中央背斜带地层水离子浓度和水型分布规律及影响因素探讨

Discussion on Distribution Law and Influencing Factors of Ion Concentration and Types of Formation Water in Central Anticline Zone of Xihu Sag

中央背斜带已投入开发气田有6个,跟踪气田开发动态及水化验分析资料发现,各生产井产出水氯离子浓度及水型存在明显区域分带差异,导致生产井生产特征差异明显。笔者尝试分析各气井产出水的化学特征及各离子组成,结合各气井的生产史、埋藏深度、成藏机理和构造运动等,分析水型变化原因,探讨影响水型分布规律和产水特征的因素,对于背斜带各油气田稳定开发、合理开发技术政策制定具有重要的参考意义,也为将来类似气田开发方案编制、气田高效开发提供借鉴。

Six gas fields have been put into development in Central Anticline Zone.According to the development performance of gas fields and water analysis data,it is found that there are obvious regional differences in chloride ion concentration and water types in the produced water of each production well,resulting in obvious differences in production characteristics of production wells.The author tries to analyze the chemical characteristics and ion composition of the produced water of each gas well.Combined with the production history,burial depth,reservoir forming mechanism and tectonic movement of each gas well,the reasons for the change of water types are analyzed,and the factors influencing the distribution law of water types and water production characteristics are discussed.It provides important reference significance for the stable development of each oil and gas field in Central Anticline Zone and the formulation of reasonable development technology policies.It also provides reference for the preparation of development plans in similar gas fields and efficient development of gas fields.