High-resolution orientation resistivity side direction logging instrument and logging method

Abstract

The invention relates to an orientation side direction logging instrument and a logging method. A high-resolution orientation resistivity side direction logging instrument mainly comprises an orientation electrode system and a measurement electronic circuit, wherein the electrode system consists of a plurality of side direction electrode rings which have different widths and are embedded on an insulation carrier and an orientation electrode ring M0; the M0 is arranged in the center of the electrode system; 14 electrode rings with different widths and the M0 are in axial symmetry and arranged at different intervals; each homonymic electrode ring is in short circuit through a wire and kept at the same potential; and the homonymic electrode rings, the orientation electrode ring, a reference electrode N and a loop B are connected with the measurement circuit through wires. By the high-resolution orientation resistivity side direction logging instrument and the logging method, a high-resolution side direction curve and an orientation side direction curve can be measured at the same time, and relatively detail logging information can be supplied to logging evolution; the high-resolution logging instrument can identify a thin layer and a thin mutual layer of which the thickness is 0.2 meter, so that an effective logging curve is supplied to thin layer logging; and cracks and caves can be effectively identified.

Description

technical field [0001] The invention relates to an azimuth lateral logging tool and a logging method, in particular to a high-resolution azimuth resistivity lateral logging tool and a logging method. Background technique [0002] With the gradual deepening of oilfield exploration and development and the further increase of difficulty, the accuracy requirements for reservoir evaluation work are getting higher and higher, and logging tools need to have higher vertical resolution and larger radial detection depth. The ability to cover the entire wellbore and determine formation characteristics in a directional manner enables logging tools to measure more abundant formation information in heterogeneous formations and thin layers. [0003] The original dual laterolog tool can measure two deep and shallow resistivity curves. This information is the influence of the entire borehole on the measurement results. The heterogeneity information around the well cannot be extracted from th...

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Problems solved by technology

[0003] The original dual laterolog tool can measure two deep and shallow resistivity curves. This information is the influence of the entire borehole on the measurement results. The heterogeneity information around the well cannot be extracted from the measurement information. Scanning imaging can well analyze the incoming medium near the wellbore, but the detection depth of the micro-resistivity scanning tool and the scanning imaging around the wellbore is very shallow. The 12 azimuth electrodes of the high-resolution azimuth laterolog tool can obtain an Although the resolution of the high-resolution azimuth resistivity is lower than that of the peripheral scanning imager and the micro-resistance scanning imager, its detection depth is far greater than that of the peripheral scanning imager and the micro-resistance scanning imager

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