Abstract
The Early Cretaceous is an important coal accumulation period in China. Abundant coal resources were formed in the southeastern margin of Songliao Basin. Sequence stratigraphy and coal accumulation of the Early Cretaceous in the southeastern margin of Songliao Basin have been studied on the basis of extensive outcrop and borehole data. Based on regional unconformity, basal erosional surfaces of incised valley fills, and abrupt depositional facies-reversal surface, six sequence boundaries have been identified, which subdivide the Early Cretaceous coal-bearing series into 5 third-order sequences. Sequence I corresponds to Huoshiling Formation, sequences II and III correspond to member I and member II of Shahezi Formation. Sequences IV and V correspond to member I and member II of Yingcheng Formation. Sequence I developed at the initial subsiding stage, sequence II and III developed during the stable subsiding stage, while sequence IV and V developed during the basin shrinkage stage. The major coal seams were developed in the sequence II and III, which ensured the relative balance between the increase rate of the accommodation space and the rate of peat accumulation for a longer period, thus forming a thick coal seam.
Highlights
Songliao Basin is an important sedimentary basin in China, filled with the Cretaceous strata which contain abundant petroleum resources and abundant coal resources (Li 1988; Gao and Cai 1997; Wang et al 2007, 2013)
Abundant coal resources were formed in the southeastern margin of Songliao Basin
Sequence stratigraphy and coal accumulation of the Early Cretaceous in the southeastern margin of Songliao Basin have been studied on the basis of extensive outcrop and borehole data
Summary
Songliao Basin is an important sedimentary basin in China, filled with the Cretaceous strata which contain abundant petroleum resources and abundant coal resources (Li 1988; Gao and Cai 1997; Wang et al 2007, 2013). The Yingcheng, Changchun and Liufangzi sub-basins, located in the southeastern margin of Songliao Basin in Jilin Province, were found with the Early Cretaceous coals, which provide opportunity to study depositional facies and sequence stratigraphic framework of the Early Cretaceous coalbearing series, and the coal accumulation patterns can be understood better through the study in these sub-basins. In this study, based on analyses of facies and facies associations, the sequence stratigraphic framework of the Early Cretaceous coal-bearing series in the Yingcheng, Changchun and Liufangzi sub-basins along the southeastern margin of Songliao Basin in Jilin Province is established, and the distribution patterns of thick coal seams and the main controlling factors of a sequence framework in these rift sub-basins are discussed
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