摘要
建设地下储气库的意义在于随时调节供应量和消费量间的平衡、协调供求关系的变化和战略储备。川东XGS储气库是西南地区首座大型地下储气库,建设中面临着构造高陡、狭窄、断裂系统发育、陡倾角准确入靶困难的问题。将高陡复杂构造区三维高精度地震处理解释技术引入储气库建设可以稳当地解决这些问题。结果表明:①根据钻井位置及构造形态加密速度控制点建立偏移速度场,可使偏移归位更准确,断点位置清晰,解释的构造形态更合理;②对储气井进行精细层位标定,采用钻井地质恢复技术可建立准确的构造模式;③采用变速成图技术优化时深转换速度模型,可使构造轴线更加接近地下真实位置,地震预测深度与实钻深度的绝对误差仅0~8 m。结论认为:三维地震精细刻画技术可以全方位对地下构造形态进行刻画,为下一步该储气库注采井的井位论证及实施提供精准指导。
To construct underground gas storages(UGSs)mainly aims to adjust supply-consumption balance at any time,coordinate some change of supply-demand relationship,and provide strategic reserves.For XGS gas storage in eastern Sichuan Basin,the first large-sized one in Southwest China,the construction was up against a series of problems,for example,steep and narrow structure with developed fractures,and difficultly accurate targeting at high dip angle.And these problems could be solved smoothly by 3D high-precision seismic processing and interpretation technology used for steep and complex structural areas.Results show that,(1)establishing migration velocity field via infilling velocity control points according to drilling position and structural form can make the migration and homing more accurate,the breakpoint position clear,and the interpreted structural form more reasonable;(2)based on fine horizon calibration of gas-storage wells,an accurate structural mode can be developed by drilling geological recovery technology;and(3)by optimizing the time-depth conversion velocity model through variable speed mapping technology,structural axis can be reflected more truly,and an absolute error between seismic predicted depth and actual drilling depth is only 0-8 m.In conclusion,this 3D seismic fine description technology can describe the form of underground structure comprehensively,and provide accurate guidance for well-location demonstration and implementation of gas-storage wells in the next step.
作者
徐敏
巫芙蓉
王兰英
雷开强
王征
司阳涛
唐绪磊
朱亚东
Xu Min;Wu Furong;Wang Lanying;Lei Kaiqiang;Wang Zheng;Si Yangtao;Tang Xulei;Zhu Yadong(Southwest Geophysical Research Institute,CNPC BGP Inc.,Chengdu,Sichuan 610213,China;Southwest Geophysical Company,CNPC BGP Inc.,CNPC,Chengdu,Sichuan 610213,China)
出处
《天然气勘探与开发》
2020年第4期54-61,共8页
Natural Gas Exploration and Development
关键词
地下储气库
偏移速度
断层识别
时深转换
构造轴线
Gas storage
Migration velocity
Fault identification
Time-depth conversion
Structural axis
