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针对长岭气田登娄库组气藏初期生产气井由纯烃类天然气变为含CO2天然气的这一现象,开展研究长岭气田登娄库组气藏是否含CO2,经过研究认为其气藏成藏并不含CO2,而是水平井大型压裂过程中沟通了上层含CO2的营城组气藏,使登娄库组气藏气井生产也含有CO2。为了证明这一问题,从长岭气田的地质,再到动态动态进行了全面分析论证,来确定登娄库组气藏的CO2来自营城组气藏。
In view of the fact that the initial production gas wells of Denglouku Group in Changling Gas Field changed from pure hydrocarbon natural gas to natural gas containing CO2, the paper studies whether the gas in Denglouku Formation in Changling Gas Field contains CO2 and after research, The reservoir does not contain CO2. Instead, the large-scale fracturing of the horizontal well communicates with Yingcheng Group gas reservoirs containing CO2 in the upper layer and CO2 gas in the Denglouku Formation gas well. In order to prove this problem, a comprehensive analysis is carried out from the geology of Changling gas field to the dynamic dynamics to confirm that the CO2 of Denglouku Group gas reservoir comes from the Yingcheng Formation gas reservoir.