Stylolite occurrence and organic matter enrichment of the mixed sediments in the Lucaogou Formation of the Jimusaer Sag in Junggar Basin

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  • 1.State Key Laboratory of Petroleum Resource and Prospecting,China University of Petroleum,Beijing 102249,China;
    2.Experimental Testing Institute,Xinjiang Oil Field Company,Karamay 834000,China;
    3.Geophysical Exploration Research Institute of HuaBei Oilfield Company,Renqiu 062552,China

Received date: 2016-07-25

  Revised date: 2016-08-21

  Online published: 2019-09-09

Abstract

There are a large number of organic matter and stylolites in the mixed sediments of the Lucaogou Formation in the Jimusaer Sag of Junggar Basin.Based on the core observation of the Lucaogou Formation in the Well Jy74 etc.,there are not only fractures but also stylolits in the rock,but the stylolits are distributed at a lower degree.The saw-toothed stylolites have bigger variation amplitude,relation with pure pressure solution,larger distribution scope and can cut across rock bedding;and the undulating stylolites have smaller variation amplitude,longer or shorter strengthen scope,and are formed by pressure solution role on the basis of rock bedding plane.It is advantageous of the combination of stylolite and fracture to petroleum migration.Based on the contrast of organic matter abundance with mineral composition and the rock distribution with stylolites and without stylolites in Well Jy74,there are not obvious relation between stylolite formation and organic matter abundance,and carbonate content;there are more factors to control organic matter enrichment of the mixed sediments,more migrated hydrocarbons in the sandstones,dolomites,and limestones,and more residual hydrocarbons in the shales;a part of dolomites,sandstones and limestones contain original organic matter of different degrees and have hydrocarbon-generating potential,but the shales have the strongest hydrocarbon generation capacity.

Cite this article

Gao Gang, Xiang Bao-li, Wang Xuan, Wang Yi, Zhou Ran-ran, Ma Wan-yun, Ren Jiang-ling, Zhao Ke . Stylolite occurrence and organic matter enrichment of the mixed sediments in the Lucaogou Formation of the Jimusaer Sag in Junggar Basin[J]. Natural Gas Geoscience, 2016 , 27(11) : 1963 -1969 . DOI: 10.11764/j.issn.1672-1926.2016.11.1963

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