He-Technology for High-Helium deposits prospecting
Helium is extracted from natural gases and is a strategic raw material. It is widely used in space and military industries, nuclear reactors, medical equipment, and metal welding and cutting. The area of helium consumption is constantly expanding, which increases demand, and the stocks of high-quality helium raw materials, although large, are limited.
Reasons for using the He-Technology
Heologic offers a method of in-situ helium survey in order to search for gases with high-helium content (0.1% vol. and more).
The basis for the application of the method is the ability of helium to accumulate in natural gas deposits together with other gases - hydrocarbons, nitrogen, carbon dioxide (helium does not form independent gas accumulations), forming three groups - mainly methane, mainly nitrogen and mainly carbon dioxide high-helium gases.
An important role for the formation of deposits with a high content of helium is played by the presence in the sedimentary cover of high-quality seal rocks that impede or slow down the vertical migration of gas.
Clay caps are not a barrier leading to a significant accumulation of helium in the deposits - the Cenomanian gas deposits of Western Siberia, where the helium content is hundredths and thousandths of a percent.
The highest helium concentrations n * 0.1- n * 1% are associated with free gas deposits overlain by evaporite (interlayering of salts with anhydrite) seals (Western Inner and Michigan oil and gas fields, USA).
However, the high migration ability of helium gas allows it to migrate from the reservoir even through effective seals and form on the surface of the field of helium concentrations above background values.
Helium surveying is a direct method of prospecting for deposits of high-helium gases.
1. Analysis of the geological structure of the area
At this stage, an assessment of the helium potential of the area is given, based on geological characteristics, such as the age of the basement / sedimentary cover, as well as its geotectonic affiliation, the presence of traps in the section, the quantity and quality of seal rocks, and the features of fault tectonics.
The probabilistic prospects for the discovery of a field of helium-bearing gases in this area are estimated.
The most promising objects for setting up work (structures, traps) are determined.
2. Performing in-situ helium survey
Areal in-situ helium survey is performed on selected objects.
Parametric measurements are carried out in the presence of a structure with proven helium content if available.
3. Integration with geological and geophysical materials
The results of helium survey (map of helium anomalies) are integrated with the available geological and geophysical materials, mainly seismic exploration.
There is experience of integration with other methods of geological prospecting, for instance, MT-sounding, Satellite imagery.
As a result of the work, an assessment of the prospects for helium potential of the studied structures is given, the boundaries of predicted deposits of high-helium gases are outlined, and the locations of priority prospecting wells are recommended.
He-Technology is highly efficient in the search for all types of highly helium-bearing gases and greatly de-risks helium gas prospecting projects.