地质科学2011，Vol.46Issue(4)：973-982,10.
塔南凹陷层序地层格架与沉积体系分布
Sequence stratigraphic frameworks and depositional system distribution of Tanan depression
摘要
Abstract
Based on stratigraphic re-division and re-correlation of Tanan depression, its lower cretaceous can be divided into 3 first-order sequences, 4 second-order sequences and 6 third-order sequences according to seismic data, drilling datalogging data, paleontological data,geochemical data,and tectonic evolution characteristics. There are 6 main sedimentary systems in all sequences, such as alluvial system, fan delta system, braided river delta system, meandering river delta system, turbidite fan system and lacustrine system. Alluvial system is now found primarily in SQ1, whereas fan delta system primarily in SQ1 to SQ2, braided river delta system primarily in SQ3 ~ SQ5, meandering river delta system primarily in SQ6, turbidite fan system primarily in SQ4 and lacustrine system in all 3 first-order sequences. Sedimentary systems evolution is under control by palaeogeomorphology formed during Tanan depression tectonic evolution. Small lake basins filling at intermountain remnant basin stage formed SQ1 , and SQ2 ~ SQ3 formed in broad and gentle palaeogeomorphology environment at passive rift stage,SQ4 formed under complex small faulted lake basins background at initial active rift stage, whereas SQ5 ~ SQ6 formed in wide basin with deepwater environment at stage of faulted basin transform to depression.关键词
塔南凹陷/下白垩统/层序地层/沉积体系Key words
Tanan depression/Lower Cretaceous/Sequence stratigraphy/Depositional system分类
天文与地球科学引用本文复制引用
杨勉,孙文峰,陈艳丽..塔南凹陷层序地层格架与沉积体系分布[J].地质科学,2011,46(4):973-982,10.基金项目
国家大型油气田及煤层气开发科技重大专项“中国大型气田形成条件、成藏机制与富集规律研究”(编号:2011ZX05007-002)资助. （编号:2011ZX05007-002）
