青藏高原可可西里地区晚三叠世苟鲁山克措组沉积体系特征及环境演化  

Sedimentary system characteristics and environment evolution of Late Triassic Goulushankecuo Formation in Hoh Xil Area ofQinghai-Tibet Plateau

作　　者：王若谷 廖友运[3] 王妍[4] 李文厚[5] 李兆扬 WANG Ruogu;LIAO Youyun;WANG Yan;LI Wenhou;LI Zhaoyang(College of Engineering,Dali University,Dali 671003,China;Research Institute of Yanchang Petroleum(Group)Co.,Ltd.,Xi′an 710065,China;Aerophotogramrntry and Remote Sensing of China Coal,Xi′an 710199,China;College of Petroleum Engineering,Xi′an Shiyou University,Xi′an 710065,China;Department of Geology,Northwest University,Xi′an 710069,China)

机构地区：[1]大理大学工程学院,云南大理671003 [2]陕西延长石油(集团)有限责任公司研究院,陕西西安710065 [3]中国煤炭地质总局航测遥感局,陕西西安710199 [4]西安石油大学石油工程学院,陕西西安710065 [5]西北大学地质学系,陕西西安710069

出　　处：《西北大学学报（自然科学版）》2020年第4期644-653,共10页Journal of Northwest University（Natural Science Edition）

基　　金：国家自然科学基金青年基金资助项目(41902241)。

摘　　要：以研究区野外实测地层-沉积剖面为基础,根据岩石学、沉积构造及古生物化石等分析,以确定晚三叠世苟鲁山克措组的沉积体系特征及环境演化。研究结果表明,区内主要发育陆棚、碎屑海岸和扇三角洲沉积体系,并可进一步划分为浅海陆棚、潮坪、扇三角洲前缘和扇三角洲平原4种亚相。受区域构造演化的控制,苟鲁山克措组沉积期,研究区经历了由海到陆的沉积演化过程,T3g1期发育浅海陆棚亚相;T3g2期海水开始退出,区内主体为潮坪亚相;T3g3期过渡为扇三角洲前缘亚相;T3g4-T3g5期海水完全退去,区内发育扇三角洲平原亚相。Hoh Xil area is located in the interior hinterland of Qinghai-Tibet Plateau,poor ecological condition leads to the low degree of research.The sedimentary system characteristics and environment evolution were constructed through the petrology,sedimentary structure and fossils analysis of the Upper Triassic Goulushankecuo Formation,based on a survey of a stratigraphic-sedimentary section in this area.The results showed that the main sedimentary systems in the study area included marine shelf,clastic coast and fan delta,which can be subdivided into subfacies including a shallow marine shelf,a tidal flat,a fan delta front and a fan delta plain.Controlled by the regional structural evolution,the study area has finished the change from sea to land.During the T 3 g 1 period,the paleographic environment of the study area was mainly shallow marine shelf subfacies.Sea water was gradually withdrawn from the study area since T 3 g 2 period,the main sedimentary facies was tidal flat,and changed into fan delta plainduring T 3 g 3 period.Till T 3 g 4 and T 3 g 5 period,sea water has completely withdrawn from this area,and a fan delta plain was developed.

关 键 词：晚三叠世 苟鲁山克措组 沉积体系 沉积演化 可可西里地区 

分 类 号：TE121.1[石油与天然气工程—油气勘探]