The fraction of solar-type stars having stellar or massive nonstellar companions     

Clifford Bettis  Jerry Bonnell  David Branch 《Icarus》1977,32(4):461-463

The results of the survey for multiplicity by Abt and Levy are used to estimate the fraction of solar-type stars having close companions more massive than 0.01 solar masses. Current knowledge of the multiplicity characteristics of solar-type stars does not require that the fraction be nearly unity.  相似文献   

Tectonic Evolution and Hydrocarbon Potential in Northern Area of the South Yellow Sea     

姚永坚  陈春峰  冯志强  张拭颖  郝天珧  万荣胜 《中国地质大学学报(英文版)》2010,(1)

The northern area of the South Yellow Sea, located in the offshore region of China, resulted from the continental-continental collision orogeny during the Mesozoic and can be divided into four stages in terms of tectonic evolution: (1) pre-orogenic passive continental margin stage (Z-T2); (2) foreland basin stage corresponding with the late phase of the Sulu (苏鲁) orogeny (J3-K); (3) post-orogenic intracontinental rifted basin stage (K2t-E); and (4) regional subsidence and coverage stage (N-Q). Based on deta...  相似文献   

二连盆地白音查干凹陷下白垩统都红木组沉积特征及演化     

张志萍  林春明  徐深谋  李艳丽  岳信东  姚玉来  漆滨汶 《地层学杂志》2010,(3)

通过详细的岩芯观察、录测井资料分析,并结合区域地质资料和前人研究成果,对白音查干凹陷下白垩统都红木组的沉积相特征和沉积演化进行了深入研究。结果表明,白音查干凹陷主要发育扇三角洲相、辫状河三角洲相、浊积扇相和湖泊相4种沉积相类型。其中,扇三角洲和浊积扇在陡峭的北坡发育,辫状河三角洲在宽缓的南坡沉积,湖泊相分布在扇三角洲和辫状河三角洲的侧翼及凹陷的中心。都红木组沉积时期白音查干凹陷处于强裂陷向坳陷转化阶段。根据残留地层分布特征,其沉积演化可分为早、中、晚3个时期,从早期至晚期,扇三角洲和辫状河三角洲的面积不断缩小,分别后退了约3km和4-11km,湖泊沉积成为主体。  相似文献   

Two Types of Strike-Slip and Transtensional Intrabasinal Structures Controlling Sandbodies in Yitong Graben     

王家豪  陈红汉  王华  江涛  苗红波 《中国地质大学学报(英文版)》2011,(3)

Recently,the researches on structure controls on sandbodies have provided a new method for predicting petroleum reservoirs.The Yitong(伊通) graben is situated in the northern section of the Tan-Lu(郯-庐) fault system in eastern China.It was characterized by dual properties of strike-slip and extension in Cenozoic.Two types of intrabasinal structures were identified as oblique fault and trans-verse uplift in the graben.The oblique faults arranged en echelon in plain and locally presented nega-tive rosette struct...  相似文献   

松辽盆地南部片钠铝石形成与碎屑长石的成因联系   总被引：1，自引：0，他引：1  

刘娜  刘立  杨会东  杨天红  于淼 《吉林大学学报(地球科学版)》2011,41(1):54-63

含片钠铝石砂岩通常以富长石类型为主(岩屑长石砂岩,长石岩屑砂岩,长石砂岩)。为揭示片钠铝石与长石之间的主要赋存关系及长石在片钠铝石形成过程中所做的贡献,通过偏光显微镜、扫描电镜及阴极发光等镜下观察方法对松辽盆地南部红岗地区含片钠铝石砂岩进行了岩石学系统研究。本区片钠铝石主要以充填孔隙及交代颗粒的形式产出,其中片钠铝石交代斜长石的现象明显多于交代钾长石,片钠铝石交代斜长石初期优先沿其双晶缝向内生长,有些甚至完全交代斜长石而呈现交代假象。整体上片钠铝石含量与长石含量呈负相关关系。长石的溶蚀溶解为片钠铝石的形成提供Na+、Al 3+,由于各类长石的热力学性质存在差异,钾长石发生溶蚀溶解的速率及程度会明显低于斜长石,因此斜长石对形成片钠铝石的离子贡献大于钾长石。  相似文献   

A Potential Flood Hazard Caused by Tianchi Volcano Eruption in Changbai Mountain, Northeast China     

