塔里木盆地中寒武统沙依里克组层序结构、沉积体系及其主控因素  

Sequence structure,sedimentary system and its main controlling factors of the Middle Cambrian Shayilike Formation in Tarim Basin

作　　者：袁文芳[1] 吴旭桥 林畅松[2] 娄洪 周露[1] 李浩[2] Wenfang YUAN;Xuqiao WU;Changsong LIN;Hong LOU;Lu ZHOU;Hao LI(Research Institute of Exploration&Development,PetroChina Tarim Oilfield Company,Korla 841000,China;School of Ocean Sciences,China University of Geosciences(Beijing),Beijing 100083,China)

机构地区：[1]中国石油塔里木油田分公司勘探开发研究院,新疆库尔勒841000 [2]中国地质大学(北京)海洋学院,北京100083

出　　处：《天然气地球科学》2024年第1期59-71,共13页Natural Gas Geoscience

基　　金：国家自然科学基金重点项目(编号:42230816);中国石油重大科技项目(编号:ZD2019-183-002);中国石油塔里木油田基础研究项目(编号:041019120073)联合资助~~。

摘　　要：综合利用地震、测井、岩石薄片和岩心资料,应用层序地层学和沉积学方法,建立了塔里木盆地中寒武统沙依里克组的层序地层格架,揭示了该时期碳酸盐岩台地的沉积层序结构、沉积体系特征与演化并探讨了其沉积主控因素。依据地层超覆界面、古岩溶作用面和岩相转换面识别了沙依里克组的2个三级层序,主要由海侵体系域和高位体系域构成,低位体系域不发育。共识别出9种岩相组合、9种沉积亚相和4种沉积相,其中盐湖、咸化潟湖、蒸发潮坪、局限潟湖、局限潮坪等浅水相带在台盆区呈环形展布,台地边缘呈环带状沿满加尔凹陷东、西两侧发育,深水相广泛发育于塔东地区。中寒武世干旱炎热的气候背景和2次“海进—海退”的海平面变化对沙依里克组沉积层序构型和沉积相类型起到了区域性控制作用,早寒武世末期台盆区外隆内凹的古地貌格局以及台地内部局部地区的沉积分异对地貌的改造作用也制约了沉积体系的发育演化。Based on seismic,well logging,rock section and core data,the sequence framework of the Shayilike Formation of the Middle Cambrian in Tarim Basin has been established with sequence stratigraphy and sedimentology methods.The depositional sequence structure and sedimentary system evolution of the carbonate platform and the main controlling factors in this period have been revealed.The Shayilike Formation distributes“thin in the east and thick in the west”.Two third-order sequences can be identified by local unconformities and sedimentary facies abrupt interface,which are mainly composed of transgressive system tract and highstand system tract.Nine lithofacies associations and four sedimentary facies are identified.Shallow water subfacies were distributed in a circular pattern in the platform area,and the platform margin facies were developed along the east and west sides of the Manjiaer Depression in a ring-belt shape.Deep water facies were widely developed in the Tadong area.The regional distribution of sedimentary facies and the local depositional processes are mainly affected by sedimentary palaeogeomorphology,and the sequence development of the Shayilike Formation is mainly controlled by sea-level change,while the increasingly dry and hot climate superimposed controls the extensive development of evaporated platform facies.

关 键 词：塔里木盆地 中寒武统 沙依里克组 层序地层 沉积演化 

分 类 号：TE122.1[石油与天然气工程—油气勘探]