物源交汇作用对油气富集的影响——以鄂尔多斯盆地中部华庆地区长6段沉积期为例
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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 directions in this area.The former controls the distribution of Chang-6 deposit system of Huaqing area as a main source,and its source area's metamorphic 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 feldspar and high maturity of component and structure of sedimentary rocks.Such two provenance systems are intersected along Baima-Wujiao area in the southwestern Huaqing,which takes an important controlling part in distribution of the deposit system where the effect on hydrodynamic regime results 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.
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 directions in this area.The former controls the distribution of Chang-6 deposit system of Huaqing area as a main source,and its source area's metamorphic 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 feldspar and high maturity of component and structure of sedimentary rocks.Such two provenance systems are intersected along Baima-Wujiao area in the southwestern Huaqing,which takes an important controlling part in distribution of the deposit system where the effect on hydrodynamic regime results 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.
引文
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[11]邹才能,赵政璋,杨华,等.陆相湖盆深水砂质碎屑流成因机制与分布特征——以鄂尔多斯盆地为例[J].沉积学报,2009,12(6):1065-1072.
[12]李相博,陈启林,刘化清,等.鄂尔多斯盆地延长组3种沉积物重力流及其含油气性[J].岩性油气藏,2010,22(3):16-20.
[13]李树同,王多云,陶辉飞,等.鄂尔多斯盆地延长组坡折带对岩性油藏的控制作用[J].新疆石油地质,2009,30(1):53-56.
[14]雷晓兰,赵靖舟,刘昊伟,等.鄂尔多斯盆地陕北斜坡东部三叠系长6油藏分布规律[J].新疆石油地质,2008,29(6):706-709.
[15]白玉彬,赵靖舟,罗静兰,等.陕北斜坡东部蟠龙油田长6油藏形成条件及勘探方向[J].新疆石油地质,2011,32(6):694-696.
[2]赵俊兴,陈洪德,向芳.鄂尔多斯盆地中部延安地区中侏罗统延安组高分辨率层序地层研究[J].沉积学报,2003,21(2):307-312.
[3]聂永生,田景春,夏青松,等.鄂尔多斯盆地白豹-姬塬地区上三叠统延长组物源分析[J].油气地质与采收率,2004,11(5):4-6.
[4]蔺宏斌,姚泾利.鄂尔多斯盆地南部延长组沉积特性与物源探讨[J].西安石油学院学报(自然科学版),2000,15(5):7-9.
[5]宋凯,吕剑文,杜金良,等.鄂尔多斯盆地中部上三叠统延长组物源方向分析与三角洲沉积体系[J].古地理学报,2002,4(3):67-73.
[6]张承泽,原海涛,杨琴.富县地区延长组6段沉积特征研究[J].重庆石油高等专科学校学报,2004,10(4):8-10.
[7]刘化清,廖建波,房乃珍,等.鄂尔多斯盆地环县地区长6沉积体系展布特征[J].沉积学报,2005,23(4):584-588.
[8]高瑞祺,蔡希源.松辽盆地油气田形成条件与分布规律[M].北京:石油工业出版社,1997:47-103.
[9]刘立,胡春燕.砂岩中主要碎屑成分的物源区意义[J].沉积与特提斯地质,1991,11(6):48-52.
[10]王峰,田景春,张锦泉,等.鄂尔多斯盆地中西部延长组长6油层组物源分析[J].沉积与特提斯地质,2006,26(3):26-29.
[11]邹才能,赵政璋,杨华,等.陆相湖盆深水砂质碎屑流成因机制与分布特征——以鄂尔多斯盆地为例[J].沉积学报,2009,12(6):1065-1072.
[12]李相博,陈启林,刘化清,等.鄂尔多斯盆地延长组3种沉积物重力流及其含油气性[J].岩性油气藏,2010,22(3):16-20.
[13]李树同,王多云,陶辉飞,等.鄂尔多斯盆地延长组坡折带对岩性油藏的控制作用[J].新疆石油地质,2009,30(1):53-56.
[14]雷晓兰,赵靖舟,刘昊伟,等.鄂尔多斯盆地陕北斜坡东部三叠系长6油藏分布规律[J].新疆石油地质,2008,29(6):706-709.
[15]白玉彬,赵靖舟,罗静兰,等.陕北斜坡东部蟠龙油田长6油藏形成条件及勘探方向[J].新疆石油地质,2011,32(6):694-696.
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