井中微地震逆时干涉震源定位在风城重油油田SAGD快速预热中的应用  

Application of Time Reversed Imaging in Downhole Microseismic Monitoring for Fast SAGD Start-Up Enhancement of Heavy Oil Reservoir in Fengcheng Oil Field

作　　者：李萌 杨若姣[3] 刘斌 魏晨华 LI Meng;YANG Ruojiao;LIU Bin;WEI Chenhua(School of Earth Sciences and Engineering,Xi’an Shiyou University,Xi’an 710065,Shaanxi,China;Shaanxi Key Lab of Petroleum Accumulation Geology,Xi’an Shiyou University,Xi’an 710065,Shaanxi,China;PetroChina Xinjiang Oilfield Branch Company,Karamay 834000,Xinjiang,China;Xi’an Changqing Technology Engineering Co.,Ltd,Xi’an 710021,Shaanxi,China;Karamay Vocational&Technical College,Karamay 834000,Xinjiang,China)

机构地区：[1]西安石油大学地球科学与工程学院,陕西西安710065 [2]西安石油大学陕西省油气成藏地质学重点实验室,陕西西安710065 [3]中国石油新疆油田公司,新疆克拉玛依834000 [4]长庆工程设计有限公司,陕西西安710021 [5]克拉玛依职业技术学院,新疆克拉玛依834000

出　　处：《西北地质》2023年第5期111-119,共9页Northwestern Geology

基　　金：陕西省自然科学基础研究计划面上资助项目(2023-JC-YB-220)资助。

摘　　要：蒸汽辅助重力泄油(SAGD)快速预热技术利用短时间的注入高压蒸汽在生产井和注入井之间形成一个高孔隙度和高渗透率的扩容蒸汽腔,其几何形态与扩展规律可由微地震技术进行监测和描述。笔者选取风城重油油田的一组SAGD快速预热注入与生产井组进行井下微地震监测,采用三维弹性波逆时干涉震源定位算法获取弱微地震事件的空间分布,定量计算高温蒸汽注入期间形成蒸汽腔体的长度、宽度、高度、方位和扩容体积,对蒸汽腔体几何形态和震级能量分布的动态变化进行分析,探讨蒸汽腔前缘在深度上针对非均质性夹层的延伸趋势与形态。研究结果表明,注入井与生产井之间已经联通,且扩容区域已部分延伸至油层底界面。此外,注入井上方储层产生了较多的微地震事件,表明本次施工已击破注入井上方的非均质物性夹层,完成了注入井上方储层改造的任务。Fast SAGD start−up enhancement technique injects the high−pressure steam in short time to build a high−temperature steam chamber with high porosity and permeability.In this study,downhole microseismic monitoring was performed in a fast SAGD start−up enhancement well group of heavy oil reservoir in Fengcheng oil field to delineate the geometric and dynamic propagation characteristics of formed steam chamber.Time reversed imaging method was applied to obtain the weak event locations with high accuracy.The quantitative estimation of length,width,height,azimuth and volume of the steam chamber was also estimated based on the event locations. The variation of steam chamber geometric and energy distribution with dates were also analyzed. The propagation characteristics of steam chamber front in depth direction respect to heterogeneous interlayer was al-so studied. The microseismic monitoring results demonstrates that the injection well and production well has been connected and the expansion area has partially extended to the bottom of the oil layer interface. In addition, amount of microseismic events were found above the injection well which suggests the steam has break the het-erogeneous interlayer. Therefore, the reservoir has been successfully stimulated. Finally, the fitting relationship between steam chamber geometry characteristics and injection dates has been obtained based on the microseis-mic monitoring results, which provides significantly theoretical and practical foundation for the design and opti-mization of fast SAGD start−up enhancement in the studied area.

关 键 词：井中微地震监测 逆时干涉震源定位 SAGD快速预热 风城油田 蒸汽腔 

分 类 号：P631.4[天文地球—地质矿产勘探]