Evaluation method of shale organic matter porosity

An evaluation method and technology of organic matter, applied in the direction of suspension and porous material analysis, measurement devices, instruments, etc., can solve the problems of difficult extraction of organic matter, low porosity accuracy, immaturity, etc., and achieve accurate storage capacity and practical method. Low, easy-to-operate effects

Active Publication Date: 2016-06-15
SHANDONG UNIV OF SCI & TECH
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Problems solved by technology

Because the organic matter is difficult to be extracted relatively completely, and the method for directly quantitatively measuring the organic matter pore volume and porosity of mud shale is not yet mature, it is impossible to obtain the organic matter pore volume and porosity of mud shale more accurately.
There are three main methods for evaluating the porosity of organic matter in mud shale: the first is the method of argon ion polishing combined with scanning electron microscopy, which semi-quantitatively analyzes the size and porosity of organic matter in mud shale through human observation. The main disadvantage is human influence. The second method is to calculate the porosity of mud shale by computerized tomography technology, and obtain the volume of organic matter and organic pore volume by tomography to calculate the organic matt

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  • Evaluation method of shale organic matter porosity
  • Evaluation method of shale organic matter porosity
  • Evaluation method of shale organic matter porosity

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Embodiment 1

[0070] The detection of the organic matter porosity of the black shale in the northeastern Sichuan Basin includes the following steps:

[0071] 1) According to the geological data such as mercury injection curve and pore volume distribution map of the black shale of the Longmaxi Formation in the area to be tested, it is confirmed that most of the pores of the black shale of the Longmaxi Formation have a pore size of 2-50 nm, so the isothermal adsorption method is chosen to test the mud shale Pore ​​volume is used to calculate the organic matter porosity of shale;

[0072] 2) The type of organic matter in this area is type II kerogen, and the vitrinite reflectance R O is 2.8 to 3.2, and the organic carbon content analysis and isothermal adsorption experiment analysis of the black shale samples of the Longmaxi Formation in the test area are carried out to determine the organic carbon content TOC of each sample. 1 、TOC 2 、TOC 3 、…TOC n and the total pore volume V of each samp...

Embodiment 2

[0087] The detection of the organic matter porosity of the gray-black carbonaceous mudstone of the Longmaxi Formation in the southeastern Sichuan Basin includes the following steps:

[0088] 1) According to the geological data such as mercury injection curve and pore volume distribution map of the black shale of the Longmaxi Formation in the area to be measured, it is determined that the black shale of the Longmaxi Formation contains relatively few mesopores (pore diameter 2-50nm), so choose a more economical one. The porosity of mud shale is measured by helium porosimeter to calculate the porosity of organic matter in mud shale;

[0089] 2) The type of organic matter in this area is type I kerogen, and the vitrinite reflectance R O From 2.2 to 2.6, carry out organic carbon content analysis and isothermal adsorption experiment analysis on the black shale samples of Longmaxi Formation in the testing area to determine the organic carbon content TOC of each sample 1 、TOC 2 、TOC...

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Abstract

The invention relates to an evaluation method of shale organic matter porosity. The method is characterized by the following steps: 1) organic carbon content and total pore volume or total porosity of shale samples under homologous organic matter type and same organic matter thermal evolution degree in an area to be measured are measured; 2) relation between the organic carbon content and total pore volume or total porosity is established; 3) a plane-coordinate system with the organic carbon content being the horizontal axis and with the total pore volume or total porosity being the vertical axis is established; 4) data of the organic carbon content and total pore volume or total porosity of the shale samples are introduced into the plane-coordinate system, a straight line is fitted out, and slope and vertical intercept of the straight line are calculated; and 5) organic matter pore volume or organic matter porosity of the shale samples in the area to be measured is calculated, and organic matter porosity of shale is further evaluated so as to finish reservoir capacity evaluation of shale reservoir stratum of the area to be measured. The method of the invention is easy to operate, and is practical and low-cost.

Description

technical field [0001] The invention relates to a method for evaluating the porosity of organic matter in mud shale, belonging to the field of geological exploration. Background technique [0002] Shale gas is a natural gas resource that can be exploited in muddy shale formations. Shale gas is a typical unconventional natural gas, which is produced in low porosity and permeability reservoir rock series dominated by organic-rich shale. There are significant differences in the controlling factors for the enrichment and accumulation of shale gas and conventional gas. Shale gas accumulation mainly includes self-generation and self-storage, early accumulation time, no obvious traps, low porosity and low permeability of reservoirs, and various gas occurrence states and shale gas reservoirs are easier to preserve. The researchers found that the organic matter in shale will produce a large number of pores during the thermal evolution process. These pores are important storage spac...

Claims

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Application Information

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IPC IPC(8): G01N15/08
CPCG01N15/088
Inventor 韩作振夏迪闫华晓赵辉高丽华韩梅王兆鹏赵延洋孙彬孟瑞瑞庄定祥
Owner SHANDONG UNIV OF SCI & TECH
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