Accumulation characteristics of Dongsheng helium-rich gas field in Ordos Basin and its tectonic background
HE Faqi1, WANG Jie2,3, ZHAO Yongqiang2,3, AN Chuan1, WANG Fubin1, TAO Cheng2,3, NI Chunhua2,3, JIA Huichong1
1 SINOPEC North China Company, Zhengzhou 450006, China; 2 SINOPEC Key Laboratory of Petroleum Accumulation Mechanisms, Jiangsu Wuxi 214126, China; 3 Wuxi Research Institute of Petroleum Geology, SINOPEC, Jiangsu Wuxi 214126, China
Abstract：In recent years,commercial helium associated with natural gas has been discovered in the Upper Paleozoic in Dongsheng gas field,in the northern part of Ordos Basin,with helium content ranging from 0.045% to 0.487%. The 3P reserves of helium gas are about 8.3×108 m3,which is the first supergiant helium-rich natural gas field in China. The helium in Dongsheng gas field belongs to typical crust source,which is derived from the Archaean-Proterozoic metamorphic-granite series in the basement and its enrichment is related to magmatic intrusion and fault activity since the Yanshan Orogeny. Dongsheng gas field has favorable geological conditions for helium accumulation,with helium and natural gas from different sources but accumulated in the same reservoir. The main controlling factors of helium accumulation including the development of U- and Th-rich rocks in the basement,fault activity,good combination of reservoir,cap,trap and preservation,and the temporal-spatial configuration. The most important tectonic-magmatic-thermal event occurred in the Early Cretaceous,and the large-scale upwelling of deep material and heat energy caused by deep magmatic activity was the favorable geodynamic background for the Mesozoic fluid accumulation(mineralization),which controlled the large-scale gas generation of the Carboniferous-Permian coal source rocks in the Ordos Basin. Coupled with the destruction process of the North China Craton,the fault activity and trap formation had a good spatial and temporal relationship with the accumulation of hydrocarbon gas and helium of the Upper Paleozoic. From the early Cretaceous to Miocene,the deep thermal fluid in the Ordos block significantly affected the multiple-period magmatic activity,basement fault reactivation and shallow fault activity,as well as controlled the hydrocarbon generation and accumulation of the Carboniferous-Permian coal type source rocks.
HE Faqi,WANG Jie,ZHAO Yongqiang et al. Accumulation characteristics of Dongsheng helium-rich gas field in Ordos Basin and its tectonic background[J]. JOPC, 2022, 24(5): 937-950.
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