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Method for calculating porosity of carbon-scrap-containing clastic rock reservoir through geophysical logging

A geophysical and porosity technology, used in geophysical measurement, measurement device, suspension and porous material analysis, etc. problem, to achieve good application effect, improve the accuracy of reservoir physical property evaluation, and achieve the effect of good consistency

Pending Publication Date: 2021-11-30
CHINA PETROLEUM & CHEM CORP +1
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Problems solved by technology

The carbon debris contained in clastic rocks will cause a large change in the skeleton value of the rock, and the skeleton value of the carbon debris is uncertain, and the existing method cannot accurately calculate the porosity

Method used

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  • Method for calculating porosity of carbon-scrap-containing clastic rock reservoir through geophysical logging
  • Method for calculating porosity of carbon-scrap-containing clastic rock reservoir through geophysical logging
  • Method for calculating porosity of carbon-scrap-containing clastic rock reservoir through geophysical logging

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Embodiment

[0039] A method for calculating porosity by geophysical logging of carbon-bearing clastic rock reservoirs, the method comprising:

[0040] Step 1. Determine the carbon debris content of the reservoir: use cuttings or drilling coring to determine the carbon debris content of the clastic rock reservoir.

[0041] Step 2. Determine the logging response characteristics of the carbon debris reservoir: use the carbon debris content calibration logging data determined in step 1 to analyze the logging response characteristics of the carbon debris reservoir. The well logging response features include natural gamma ray, resistivity, neutron, sonic time difference and density features.

[0042] Step 3. Build a model to calculate porosity:

[0043] 1) Establish a cross-plot between the carbon cuttings content and the numerical values ​​of each logging curve, analyze the correlation and quantitative relationship between the carbon cuttings content and each logging curve, and determine the ...

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Abstract

The invention relates to the technical field of petroleum geology exploration and development, in particular to a method for calculating porosity of a carbon-scrap-containing clastic rock reservoir through geophysical logging. According to the method, comprehensive analysis is carried out on the reservoir carbon scrap content obtained according to the rock debris, well drilling coring and laboratory measurement data, logging recognition characteristics of the carbon scrap-containing clastic rock reservoir are determined, the porosity calculation model is established, and the obtained porosity value is high in accuracy. According to the method, the reservoir physical property evaluation precision is obviously improved, a good application effect is achieved, and a reliable basis is provided for petroleum and development.

Description

technical field [0001] The invention relates to the technical field of petroleum geological exploration and development, in particular to a method for calculating porosity by geophysical logging of carbon-bearing clastic rock reservoirs. Background technique [0002] Studies have shown that carbon debris exists in various types of sediments, such as deep-sea sediments, lake deposits, river alluvial deposits, and eolian loess accumulations. Shallow water environment sediments often contain more carbon debris. The Jurassic in the Junggar Basin The reservoirs are mainly shallow-water delta deposits, with coal seams and carbon-bearing clastic rock reservoirs developed. Compared with rock minerals such as quartz, feldspar, and limestone, carbon clastics have greater plasticity. The porosity of the layer decreases. [0003] There are two main methods to determine reservoir porosity: ① rock sample experimental analysis method; ② geophysical porosity logging calculation method. Th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N15/08G01V11/00
CPCG01N15/088G01V11/00
Inventor 秦峰吴春文管永国边雪梅周涛陈雪牛靖靖李松涛李凌周惠莲
Owner CHINA PETROLEUM & CHEM CORP
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