Source Rock and Cap Rock Controls on the Upper Ordovician Wufeng Formation-Lower Silurian Longmaxi Formation Shale Gas Accumulation in the Sichuan Basin and its Peripheral Areas

• Published in: Acta geologica Sinica (Beijing) 2016-06, Vol.90 (3), p.1059-1060
• Main Authors: Haikuan, NIE, Zhijun, JIN
• Format: Article
• Language: English
• Subjects: 上奥陶统; 下志留统; 周边地区; 四川盆地; 成藏; 烃源岩; 页岩气; 龙马溪组
• ISSN: 1000-9515; 1755-6724
• DOI: 10.1111/1755-6724.12752

Objective The Upper Ordovician Wufeng Formation-Lower Silurian Longmaxi Formation is one of the priority interval for shale gas exploration in the Sichuan Basin and its peripheral areas, and commercial shale gas has been discovered from this interval in Jiaoshiba, Changning and Weiyuan shale gas fields in Sichuan Province. However, there is no significant discovery in other parts of the basin due to the different quality of black shale and the differences of tectonic evolution. Based on the progress of shale gas geological theory and exploration discoveries, as well as the theory of ＂source rock and cap rock controls on hydrocarbon accumulation＂, of the Upper Ordovician the main controlling factors Wufeng Formation-Lower Silurian Longmaxi Formation shale gas enrichment in the Sichuan Basin and its peripheral areas were analyzed, and the source rock and cap rock controls on the shale gas were also discussed. The results can provide new insights for the next shale gas exploration in this area.