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高陡复杂构造区三维地震精细刻画技术 在储气库建设中的应用
3D seismic fine description technology used for steep and complex structural areas: Its application to UGSs'construction
徐 敏1 巫芙蓉1 王兰英1 雷开强1 王 征1 司阳涛2 唐绪磊1 朱亚东1
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作者单位:1. 中国石油集团东方地球物理勘探有限责任公司西南物探研究院 2. 中国石油东方地球物理勘探有限责任公司西南物探分公司
中文关键字:地下储气库 偏移速度 断层识别 时深转换 构造轴线
英文关键字:Gas storage; Migration velocity; Fault identification; Time-depth conversion; Structural axis
中文摘要:    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。
英文摘要:    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 vel city 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.
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国内统一连续出版物号:CN51-1159/TE |国内发行代码: |国际标准出版物号:ISSN1673-3177 |国际发行代码:
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