Method and device for determining gas content of tight reservoirs

A tight reservoir and gas content technology, applied in the field of oil and gas exploration, can solve the problems of large gas content errors in tight reservoirs and the inability to correctly obtain the gas content of tight reservoirs, and achieve the effect of improving calculation accuracy

Active Publication Date: 2018-09-28
PETROCHINA CO LTD
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Problems solved by technology

[0003] In the prior art, the gas content of tight reservoirs is often determined by logging data or adsorption-desorption methods. However, there are often many influencing factors in the logging data, resulting in errors in the gas content of tight reservoirs calculated based on logging data. The adsorption-desorption method mostly focuses on the adsorbed gas content, and the existing technology cannot accurately obtain the gas content of tight reservoirs.

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  • Method and device for determining gas content of tight reservoirs
  • Method and device for determining gas content of tight reservoirs
  • Method and device for determining gas content of tight reservoirs

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[0060] In order to enable those skilled in the art to better understand the technical solutions in the present application, the technical solutions in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described The embodiments are only some of the embodiments of the present application, but not all of them. Based on the embodiments in this application, all other embodiments obtained by persons of ordinary skill in the art without creative efforts shall fall within the scope of protection of this application.

[0061] The specific implementation of the embodiment of the present application will be described in detail below with several specific examples.

[0062] An embodiment of a method for determining the gas content of a tight reservoir in the present application is first introduced below. figure 1 It is a flow chart of an embodiment of the...

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Abstract

The embodiment of the invention provides a method and a device for determining gas content of tight reservoirs. The method comprises the following steps: preparing a plunger sample with first specification and a particle sample with second specification from a sample of tight reservoirs; carrying out an adsorption experiment on the particle sample to obtain a reservoir sample gas-adsorption quantity calculation model including temperature, pressure and rock thermal evolution degree parameters; carrying out porosity and rock density determination on the plunger sample to obtain a free gas quantity calculation model including porosity, density, gas saturation, adsorption gas density, stratum correction factor and methane molecule molar mass; and calculating gas content of the tight reservoirby the utilization of the reservoir sample gas-adsorption quantity calculation model and the free gas quantity calculation model. By the technical scheme provided by the embodiment of the invention,gas content of the tight reservoirs can be accurately determined so as to provide data support for accurate evaluation of unconventional natural gas resource quantity.

Description

technical field [0001] The invention relates to the technical field of oil and gas exploration, in particular to a method and a device for determining the gas content of tight reservoirs. Background technique [0002] In the process of oil and gas exploration, unconventional natural gas is one of the main sources of oil and gas extraction. Unconventional natural gas mainly includes shale gas, coalbed methane and tight sandstone gas, which are important natural gas resources. Accurate measurement and calculation of gas content in tight reservoirs is a key parameter for correct evaluation of unconventional natural gas resources. [0003] In the prior art, the gas content of tight reservoirs is often determined by logging data or adsorption-desorption methods. However, there are often many influencing factors in the logging data, resulting in errors in the gas content of tight reservoirs calculated based on logging data. However, the adsorption-desorption method mostly focuses...

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Application Information

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IPC IPC(8): G01N7/14G01N15/08G01N9/00
CPCG01N7/14G01N9/00G01N15/088
Inventor 马行陟柳少波赵孟军鲁雪松田华卓勤功孟庆洋范俊佳
Owner PETROCHINA CO LTD
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