Lithologic Reservoirs ›› 2017, Vol. 29 ›› Issue (4): 47-54.doi: 10.3969/j.issn.1673-8926.2017.04.006

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Shale gas accumulation conditions of Neoproterozoic Doushantuo Formation in NW Hunan province

PENG Bo1, LIU Yuchen2, QI Fucheng1, WANG Zhenyun1   

  1. 1. CNNC Beijing Research Institute of Uranium Geology, Beijing 100029, China;
    2. Bureau of Geophysical Prospecting INC., CNPC, Zhuozhou 072750, Hebei, China
  • Received:2017-12-28 Revised:2017-03-12 Online:2017-07-21 Published:2017-07-21

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Abstract: Shale of the Neoproterozoic Doushantuo Formation is widely developed in Northwestern Hunan province. With better gas show in shale gas wells,it revealed better gas potential of the Doushantuo Formation shale. Based on outcrop observation,combined with analysis of organic geochemical test, SEM, X-ray diffraction, low-temperature nitrogen adsorption-desorption and isothermal adsorption,the accumulation conditions and characteristics of shale gas of the Neoproterozoic Doushantuo Formation were studied. The results show that the shale development in the study area is not uniform,and the relatively large cumulative depositional thickness is 20-50m in Dayong syncline. The TOC mass fraction of shale is 0.5%-3.0%,the organic matter is mainly type Ⅰ, and the Ro is 3%-4%,which has reached over-mature evolution stage,with favorable conditions for gas generation. The reservoir minerals of shale are mainly of brittle minerals,with mass fraction of 21.0%-78.7%. The various types of pore spaces developed in shale support high specific surface area and pore volume. The maximum methane absorbance is 0.80-1.77 m3/t. All of the characteristics of shale mean the advantageous geological conditions of shale gas enrichment and accumulation. With steady tectonic setting, favorable preservation conditions and advantageous shale gas accumulation conditions, Dayong syncline is favorable for shale gas exploration.

Key words: sequence framework, nearshore subaqueous fan, braided delta, A'ershan Formation, Honghaoershute Sag

CLC Number: 

  • TE121
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