Horizontal well true resistivity inversion method based on dual lateral logging

Abstract

The invention discloses a horizontal well true resistivity inversion method based on dual lateral logging. The horizontal well true resistivity inversion method comprises the steps that horizontal well dual lateral logging curve data and auxiliary logging curve data are obtained; according to logging curve data of an adjacent well or a pilot well, measured target well sections are layered, the formation interface is determined, and the initial formation resistivity of all separated layers is inversed; according to comparison of the horizontal well dual lateral logging curve data and the auxiliary logging curve data with the logging curve data of the adjacent well or the pilot well, the drilling layer section of a horizontal well is determined, and an initial formation model is built; according to the initial formation resistivity and the initial formation model, by combining dual lateral instrument parameters, dual lateral simulation curves of all the separated layers are generated; and whether the lateral simulation curves are consistent with dual lateral logging curves or not is judged, if not, according to the dual lateral logging curves and the geological characteristics, the initial formation resistivity and formation model are modified, and the final formation resistivity is output.

Description

technical field [0001] The invention relates to the technical field of geophysical well logging, in particular to a method for fast inversion of formation true resistivity based on dual laterolog data. Background technique [0002] With the deepening of the exploration and development of tight oil and gas and unconventional oil and gas in my country, and the continuous development of horizontal well drilling technology, the number of horizontal wells in my country has shown a good trend of doubling each year. In current domestic horizontal wells, wireline dual laterometry is still an important means to obtain formation resistivity. However, in horizontal wells, due to the change of instrument measurement environment, horizontal wells or highly deviated wells are affected by more factors than vertical wells, which causes the measured resistivity to deviate from the real resistivity, which makes the fluid identification through resistivity curves difficult. The capacity is re...

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Problems solved by technology

[0004] Comprehensively analyzing the existing research results of the predecessors, the following problems exist in the dual lateral true resistivity inversion of horizontal wells: (1) The predecessors mainly used numerical simulation methods to investigate the dual lateral resistivity of horizontal wells and highly deviated wells in various situations. Some researchers achieve the purpose of correction by making charts. However, this correction method requires the use of a large number of charts, and the charts can only be corrected for a single one, which cannot meet the requirements of horizontal wells; (2) There are many influencing factors in horizontal wells. , the current strict three-dimensional inversion processing of electrical logging is too idealized, and the traditional inversion method is slow for three-dimensional space inversion, and cannot consider the formation electrical anisotropy, or the factors considered are single; on the other hand, these methods are large Some of them are purely mathematical methods, as long as the error between the simulated logging curve and the measured curve is less than a given threshold ε, it is enough to apply, without considering whether it is reasonable for rock physics, geological environment and engineering conditions, etc.

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