摘要
应用地震、地质相结合的研究方法,对鄂尔多斯盆地中部华庆地区的物源及源区母岩性质等进行了系统研究后发现,研究区存在东北和西南2个物源。东北方向的阴山物源控制着整个华庆地区长6段的沉积体系展布,是主要物源,母源区的变质岩性质和快速堆积使得沉积区砂岩以长石和岩屑含量较高为特征,成分及结构成熟度较低。西南方向物源受控于秦祁褶皱带,在研究区内影响较弱,是次要物源,所形成的沉积岩成分及结构成熟度较高,石英含量高于长石。2大物源体系交汇于西南部的白马—五蛟一带,物源的交汇对沉积体系的分布起到重要的控制作用,对水动能的影响导致在交汇区沉积相带分异不明显;不同的物源和沉积体系的交汇,对油气富集具有明显的分隔、控制作用。
Through the seismic and geological researches of the provenance and rocks properties in Huaqing area in central Ordos basin, it is recognized that there exist two provenances in northeast （Yinshan） and southwest directinns in this area. The former controls the distribution of Chang-6 deposit system of Huaqing area as a main souree, and its source area＇s ,netamorphic property and rapid accumulation allow the sandstone to be characterized by high content of feldspar and debris as well as low maturity of component and structure. The latter is controlled by Qinling-Qilian mountains fold belt, with relatively weak effect on this area as a secondary source, and characterized by quartz content higher than fehlspar and high maturity of component and structure of sedimentary rocks. Such two provenance systems are intersected ahmg Baimaujiao area in the southwestern Huaqing, which takes an important controlling part in distribution of the deposit system where the effect on hydrodynamic regime resuhs in unconspicuous differentiation of sedimentary facies in this intersection area. Also, the intersections between different sources and deposit system have obvious isolation and control effects on the hydrocarbon enrichment in this area.
出处
《新疆石油地质》
CAS
CSCD
北大核心
2013年第1期20-23,共4页
Xinjiang Petroleum Geology
基金
国家科技重大专项(2008ZX050442-8-2)
关键词
鄂尔多斯盆地
华庆地区
长6段
物源分析
物源交汇作用
油气富集
Ordos basin
Huaqing area
Chang-6 member
provenance analysis
provenance intersection
petroleum enrichment
