Diagenesis of Chang101 Sandstone Reservoir in Ansai Oilfield of Ordos Basin
Received date: 2011-04-02
Revised date: 2011-05-23
Online published: 2011-08-10
Based on measurement of thin section,casting thin section,scanning electron microscope,and X-ray diffraction for Chang 101 sandstone reservoir,we use the quantitatively calculating methods to study the diagenesis of Chang 101 sandstone reservoir in the Ansai oilfield. The feldspar sandstone is dominant n the sandstone.The diagenesis of sandstone reservoir is fallen into the middle degree stage B.The actions for the poor-quality reservoir are both early compaction and cementation of several minerals.Dissolution (especially feldspar and laumontite dissolution) is a factor for improving the reservoir property.Considering diagenetic types and quantitative characters,five kinds of diagenetic facies are classified.the diagenetic facies control the distribution of the highly permeable reservoir.
Key words： Ansai oil field; Diagenesis; Diagenetic facies.
XIN Hong-Gang, ZHANG Zhen-Hong, YUN Zheng-Wen, LIU Xiao-Ying . Diagenesis of Chang101 Sandstone Reservoir in Ansai Oilfield of Ordos Basin[J]. Natural Gas Geoscience, 2011 , 22(4) : 588 -594 . DOI: 10.11764/j.issn.1672-1926.2011.04.588
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