平湖油气田P1气藏剩余气分布方向初探

平湖油气田经过近二十年的开采,目前已经步入开发后期。P1气藏作为平湖油气田曾经的主力产气层,由于生产井相继出水,且出水迅猛,导致三口生产井相继水淹关井。开发生产动态综合分析认为,P1气藏虽然开发井水淹,但气藏仍存在一部分剩余气。若将这部分潜力找到并有效动用,对于缓解平湖油气田生产形势有非常积极的作用。文章主要从地震、地质和油藏动态等多方面资料对P1气藏的出水来源和方向进行分析,认为P1气藏出水主要来源于放二断层开启,引入花港组地层水,大量出水使气藏中形成"水道",致使北部B6井区还存在一定剩余气分布。

Preliminary Study on the Direction of Remaining Gas Distribution in P1 Gas Reservoir in Pinghu oil and Gas Field

After nearly twenty years of exploitation, Pinghu oil and gas field has already entered the late stage of development. As the main gas-producing layer of Pinghu oil and gas field,wells of the P1 gas reservoir have been flooded and shut because of the rapid water flow rate. According to the comprehensive analysis of development and production dynamics, although the development wells are flooded in the P1 gas reservoir, there is still some remaining gas in the gas reservoir. If the potential is found and effectively used, it will have a very positive effect on mitigating the production situation of Pinghu oil and gas field. The article mainly analyzes the source and direction of the effluent of the P1 gas reservoir from various aspects such as earthquakes, geology, and reservoir dynamics. According to the analysis, the water in the P1 gas reservoir is mainly derived from Huagang formation of F2 fault. A large amount of water makes the formation of "waterways" in the gas reservoir, and the residual gas still exists in the B6 well area.