摘要
采用垂向构造变动强度定量计算方法对塔里木盆地台盆区中奥陶统底界在志留纪末—二叠纪末、二叠纪末—侏罗纪末和侏罗纪末—现今3个主要构造变动期的垂向构造变动强度进行了定量计算.3个构造变动期内,中奥陶统底界分别呈现出"东抬西降、沉降为主"、"东西抬升、中间稳定、抬升为主"和"整体沉降"的垂向构造变动特征,绝对强度和相对强度分别为-8～20 m/Ma和-0.2～0.9、-36～8 m/Ma和-0.9～0.2以及-4～40 m/Ma和-0.1～1.其中,对于油气成藏具有重要作用的2个变动期(志留纪末—二叠纪末和侏罗纪末—现今)均发育以沉降作用为主的构造变动,且侏罗纪末—现今的构造沉降绝对强度远远大于志留纪末—二叠纪末.而构造变动相对强度分析认为,塔里木盆地台盆区主要含油气区大多发育在每期构造变动的相对稳定地带(枢纽带),具有相对于生烃坳陷较高的构造位置,以及相对较小的变动强度,因此是油气运聚的有利指向区和保存区.
The vertical tectonic varying intensity in the basal boundary of Middle Ordovician in the platform area of Tarim Basin in three main tectonic varying periods(the end of Silurian to the end of Permian,the end of Permian to the end of Jurassic,the end of Jurassic to present)is quantitatively calculated using the quantitative calculation method of vertical tectonic varying intensity.It is shown that,in three tectonic varying periods,the basal boundary of Middle Ordovician presents the feature of 'uplifting in east and subsiding in west,subsidence being dominated','uplifting in east and west,subsiding in middle,uplift being dominated',and 'subsiding as a whole' separately.The absolute varying intensity is-8～20 m/Ma,-36～8 m/Ma and-4～40 m/Ma separately,and the relative varying intensity is-0.2～0.9,-0.9～0.2 and-0.1～1 separately.There is the tectonic varying in which subsidence is dominated in tow main hydrocarbon accumulation periods(the end of Silurian to the end of Permian,the end of Jurassic to present),and the absolute varying intensity from the end of Jurassic to present is much more than that from the end of Silurian to the end of Permian.According to the relative tectonic varying intensity,it is held that the main oil-bearing areas in the platform area of Tarim Basin distribute mainly in the relative stable zones of the tectonic varying,where are in higher tectonic position than hydrocarbon generating depressions,there is less tectonic varying intensity,so where are the favorable objective area of hydrocarbon migration and accumulation.
出处
《西安石油大学学报（自然科学版）》
CAS
北大核心
2011年第2期13-19,117-118,共7页
Journal of Xi’an Shiyou University（Natural Science Edition）
基金
国家重点基础研究发展计划(973计划)项目(编号:2005CB422108)
中央高校基本科研业务费专项资金资助项目(编号:2009PY18)资助
关键词
塔里木盆地
中奥陶统底界
垂向构造变动强度
定量研究
Tarim Basin
the basal boundary of Middle Ordovician
vertical tectonic varying intensity
quantitative study
