The Characteristics and Controlling Factors of VolcanicWeathering Reservoir in Ludong Region,Junggar Basin

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  • 1.Key Laboratory of Petroleum Resources Research,Chinese Academy of Sciences,Lanzhou 730000,China;
    2.Graduate University of Chinese Academy of Sciences,Beijing 100049,China;
    3.Research Institute of Exploration and Development,Xinjiang Oilfield Company,PetroChina,Karamay 834000,China

Received date: 2013-04-06

  Revised date: 2013-06-06

  Online published: 2013-12-10

Abstract

The Carboniferous volcanic rocks are an important new field for oil/gas exploration in the deep strata of western China.Great prospects have been proved in the volcanic rocks of Junggar Basin.This paper focused on the characteristics and controlling factors of volcanic rock reservoirs in Ludong area of the eastern Junggar Basin,based on microscopic observation,scanning electron microscopy.Additional samples were collected from the outcrop in eastern basin for geochemical analysis and temperature test of inclusions to establish the process of reservoir spaces.During the Later Carboniferous,the study area developed a suit of low potassium sodium alkali-rich and alkaline volcanic rocks,which mainly consisted of eruption (volcanic breccia and tuff) and overflow (basalt and andesite) facies volcanic rocks.Volcanic rock reservoir spaces are mainly secondary dissolution pores and fractured pores,and the reservoirs with best property are eruption facies volcanic breccia and overflow facies basalt,andesite physical.The favorable reservoir zone consisted mainly of weathered eluvial horizon,followed by collapse zone.The reservoirs in each zone were developed by weathering and leaching,tectonic fracture and hydrothermal alteration,especially the hydrothermal alteration which formed zeolite or calcite filling has important significance to the reservoir.The Carboniferous volcanic rock reservoirs in the study region are mainly controlled by the fracture distribution,and the weathering structure and lithology for the second and third controlling factors respectively.

Cite this article

ZHANG Sheng-yin,LIU Shuang-quan,ZHANG Shun-cun,REN Ben-bing,SHI Ji-an . The Characteristics and Controlling Factors of VolcanicWeathering Reservoir in Ludong Region,Junggar Basin[J]. Natural Gas Geoscience, 2013 , 24(6) : 1140 -1150 . DOI: 10.11764/j.issn.1672-1926.2013.06.1140

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