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Shale gas reservoir staged comprehensive evaluating method

A comprehensive evaluation and shale gas technology, applied in the fields of earthwork drilling, wellbore/well components, etc., can solve the problem of inaccurate evaluation of the quality of shale gas reservoirs, and achieve effective identification and quantitative evaluation, effective identification and evaluation , the intuitive effect of indicators

Inactive Publication Date: 2018-06-29
CHINA NAT PETROLEUM CORP CHUANQING DRILLING ENG CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, pure analysis of geological parameters (TOC content, shale thickness, organic matter maturity, organic matter type, etc.) cannot accurately evaluate the quality of shale gas reservoirs

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] A grading comprehensive evaluation method for shale gas reservoirs, characterized in that: collecting shale gas well core analysis test data and logging data, determining the corresponding relationship between the development characteristics of shale gas reservoirs in the target area and logging parameters, and qualitatively identifying shale Gas reservoir: Select and determine the key parameter system for shale gas reservoir evaluation, establish a comprehensive evaluation standard for shale gas reservoir classification based on the characteristics and correlation of each key parameter, and quantitatively classify and evaluate the quality of shale gas reservoirs in the target area.

[0028] Described method specifically comprises the steps:

[0029] a. Obtain core analysis test data and logging data of shale gas wells in the target area;

[0030] b. Perform rock electrical correction for core analysis data, logging data and actual drilling data;

[0031] c. Qualitativ...

Embodiment 2

[0043] The present invention provides a shale gas reservoir graded comprehensive evaluation method, which comprises the following steps:

[0044] a Systematic acquisition of core analysis test data and logging data of shale gas wells in the target area;

[0045] b Perform rock electrical correction on the core analysis data, logging data and actual drilling data;

[0046] cQualitative identification of shale gas reservoirs based on the shape and amplitude of logging series such as natural gamma ray, uranium content, compensated acoustic wave, compensated neutron, compensated density and dual laterometry;

[0047] d Determine high-quality pages with natural gamma>170API, uranium content>7.5ppm, compensated sound wave 70~100μs / ft, compensated neutron 7~25p.u, compensated density 2.4~2.62 g / cm3, and double lateral direction>15Ω·m Logging response characteristics of rock and gas reservoirs;

[0048] e. Carry out calibration log processing and interpretation of core analysis data...

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Abstract

The invention discloses a shale gas reservoir staged comprehensive evaluating method. Shale gas well core analysis and test data and logging information are collected, the corresponding relation of the development characteristics and logging parameters of a shale gas reservoir in a target area is determined, and the shale gas reservoir is identified qualitatively; and a key parameter system for evaluating of the shale gas reservoir is selected and determined, shale gas reservoir staged comprehensive evaluating standards are built according to the characteristics and correlation of key parameters, and the quality of the shale gas reservoir in the target area is divided and evaluated quantitatively. The multiple key parameters of the shale gas reservoir are composited, the logging response characteristics of the single-well shale gas reservoir section are combined, thus staged comprehensive evaluating of the shale gas reservoir is formed, and the shale gas reservoir can be evaluated quantitatively in the two aspects of geology and geophysical logging.

Description

technical field [0001] The invention relates to a shale gas reservoir evaluation method, in particular to a shale gas reservoir graded comprehensive evaluation method, which belongs to the technical field of shale gas exploration and development. Background technique [0002] Shale gas is an important unconventional natural gas resource after coalbed methane and tight sandstone gas, and an important supplement to conventional oil and gas resources. It has the characteristics of long mining life, long production cycle, and large gas-bearing area. Since 2009, China has successively organized national shale gas resource potential assessment, selection of favorable areas, and bidding for exploration blocks. Major breakthroughs have been made in the Sichuan Basin and the Ordos Basin. The establishment of national-level shale gas industrialization demonstration areas, and the establishment of shale gas pilot test areas in Zhaotong, Yunnan, Fuling, Chongqing, Yanchang, Shaanxi and ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21B49/00
CPCE21B49/00
Inventor 漆麟王维斌任晓海
Owner CHINA NAT PETROLEUM CORP CHUANQING DRILLING ENG CO LTD
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