辽宁铁岭盆地早白垩世孢粉组合

EARLY CRETACEOUS SPORE AND POLLEN ASSEMBLAGES FROM THE TIELING BASIN, LIAONING PROVINCE

铁岭盆地白垩系发育,1990年以来辽河油田公司在该区钻探了3口参数井,并在下白垩统采获了较丰富的孢粉化石,建立了3个早白垩世孢粉组合,自下而上为Cicatricosisporites-Concavissimisporites-Protoconiferus组合,Cicatricosisporites-Abdiverrucospora-Piceaepollenites组合以及Deltoidospora-Cicatricosisporites-Laevigato-sporites-Tricolpopollenites组合,分别产自九佛堂组、沙海组和阜新组。本文叙述了组合特征,通过与国内外孢粉组合的对比及特征分子的时代分布,确立了本区早白垩世生物地层层序及地质时代。孢粉植物群反映了温暖潮湿的热带-亚热带气候。

The Tieling Basin lies in northern Liaoning Province, where the Cretaceous strata are extremely well developed and extensively distributed. The Liaohe Oil Company has drilled 3 test wells in Tieling Basin, and the first well, Changcan 1 was drilled there in 1990. The authors analysed more than 1 000 core samples, obtained large quantity of sporopollen fossils. In the study, systematic integration and research has been done on the palaeobiological data for the recent 17 years, three sporopollen assemblages of the Early Cretaceous have been established. They are the Cicatricosisporites-Concavissimisporites-Protoconiferus assemblage in Jiufotang Formation, the Cicatricosisporites- Abdiverrucospora-Piceaepollenites assemblage in Shahai Formation and the Deltoidospora-Cicatricosisporites-Laevigatosporites-Tricolpopollenites assemblage in Fuxin Formation. In addition, the comparison was made with the foreign and other domestic sporopollen assemblages,indicating their age of Valanginian, Hauterivian--Barremian, Barremian-Aptian （Early Cretaceous）. The Early Cretaceous fossil data established in the study area has great significance on the hydrocarbon exploration and the study on the Cretaceous sequence and palaeoclimate.