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A method and system for determining the dominant mode of shale natural gas

A technology for shale gas and natural gas, which is applied in the field of determining the advantageous occurrence mode of shale gas, and can solve problems such as complex key steps

Active Publication Date: 2019-06-18
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the various links and key steps involved in the above method are relatively complicated, and there is currently no simple and fast method for determining the dominant occurrence mode of shale gas.

Method used

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  • A method and system for determining the dominant mode of shale natural gas
  • A method and system for determining the dominant mode of shale natural gas
  • A method and system for determining the dominant mode of shale natural gas

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Embodiment Construction

[0049] The implementation of the present invention will be described in detail below in conjunction with the accompanying drawings and examples, so as to fully understand and implement the process of how to apply technical means to solve technical problems and achieve technical effects in the present invention. It should be noted that, as long as there is no conflict, each embodiment and each feature in each embodiment of the present invention can be combined with each other, and the formed technical solutions are all within the protection scope of the present invention.

[0050] The present invention utilizes the critical porosity of iso-free adsorption when the content of free gas and adsorbed gas in shale gas reservoirs determined by well logging data is equal, and proposes a method and system for determining the dominant occurrence mode of shale natural gas. Such as figure 1 Shown is a method flow chart according to an embodiment of the present invention, the following ref...

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Abstract

The invention discloses a method and system for determining a shale natural gas advantageous reservation mode. The method comprises the following steps that: the equal free adsorption critical porosity of a shale gas reservoir is determined by using logging data; the effective porosity of the shale gas reservoir is determined by using the logging data; and the shale natural gas advantageous reservation mode is determined according to the equal free adsorption critical porosity and the effective porosity. With the method and system of the invention adopted, a convenient means is provided for the determination of the shale natural gas advantageous reservation mode. The method and system have a great practical value in shale gas exploration and development.

Description

technical field [0001] The invention belongs to the technical field of unconventional oil and gas exploration and development, and in particular relates to a method and system for determining the dominant occurrence mode of shale natural gas. Background technique [0002] Natural gas in shale gas reservoirs mainly occurs in two states: free and adsorbed. Among them, the dominant occurrence mode of natural gas is the key factor that determines the economics of exploration and development of shale gas reservoirs, the predicted results of productivity and the actual change law. [0003] At present, the determination of the dominant occurrence mode of shale gas through well logging basically relies on the quantitative evaluation of the content of free and adsorbed natural gas, and by determining the ratio of the two, the dominant occurrence mode of shale gas is determined. However, the various links and key steps involved in the above methods are relatively complicated, and ther...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01V9/00
CPCG01V9/00
Inventor 路菁李军武清钊金武军胡瑶于文芹张爱芹
Owner CHINA PETROLEUM & CHEM CORP