Volume 26 Issue 6
Dec.  2020
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Article Contents
ZHENG Hongjun, ZHOU Daorong, YIN Qichun, et al., 2020. New progress and breakthrough difficulties on shale gas geological survey in the lower Yangtze area. Journal of Geomechanics, 26 (6): 852-871. DOI: 10.12090/j.issn.1006-6616.2020.26.06.067
Citation: ZHENG Hongjun, ZHOU Daorong, YIN Qichun, et al., 2020. New progress and breakthrough difficulties on shale gas geological survey in the lower Yangtze area. Journal of Geomechanics, 26 (6): 852-871. DOI: 10.12090/j.issn.1006-6616.2020.26.06.067

New progress and breakthrough difficulties on shale gas geological survey in the lower Yangtze area

doi: 10.12090/j.issn.1006-6616.2020.26.06.067
More Information
  • Received: 2020-08-25
  • Revised: 2020-10-20
  • Published: 2020-12-01
  • Shale gas breakthroughs are in urgent need in the construction of clean energy system in the Yangtze River Economic Belt. The previous geological and geophysical data in the lower Yangtze area were fully integrated,and a 1:250000 shale gas geological survey was systematically carried out in the lower Yangtze area. Ten shale gas wells were drilled in the "two belts and one zone",which includes the depression belt along the Yangtze River in the southern regions of Jiangsu and Anhui,the Jiangxi Pingle-Zhejiang Qiantang depression belt,and the southern North China zone. The geological accumulation conditions of organic-rich shales in the Permian,Silurian,Ordovician and Cambrian were basically identified. Among those formations,"three types of gas and three types of oil",including shale gas,tight sandstone gas,coal bed gas,shale oil,fractured sandstone oil and fractured limestone oil,were discovered from nine wells. The great discoveries deepened our understanding of Permian and Silurian hydrocarbon accumulations. The hydrocarbon-bearing properties of the Triassic,Ordovician and Cambrian were explored. Meanwhile,the new zones and layers were established and the potential for hydrocarbon and shale gas exploration were revealed in the lower Yangtze and southern North China in the Meso-Palaeozoic. In the research,ten shale gas prospecting areas were delineated. The preliminary evaluation of the prospective resources of the main target layers in nine shale gas prospecting areas was completed and the problems of resource prospects were solved. At last the bottlenecks in the lower Yangtze shale gas exploration were discussed and the direction of breakthrough was put forward.

     

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