Research of Sequence Stratigraphic Models of Jiufotang Formation, Lower Cretaceous, The Luxi Sag, The Kailu Basin

摘要

With comprehensive utilization of drilling, logging and seismic data, research was conducted on the sequence stratigraphic models of Jiufotang Formation, Lower Cretaceous in the Luxi Sag, Kailu Basin. It was revealed that Jiufotang Formation could be divided into one three-order sequence, which including lowstand systems tract (LST), transgressive systems tract (TST), highstand systems tract (HST) and regressive systems tract (RST). Within the sequence, it developed five types of sedimentary fades, which were nearshore subaqueous fan, braided river delta, meandering river fan, turbidite fan and lacustrine fades, respectively. The LST mainly developed nearshore subaqueous fan, the TST mainly developed meandering river deltas while the HST and RST mainly developed meandering river delta, braided river delta and nearshore subaqueous fan. In addition, turbidite fan developed in all four systems tracts. Two types of sequence stratigraphic models developed: short-axis model and long-axis model.