拟时移地震气藏剩余潜力研究

Reminding gas potential study based on quasi time-lapse seismic

时移地震是一种有效的油气藏监测技术,但高投入和高风险造成目前时移地震资料缺乏。由于不同年度采集、处理参数不同,地震资料存在非一致性问题,不能有效开展剩余潜力研究。为此,选择了处于开发后期的南海Y气田,通过对2001年二维和2015年三维地震资料优选和优化,形成拟时移地震资料;再应用拟时移地震资料识别气水关系、划分气藏水侵模式,并利用分频能量属性,结合气田生产数据模拟气藏动态,明确了气藏剩余潜力区。研究结果表明,当前Y气田西北区域隔层为高渗滤型和渗滤型,气藏处于强水侵状态,剩余潜力有限;东南区域隔层为非渗透型,气藏处于水侵初期,剩余潜力大,可作为下一步挖潜目标区。拟时移地震的应用证明了其可作为当前时移地震研究的补充部分发挥重要作用。

As a hydrocarbon reservoir monitoring approach,the time-lapse seismic is not widely used due to its high cost and high risks and time-lapse seismic data is not enough for reminding resource potential study.Therefore we conduct a reminding gas potential study based on quasi time-lapse seismic data.We use 2 D seismic data(surveyed in2001)as basic data and 3 Dseismic data(surveyed in 2015)as monitoring data in a later-stage gasfield,South China Sea.We analyze the relationship between water and gas and predict water invasion mode on the quasi time-lapse seismic data.According to frequency-segmented attributes and production information,we build a dynamic reservoir model,and then obtain reminding gas potential.Based on our study,as high and medium permeability barriers,the northwest part of the gas-field has limited reminding potential due to strong water approaching;while the southeast part has great reminding potential with argillaceous and stable barrier,which is a favourable zone for the later deployment.Our application proves that the proposed quasi time-lapse seismic might play an important role in the reminding resource potential study.