Deep Basin Gas Accumulation in the Upper Triassic of Chuxiong Basin

ZHANG Jin-liang; CHANG Xiang-chun; LIU Bao-jun

Depositional settings of the upper Triassic of Chuxiong basin are f aVorable f or the deep basin gas accumulation. The fluVial and deltaic deposits constitute the dominated reserVoir in the deep basin. The numerous and mature coal beds and organic-rich shales associated inti mately With reserVoir rocks throughout the deep basin pro-Vide a prereCuisite f or deep basin gas accumulation. Gas has the tendency to be trapped in the deepest part of the basin and probably occupies loW per meability reserVoirs extensiVely. Gas generated in source rocks,moVed into the adj acent sand layer and then sloWly migrated updi p. The filling process of deep basin gas asted fromthe late Cretaceous to mid- Tertiary time. Gas may be located doWndip of an aCuifer Which outcrops in basin margins. The gas accumulation of the upper Triassic of Chuxiong basin is predicted and interpreted based on the trapping mechanism of deep basin gas reserVoir. The distribution of deep basin gas accumulation in the basin is descri bed according to the key parameters controlling the ulti mate trapping.

1 Ocean University of Qingdao,Qingdao Shandong,266003;

2 Shandong University of Science and Technology,Qingdao Shandong,266500

Received Date: 2001-06-22

Rev Recd Date: 2001-10-11

Key words:

Abstract: Depositional settings of the upper Triassic of Chuxiong basin are f aVorable f or the deep basin gas accumulation. The fluVial and deltaic deposits constitute the dominated reserVoir in the deep basin. The numerous and mature coal beds and organic-rich shales associated inti mately With reserVoir rocks throughout the deep basin pro-Vide a prereCuisite f or deep basin gas accumulation. Gas has the tendency to be trapped in the deepest part of the basin and probably occupies loW per meability reserVoirs extensiVely. Gas generated in source rocks,moVed into the adj acent sand layer and then sloWly migrated updi p. The filling process of deep basin gas asted fromthe late Cretaceous to mid- Tertiary time. Gas may be located doWndip of an aCuifer Which outcrops in basin margins. The gas accumulation of the upper Triassic of Chuxiong basin is predicted and interpreted based on the trapping mechanism of deep basin gas reserVoir. The distribution of deep basin gas accumulation in the basin is descri bed according to the key parameters controlling the ulti mate trapping.

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Reference (19)

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Deep Basin Gas Accumulation in the Upper Triassic of Chuxiong Basin

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