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鄂尔多斯盆地南部上三叠统延长组物源方向与沉积体系分析
引用本文:陈飞,樊太亮,高志前,于喜通,庞正炼.鄂尔多斯盆地南部上三叠统延长组物源方向与沉积体系分析[J].西安石油大学学报(自然科学版),2009,24(6).
作者姓名:陈飞  樊太亮  高志前  于喜通  庞正炼
作者单位:中国地质大学(北京)能源学院,北京,100083
基金项目:国家"973"规划项目,中国石化勘探北方分公司生产科研项目 
摘    要:运用古水流、重矿物特征研究、粒度分析、薄片骨架矿物成分分析等方法,对鄂尔多斯盆地南部上三叠统延长组的物源及源区母岩性质进行了系统研究,认为延长组存在有东北、西南、东南和西部4个方向物源.依据物源方向、沉积环境和岩石学特征,将鄂尔多斯盆地南部上三叠统延长组划分为曲流河三角洲、辫状河三角洲、湖泊和深水重力流4种沉积体系,即东北方向的富县三角洲、东南方向的庙湾-宜君-黄陵三角洲、西南方向的彬县-长武三角洲,以及正西方向的庆阳-合水三角洲.详细阐述了不同三角洲沉积体系和深水重力流沉积体系的演化过程,分析了沉积体系与油气的分布关系,认为油气主要富集在水下分流河道、河口坝及其叠合部位,以及深水区的砂质碎屑流和浊积体等能构成岩性圈闭的储集岩体内.沉积物源的研究和沉积体系演化的分析有助于油气勘探的部署.

关 键 词:鄂尔多斯盆地  延长组  物源方向  三角洲沉积体系

Analysis of the provenance direction and the depositional systems of Yanchang Formation of Upper Triassic in the southern Ordos Basin
CHEN Fei,FAN Tai-liang,GAO Zhi-qian,YU Xi-tong,PANG Zheng-lian.Analysis of the provenance direction and the depositional systems of Yanchang Formation of Upper Triassic in the southern Ordos Basin[J].Journal of Xian Shiyou University,2009,24(6).
Authors:CHEN Fei  FAN Tai-liang  GAO Zhi-qian  YU Xi-tong  PANG Zheng-lian
Abstract:Based on the study on the characteristics of the palaeocurrent and heavy mineral assemblages,the analysis of grain size and the characteristics of the sandstone framework mineralogy,the provenance and the characteristics of the mother rock during the deposition of the Yanchang Formation of Upper Triassic in the southern Ordos Basin are systemically studied.The results show that the studied area is affected mainly by four sediment sources.The delta deposition in the Yanchang Formation can be divided into four types of depositional systems according to the source direction,depositional environment and sandstone petrography,including meandering delta,braided delta,lacustrine and deep-water gravity flow.They are is Fuxian delta depositional system in the northeast,Miaowan-Yijun——Huangli delta depositional system in the southeast,Binxian-Changwu delta depositional system in the southwest and Qingyan——Heshui delta depositional system in the west in turn.The evolution process of different delta depositional systems and deep-water gravity flow and the relationship between the depositional systems and the hydrocarbon distribution are elaborated in detail.And it is shown that the hydrocarbon mainly distributes in the delta front subsea distributary channel,mouth bar and its superposition,turbidite sandstone body and sandy debris flow deposit,which are the most favorable sedimentary facies belt for the generation of Yanchang Formation reservoirs.The study results in this paper are useful to reasonable deployment of oil and gas exploration.
Keywords:Ordos Basin  Yanchang Formation  provenance direction  delta depositional system
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