DIAGENESIS OF THE CHANG 6 MEMBER, UPPER TRIASSIC,FUXIAN AREA OF ORDOS BASIN
Received date: 2007-01-18
Revised date: 2007-04-24
Online published: 2008-06-20
The paper is aimed at making clear the distribution of the favorable reservoirs in the area. Based on core description, cast section, popular section, scanning election microscope, x-ray diffraction etc, it is believed that the main diagenesis types are pressure solution, cementation and dissolution. The primary porosity of the reservoir rocks is 37.17%, which is reduced by 18.78% by compaction and pressure solution and 9.16% by cementation, and 5.12% by asphalt-filling. The secondary pores are produced by organic acids' dissolving organic matter at maturing stages, resulting in an increase of porosity by 5.38%. The preserved average porosity is 9.49% at present.
Key words： Fuxiang area; Chang 6 Member; Yanchang formation; Ordos basin; Diagenesis
GOU Ying-chun; LI Jian-qi;ZHENG Hong-jun; PENG Jun. . DIAGENESIS OF THE CHANG 6 MEMBER, UPPER TRIASSIC,FUXIAN AREA OF ORDOS BASIN[J]. Natural Gas Geoscience, 2007 , 18(3) : 360 -364 . DOI: 10.11764/j.issn.1672-1926.2007.03.360
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