Calculation method and geological significance of dissolved and exsolved helium in pore water

被引：0
|
作者：
Zhao D. [1 ,2 ]
Wang X. [1 ]
Liu W. [1 ,3 ]
Zhang D. [1 ]
Li X. [1 ]
Zhang J. [1 ]
机构：
[1] State Key Laboratory of Continental Dynamics, Northwest University, Shaanxi, Xi'an
[2] Laboratory Management Office-Experimental Center, Xi'an Shiyou University, Shaanxi, Xi'an
[3] Sinopec Exploration & Production Research Institute, Beijing
来源：
Natural Gas Industry | 2023年 / 43卷 / 02期
关键词：
Accumulation model; Amount of dissolved helium; Amount of exsolved helium; Bunsen coefficient; Granite; Helium; Solubility; Tectonic uplift;
D O I：
10.3787/j.issn.1000-0976.2023.02.016
中图分类号：
学科分类号：
摘要：
The classical helium accumulation theory emphasizes the "extraction" and "carrying" of dissolved helium in the rock pore water by external fluids (such as CH4 and N2), without giving full consideration how the change of the occurrence environment of in-situ dissolved helium (especially the formation temperature and pressure changes caused by tectonic uplift) influences Helium migration and accumulation, so this theory has a certain limitation in helium resource evaluation and development. In this paper, Bunsen coefficient is used to calculate helium solubility under formation conditions. Based on this, a model for calculating the amount of dissolved and exsolved helium in rock pore water is established by taking the unit volume (1 km3) of granite as an example. Then, the correlation between the changes of formation temperature and pressure and the helium migration and accumulation is researched qualitatively and quantitatively. And the following research results are obtained. First, the helium solubility in the formation condition is extremely small and varies in a wide range, and its change is mainly under the joint influence of reservoir depth and helium molar partial pressure, which usually increases with the increase of burial depth and partial pressure. Second, the decrease of formation temperature and pressure caused by large tectonic uplift can lead to the large-scale continuous exsolution of in-situ dissolved helium, thus providing sufficient free helium source for the formation of helium-rich gas reservoirs. Third, the 4He generated and accumulated in massive granites for a long time can be exsolved and released from the pore water under proper conditions. In conclusion, the accumulation models of crust-sourced helium-rich natural gas reservoirs are summarized as "uplift-exsolution type" and "replacement-exsolution type" by taking the occurrence of large-scale tectonic uplift in the exsolution and enrichment process of pore dissolved helium as the basis. © 2023 Natural Gas Industry Journal Agency. All rights reserved.
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页码：155 / 164
页数：9
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