TITLE:
Sequence Stratigraphy and Sedimentary Facies of Feixianguan Formation in the Kaijiang-Liangping Area of Sichuan Basin, China
AUTHORS:
Qingbin Xie, Zhifang Wang, Yongli Ouyang, Miaoyi Zhang, Bing Liu, Lvli Wang, Xiaojing Liu
KEYWORDS:
Sichuan Basin, Kaijiang-Liangping Area, Feixianguan Formation, Sedimentary Facies
JOURNAL NAME:
Open Journal of Geology,
Vol.10 No.6,
June
23,
2020
ABSTRACT: The Feixianguan formation in the Kaijiang-Liangping basin has been the
focus of extensive research on multiple aspects. Based on field survey, core
observation, laboratory analysis and seismic data interpretation, the sequence
stratigraphy and sedimentary facies of the Kaijiang-Liangping area are studied.
Four sequence boundaries and three maximum flooding surfaces of the Feixianguan
formation are detected in this area. Three third-order sequences are identified
as first sequence (SQ1), the second sequence (SQ2), and the third sequence
(SQ3) in which SQ1 corresponds to the member 1 of the Feixianguan formation,
SQ2 corresponds to the member 2, and SQ3 corresponds to the member 3 and member
4. Member 1, 2, 3 and 4 are lithologic sections divided by predecessors. On the
basis of this sequence division and their sedimentary marks, the facies of the
Feixianguan formation can be divided into open platform and evaporate platform
categories. The open platform is composed of three subfacies identified as
platform bank or basin marginal bank, interbank, and platform basin. Thus, a
sedimentary evolution model is established. According to the sedimentary and
seismic characteristics of the Kaijiang-Liangping area, we determine that two
oolitic bank models, the aggradation model and the progradation model, are
developed in this area. The aggradation model is developed in the Longgang
region, which includes the basin marginal bank as a favorable exploring zone. The
progradation model is developed in the Jiulongshan and Longhui areas, besides
the basin marginal bank, the favorable exploration zones also include the
oolitic bank developing areas of the inner basin.