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Multi-parameter Quantitative Analogy Evaluation Method for Shale Gas Reservoirs

A quantitative analogy and evaluation method technology, applied in the fields of electrical digital data processing, special data processing applications, instruments, etc., can solve the problems of reducing multiple solutions, single interpretation method, poor quantitative quality, etc., to achieve the effect of improving interpretation accuracy

Active Publication Date: 2017-04-12
CHINA PETROCHEMICAL CORP +2
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Problems solved by technology

[0003] The existing domestic shale gas reservoir logging and logging interpretation evaluation is mainly based on the traditional conventional oil and gas layer interpretation method, which introduces organic carbon content TOC, free gas content Gf, adsorbed gas content Gs, and total gas content Gt , brittleness index BRIT and other shale gas reservoir evaluation parameters, but in the process of interpretation, the general qualitative comparative evaluation of tabular data is mainly used, and comprehensive key evaluation indicators cannot be formed. The interpretation method is relatively single and not intuitive , poor in quantification and multi-solution, it is necessary to form a multi-parameter quantitative analogy evaluation method through practical research, especially a graphical evaluation method, to improve the reliability of the interpretation results and reduce the multi-solution

Method used

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  • Multi-parameter Quantitative Analogy Evaluation Method for Shale Gas Reservoirs

Examples

Experimental program
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Effect test

example 1

[0112] Example 1: Well JYHF-1 in eastern Sichuan and western Hubei

[0113]Well JYHF-1 is a key shale gas test well in a certain structure in eastern Sichuan and western Hubei. Logging and mud logging work were carried out respectively. After the drilling of the pilot section was completed, a sidetracking horizontal well was carried out according to the logging and logging interpretation results. . The 1st layer of the shale gas layer is 52.0m thick and has been discovered and interpreted in the pilot well in the Jurassic Dongyuemiao section. The specific explanation of the evaluation steps is:

[0114] Step 1: Build an Interpretation Database

[0115] The typical shale gas layer of Jurassic Well J111 confirmed by gas testing in this area is selected as the known contrast layer. Well J111 is located in the 598.0-646.0m section of the Jurassic Dongyuemiao section, with a thickness of 48.0m. The well was completed and fracturing for gas testing, and the daily natural gas prod...

example 2

[0151] Example 2: Well JY2 in the Middle Yangtze area

[0152] Well JY2 is a key shale gas prospecting well in a structure in southeastern Sichuan in the Middle Yangtze area. Logging and mud logging work were carried out respectively. The pilot well was discovered and interpreted in the lower part of the Silurian Longmaxi Formation-Ordovician Wufeng Formation. The 1st section of rock gas layer is 98.0m thick. The specific explanation of the evaluation steps is:

[0153] Step 1: Build an Interpretation Database

[0154] The typical shale gas layers of the lower part of the Silurian Longmaxi Formation-Ordovician Wufeng Formation in Well JY1 confirmed by the gas test in this area were selected as the known contrast layers. The 2326.0-2415.0m well section of Well JY1 is a sidetracked horizontal well with a horizontal section length of 1008m. It is divided into 15 stages for fracturing and gas testing. The daily natural gas production is 21.3×10 4 m 3 .

[0155] Obtain 9 key p...

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Abstract

The invention relates to a quantitative analogical evaluation method for multiple parameters of a shale gas reservoir. The method comprises the following steps of acquiring the porosity, organic carbon content, methane content, total gas content, gas saturation, brittleness index, thickness and other shale gas reservoir evaluation key parameters of a target layer to be explained and key evaluation parameters of a reference layer with regional representation through logging data, drawing a multi-parameter analogical plate, and observing and comparing by using visual observation to intuitively qualitatively evaluate the gas bearing characteristic of the layer to be explained; according to a fact that an analogical evaluation value=a parameter value of the target layer / a parameter value of the reference layer, calculating the analogical evaluation value of each parameter, calculating a multi-parameter quantitative analogical evaluation index Ia, drawing a multi-parameter quantitative analogical relevance judgment plate, drawing multi-parameter analogical related strength R2, drawing an Ia-R2 evaluation crossplot, and putting the analogical evaluation index Ia-analogical related strength R2 data points of the to-be-explained target layer in the Ia-R2 evaluation crossplot; outputting a result.

Description

technical field [0001] The invention relates to a multi-parameter quantitative analog evaluation method for shale gas reservoirs based on mud logging and well logging data, which is used for interpretation and evaluation of mud logging and well logging data in shale gas exploration and development. Background technique [0002] Shale gas is a new type of clean energy. Domestic exploration and development is still in its infancy. There are few shale gas fields discovered. Experience and methods for evaluating shale gas reservoirs using mud logging and logging data are relatively lacking, and there is even less practical use. Quantitative interpretation and evaluation method of shale gas logging. [0003] The existing domestic shale gas reservoir logging and logging interpretation evaluation is mainly based on the traditional conventional oil and gas layer interpretation method, which introduces organic carbon content TOC, free gas content Gf, adsorbed gas content Gs, and tota...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G06F19/00
Inventor 张建平冯爱国赵红燕石文睿任元石元会李光华
Owner CHINA PETROCHEMICAL CORP
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