A Correction Method of Highly Deviated Well Logging Curve

Abstract

The invention discloses a correction method for a highly-deviated well logging curve. The method comprises the following steps: acquiring a compensation neutron value, a density value and a depth value of a vertical well standard layer in a regional standard layer; establishing a relational expression of the compensation neutron value and the density value changing along with the depth of the vertical well standard layer; acquiring a theoretical value of the compensation neutron and a theoretical value of the density of the highly-deviated well standard layer; acquiring actual measurement values of the compensation neutron and the density of the highly-deviated well standard layer; acquiring correction amounts of the compensation neutron and the density of a highly-deviated well inclined shaft section; and correcting a compensation neutron curve and a density curve of the highly-deviated well inclined shaft section. According to the method in the invention, the accuracy of environment correction of the compensation neutron curve and the density curve in the highly-deviated well is improved, and further the exploration and development work of the oil field can be guided.

Description

technical field [0001] The invention relates to the technical field of oil and gas exploration and development, in particular to a method for correcting logging curves of highly deviated wells. Background technique [0002] With the development of oilfield exploration and development technology, highly deviated wells are widely used in complex oil and gas reservoirs. In practical applications, due to the influence of gravity or well trajectory, the neutron and density logging tools in the deviated section of highly deviated wells tend to push against the borehole wall not tightly, resulting in the compensation of neutron and density logging curves. The recording quality is not high, and there is a large difference in the logging response characteristics of vertical wells, which affects the accuracy of reservoir porosity calculation and logging reservoir evaluation in highly deviated wells. However, how to quickly and accurately correct neutron compensation and density curve...

AI Technical Summary

Problems solved by technology

This method is mostly used for the calibration of conventional logging curves in vertical wells, on the premise that the compensated neutron and density logging response values ​​of the standard layer within the work area are the same, and will not change with the difference in the depth of the standard layer in different wells. The impact of formation compaction on the properties of the standard formations, that is, the standard formations at different depths should have different logging response values, especially in formations with weak diagenesis, if the change of formation depth has no effect on the logging response values will greatly affect the accuracy of logging curve correction, and bring great difficulties to reservoir porosity calculation and logging reservoir evaluation

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