Helium geological conditions and accumulation model of the Huanglong natural gas field,Ordos Basin
The Ordos Basin has the properly geological conditions in helium-rich natural gas and high helium resource potential,but there is a lack of in-depth analysis of the geological conditions,formation process and mechanism of helium for the Huanglong natural gas field(hereinafter referred to as Huanglong gas field).Based on literature research,core logging,logging analysis,natural gas component and isotope testing,this paper evaluated the geological conditions of Huanglong gas field and then established a helium formation model.The results show that the helium content in Huanglong gas field is high in the south and low in the north,with a peak helium content of 0.226%in the south and 0.168%in the north.The helium content decreases gradually to the east and faster to the west.There are crystalline metamorphic basement and the high uranium and thorium abundance in mudstone and bauxite for-mations,which are presumed to be potential helium source rock.The basement fracture,the widespread reverse faults and the tec-tonic fractures are all advantageous channels for helium transportation.The abundant stratigraphic water and pore water provide migratory carrier for helium transportation.There are well confined cap layers such as mudstones,muddy carbonates,muddy hard gypsums,also there are regional cap layers with high residual pressures.In conclusion,the mode of helium reservoir formation is the helium degassing from the groundwater.The understanding of helium distribution and the formation mechanism of helium in Huan-glong gas field has certain theoretical value and practical significance for helium exploration and development in Ordos Basin.
Ordos BasinHuanglong gas fieldheliumnatural gasaccumulation model
NETL
NSTL
万方数据
