A Discrimination Method for Beach Bar Structural Units Constrained by Geological Models

Abstract

The invention relates to a beach bar structure unit discrimination method under the constraint of a geological model. The development process of a beach bar is divided into four stages, and five sedimentary structure units are subdivided. The correspondence between four stages and five units is determined. Twelve electrical imaging modes corresponding to five structure units are set up. The conventional logging curve characteristic of each structure unit is summarized. A conventional logging curve with strong sensitivity is selected through a cross plot analysis method. According to a Bayes discrimination method in discrimination analysis and according to the mutual superimposition relationship between the sedimentary units in a vertical profile, the sedimentary type and the evolution stage of the beach bar are determined. According to the invention, the reasonable and effective constraint of the geological model is used; the electrical imaging modes and the conventional logging curve characteristic of each structure unit of the beach bar are combined; according a Bayes discrimination principle, the conventional logging curve with strong sensitivity is selected to establish a discrimination formula; on the basis of the discrimination formula, calculation is carried out; the structure units are accurately and rapidly identified; and the discrimination accuracy is improved.

Description

technical field [0001] The invention belongs to the technical field of geological research, and in particular relates to a method for discriminating structural units of beach bars under the constraints of geological models. Background technique [0002] The traditional sedimentary facies research method needs to identify the sedimentary environment by observing the rock composition, structure and sedimentary structure parameters of the core. Such a sedimentary facies research method can only identify the sedimentary environment of the coring section, but cannot carry out the non-coring section. Due to the high cost of coring, the developed oil and gas fields often cannot obtain sufficient coring analysis data. Therefore, using limited coring data combined with a large amount of logging data to carry out logging facies research has become the main method for sedimentary facies research. [0003] Logging facies analysis is to extract the change characteristics of logging curve...

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Problems solved by technology

[0007] The purpose of the embodiments of the present invention is to provide a method for discriminating structural units of beach bars under the constraints of geological models, aiming to solve the problem that existing technologies cannot perform effective logging facies analysis and automatic rapid discrimination on different sedimentary types of beach bars

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