A shale gas content assessment method based on methane carbon isotope
A technology of shale gas content and carbon isotope, which is applied in the field of petroleum engineering and can solve problems such as difficulty in consistency
Active Publication Date: 2020-04-21
INST OF MECHANICS CHINESE ACAD OF SCI
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Problems solved by technology
There are problems with the indirect method: it is difficult to ensure that the actual formation conditions are consistent with the actual formation conditions during the actual measurement of adsorption and desorption, and the rock core is ground into powder during the test, which is also different from the actual situation
Method used
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Embodiment 1
[0169] Step 1: Carry out the on-site analysis experiment of cuttings. The test time is 72 hours, and the isotope value of the analysis gas is measured at the time points of 1 hour, 6 hours, 12 hours, 24 hours, 48 hours and 72 hours. Obtain isotope value versus time curves.
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Abstract
The invention provides a method for assessing content of gas in shale based on methane carbon isotope, which estimates relevant parameters by matching of experimental results and calculations, and utilizes the change of methane carbon isotope value during desorption and deflation of shale gas to establish a corresponding relationship with the gas recovery rate during the deflation to achieve the calculation of a total gas volume. On the one hand, the method can calculate a lost gas volume, a desorbed gas volume and a residual gas volume, and on the other hand, can calculate a free gas volume and an adsorbed gas volume. On the one hand, the isotope fractionation provided by the invention can calculate a lost gas, a desorbed gas, and a residual gas; and on the other hand, can calculate a free gas and an adsorbed gas.
Description
technical field [0001] The invention relates to the field of petroleum engineering, in particular to a method for characterizing the analysis process by fractionation of methane carbon isotopes when evaluating shale gas content. Background technique [0002] Shale gas is a natural gas reservoir accumulated in source rocks, which has the typical characteristics of "self-generation and self-storage", and mainly occurs in shale in the form of adsorption and dissociation. Among them, the adsorbed gas content is between 20% and 85% (50% on average), which is an important part of shale gas and determines the gas content in shale to a large extent. Although organic-rich shale formations may contain gas extensively, only when the gas content in the formation reaches a certain level (for example, the lower limit of gas content in the United States is 0.5m 3 / t-1.0m 3 / t) and form relative enrichment, it has industrial development value. If the gas content in the shale formation is...
Claims
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IPC IPC(8): G01N33/24
CPCG01N33/24
Inventor 曹高辉林缅江文滨姬莉莉
Owner INST OF MECHANICS CHINESE ACAD OF SCI