Study on the effect of pyrite on the accumulation of shale oil and gas

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  • 1.Hunan Provincial Key Laboratory of Shale Gas Resource Utilization,
    Hunan University of Science and Technology,Xiangtan 11201,China;
    2.Wuxi Research Institute of Petroleum Geology,SINOPEC,Wuxi 21126,China;
    3.Guangzhou Institute of Geochemistry,Chinese Academy of Sciences,Guangzhou 51060,China

Received date: 2017-09-08

  Revised date: 2017-11-30

  Online published: 2018-03-10

Abstract

Pyrite is widely distributed in organic matter rich mudstones,which is regarded as an indicator mineral of sedimentary and diagenetic environment.However,the study on the effect of pyrite on shale oil and gas accumulation is relatively poor.The study on the morphologies of pyrite in organic-rich shales from Yangtze region and Maoming Basin reveals that (1)pyrite framboid in shales formed in hydrostatic deep-water shelf and basin facies is plentiful and has a small size,(2)the shale formed in oxygenic semi-deep to deep facies has a large number of large-sized framboid pyrites,and (3)there is few or no pyrite in shale formed in shoreland-swamp and shallow shelf environments.Pyrite has positive correlations with TOCand liquid hydrocarbon (S1)contents,reflecting that the formation and content of pyrite is closely related to organic matter and pyrite could promote the pyrolysis and cracking of organic matter.Abundant organic pores are developed in the organic/pyrite assemblages,which could significantly increase the specific surface area and then increase methane sorption capacity of shale.A large amount of intergranular pores in pyrite framboids and their surface areas and the moldic pores related to the dissolution of the pyrites are able to provide large space for liquid hydrocarbon and free gas.Therefore,the pyrite,especially framboid pyrite,is an important factor of the evolution of organic matter and hydrocarbon accumulation in shale reservoir,and the favorable area of shale gas could be predicted according to the distribution of pyrite in vertical and horizontal directions.

Cite this article

Cao Tao-tao,Deng Mo,Song Zhi-guang,Liu Guang-xiang,Huang Yan-ran,Andrew Stefan Hursthouse . Study on the effect of pyrite on the accumulation of shale oil and gas[J]. Natural Gas Geoscience, 2018 , 29(3) : 404 -414 . DOI: 10.1176/j.issn.1672-1926.2017.12.006

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