Study on Diagenesis of Lower Youshashan Formation of Wunan Oil Field in Qaidam Basin

SHI Yong, HOU Gui-ting, ZHONG Shang-lun, YANG Gui-mo

doi:10.11764/j.issn.1672-1926.2012.05.909

Natural Gas Geoscience >

2012 , Vol. 23 >Issue 5: 909 - 915

DOI: https://doi.org/10.11764/j.issn.1672-1926.2012.05.909

Study on Diagenesis of Lower Youshashan Formation of Wunan Oil Field in Qaidam Basin

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1.School of Earth and Space Sciences,Peking University,Beijing 100871,China;
2.The No.2 Oil Producing Plant,PetroChina Qinghai Oilfield Company,Mangya 816400,China

Received date: 2011-11-25

Revised date: 2012-08-09

Online published: 2012-10-10

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Abstract

Sedimentation and changes of sediments under different diagenetic conditions is key to the reservoir research and evaluation. Through systematic analyses of core slices,cast thin sections,clay mineral X-ray diffraction and scanning electron microscopy,it is summarized that diagenesis of the lower Youshashan Formation in the Wunan oilfield includes mechanical compaction,cementation,dissolution and metasomatism. Dissolution is a favorable factor for the improvement of reservoir properties,while compaction,cementation and metasomatism are unfavorable to the reservoirs. Studies on diagenetic sequence demonstrate that reservoir sandstones of the lower Youshashan Formation in the Wunan oil field are during the early diagenetic B substage. Researches on diagenesis are beneficial to the reservoir classification and evaluation of the lower Youshashan Formation in the Wunan oil field,as well as prediction of favorable reservoirs.

Key words： Diagenesis; Wunan oil field; Qaidam basin

Cite this article

SHI Yong, HOU Gui-ting, ZHONG Shang-lun, YANG Gui-mo . Study on Diagenesis of Lower Youshashan Formation of Wunan Oil Field in Qaidam Basin[J]. Natural Gas Geoscience, 2012 , 23(5) : 909 -915 . DOI: 10.11764/j.issn.1672-1926.2012.05.909

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