摘要
The influence of the bed boundary,borehole drilling fluid,invasion and the tool eccentricity on apparent conductivity of the three-coil array of a 3D induction well logging tool was analyzed.The results show that the apparent conductivity in the XX/YY direction can be affected more by borehole drilling fluid than the apparent conductivity in the ZZ direction.In the presence of invasion,the shift direction of the apparent XX/YY-direction conductivity is opposite to the ZZ-direction apparent conductivity.The borehole drilling fluid and invasion affect XZ/ZX-direction apparent conductivity mainly in the boundary.A decentralized tool will not affect the ZZ-direction apparent conductivity.When the tool is decentralized in the X direction,the apparent conductivity in the YY direction can be significantly distorted.But when the tool is decentralized in the Y direction,the effect on the apparent conductivity in the XX direction will be the maxmum.