Method and device for identifying geological structure of horizontal well

Abstract

The invention provides a method and device for identifying a geological structure of a horizontal well. The method comprises the following steps of: acquiring an actually measured gamma logging curveof a guide hole well section in the horizontal well, an actually measured azimuth gamma imaging logging map of a horizontal well section, and the actually measured gamma logging curve of a straight well closest to the horizontal well; preliminarily determining the geological structure of the horizontal well section according to the actually measured azimuth gamma imaging logging map of the horizontal well section; establishing an initial geometric model for the horizontal well section according to the actually measured gamma logging curve of the straight well or the actually measured gamma logging curve of the guide hole well section, wherein the initial geometric model comprises a well trajectory and a stratum model; adjusting the stratum model in the initial geometric model according tothe geological structure of the horizontal well section; and identifying the geological structure of the horizontal well according to an adjusted geometric model. The method and device for identifyingthe geological structure of the horizontal well can identify different geological structures of the horizontal well and has high identification precision.

Description

technical field [0001] The invention relates to the fields of petroleum well logging and geology, in particular to a technology for identifying geological structures of horizontal wells. Background technique [0002] Identifying geological structures in horizontal wells is very important for subsequent guidance of fracturing perforation and oil and gas development. [0003] The traditional horizontal well geological structure identification method is generally carried out by combining micro-resistivity scanning imaging logging with seismic section, but the resolution of seismic section is very low, and the identification of geological structure by micro-resistivity scanning imaging logging is usually only a relatively simple identification. Geological structures such as small faults, and many structures such as anticlines, synclines, folds, and pinch-outs are almost impossible to identify, and the identification accuracy is low. Contents of the invention [0004] An embod...

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Problems solved by technology

[0003] The traditional horizontal well geological structure identification method is generally carried out by combining micro-resistivity scanning imaging logging with seismic section, but the resolution of seismic section is very low, and the identification of geological structure by micro-resistivity scanning imaging logging is usually only a relatively simple identification. Geological structures such as small faults, many structures such as anticlines, synclines, folds, pinch-outs, etc. are almost impossible to identify, and the identification accuracy is low

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