发明授权
US06727706B2 Virtual steering of induction tool for determination of formation dip angle
有权
用于确定地层倾角的感应工具的虚拟转向
- 专利标题: Virtual steering of induction tool for determination of formation dip angle
- 专利标题(中): 用于确定地层倾角的感应工具的虚拟转向
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申请号: US09925997申请日: 2001-08-09
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公开(公告)号: US06727706B2公开(公告)日: 2004-04-27
- 发明人: Li Gao , Stanley C. Gianzero
- 申请人: Li Gao , Stanley C. Gianzero
- 主分类号: G01V318
- IPC分类号: G01V318
摘要:
A method is disclosed for using a triad induction tool to identify the formation strike and dip angles. The method can be performed in real time. In one embodiment, the method includes: (1) measuring a magnetic coupling between transmitter coils and receiver coils of a tool in the borehole; (2) obtaining from the measured coupling a strike angle between the tool and the formation; (3) applying a rotational transformation to the coupling measurements to correct for the strike angle; and (4) applying a predetermined set of rotational transformations to the coupling to determine coupling term values as a function of rotation angle. A least-squares curve fit or a Hough transform of the derivative of the coupling term values with respect to position may be used to identify the dip angle.
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