川东南庙高寺—二里场地区嘉陵江组层序地层与沉积相  

Sequence Stratigraphy and Sedimentary Facies of Lower Triassic Jialingjiang Formation in Miaogaosi-Erlichang Area,Sichuan Basin

作　　者：李文茂[1] 李国蓉[1] 张天操[1] 李弢[2] 金小燕[1] 周大志[1] 

机构地区：[1]成都理工大学油气藏地质及开发工程国家重点实验室 [2]中国石油西南油气田分公司蜀南气矿

出　　处：《海相油气地质》2010年第2期36-44,共9页Marine Origin Petroleum Geology

基　　金：国家自然科学基金委员会与中国石油化工股份有限公司联合基金(编号40739903);国家重大专项"大型油气田及煤层气开发"(编号2008ZX05005-002-008HZ)资助

摘　　要：下三叠统嘉陵江组可划分为2个三级层序,对应嘉一—嘉二、嘉三—嘉五两大地质时期。根据岩心和测井解释进一步识别出了6个四级层序和15个五级层序。这两个三级层序都由海侵体系域和高位体系域构成,沉积相都经历了由开阔环境向局限环境的转变。因此嘉陵江组含开阔台地和半局限—局限台地两大沉积相,同时可识别出6种亚相及20种微相。四级、五级层序在广大的台地区具有可比性,纵向上滩体位置变化不明显。嘉二1和嘉四1这两个时期处于特殊的海平面升降旋回阶段,台内滩相较发育;嘉一到嘉二期和嘉三、嘉四到嘉五期,经历了由开阔台地相的石灰岩沉积到局限台地相的膏岩、白云岩沉积两次大的相变,构成两轮沉积旋回。Two 3rd-order sequences can be divided in the Lower Triassic Jialingjiang Formation （T1j） in the eastern part of Sichuan Basin,which correspond to two geologic chrons,Jialingjiang 1 to 2 Members（T1j^1-2） and 3 to 5 Members（T1j^3-5）. Based on the comprehensive study of rock cores and loggings, six 4th-order and forteen 5th-order sequences are further recognized and both of 3rd-order sequences are attributed to TST and HST. The sedimentary facies went through a transition from open platform to restricted platform so that Jiangling Formation includes the two sedimentary facies, the open platform facies and the half-restricted to restricted platform facies, from which six subfacies and twenty microfacies can be recognized. The 4th-order and 5th-order sequences are comparative in wide region of platform but the bank has not significant migration in vertical. Bank facies developed in the platform during T1^2 1 and T1^4 1 chrons which were just in a special stage of eustracy cycles. Limestone of the open platform facies is transformed into gyprock and dolostone of the restricted platform facies during T1j^1-2 and T1j^3-5,which consti- tute two sedimentary cycles.

关 键 词：下三叠统 层序地层 沉积相 嘉陵江组 四川盆地 

分 类 号：TE112.23[石油与天然气工程—油气勘探]