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Method for evaluating evolution of different types of pores in shale

一种评价方法、泥页岩的技术，应用在悬浮液和多孔材料分析、土料测试、仪器等方向，能够解决尚未形成评价方法、缺乏泥页岩孔隙不同类型孔隙划分原则、无法区分孔隙类型等问题

Active Publication Date: 2017-10-03
CHINA UNIV OF PETROLEUM (EAST CHINA)
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Problems solved by technology

Cryogenic N 2 , CO 2 Although the high-pressure mercury injection experiment can quantitatively characterize the porosity of shale with different evolution degrees, it cannot distinguish the pore types.
High-resolution scanning electron microscope images can reflect the shape and size of pores, but there is a lack of accurate concepts for identifying shale pores on high-resolution scanning electron microscope images and the division principles of different types of pores
At present, there is no reasonable and effective evaluation method for the evolution of different types of pores in shale.

Method used

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  • Method for evaluating evolution of different types of pores in shale
  • Method for evaluating evolution of different types of pores in shale
  • Method for evaluating evolution of different types of pores in shale

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Embodiment 1

[0143] Example 1: This time the samples were taken from the Cretaceous Qingshankou Formation in the Songliao Basin. Taking the mud shale samples from Jilin Oilfield as an example, the mud shale of the Cretaceous Qingshankou Formation in Jilin Oilfield was established by using different types of pore evolution evaluation methods of mud shale Evolution map of different types of pores. The specific steps are:

[0144] A) Selection of shale samples: select a series of core samples from a single basin / depression with the same type of organic matter and differences in maturity (or differences in sample depth). Based on the research on the evolution of different types of pores in the Cretaceous Qingshankou Formation mud shale in the Songliao Basin, mud shale samples were collected from Chengshen 1, Xin 125, Cha 10, Cha 19, Rang 24 and Hei 62 wells. Sample information (Table 1) is as follows:

[0145] Table 1 Basic information of samples

[0146] well name

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Abstract

The invention relates to a method for evaluating evolution of different types of pores in shale. The method can be used in the field of unconventional oil and gas research. Along with the increasing of shale burial depth or maturity, all kinds of pores (including intergranular pores, grain inner pores, organic pores and cracks) developed in the shale are constantly changed so that the storage amount of shale oil and gas is influenced. According to the high resolution electron scanning electron microscopy map of shale, based on building of the classification standard and pore identification of different types of pores in shale, surface porosities of different types of pores are extracted. Through combination with data of low temperature N2 and CO2 adsorption experiments and high pressure mercury experiments, the total volume of the pores is acquired and an evolution map of various types of pores is built. The method has an important application value for unconventional shale oil and gas resource exploration.

Description

technical field [0001] The invention relates to an unconventional oil and gas exploration method, in particular to a method for evaluating the evolution of different types of pores in mud shale. Background technique [0002] At present, research on shale pore evolution focuses more on organic pores. The main reason is that the amount of methane adsorbed and gas content of shale has a good positive correlation with total organic carbon content (TOC), indicating that organic pores It may be the main space for shale gas accumulation (Chalmers and Bustin, 2008; Ross and Bustin, 2009; Zhang et al., 2009; 2010). A large number of organic pores are generally developed in the main gas-bearing shales in North America (Loucks et al., 2009; Ambrose et al., 2010; Curtis et al., 2011a; Slatt and O’Brien, 2011; Milliken et al., 2012). Organic pores have also been found in major lacustrine and marine shales in China (Zoucai et al., 2011; Liu Shugen et al., 2011; Chen Shangbin et al., 20...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N15/08
CPCG01N15/088G01N33/24G01N15/0886G01N2015/0833
Inventor 王民刘洋李传明卢双舫
Owner CHINA UNIV OF PETROLEUM (EAST CHINA)
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