摘要
时移地震可以指导进入开发中后期的油气田进行二次开发和调整挖潜,以提高油气田采收率,增加经济效益。但是,时移地震监测结果的不确定性和高投入使监测采集具有高风险性。因此,在油气田实施时移地震监测采集前,须对其采集时机可行性进行系统分析和评价。以南海L气田为例,基于油藏数值模拟结果,利用岩石物理模型将气藏开发过程中的流体及孔隙压力变化转换成声学参数变化,并通过地震正演模拟得到气藏开发过程中各个时间点的理论合成地震响应。从气藏动态数据递减趋势规律分析、时移地震响应变化规律分析以及信噪比影响分析3个方面对L气田时移地震采集时机可行性问题进行了研究。结果表明,L气田最佳的时移地震采集时机应在2022年前后。研究结果为指导L气田进行更有效的时移地震采集提供了重要依据。
Time-lapse seismic acquisition can guide the secondary development of oil and gas fields in the middle and late stages of development,to improve recovery efficiency and increase economic benefits.However,the uncertainty of time-lapse seismic results and the high investment required pose high risks.Therefore,before performing time-lapse seismic monitoring,its feasibility should be systematically analyzed and evaluated.Herein,the L gas field in the South China Sea was taken as a case study.Based on the reservoir numerical simulation results,the fluid and pore pressure changes during development were converted into acoustic parameters using the petrophysics model and the theoretical synthetic seismic response at each time point during the development process was obtained via seismic forward modeling.Then,the feasibility of time-lapse seismic acquisition was evaluated with respect to three aspects:dynamic data variation,time-lapse seismic response variation,and signal-to-noise ratio.The results showed that the year 2022 should be the best period for time-lapse seismic acquisition of the L gas field.The results of this research constitute an important basis for guiding time-lapse seismic acquisition in the L gas field.
作者
刘巍
邓海东
张亮
黄旭日
李法律
陈小春
LIU Wei;DENG Haidong;ZHANG Liang;HUANG Xuri;LI Falv;CHEN Xiaochun(Hainan Branch of CNOOC Ltd.,Haikou 570100,China;School of Geoscience and Technology,Southwest Petroleum University,Chengdu 610500,China)
出处
《石油物探》
CSCD
北大核心
2022年第3期490-498,共9页
Geophysical Prospecting For Petroleum
基金
中海石油(中国)有限公司科研项目(ZYKY-2019-ZJ-01)资助。
关键词
采收率
时移地震
油藏数值模拟
岩石物理模型
采集时机
recovery efficiency
time-lapse seismic
reservoir numerical simulation
petrophysical model
acquisition timing
