A Method of Obtaining Logging Density Curve

A technology of density curves and curves, which is applied in the processing field of logging density curves, to achieve the effect of saving manpower and high precision

Active Publication Date: 2017-04-12
PETROCHINA CO LTD
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  • Abstract
  • Description
  • Claims
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Problems solved by technology

[0006] Aiming at the disadvantage of using a single velocity curve to calculate the density in the prior art, the purpose of the present invention is to provide a method for obtaining the logging density curve, by effectively extracting the lithology and physical characteristics contained in various logging curves, using wavelet gravity Structured information fusion method to obtain a more accurate and closer to the actual density curve

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Embodiment Construction

[0047]In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments It is a part of embodiments of the present invention, but not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.

[0048] An embodiment of the present invention provides a method for obtaining a well logging density curve, image 3 It is a flow chart of the density curve reconstruction method of this embodiment, and the process includes the following steps:

[0049] S101. Obtain a spontaneous potential curve (SP) and an acoustic time difference curve (AC)...

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Abstract

An embodiment of the invention provides a method for acquiring a logging density curve. The method includes the specific steps of acquiring a spontaneous potential curve of a target well and an interval transit time curve thereof; subjecting the spontaneous potential curve and the interval transit time curve to curve fusion computation on the basis of a wavelet transform Mallat algorithm so as to obtain a density coefficient curve of the target well; calculating density data of an area where the target well locates and the density coefficient curve to obtain the density curve of the target well. The method according to the embodiment has the advantages that lithological and physical characteristics contained in the spontaneous potential curve and the interval transit time curve are effectively extracted and are effectively fused by means of wavelet reconstruction based information fusion, and the logging density curve obtained by calculation is higher in precision and is more approximate to an actual density curve.

Description

technical field [0001] The invention relates to a processing technology of a well logging density curve, in particular to a method for obtaining a well logging density curve. Background technique [0002] As far as the physical basis of its method is concerned, density logging belongs to radioactive logging, and a gamma ray source, usually cesium, is required for measurement. 137 ( 55 Cs 137 ) or cobalt 60 ( 27 co 60 ), high logging operation requirements lead to the fact that before the 1990s, there were not many density logging construction operations in my country's oilfield development. Research and development of oil exploration technology is a very meaningful job. If the density curve close to the actual well can be obtained only by calculation, it will greatly reduce the manpower and material resources of scientific and technological research and development, and improve the efficiency of oil exploration. [0003] At present, in well logging interpretation and s...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E21B49/00
CPCE21B49/00E21B49/003
Inventor 胡水清刘文岭宋新民石成方田昌炳
Owner PETROCHINA CO LTD
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