黔南拗陷二叠系层序地层特征及岩相古地理

黔南拗陷二叠系发育良好,沉积分异明显,具有重要的油气地质意义。运用与露头层序地层学有关理论和研究方法,在详细的沉积学研究和精细的地层划分对比基础上,将黔南地区二叠系隆林阶至长兴阶划分为2个不完整的超层序及12个三级层序,并进行了层序对比。以超层序体系域为编图单元系统编制了二叠系各期的层序岩相古地理图,并结合海平面变化、构造运动及碳酸盐生长特征等因素探讨了古地理的演化,认为台盆相带内的深水欠补偿沉积是良好的烃源岩,台地内部高能浅滩及台地边缘高能礁滩组合为有利储层发育相带。

Characteristics of the Permian sequence stratigraphy and the paleogeographic environment in South Guizhou sag, China

The Permian strata in the South Guizhou sag are well developed and the characteristics of sedimentary differentiation are significant.Therefore,the Permian strata in the South Guizhou sag are of important petroleum geological significance.This paper uses the relevant theories and research methods with the outcrop sequence stratigraphy.Based on the detailed sedimentologic investigations and refined strata division and correlation,The Permian strata from Longlinian stage to Changxing stage are divided into two incomplete super sequences and 12 third-order sequences,and the sequences are correlated.Taking the super-sequence system tract as the mapping unit,the sequence-lithofacies paleogeography map of each stage in Permian is compiled systematically and the evolutionary features of the paleogeography are discussed combined with the factors such as the sea level change,tectonic activities and characteristics of carbonate growth.The authors think that the compensation sediments in the platform-basin are good source rocks and the high energy shoal inside the carbonate platform and the high energy reef-bank association on the platform margin are favorable reservoir facies belts.