China Petroleum Exploration ›› 2018, Vol. 23 ›› Issue (3): 47-55.DOI: 10.3969/j.issn.1672-7703.2018.03.006

• PETROLEUM GEOLOGY • Previous Articles     Next Articles

ESR dating method of hydrocarbon inclusions-hosting minerals and its application in timing of hydrocarbon accumulation: a case study of Cambrian-Ordovician reservoirs in the northern Tarim Basin

Zhang Yan, Tian Zuoji, Wu Yiping   

  1. PetroChina Research Institute of Petroleum Exploration & Development
  • Received:2017-02-14 Revised:2018-01-11 Online:2018-05-15 Published:2018-05-15
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Abstract: The Electron Spin Resonance (ESR) dating method introduced into petroleum geology recently can detect the crystallization age of mineral grains such as the quartz hosting primary hydrocarbon inclusions, based on the correlation of paramagnetic center concentration with mineralization age and the content of radioactive elements. The hydrocarbon accumulation periods in the northern Tarim Basin were identifed based on microscopic observation of rock samples taken from the northern Tarim Basin, ESR dating results of quartz vein samples with primary hydrocarbon inclusions in different stages, and previous K-Ar dating results of authigenic illite samples. The results show that hydrocarbon accumulation in the northern Tarim Basin were developed in four periods. The frst primary hydrocarbon inclusions are liquid with brown fluorescence, and generated in 376Ma (Late Caledonian to Early Hercynian). The second are liquid with yellow fluorescence, and generated from 293.49 to 242.0Ma (Late Hercynian). The third are gas-liquid with blue fluorescence, and generated from 49 to 32.8Ma (Early Himalayan stage. The fourth are local gas inclusions in black, and generated from 24.0 to 8.5Ma(Late Himalayan).

 

Key words: ESR dating, hydrocarbon accumulation period, hydrocarbon inclusions, Cambrian-Ordovician, northern Tarim Basin

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