Method for evaluating porosity of mud shale at objective layer segment

A technology for shale porosity and mud shale, which is applied in the fields of geology, petroleum and mining exploration and development to achieve the effects of easy operation, high measurement accuracy and low cost

Inactive Publication Date: 2014-05-28
CHINA UNIV OF PETROLEUM (EAST CHINA)
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Problems solved by technology

At present, there is no good method in China to evaluate the total porosity, organic porosity and inorganic porosity of shale in the target interval.

Method used

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  • Method for evaluating porosity of mud shale at objective layer segment
  • Method for evaluating porosity of mud shale at objective layer segment
  • Method for evaluating porosity of mud shale at objective layer segment

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Embodiment 1

[0033] Embodiment 1: as Figure 15 Described, a method for evaluating the porosity of mud shale in the target interval, comprising the following steps;

[0034] Step 1: Carry out X-ray diffraction whole-rock analysis, X-ray diffraction clay mineral relative content and organic carbon content analysis on mud shale samples at different depths in the target interval, and determine the mud sheets with a mass of M at different depth points of the mud shale in the target interval The mass m of various components in the rock framework 1 、m 2 、m 3 …m n , the unit of mass is g, according to the true density ρ of various minerals true1 , ρ true2 , ρ true3 …ρ truen , the true density ρ of various minerals true1 , ρ true2 , ρ true3 …ρ truen The unit is g / cm 3 , to calculate the volume V occupied by various components in the shale framework with mass M 1 , V 2 , V 3 …V n , the unit of the volume occupied by various components in the shale framework is cm 3 , the mud shale ...

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Abstract

The invention relates to a method for evaluating the porosity of mud shale at an objective layer segment, and belongs to the technical field of exploration and development of petroleum, geology and mining industry. The method can be used for evaluating the total porosity, the organic porosity and the inorganic porosity of the mud shale at the objective layer segment in a shale gas well. The method comprises the following steps: (1) determining the mass of various ingredients in a mud shale sample skeleton in unit mass at each depth point of the objective layer segment and the density of each dried sample block body and calculating the total porosity of the mud shale in all the depth points via the combination of the actual density of various minerals; (2) calculating the organic porosity (Phi organic') formed by the hydrocarbon generation of the mud shale at the objective layer segment by utilizing chemical kinetics; (3) seeking a solution of the organic porosity (Phi organic) according to scanning electron micrographs of multiple argon ion polishing samples in the same depth point; (4) calibrating the organic porosity (Phi organic') calculated according to the chemical kinetics by utilizing the organic porosity (Phi organic); and (5) seeking a solution of the inorganic porosity by utilizing a difference value of the total porosity and the calibrated organic porosity.

Description

technical field [0001] The invention relates to a method for evaluating the porosity of mud shale in a target interval, belonging to the technical fields of petroleum, geology, and mining exploration and development. Background technique [0002] In the process of exploration and development of shale oil and shale gas, the total porosity, organic porosity and inorganic porosity of shale reservoirs are key parameters for calculating shale oil and shale gas resources and formulating development plans. The total porosity of shale oil and shale gas reservoirs directly affects the calculation of shale oil and shale gas resources, and is used to evaluate the production cycle of shale oil and shale gas development wells. In addition, it is necessary to clarify the organic porosity and inorganic porosity in shale reservoirs separately, in order to further calculate the occurrence of shale oil and shale gas and their content in free state and adsorbed state, and to evaluate shale oil...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N15/08
Inventor 陈方文丁雪卢双舫
Owner CHINA UNIV OF PETROLEUM (EAST CHINA)
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