Sequence stratigraphic framework and palaeogeography of the Upper Devonian to Lower Carboniferous in Tarim Basin
Xin Renchen1, Jia Jinhua2, Yang Bo1
1 School of Marine Sciences，China University of Geosciences(Beijing)，Beijing 100083 2 Research Institute of Petroleum Exploration ＆ Development，PetroChina，Beijing 100083
Abstract：Based on logging curves and well logging data of 110 drilling wells，combining with seismic data，the sequence stratigraphic framework of the Upper Devonian to Lower Carboniferous was established in the Tarim Basin using sedimentologic and sequence stratigraphic principles.From bottom to top，4 third-order sequences were developed from the Upper Devonian to Lower Carboniferous in the Tarim Basin namely as SQd、SQb1、SQb2 and SQk1，and each sequence can be subdivided into transgression systems tract(TST)and high systems tract(HST).The stratigraphic distribution and palaeogeography framework of each sequence was also studied.From bottom to top，the stratigraphic distribution of each sequence widened and overlapped.The palaeogeography evolved from shallow sea bay-peninsula during the depositional period of SQd to shallow sea-isolated island during the depositional periods of SQb1 and SQb2，and the northern Tarim Basin was all sank below the water during the depositional period of SQk1 which led to the formation of a broad shallow sea.Strata of SQd，SQb1 and SQb2 overlapped to “peninsula” and “isolated island”，and the surrounding areas of the “peninsula” and “isolated island” are potential zone for the development of stratigraphic traps.
Xin Renchen,Jia Jinhua,Yang Bo. Sequence stratigraphic framework and palaeogeography of the Upper Devonian to Lower Carboniferous in Tarim Basin[J]. JOPC, 2011, 13(6): 665-676.
