Reservoir characteristics of mudstone(shale)interval in the Qingshankou Formation,QijiaGulong Sag,Songliao Basin,northeast China

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  • (1.Research Institute of Petroleum Exploration and DevelopmentNorthwest(NWGI),PetroChina,Lanzhou 730020,China;
    2.Key Laboratory of Reservoir Description,PetroChina,Lanzhou 730020,China;
    3.Research Institute of Petroleum Exploration and Development,Daqing Oilfield Company,Daqing 163000,China;
    4.No.3 Oil Plant,Sinopec Northwest Company,Luntai 841604,China)

Received date: 2015-04-08

  Revised date: 2015-07-10

  Online published: 2016-02-10

Abstract

Organicrich shale was widely distributed in the Qingshankou Formation,QijiaGulong Sag,Songliao Basin,which shows enormous potential in unconventional oil/gas exploration.Based on core observation,thin section,wholerock Xray diffraction,argon ion polishingSEM analysis,rock pyrolysis analysis,and organic carbon analysis,reservoir characteristics in shale section of the Qingshankou Formation have been studied.According to the study results,the lithology in the study area was dominated by siltstone and shaley siltstone with low organic matter.The clay mineral content of the shale was 6.1% 39.3%, total organic matter content was 0.74%4.23%,and organic matter maturity(R O)was 0.62% 1.19%, which indicate the shale were at lowmature to mature evolution stage.Major reservoir spaces in the shale section include intergranular pores,intracrystalline pores,organic pores,dissolved pores,and microfractures.The abnormal overpressure in the shale section of the QingshankouFormation was contributed to restrain the compaction and cementation,and promote development of dissolution and natural fractures,which were favorable to form “sweet spot” in shale (tight) oil exploration.

Cite this article

Chen Bintao,Pan Shuxin,Fang Lehua,Zhang Qingshi,Li Chenggang,Liang Sujuan . Reservoir characteristics of mudstone(shale)interval in the Qingshankou Formation,QijiaGulong Sag,Songliao Basin,northeast China[J]. Natural Gas Geoscience, 2016 , 27(2) : 298 -308 . DOI: 10.11764/j.issn.16721926.2016.02.0298

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