Pore Types and Characteristics of Continental Shale and Discussion on the Process of Oil and Gas Accumulation:A Case Study of the Western Sag of Liaohe Depression

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  • 1.School of Energy Resources,China University of Geosciences,Beijing 100083,China;
    2.National Experimental Teaching Demonstration Center of Geological Resources Exploration,Beijing 100083,China;
    3.Research Institute of Exploration and Development,Liaohe Oilfield Company,PetroChina,Panjin 124010,China

Received date: 2014-12-01

  Revised date: 2015-01-02

  Online published: 2015-07-10

Abstract

Based on core description,ion beam-scanning electron microscope (FIB-SEM),pore types and characteristics of different scale of continental shale which is represented by the western sag of Liaohe Depression were studied,and the accumulation process of shale oil and gas in the pores was discussed.The results show that the development of large pores like dissolution pores and cracks,tectonic cracks helps the accumulation and migration of oil in the study interval.What's more,inorganic mineral pore,organic pore and micro-cracks were discovered by FIB-SEM,and the formation of the large organic pores is related to the dissolution of the organic acid in the condition of low maturity.Meanwhile,the results show that a variety of micro-cracks are developed in the edge and internal of the organic matter.The extensive development of organic internal cracks is actually the main difference between low maturity continental shale and southern high maturity marine shale.The continental organic in the study area is in the peak of oil generation with a large number of natural gases,and the oil and gas existed at the same time so that the accumulation mechanism is relatively complex.The inner and outer surface of organic and clay plays an important role in the storage of absorbed shale gas,and the dissolved shale gas is mainly stored in the crude oil.The oil-carried gas fills the pores in the shale interval which shares a high oil and gas saturation.Finally,the migration processes are divided into four stages,i.e.,bio-gas accumulation,oil and gas micro accumulation,oil and gas macro accumulation and shale interval accumulation.

Cite this article

HUANG Xiao,ZHANG Jin-chuan,LI Xiao-guang,SUN Rui,PENG Jian-long,LONG Shuai . Pore Types and Characteristics of Continental Shale and Discussion on the Process of Oil and Gas Accumulation:A Case Study of the Western Sag of Liaohe Depression[J]. Natural Gas Geoscience, 2015 , 26(7) : 1422 -1432 . DOI: 10.11764/j.issn.1672-1926.2015.07.1422

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