Significance of Discovery of Shale Gas From Well YQ-1 in Northern
Yunnan-Guizhou Provinces，China

doi:10.11885/j.issn.1674-5086.2014.04.30.04

Abstract

Abstract:

The high quality shale of Wufeng-Longmaxi formations that was encountered by well YQ-1 during the drilling process
is characterized by thick single layer，high TOC content，high organic matter maturity，and well developed microscopic
pore and cracks. The analysis results reveal that the absorbed methane content of core shale from well YQ-1 increases with
the rise of burial depth，formation pressure，content of organic matter and clay minerals. The gas in place（GIP）of the shale
reservoirs ranges from 1.0 to 3.0 m3/t，indicating that the shale horizon of the basal of Longmaxi formation and Wufeng formation
is the first target stratum with commercial development value. The marine gas shale in Southern China is characterized of
“intensive reformation，and high maturity”，and because the occurrence of shale gas resources is characterized by the control
factors on distribution，gas pool，and sweet pot that are controlled by tectonics，storage condition and physical properties of
rocks respectively. The emergency mission on shale gas exploration is to identify the sweet spot areas that are characterized by
organic richness，abnormal formation pressure，and good development of brittle microscopic pore and cracks. The sweet spots
of marine shale gas often develop in broad syncline far from faults that reach the surface and is of weak tectonic deformation，
good cap rock. The strategy of marine shale gas exploration and development in Southern China should follow the sequences
of filtering sweet spots firstly，and then setting demonstration area，finally carrying out large-scale development.

Key words: northern YunNan-Guizhou provinces, shale gas, Longmaxi Formatiom, shale gas occurrence, evalution and
selective preference

Liang Xing, Ye Xi, Zhang Zhao, Zhang Jiehui, Shu Honglin. Significance of Discovery of Shale Gas From Well YQ-1 in Northern
Yunnan-Guizhou Provinces，China[J]. 西南石油大学学报(自然科学版), DOI: 10.11885/j.issn.1674-5086.2014.04.30.04.

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