Geological Characteristics of Wufeng-Longmaxi Formations in Southern Chongqing-Northern Guizhou Area

doi:10.11885/j.issn.1674-5086.2016.06.07.01

Abstract

Abstract: Through observation of outcrop, drilling core and the organic-rich mudstone in Wufeng-Longmaxi, and with organic geochemistry, microscopic section, X-ray diffraction, pore permeability, specific surface area, and scanning electron microscope, we analyzed the basic geological characteristics of shale gas reservoir in Wufeng-Longmaxi formation. The analysis shows that the Wufeng-Longmaxi shelf environment is the foun-dation of organic rich mud shale. The sedimentary pattern of shallow shelf and deep water shelf determines the mudstone distribution which is thin in the South(10-80 m). Deepwater mudstone average organic carbon content is greater than 2.0%, and the organic matter is of type I kerogen of sapropel type, with high degree of maturity(R_o=0:82%-3.04%). The reservoir is of low porosity and low permeability, with various micro pore structures.Through shale gas block assessment and selection, we conclude that the Anchang-Daozhensyncline area is of favorable geological conditions for shale gas enrichment and has a good prospect for shale gas exploration.

Key words: Southern Chongqing-northern Guizhou, Wufeng-Longmaxi formations, organic-rich mudstone, shale gas geological condition

CLC Number:

TE132

KANG Jianwei, YU Qian, YAN Jianfei, SUN Yuanyuan, QI Minghui. Geological Characteristics of Wufeng-Longmaxi Formations in Southern Chongqing-Northern Guizhou Area[J]. 西南石油大学学报(自然科学版), 2016, 38(6): 49-60.

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