鄂湘桂地区栖霞组古氧相分析与层序地层和海平面变化

鄂湘桂地区，早二叠世栖霞组主要为贫氧沉积，通过恢复其形成时沉积环境水体中溶氧量特征及其变化，识别出６个古氧相和４种古氧相相序。古氧相类型、古氧相相序及相差分别反映了沉积环境海平面变化的相位，速度和幅度。古氧相分析从成因上刻画了地层层序的内部结构，成为本区栖霞组内关键性界面，副层序，体系域及层序识别和确定的基础，在对岩相组合单调，空间上岩相厚度变化不大，同时具缺氧成因特征的地层进行层序地层分析时，具

OXYGEN-RELATED FACIES AND SEQUENCE STRATIGRAPHY IN THE QIXIA FORMATION OF THE HUBEI- HUNAN - GUANGXI REGION

The Early Permian Qixia Formation in the Hubei-Hunan-Guangxi region was mainly formed in a dysaerobic environment. Through reconstructing the feature of the oxygen-dissolved quantity and its change in waters during its deposition, 6 oxygen related facies (ORF) and 4 ORF successions have been recognized in the formation. The ORF,ORF succession and span of ORF shift have respectively shed light on the phase, velocity and amplitude of the sea-level changes, and played a crucial role in the recognition of the key surf ace, parasequence, depositional systems tract and depositional sequence. As genetically analyzing the internal architecture of the depositional sequence , the ORF analysis is important for the analysis of the sequence stratigraphy of dysaerobic strata with a monotonous facies association and showing no significant variation in facies thickness.