Method for determining clay mineral content of shale gas reservoir

A technology for clay minerals and shale gas, which is applied in the field of determining the content of clay minerals in shale gas reservoirs, can solve the problems of poor universality and universality, and achieve good universality, good calculation accuracy, and good universality

Pending Publication Date: 2022-03-11
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The above two mainstream methods all need to combine a certain area, a certain well, a certain layer (series / segment), and core clay mineral content to determine model parameters, regression coefficients, etc., which have obvious regional limitations and poor versatility and universality.

Method used

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  • Method for determining clay mineral content of shale gas reservoir
  • Method for determining clay mineral content of shale gas reservoir
  • Method for determining clay mineral content of shale gas reservoir

Examples

Experimental program
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Effect test

Embodiment 1

[0038] This example provides a method for determining the content of clay minerals in shale gas reservoirs. Using the method, the content of clay minerals in shale gas reservoirs of 8 wells in the Wufeng Formation-Longmaxi Formation in the Sichuan Basin and surrounding marine facies evaluation, such as figure 2 As shown, the 8 wells are Weiye 23-1 Well, Jiaoye 1 Well, Jiaoye 41-5 Well, Jiaoye 5 Well, Nanye 1 Well, Dingye 1 Well, Renye 1 Well, Pengye Well Page 1 well.

[0039] The method is based on the relationship between the depositional water depth of shale gas reservoirs and the deposition rate of clay minerals in shale gas reservoirs, and uses the natural gamma ray spectrum logging data of 8 wells to quantitatively calculate the shale gas reservoirs of 8 wells respectively. Clay mineral content. The natural gamma ray spectrum logging data includes the natural gamma ray spectrum thorium curve TH and the natural gamma ray spectrum uranium curve U. The natural gamma ray ...

Embodiment 2

[0053] This example provides a method for determining the content of clay minerals in shale gas reservoirs, using the method to analyze the clay minerals in well Jinye 1 of the Cambrian Qiongzhusi Formation in the Sichuan Basin and surrounding marine facies Content is evaluated, the distribution of the Jinye 1 well is as follows figure 2 shown.

[0054] The method is based on the relationship between the sedimentary water depth of the shale gas reservoir and the deposition rate of clay minerals in the shale gas reservoir, and uses the natural gamma ray spectrum logging data of the Jinye 1 well to quantitatively calculate the shale gas reservoir of the Jinye 1 well. Layer clay mineral content. The natural gamma ray spectrum logging data includes the natural gamma ray spectrum thorium curve TH and the natural gamma ray spectrum uranium curve U. The natural gamma ray spectrum thorium curve TH and the natural gamma ray spectrum uranium curve U of Jinye 1 well were obtained by u...

Embodiment 3

[0061] This example provides a method for determining the content of clay minerals in shale gas reservoirs. Using the method, the well Mouye 1 of the Shanxi Formation-Taiyuan Formation in the Kaifeng Depression of the South North China Basin and 4 wells in the continental facies of the Sichuan Basin The clay mineral content of the shale gas reservoir is evaluated, such as Figure 5 As shown, the four continental wells in the Sichuan Basin are the Dongyuemiao section of Well Jianye HF-1, the Dongyuemiao section of Well Fuye 10, the Da'anzhai-Ma'an Dongyuemiao section of Well Yuanlu 4, and the Da'anzhai section of Well Xinglong 101. - Ma'anshan - Dongyue Temple section.

[0062] The method is based on the relationship between the depositional water depth of the shale gas reservoir and the deposition rate of clay minerals in the shale gas reservoir, and uses the natural gamma ray spectrum logging data of the above five wells to quantitatively calculate the shale gas content of th...

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Abstract

The invention belongs to the field of unconventional oil-gas exploration and development, and discloses a method for determining the clay mineral content of a shale gas reservoir. According to the method, based on the relation between the shale gas reservoir deposition water depth and the shale gas reservoir clay mineral deposition velocity, the shale gas reservoir clay mineral content is quantitatively calculated through natural gamma-ray spectrum logging information. The method comprises the following steps: calculating a thorium-uranium ratio curve by using thorium and uranium curves of natural gamma-ray spectrum logging; analyzing and determining a linear positive correlation between the clay mineral content and the thorium-uranium ratio curve in a semi-logarithmic coordinate system; and establishing a relational expression between the thorium-uranium ratio curve and the clay mineral content of the shale gas reservoir, and realizing quantitative calculation of the clay mineral content. The method has good universality for marine facies and continental facies shale gas reservoirs, model parameters or regression coefficients do not need to be determined for specific regions, specific wells and specific layers (sections/groups), and an effective technical means is provided for quantitative evaluation of unconventional shale gas reservoir parameters.

Description

technical field [0001] The invention belongs to the field of unconventional oil and gas exploration and development, and more specifically relates to a method for determining the content of clay minerals in shale gas reservoirs. Background technique [0002] Evaluation of clay mineral content based on Gamma Ray logging data is a common method in oil and gas exploration (Bassiouniz, 1994). According to the natural gamma value of pure mudstone section and pure lithology section (sandstone / carbonate rock, etc.) ) / (GRmax-GRmin) or related deformation formula to calculate clay mineral content. For unconventional shale gas reservoirs, the evaluation error of clay mineral content using the above method is large. The fundamental reason is that in addition to the influence of clay minerals on the natural gamma radioactivity, the enrichment of radioactive uranium by organic matter will also enhance the natural gamma response, resulting in high evaluation results. [0003] In recent...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01V5/04
CPCG01V5/04
Inventor 路菁刘坤李军张爱芹王晓畅邹友龙刘秘
Owner CHINA PETROLEUM & CHEM CORP
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