Discussion on quartz dissolution and its mechanisms of the Upper Paleozoictight gas reservoirs in the eastern Ordos Basin

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  • 1.State Key Laboratory of Continental Dynamics/Department of Geology,Northwest University,Xi’an 710069,China;
    2.Changqing Oilfield Company,PetroChina,Xi’an 710018,China

Received date: 2015-11-24

  Revised date: 2016-08-22

  Online published: 2019-09-09

Abstract

The Upper Paleozoic tight gas reservoirs in the eastern Ordos Basin are mainly composed of lithic quartz sandstones and quartz sandstones,with overall high quartz content.Quartz dissolution characteristics and its formation mechanism are studied via casting thin sections,scanning electron microscopy and X-ray diffraction analyzing test data in detail.Quartz dissolution manifest as quartz particles and siliceous cement dissolved into the harbor,serrated outlines,with corrosion pits in part of some particle surfaces.Quartz dissolution has mainly three patterns,including dissolution of the edge of the quartz grains,along quartz overgrowth boundary and in part of quartz particles or in the whole quartz particles.Associated cements characteristics of quartz dissolution has mainly two patterns,i.e.,one is more acidic kaolinite clay mineral associated and another is illite-rich associated.Quartz dissolution mechanisms mainly have two types,i.e.,one is acidic pore waters and Al3+ under an organic acidic background with dissolution of quartz,associated with kaolinite-based acidic clay minerals,which improved reservoirs pores of Benxi group and Shan 2 members,while the other is alkaline pore waters under alkaline diagenesis background with dissolution of quartz,mainly associated with illite-based alkaline or neutral clay minerals,which significantly improved reservoir pores of Taiyuan group.

Cite this article

Tian Xia-he, Qu Hong-jun, Liu Xin-she, Yang Huan, Dong Wen-wu, Chen Ya-hui . Discussion on quartz dissolution and its mechanisms of the Upper Paleozoictight gas reservoirs in the eastern Ordos Basin[J]. Natural Gas Geoscience, 2016 , 27(11) : 2005 -2012 . DOI: 10.11764/j.issn.1672-1926.2016.11.2005

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