吐哈盆地台北凹陷三工河组二段物源与沉积体系研究  

Provenance and depositional systems of the second member of Lower Jurassic Sangonghe formation in Taibei sag,Turpan-Hami Basin,China

作　　者：郝爱胜[1,2] 吴浩 冉启贵 李剑[1,2] 国建英[1,2] 班舒悦 齐雪宁[1,2] 陈旋 陶辉飞 贾雪丽 HAO Aisheng;WU Hao;RAN Qigui;LI Jian;GUO Jianying;BAN Shuyue;QI Xuening;CHEN Xuan;TAO Huifei;JIA Xueli(PetroChina Research Institute of Petroleum Exploration&Development,Beijing 100083,China;CNPC Key Laboratory of Natural Gas Reservoir Formation and Development,Langfang,Hebei 065007,China;Key Laboratory of Mineral Resources in Western China(Gansu Province),School of Earth Sciences,Lanzhou University,Lanzhou,Gansu 730000,China;PetroChina Turpan-Hami Oilfield Company,Hami,Xinjiang 839009,China;Key Laboratory of Petroleum Resources(Gansu Province),Northwest Institute of Eco-Environment and Resources,Chinese Academy of Sciences»Lanzhou,Gansu 730000,China)

机构地区：[1]中国石油勘探开发研究院,北京100083 [2]中国石油天然气集团有限公司天然气成藏与开发重点实验室,河北廊坊065007 [3]兰州大学地质科学与矿产资源学院甘肃省西部矿产资源重点实验室,甘肃兰州730000 [4]中国石油吐哈油田分公司,新疆哈密839009 [5]中国科学院西北生态环境资源研究院甘肃省油气资源研究重点实验室,甘肃兰州730000

出　　处：《中国矿业大学学报》2021年第5期893-908,共16页Journal of China University of Mining & Technology

基　　金：中国石油天然气股份公司科技项目(kt2018-08-04);甘肃省青年科技基金计划项目(20JR5RA226);中央高校基本科研业务费项目(lzujbky-2019-1)。

摘　　要：为阐明吐哈盆地台北凹陷三工河组二段物源与沉积体系特征,综合轻重矿物、锆石U-Pb年龄、测井、岩心、粒度及地震数据等资料,系统研究了三工河组二段物源方向,刻画了沉积相类型及沉积体系展布特征,认为三工河组二段沉积主要受南、北双物源控制,且北部物源体系可延伸至SK1—JS1—J5井一带,为湖底扇的形成提供了物源补给。研究结果表明:台北凹陷东北区域岩屑类型以岩浆岩岩屑为主,与以火山碎屑岩岩屑为主的其他区域差异特征显著;北部区域重矿物组合中不含石榴石或者含量极低,而在西北区域和南部区域石榴石含量则相对较高;北部区域碎屑锆石U-Pb年龄分布特征高度相似,呈现单峰式,主体年龄介于250~360 Ma,物源主要来自博格达山东段;而南部区域碎屑锆石U-Pb年龄分布宽泛,呈现多峰式,物源主要来自觉罗塔格山及中天山东段.三工河组二段主要发育辫状河三角洲、湖泊和湖底扇3种沉积相,并进一步划分出6种亚相8种微相;其中,南部发育辫状河三角洲—湖泊沉积体系,北部发育辫状河三角洲—湖泊—湖底扇沉积体系.湖底扇沉积中识别出砂质碎屑流和远源浊流等重力流沉积类型,其中砂质碎屑流砂体厚、粒度粗、物性较好、易于油气聚集,是台北凹陷洼内岩性油气藏勘探部署的有利相带.To elucidate the provenance and depositional systems of the second member of Lower Jurassic Sangonghe formation of Taibei sag in Turpan-Hami Basin, light and heavy minerals, zircon U-Pb dating, logging, core analysis, grain size analysis and seismic data were used to study the provenance systems, types of sedimentary facies and its distribution characteristics. It is indicated that the second member of Sangonghe formation is mainly controlled by the south and north sources, and the northern provenance system can extend to the SK1—JS1—J5 well areas, providing material conditions for the formation of sublacustrine fans. The results showed that the type of debris in the northeastern area of Taibei sag is dominated by magmatic rock debris, which is significantly different from other regions dominated by pyroclastic rock debris. The heavy mineral assemblage in the northern region does not contain garnet or the content is very low, while the garnet content in the northwest and southern regions is relatively high. The U-Pb age distribution characteristics of detrital zircons in the northern region are highly similar, showing a single peak, with the main age ranging from 250 to 360 Ma, and the source is mainly from the eastern section of the Bogda Mountain. However, the U-Pb age of detrital zircons in the southern region is wide, showing a multi-peak pattern, and the provenance mainly comes from the Jueluotage Mountain and the eastern section of central Tianshan Mountains. The sedimentary facies of the second member of Sangonghe formation include braided river delta, lake and sublacustrine fan facies, which can be further subdivided into six subfacies and eight microfacies. Among them, the braided river delta-lacustrine sedimentary system developed in the south, and the braided river delta-lake-sublacustrine fan sedimentary system developed in the north. The gravity flow deposition types such as sandy debris flow and remote turbidity current have been identified in the sublacustrine fan deposition. The thick layer sa

关 键 词：物源 沉积体系 锆石U-PB定年 三工河组 台北凹陷 吐哈盆 

分 类 号：P618.130.2[天文地球—矿床学]