Well logging curve automatic tiered value extraction and evaluation method
A technology of automatic layering and logging curves, applied in the field of geophysical logging, can solve problems such as low accuracy, long working cycle, and poor timeliness
Active Publication Date: 2015-07-22
CHINA NAT OFFSHORE OIL CORP +1
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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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[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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The invention provides a well logging curve automatic tiered value extraction and evaluation method and aims to perform tiering, value extraction and evaluation automatically according to well logging original curves and result curves. By the aid of the method, three specific targets are achieved, in other words, 1, the tiering is implemented automatically according to the change features of multiple well logging curves and boundary conditions comprehensively; 2, according to the curve shape, the representative value of each curve is acquired in the tiered manner; 3, the formation properties are evaluated automatically according to the value extraction result and criterion. According to the method, the initial result is provided for the subsequent well logging interactive interpretation and evaluation so as to improve the interpreting efficiency. The method can be applied to well logging curve square wave promotion and resistivity well logging 2D inversion initialization directly.
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 ...
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Inventor 谢玉洪林德明钟华明曾少军何胜林
Owner CHINA NAT OFFSHORE OIL CORP