Soil gas collecting device used for high-precision geochemical exploration

Abstract

The invention relates to the technical field of oil gas geochemical exploration, in particular to a soil gas collecting device used for high-precision geochemical exploration. The soil gas collectingdevice used for high-precision geochemical exploration comprises an external protection layer, an intermediate water blocking layer and an internal gas capturing core which are arranged from outside to inside in sequence, wherein the external protection layer comprises an outer cylinder; small outer cylinder holes for gas and liquid to flow through are formed in the outer cylinder; and the intermediate water blocking layer comprises a first water blocking outer protection layer, a waterproof protection film and a second water blocking outer protection layer which are arranged from outside to inside in sequence. The soil gas collecting device used for high-precision geochemical exploration is simple in structure, small in size and convenient to store and carry, and can be applicable for various soil conditions; gas samples inside soil, particularly hydrocarbon gas inside soil, can be collected effectively, and the precision of geochemical exploration is improved.

Description

technical field [0001] The invention relates to the technical field of oil and gas geochemical exploration, in particular to a soil gas collection device for high-precision geochemical exploration. Background technique [0002] After oil and gas are formed deep underground, oil and gas pools are formed in traps after migration. During oil and gas migration or after accumulation, oil and gas will dissipate until they are lost to the surface. The escape of oil and gas to the surface along open faults becomes macro seepage. However, the oil and gas in the oil and gas reservoir, due to the effect of cap rock or other sealing bodies, has a very small seepage amount, which is called micro seepage. The micro-leakage of oil and gas to the surface will cause a series of physical and chemical changes in the crust and near the surface. According to these changes, many scholars have invented some geochemical methods for oil and gas exploration, and some successful cases have been obta...

AI Technical Summary

Problems solved by technology

However, these methods have not been popularized and applied due to the lack of a good solution to the acquisition of hydrocarbon gases in the soil.

[0004] Since the amount of hydrocarbon gas micro-leakage to the surface is very small, there are great difficulties in collecting

Although KOV technology and adsorption filament technology have solved the problem of hydrocarbon gas collection under certain specific conditions, they cannot be effectively applied in most soil conditions, especially when the soil contains a lot of water, the above methods are completely ineffective

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