An improved structure of coplanar coil system and its logging response

The logging response calculation and fast inversion are the key and difficulties for logging data interpretation and formation parameter estimation of the triaxial array induction logging. We transform the formation conductivity from media coordinate to instrument coordinate based on coordinate transformation theory. This paper examines anisotropic response of the triaxial array induction in inclined anisotropic formation by finite element method. The greater the anisotropy coefficient is, the more obvious the curve separation. The apparent conductivity decreases with the increase of dip angle for the coaxial system, but the coplanar system increases. The research results show that the apparent conductivity of the coplanar system appears as obviously positive and negative horns on the horizontal interfaces, which is generated by the accumulated surface charge at the boundary of the layer.

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Research on triaxial array induction logging response in inclined anisotropic formation

Zhang

Liu

2020

J. Phys.: Conf. Ser.

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A novel coplanar system with a minimal anisotropic effect

Zhang

Liu

2020

IOP Conf. Ser.: Mater. Sci. Eng.

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To obtain the response of the novel coplanar system, we use an analytic method to solve horizontal component of electromagnetic field in the anisotropic stratigraphic model by introducing the magnetic Hertz vector and the magnetic Hertz scalar from Maxwell equations. This paper examines anisotropic response characteristics between novel coplanar system and traditional coplanar system. The negative response area of the proposed coplanar system is decreased. Compared this with traditional coplanar system, the anisotropic effects have the same trend; the affected amplitude of novel coplanar system is far less than that of the traditional coplanar system. The results of experiments demonstrate the superiority of the proposed coplanar system.

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An improved structure of coplanar coil system and its logging response

Cited by 2 publications

References 17 publications

Research on triaxial array induction logging response in inclined anisotropic formation

Research on triaxial array induction logging response in inclined anisotropic formation

A novel coplanar system with a minimal anisotropic effect

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