含水致密气藏特征、开发风险与有效动用对策--以苏里格气田含水区为例  

Characteristics,development risks and effective producing countermeasures of water-bearing tight gas reservoir:a case study of water-bearing area in Sulige Gasfield

作　　者：杨扬[1,2] 赖雅庭[3] 张心怡[3] 巩肖可 韩江晨 Yang Yang;Lai Yating;Zhang Xinyi;Gong Xiaoke;Han Jiangchen(China Waterborne Transport Research Institute;China University of Geosciences(Beijing);No.2 Gas Production Plant,PetroChina Changqing Oilfield Company;PetroChina Research Institute of Petroleum Exploration&Development)

机构地区：[1]交通运输部水运科学研究所 [2]中国地质大学(北京) [3]中国石油长庆油田公司第二采气厂 [4]中国石油勘探开发研究院

出　　处：《中国石油勘探》2023年第6期121-133,共13页China Petroleum Exploration

基　　金：中国石油“十四五”重大科技专项“致密气开发效果评价与开发对策研究”(2021DJ2106)。

摘　　要：苏里格气田是我国致密气成功开发的典范,随着气田开发逐渐深入,气藏产水问题逐渐凸显,气田西部、东北部及西南部属含水致密气藏,此类气藏探明储量规模达万亿立方米,规模效益开发面临较大风险。分析表明,产出地层水主体为CaCl_(2)型,以变质的古沉积水为主,可划分为自由水、毛细管水与束缚水3种类型。含水致密气藏的形成与分布受生烃强度、微构造、储层非均质性及断裂系统等因素影响,含水致密气藏主体位于低生烃强度区,局部正向微构造单元发育富气区。评价表明,含水致密气藏的开发存在地层水侵入、气井产量低、投资回收难度大、开采成本上升、安全环保及管理等多种风险。需加强以微构造为核心的甜点区预测、气水层测井解释识判、有效储层空间精细描述、直井/定向井+水平井混合式井网开发、优化排采措施与攻关低成本排采技术、产出水集中处理与安全环保预防、全过程水侵防控与风险管理等攻关研究,从而为含水致密气藏的效益动用提供有效技术支撑和对策保障。Sulige Gasfield is an example of successful tight gas development in China.However,with the progress of gas field development,the problem of water production from gas reservoir is gradually prominent.The water-bearing tight gas reservoirs are developed in the western,northeastern and southwestern parts of Sulige Gasfield,with proven gas reserves of trillions of cubic meters,and the large-scale beneficial gas development is facing great challenges.The analysis shows that the produced formation water is dominated by CaCl_(2) type and metamorphic ancient sedimentary water,which is divided into three types of free water,capillary water and bound water.The formation and distribution of water-bearing tight gas reservoirs were affected by several factors,such as gas generation intensity,micro structures,reservoir heterogeneity,and fault system,which were generally developed in areas with low gas generation intensity,while gas enrichment areas were located in local positive micro structures.The evaluation results indicate that are multiple risks in the development of water-bearing tight gas reservoirs,including formation water intrusion,low gas rate of single well,low economic returns,high production cost,and HSE and management.As a result,a series of researches should be strengthened,such as sweet spot area prediction in micro structures,gas/water layer logging interpretation and identification,fine description of effective reservoir space,mixed development well pattern of vertical/deviated well+horizontal well,production measures optimization and low-cost production technology,centralized treatment of produced water and prevention of safety and environmental protection issues,and whole-process water intrusion prevention and control and risk management,so as to realize the successful development of water-bearing tight gas reservoirs.

关 键 词：含水致密气藏 苏里格气田 主控因素 开发风险 动用对策 

分 类 号：TE37[石油与天然气工程—油气田开发工程]