分布式光纤声波传感系统在西部已开发气田井下断层活动性监测中的试验研究与应用  

Fault stability analysis and evaluation by long-term micro-seismic monitoring with distributed optical fiber acoustic sensing system in a gas field west China

作　　者：江同文 王胜军 朱松柏 王益民 邵剑波 王海应 王锦兵 姜逸明 黎颖 JIANG TongWen;WANG ShengJun;ZHU SongBai;WANG YiMin;SHAO JianBo;WANG HaiYing;WANG JinBing;JIANG YiMing;LI Ying(PetroChina Exploration and Production Company,Dongcheng District,Beijing 101000,China;PetroChina Tarim Oil Company,Korla 842209,China;Supreb Instruments Co.,Ltd.,Beijing 100190,China)

机构地区：[1]中国石油勘探与生产分公司,北京101000 [2]中国石油塔里木油田分公司,库尔勒842209 [3]北京昊锐科技有限公司,北京100190

出　　处：《地球物理学进展》2022年第5期1960-1968,共9页Progress in Geophysics

基　　金：中国石油天然气股份有限公司重大科技专项“塔里木盆地大油气田增储上产关键技术研究与应用”子课题“库车坳陷深层-超深层天然气田开发关键技术研究与应用”资助。

摘　　要：克拉2气田是塔里木盆地储量最大的整装超高压干气气藏,也是西气东输的主力气田,经过近20年的开发已进入开发中后期,23口生产井中11口井不同程度见水.为查明该气田的水侵运移通道,在一口观察井中下入高灵敏度的分布式光纤声波传感系统,长期监测井下微地震信号.本文介绍了分布式光纤传感系统的仪器选择、监测方案设计和定位算法研究等,通过对井下微地震信号的采集、降噪、滤波、识别和定位等,研究微地震事件集中发生的区域和频率,分析气田断层的活动性与水侵的关系.井下监测和数据分析结果表明,分布式光纤声波传感系统长期监测可以为断层活动性评价提供更丰富的数据,克拉2气田西南方向断层破碎带附近有大量微地震事件,断层的稳定性较差,是导致克拉2气田气井出水的主要原因之一.Kela-2 gas field is the largest integrity dry-gas reservoir with high pressure in Tarim Basin and the main gas field for West-to-East Natural Gas Transportation Project in China.After 20 years of development and production,Kela-2 gas field has entered the middle and late periods of development,with water breakthrough in 11 wells of 23 production wells.In order to find out the water passageway and water production mechanism of the gas field,a high sensitivity Distributed optical fiber Acoustic Sensing system(DAS system)was set into an observation well to monitor the downhole micro-seismic signals permanently.This paper introduces the long-term monitoring DAS system selection,the project design,and positioning algorithm design,etc.Through the micro-seismic data collection,the noise reduction and filtering for seismic data,downhole event identification and positioning,it reveals that several areas may have most micro-seismic downhole events,which is able to evaluate the stability of the faults in the gas reservoir.The practice of DAS long-term monitoring and data analysis shows that the DAS system and its data analysis can provide new solution for fault stability evaluation.The study shows the most micro-seismic events were identified near the faults and fracture zones in the southwest of Kela-2 gas field,where the faults have low stability and fault instability is one of major reasons for water production.

关 键 词：克拉2气田 分布式光纤声波传感系统 微地震监测 微地震事件 断层活动性 气井出水 

分 类 号：P631[天文地球—地质矿产勘探]