蜀南南井气田井2缝洞系统气水关系研究

蜀南南井构造茅口组气藏为典型的碳酸盐岩缝洞气藏,基质致密,溶洞是主要的储集空间,而裂缝是主要的渗流通道。该气藏已经进入开发中后期,气藏大规模见水。为解决该气藏大量剩余储量未能动用、气藏采出程度偏低的问题,本文试在气藏地质特征和开发动态特征相结合的基础上,结合其他相关技术和手段,对气藏驱动能量、气水关系等进行细致分析,认为缝洞系统内气水关系复杂,可能不存在统一的气水界面。隔气式气驱是气藏产水的主要驱动力,水体自身能量有限。

Study on the realationship of water-Gas in the Jing2 vuggy -fractrue system in Nanjing gasfild,the south of Sichuan basin

Gas reservoir of Maokou in Nanjing is a typical vuggy-fracture Carbonate reservoir with low matrix porosity and low permeability.In the area cave is the main reservoir space, while the fracture is the main permeable channel.Currently,the gas reservoir development has been in the middle-last development time,the scale of water breakthrough is large.In order to solve the problem that a lot of remaining reserves of gas reservoir with water in Nanjing can not be produced and low gas reservoir recovery,based on the combination of reservoir geological characteristics and dynamic characteristics of the development,combined with other related technologies and tools,to have a comprehensive analysis of the relationship of gas-water and the main drive force of producing water.And we get that in the fractured-vuggy system the realationship is very complex,and maybe there isn’t a uniform interface of gas -water.Gas drive is the main driving force of water production in gas reservoir,the energy of the water body itself is limited.