Method for correcting carbon-oxygen ratio logging environment influencing factors

A technology of influencing factors and environmental influences, applied in the field of oil and gas exploration, can solve problems such as no correction method, and achieve the effects of improving interpretation ability, strong versatility, and improving accuracy

Active Publication Date: 2016-03-02
CHINA NAT OFFSHORE OIL CORP +1
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  • Abstract
  • Description
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  • Application Information

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Problems solved by technology

However, there is no corresponding correction method for the two influencing factors of annular fluid and gravel packing.

Method used

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  • Method for correcting carbon-oxygen ratio logging environment influencing factors
  • Method for correcting carbon-oxygen ratio logging environment influencing factors
  • Method for correcting carbon-oxygen ratio logging environment influencing factors

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Embodiment Construction

[0023] Below in conjunction with accompanying drawing and specific embodiment, the carbon-oxygen ratio logging environmental influence factor correction method of the present invention is described in further detail, specifically comprises the following steps:

[0024] In step 101, the well logging data is obtained by conventional methods of carbon and oxygen logging technology, and the C / O and Si / Ca logging curves are selected according to the logging data. interval, take the C / O curve values ​​of these two intervals; the schematic diagram of annular fluid interval identification is shown in figure 1 .

[0025] Step 102, Monte Carlo theoretical simulation: combining the actual geological and formation water analysis data of the target area to establish a model. The specific model is as follows: the wellbore part is composed of wellbore fluid, casing and cement sheath, and the wellbore is filled with fresh water. 33.3cm, the composition is CaSiO 3 , the density is 1.95g / cm3...

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Abstract

The invention discloses a method for correcting carbon-oxygen ratio logging environment influencing factors. A Monte-Carlo method is utilized for simulating a theory relation plate between the influencing factors and a measurement value, based on the theory plate, a marker bed method is used for selecting C / O values of influenced positions and C / O values of uninfluenced positions, and a trend-surface analysis fitting method is used for carrying out linear function fitting on the influenced C / O values and the uninfluenced C / O values to obtain a fitting relation expression between the influenced C / O values and the uninfluenced C / O values. According to the method, the two influencing factors of annular fluid and gravel filling can be corrected, the method is utilized for remarkably improving the reliability of logging response values of the influenced positions, then precision for explaining and evaluating remaining oil saturation through carbon-oxygen ratio logging is improved, and the method is high in universality.

Description

technical field [0001] The invention relates to a logging evaluation technology for improving the interpretation accuracy of remaining oil saturation calculated by carbon-oxygen ratio, in particular to a correction method for the influence of annular fluid and gravel packing in the logging process of carbon-oxygen ratio, and belongs to the technical field of oil and gas exploration. Background technique [0002] Carbon-oxygen ratio logging, also called carbon-oxygen ratio energy spectrum logging, is a new type of pulse neutron logging method. Petroleum mainly contains carbon and hydrogen elements, and water mainly contains oxygen and hydrogen elements. The relative content ratio of carbon and oxygen in the formation can be obtained through carbon-oxygen ratio logging, and missing oil and gas layers can be found in wells that have been casing. , to determine the remaining saturation of the oil reservoir in the oil well that has been produced, etc. [0003] In the process of ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21B49/00
CPCE21B49/00
Inventor 李跃林郭海敏何胜林郑永健王利娟
Owner CHINA NAT OFFSHORE OIL CORP
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