Geological Accumulation Conditions for Linxi Formation Shale Gas in Southeastern Inner Mongolia

JING Tie-ya，ZHANG Jin-chuan，SUN Rui，ZHANG Jian，ZHOU Tie-suo，HUANG Xiao

doi:10.11764/j.issn.1672-1926.2014.08.1290

Natural Gas Geoscience >

2014 , Vol. 25 >Issue 8: 1290 - 1298

DOI: https://doi.org/10.11764/j.issn.1672-1926.2014.08.1290

Geological Accumulation Conditions for Linxi Formation Shale Gas in Southeastern Inner Mongolia

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1.Huaneng Clean Energy Research Institute,Beijing 102209,China; 2.School of Energy Resources,China University of Geosciences (Beijing),Beijing 100083,China; 3.Research Institutes of Exploration and Development of Liaohe Oilfield Company,Panjin 124010,China

Received date: 2013-11-01

Revised date: 2014-03-17

Online published: 2014-08-10

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Abstract

Southeastern Inner Mongolia is a new region for petroleum exploration,where developed massive dark shale in Linxi Formation in Neopaleozoic.The overall thickness of Linxi shale can exceed 700m and the maximum thickness distributed in Taohaiyingzi to the east and Guandi to the west.The kerogen type is Ⅱ₂-Ⅲ and the organic richness is moderate with average TOC mainly between 0.5%-1.0%.TOC over 1.5%only exists regionally.The thermal maturity is high with vitrinite reflectance (R_O) over 2.0% and the shale is at late diagenetic stage according to the analysis of illite crystallinity.The erosion pores,intergranular pores and organic pores can be observed with the optical microscope or SEM.Brittle minerals such as quartz and plagioclase dominate and clay consisting of mainly illite and mixed-layer illite/smectite is less than 40%.Overall,shale gas potential for Linxi shale exists and the favored regions for shale gas accumulations locate on Kundu-Zhalute areas.However,more materials such as gravity,magnetism and electrical methods are needed when it comes to next step exploration.

Key words： Southeastern Inner Mongolia; Linxi Formations; Shale gas; Accumulation conditions; Favorable areas

Cite this article

JING Tie-ya，ZHANG Jin-chuan，SUN Rui，ZHANG Jian，ZHOU Tie-suo，HUANG Xiao . Geological Accumulation Conditions for Linxi Formation Shale Gas in Southeastern Inner Mongolia[J]. Natural Gas Geoscience, 2014 , 25(8) : 1290 -1298 . DOI: 10.11764/j.issn.1672-1926.2014.08.1290

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