Characteristics of reef and shoal facies reservoir of Upper Permian Changxing Formation in Wubaiti area，eastern Sichuan Basin
Online published: 2010-06-15
The characteristics and genesis of Changxing Formation reservoir in Wubaiti area are studied．The result indicates that intracrystalline pores，intercrystalline solution pores，super large dissolved pores and caves supply the prominent reservoir space．Th e reservoir rocks are mainly grain dolomite，reef dolomite and crystal dolomite．The reservoir property is generally poor and it is attributed into fracture-pore reservoir with low porosity and medium permeability． The development of reservoir of Changxing Formation is generally controlled by microfacies and diagenesis．The reef and shoal facies of the platform edge which developed in the period of sustained transgression controlled the distribution of the reservoir．Reef platform shallows，framework reef and binding reef are favorab le microfacies for reservoir space． Diageneses including dolomitization and dissolution are primarily beneficial to the reservoir quality．Excellent reservoir is always associated th the multistage burial dolomitization，early dissolution，mi ddle dissolution at middle—anadiagenetic stage，late dissolution at anadiagenetic stage and hydrogen sulfuric acid dissolution related with TSR．
ZHANG Tao , HU Ziduo , LIU Wenqing , LU LieQin , SHAO Xichun . Characteristics of reef and shoal facies reservoir of Upper Permian Changxing Formation in Wubaiti area，eastern Sichuan Basin[J]. Lithologic Reservoirs, 2010 , 22(2) : 24 -31 . DOI: 10.3969/j.issn.1673-8926.2010.02.005
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