摘要
塔里木盆地西部海西中期抬升事件,前人称为"巴楚运动",认为发生于小海子组与标准灰岩沉积期之间。有研究者否认其存在,有人认为发生于小海子组与含灰岩段沉积期之间,有人认为发生于上泥岩段与砂泥岩段沉积期之间,多数研究者未提及。根据地表及钻井地层对比、地震资料解释追踪认为,在塔里木盆地西部卡拉沙依组上泥岩段沉积之后发生一次抬升事件,依次剥蚀了卡拉沙依组上泥岩段、标准灰岩段、中泥岩段,直至巴楚组。而后海水由塔西南向东、向北侵入,超覆沉积了玛扎塔格组砂泥岩段、含灰岩段和小海子组。该次运动发生的时间大致在早石炭世大塘期中、晚时之间,造成塔西地区由寒武纪以来的北倾斜坡反转为南倾斜坡,使寒武—奥陶系成熟烃源岩排出的烃类运移指向南转换向北。位于麦盖提斜坡和巴楚隆起上海西晚期形成的构造带,是油气的有利聚集区,现已发现了和田河气田、鸟山气田、巴什托油气田、亚松迪气田和海米罗斯东含气构造等。
An uplift event in the middle Hercynian period in the western Tarim Basin was called＂Bachu Movement＂by early researchers,and mainly occurred between the Xiaohaizi Formation and the standard limestone sequence.Some researchers denied its existence,some researchers believed that it occurred between the Xiaohaizi Formation and the limestone sequence,some other researchers believed that it occurred between the upper mudstone sequence and the sandstone-mudstone sequence,and most researchers did not mention it. According to well-strata contrast and seismic interpretation and tracking,the authors have concluded that a tectonic uplift event occurred between the upper sandstone sequence and the sandstone-mudstone sequence in the Kalashayi Formation,which led to the erosion of the upper mudstone sequence,the standard limestone sequence and the middle mudstone sequence in the Kalashayi Formation and even the Bachu Formation. Afterwards,seawater encroached from the southwestern Tarim Basin towards north and east,and the sandstone-mudstone sequence and limestone sequence in the Mazhatage Formation and the Xiaohaizi Formation were deposited. The Bachu Movement occurred between the middle and late stages of the Datang period of the Early Carboniferous,and made the southwestern Tarim Basin reverse from a north dipping slope to a south dipping one. Hydrocarbons expelled from the Cambrian and Ordovician mature source rocks migrated to the north instead of south. The structural belts formed in the late Hercynian period on the Mengaiti Slope and the Bachu Uplift are favorable areas for hydrocarbon accumulation. The Hetianhe,Niaoshan,Bashituo,Yasongdi gas fields and the Haimiluosi gas-bearing structure have been discovered.
出处
《石油实验地质》
CAS
CSCD
北大核心
2016年第2期147-155,共9页
Petroleum Geology & Experiment
基金
国家重点基础研究发展计划"973"项目(2012CB214800)
国家科技重大专项(2008zx05002-003)资助
关键词
巴楚运动
不整合
抬升事件
石炭系
海西中期
塔西地区
塔里木盆地
Bachu Movement
unconformity
uplifting event
Carboniferous
middle Hercynian period
western Tarim Basin
Tarim Basin
