Abstract: Compared with the "dry belts", the reservoirs of the "water areas" in developed old blocks have good physical properties and high liquid-producing capacity and discovering oil layers for production can receive good benefits. In order to find the oil layers in the "water areas", based on the introduction of searching for the lost hydrocarbon reservoirs within the oil producing regions, the "water area" expanding edges around the oil producing regions, and the "blank interval" "black zone" "blank trap" looking for the oil layers to find oil and gas geologic reserves in the "water areas", this paper explored the search for "water area" oil layers within the oil producing regions through pathways such as plane analysis, longitudinal contrast, improving the interpretation charts, correcting the structure and subdividing the subzones. By analyzing the main control factors of forming reservoirs and the oil-water interface in the peripheral "water areas" of the oil producing regions, the edge expansion of oil layers can be achieved.In blank intervals, blank zones and blank traps, the feasible technical methods for exploring oil in the "water areas" of developed old blocks include the analysis of hydrocarbon accumulation rule, microstructure analysis, analogous analysis of traps and prolonged drilling. It is proved by oil testing that the above interpretation and evaluation methods have good application effects, and can provide clues for searching for oil and gas geologic reserves in the "water areas" of developed old blocks.

Key words: developed old block, "water area", contrastive analysis, trap analysis, reserve discovery