THE MICROFACIES ARCHITECTURE AND ZONING OF DELTA FRONTIN DEPRESSED-TYPE LACUSTRINE BASIN——TAKING THE YANCHANGFORMATION OF TRIASSIC IN ORDOS BASIN AS AN EXAMPLE
Received date: 2006-04-05
Revised date: 2006-08-09
Online published: 2006-12-10
Taking the Yanchang formation of Triassic in Ordos basin as an example, this paper research in detail the microfacies architecture and association types of depressed type lacustrine deha fronts. The microfacies of delta fronts include truncated distributary channels and integrated distributary channels, river mouth bars. distal bars, front sheet sandstones and interdistributary bay. According to association type the microfacies may be divided four types of sandstones that consist of nine subtypes including superimposed distributary channel, superimposed channel mouth bars, subaqueous distributary channels anti channel mouth bar associations and channel mouth bar, distal bar and front sheet association. The authors discusses in detail distribution microfacies association of delta fronts. The depressed-type lacustrine deha fronts can be divided into three parts： platform delia front, sloping delta front anti basin delta front by the bounds of slope break. Every part has unique microfacies association type.
LI Feng-jie， WANG Duo-yun . THE MICROFACIES ARCHITECTURE AND ZONING OF DELTA FRONTIN DEPRESSED-TYPE LACUSTRINE BASIN——TAKING THE YANCHANGFORMATION OF TRIASSIC IN ORDOS BASIN AS AN EXAMPLE[J]. Natural Gas Geoscience, 2006 , 17(6) : 775 -778 . DOI: 10.11764/j.issn.1672-1926.2006.06.775
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