--> ABSTRACT: Simulation of Sedimentary Fill of Sichuan Basin by Upper Permian Coals and Carbonate Sequences--An Example of Use of SEDPAK, by Jie Tang, Christopher G. St. C. Kendall, John Strobel, Robert Cannon, Philip Moore, Jim Bezdek, and Gautam Biswas; #91022 (1989)

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Simulation of Sedimentary Fill of Sichuan Basin by Upper Permian Coals and Carbonate Sequences--An Example of Use of SEDPAK

Jie Tang, Christopher G. St. C. Kendall, John Strobel, Robert Cannon, Philip Moore, Jim Bezdek, Gautam Biswas

The Upper Permian sediments of Sichuan and western Hubei provinces of China, in ascending order, are (1) the basal Ermi basaltic volcanic sequence which exceeds 800-m thickness to the west but is only a few centimeters thick in the east; (2) the overlying coal-bearing Longtan Formation which onlaps as continental coal sequences to the west but downlaps and thins to a few meters of marine shales to the east where it is interbedded with and overlain by thick shelfal carbonates of the Wujiaping Formation; and (3) a thick wedge of carbonates of the Changxing Formation which onlaps the lower coals and interfingers with a thin upper coal sequence to the west.

The post-volcanic sedimentary fill can be considered as two supercycles responding to two major sea level changes. The SEDPAK simulation captures deposition of the two supersequences. The first sequence is modeled as onlapping lowstand clastics and coals which, interfingering with ramp carbonates, deepen upward and begin to give up as sea level rise exceeds carbonate growth. The second is modeled as a sequence of ramp to platform carbonates which initially catches up and then keeps up while interfingering westward with coast marine coal sequences.

SEDPAK highgrades the hydrocarbon potential of the carbonate buildups in the second sequence.

AAPG Search and Discovery Article #91022©1989 AAPG Annual Convention, April 23-26, 1989, San Antonio, Texas.