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AssigneeBaker Hughes Incorporated
InventorsBerthold Kriegshauser, Steve McWilliams, Otto Fanini, Liming Yu
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A fast, efficient and accurate pseudo 2-D inversion scheme for resistivity determination of an anisotropic formation uses data from a tool (3DEX) comprising three transmitters and three corresponding receivers sampling the formation in a plurality of spatial directions. An initial model of the formation including invasion zones is obtained using a conventional multifrequency and/or multispacing logging tool. A pseudo 2-D inversion scheme combines an accurate full 2-D forward solution of the synthetic responses of the earth model with a 1-D approximation of the sensitivity matrix of the horizontally layered anisotropic background model. The timesaving compared to a regular 2-D inversion scheme can be tremendous. The applicability of this scheme is important in cases when borehole and near-zone effects do not allow an interpretation based on 1-D inversion. A comparison of the pseudo 2-D inversion scheme versus a full 2-D inversion using a realistic synthetic example shows that the pseudo 2-D inversion scheme performs as well as the full 2-D inversion, but in a much shorter time.
A method of determining a parameter of interest of subsurface formations surrounding a borehole, the method comprising:
A method of determining a parameter of interest of subsurface formations surrounding a borehole, the method comprising:
A method of determining a parameter of interest of subsurface formations surrounding a borehole, said formation including invaded zones, the method comprising:
Dependencies are inferred from the claim text.