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Main controlling factors on normal pressure shale gas enrichmentsin Wufeng-Longmaxi Formations in synclines,southeastern Sichuan Basin

Hu Dong-feng   

  1. Sinopec Exploration Company,Chengdu 610041,China
  • Received:2018-11-08 Revised:2019-01-30 Online:2019-05-10

Abstract: The synclines develop well in transferring belt from wide spaced synclines to anticlines at the edge of southeastern Sichuan Basin and in the belt of wide spaced synclines outside Sichuan Basin.Due to the uplifting for long time,serious structural movements and great amount of erosion,the regional preservation condition is complex,there exists great differences in gas contents in Wufeng-Longmaxi Formations in various anticlines.On the basis of studies on the features of shales from Wufeng-Longmaxi Formations,preservation conditions and gas contents in anticlines,the article analyzes the main controlling factors on shale gas enrichments in anticlines and makes a conclusion on structural patterns favorable for shale gas preservation and enrichments.The studies show that quality shales are the bases for shale gas,and the quality shales either at the edge of Sichuan Basin or out of Sichuan Basin have similar hydrocarbon rock conditions;preservation condition is the key for gas contents in shales,great depth of shale layers,small dip angle of strata,great distance away from eroded areas and developed over-thrusting faults are favorable for the preservation of shale gas.All in all,the preservation conditions of synclines in transferring belt from wide spaced synclines at the edge of Sichuan Basin are better than that of the belt of wide spaced synclines out of Sichuan Basin.Three kind of structural patterns as uplifts develop in synclines in transferring belt from wide spaced synclines to anticlines,the central part of wide gentle synclines and the synclines covered by over-thrusting faults are favorable for shale gas enrichments.

Key words: Southwestern Sichuan Basin, Synclines structure, Lateral dispersion, Preservation conditions, Enrichment rules

CLC Number: 

  • TE122.2
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