Abstract
The deltaic and lacustrine sediments, respectively in the syn- and post- rift stages, are recorded during the Cretaceous at the Wulan-Hua Sag, Erlian Basin, Inner Mongolia. In this study, the Mesozoic depositional system and sequence stratigraphic framework are recognized in the Wulan-Hua sag using core, well-log and seismic data. Five sedimentary facies have been identified including fan-delta, braided delta, shallow-lacustrine, deep-lacustrine, and sublacustrine-fan during Cretaceous at the Wulan-Hua Sag. One first-order sequence (MSQ1), three second-order sequences (SSQ1, SSQ2, and SSQ3), and five third-order sequences (SQ1, SQ2, SQ3, SQ4, and SQ5) are classified by subaerial unconformities along the basin margins and correlative conformities in the central part of the basin. During the depositional period of SQ1, SQ2, and SQ3, the depocenter controlled by lake-level fluctuations migrated from southern to northern part companying with multiple- to single-provenance supplies. The characteristics of sedimentary facies and sequence stratigraphy in the Wulan-Hua sag are commonly controlled by faults, provenance and depocenters. The development of the third-order sequences is dominated by tectonism and sediment supplies, as well as lake-level changes driven by climate. The favorable targets for hydrocarbon located in the lowstand system tract of SQ1, SQ2 and SQ3 at the southern parts of the Wulan-Hua Sag.
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