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The Mechanism of Secondary Porosity in Oligocene Reservoir in Southern Shwebo Basin, Myanmar

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  • CNOOC Research Institute, Beijing 100027,China

Received date: 2010-01-11

  Revised date: 2010-02-04

  Online published: 2010-04-10

Abstract

Based on petrographic microscope examinations, regional tectonic evolution and basin burial history in Shwebo basin, Myanmar, type and mechanism of secondary pores of Paleogene reservoir is discussed. The major factors controlling development of secondary porosity included dissolution of acidic components (such as carbonate), tectonic activity and matching of them. The structural compression in late Oligocene caused the uplift of the Oligocene strata and explore, then the calcite cement between grains was dissolved through supergene leaching of acidic atmospheric water, and the secondary porosity was formed. Although the acidic fluid was generated during thermal evolution of organic matter, the secondary porosity in Eocene reservoir can not be generated because of block of organic acid flow.

Cite this article

XIE Nan, JIANG Ye, ZHU Guang-Hui, LI Ai-Shan, CAI Wen-Jie, LV Dong, NIE Zhi-Meng . The Mechanism of Secondary Porosity in Oligocene Reservoir in Southern Shwebo Basin, Myanmar[J]. Natural Gas Geoscience, 2010 , 21(2) : 289 -294 . DOI: 10.11764/j.issn.1672-1926.2010.02.289

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