塔里木盆地上泥盆—下石炭统层序地层格架与古地理

利用110余口钻井的录井和测井资料,结合地震资料,运用沉积学原理和层序地层学原理,建立了塔里木盆地上泥盆-下石炭统层序地层格架.自下而上,塔里木盆地上泥盆-下石炭统发育东河层序(SQd)、巴楚1层序(SQb1)、巴楚2层序(SQb2)、卡拉沙依1层序(SQk1)共4个三级层序,每个层序均可划分出海侵体系域(TST)和高...

Sequence stratigraphic framework and palaeogeography of the Upper Devonian to Lower Carboniferous in Tarim Basin

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.