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A Method for Automatic Layering and Evaluation of Well Logging Curves

An automatic layering and logging curve technology, applied in the field of geophysical logging, can solve problems such as long working cycle, poor timeliness, and error-prone

Active Publication Date: 2018-03-02
CHINA NAT OFFSHORE OIL CORP +1
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  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

It generally takes 2 people and 3 days or more to complete the logging evaluation of a well. There are many problems such as long working cycle, poor timeliness, low precision, and error-prone.
Nowadays, well logging evaluation work from data processing to comprehensive interpretation can be completed interactively under the computer graphical interface. However, although the interactive interpretation under the graphical interface has been greatly improved in operation, it is still difficult to avoid the large gaps in manual interpretation. part of the problem

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Embodiment Construction

[0029] In order to better understand the above-mentioned technical solution, the above-mentioned technical solution will be described in detail below in conjunction with the accompanying drawings and specific implementation methods.

[0030] Such as figure 1 Shown, apply the present invention to carry out logging interpretation evaluation work, comprise the following steps:

[0031] 1. Automatic layering

[0032] (1) The resulting curves after digital processing of logging data - porosity (POR), water saturation (SW), shale content (VSH) curves are weighted and synthesized into a comprehensive curve;

[0033] S= SW*MWsw + VSH*MWvsh + POR*MWpor

[0034] (2) Smooth and filter the synthesized comprehensive curve (5-point moving weighted average method, which can be divided into multiple levels according to the change of weight coefficient);

[0035] S=MW1*S[n-2]+MW2*S[n-1]+MW3*S[n]+MW4*S[n+1]+MW5*S[n+2]

[0036] (3) Calculate the first-order derivative and second-order deriva...

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Abstract

The present invention provides a kind of logging curve automatic layering value and evaluation method, for logging original curve and result curve to carry out automatic layering, automatic value and automatic evaluation, this method has realized 3 specific goals: 1. Comprehensive Automatic stratification of the change characteristics and boundary conditions of multiple logging curves; 2. Obtain the representative values ​​of each curve layer by layer according to the shape of the curves; 3. Automatically evaluate the properties of the formation according to the value results and criteria. The main purpose of the invention is to provide initial results for the subsequent interactive interpretation and evaluation of logging, so as to improve the efficiency of interpretation work. The invention can be directly applied in aspects such as square wave of well logging curve, 2D inversion initialization of resistivity logging and the like.

Description

technical field [0001] The invention relates to the technical field of geophysical well logging, in particular to a method for automatically layering values ​​and evaluating well logging curves. Background technique [0002] With the rapid development of human civilization, the demand for energy is increasing day by day, and the needs of consumers in modern society are becoming more and more diversified. Industrial production requires rapid transformation of products, which has increased the demand for oil and natural gas. In order to effectively detect oil and gas layers, in the process of exploration and development of oil and gas fields, digital processing and comprehensive interpretation of well logging data has become one of the main tasks of logging interpreters. As well as the result curve after the digital processing of logging data, at the same time refer to drilling, geology, mud logging, core and other data to conduct formation evaluation, aiming to determine the ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01V9/00
Inventor 谢玉洪林德明钟华明曾少军何胜林
Owner CHINA NAT OFFSHORE OIL CORP