Neil B. McLaughlin 《山地科学学报》2011,(5)

Geohazards appear to be increasing in frequency globally. It is of necessity to actively manage these natural hazards to minimize loss of life and property. From an early warning perspective, this paper stresses the potential fatal flood hazard represented by the huge volume of water in Tianchi Lake, the unique geography of Changbai Mountain, and the limited flood control ability in the upstream of the Songhua River. Northeast Asian countries should keep a watchful eye on the Changbai volcano cooperatively,...  相似文献   

乌石凹陷流沙港组成岩作用及其孔隙演化     

刘冲  朱定军  苏文辉  陈金定 《地质与资源》2013,22(5):426-430

通过铸体薄片鉴定、X射线衍射、扫描电镜以及镜煤等多种实验手段对乌石凹陷流沙港组砂岩成岩作用及孔隙演化做了详细研究.结果表明:乌石凹陷流沙港组二段、三段岩石类型主要为石英砂岩,少量长石石英砂岩,粒级分选中等偏差.砂岩的成岩强度均已达到中成岩阶段A期.孔隙类型以原生粒间孔和次生溶蚀孔隙为主,压实作用、胶结作用等减少原生粒间孔隙,溶蚀作用产生大量的次生溶孔,改善储集层物性.  相似文献   

库车前陆盆地天然气成藏过程及聚集特征   总被引：10，自引：5，他引：5  

赵孟军  王招明  张水昌  王清华  宋岩  柳少波  秦胜飞 《地质学报》2005,79(3):414-422

天然气的组分和碳同位素主要受母质类型和成熟度双重因素的控制,这是我们研究天然气的基础。但是越来越多的证据显示成藏过程对天然气组分和碳同位素也具有明显的控制作用。尽管库车前陆盆地不同构造单元的天然气来源一致,即主要来源于侏罗系烃源岩、其次为三叠系烃源岩,但是库车前陆盆地冲断构造带、斜坡区和前缘隆起区在天然气组分、干湿程度和碳同位素组成上具有明显的差异。库车前陆盆地经历了早期油气的聚集、破坏和晚期天然气聚集、调整的过程,研究认为成藏过程对库车前陆盆地不同构造单元的天然气组分和碳同位素特征具有明显的控制作用。  相似文献   

Differential Tectonic Deformation of the Longmen Mountain Thrust Belt,Western Sichuan Basin,China   总被引：1，自引：1，他引：0  

TANG Liangjie YANG Keming JIN Wenzheng WAN Guimei L Zhizhou YU Yixin State Key Laboratory of Petroleum Resource  Prospecting  Beijing  China Key Laboratory for Hydrocarbon Accumulation Mechanism  China University of Petroleum  Ministry of Education  China Basin  Reservoir Research Center. China University of Petroleum  China Southwest Branch Company  SINOPEC  Chengdu  Sichuan    China 《《地质学报》英文版》2009,83(1)

Field investigation and seismic section explanation showed that the Longmen Mountain Thrust Belt has obvious differential deformation:zonation,segmentation and stratification.Zonation means that,from NW to NE,the Longmen Mountain Thrust Belt can be divided into the Songpan- Garz(?) Tectonic Belt,ductile deformation belt,base involved thrust belt,frontal fold-thrust belt,and foreland depression.Segmentation means that it can be divided into five segments from north to south: the northern segment,the Anxia...  相似文献   

Tectonic Evolution of the Tianhuan Depression and the Western Margin of the Late Triassic Ordos   总被引：2，自引：1，他引：1  

LI Xiangbo  LIU Huaqing  WANYAN Rong  WEI Lihu  LIAO Jianbo  FENG Ming  MA Yuhu  BAI Yunlai 《《地质学报》英文版》2009,83(6):1136-1147

Abstract: The Ordos Basin is one of the most important oil and gas basins in China. Based on surface outcrop, key exploratory wells and seismic reflection data and by using the technology of “prototype basin recovery”, seismic profile “layer flattening” and “restoration of balanced section”,and other methods, the sedimentary boundary, structure and the evolution history of the Tianhuan depression on the western margin of the Ordos Basin are reestablished. The following results have been obtained. (1) The west boundary of the Late Triassic Ordos Basin was far beyond the scope of the current basin. The basin is connected with the Late Triassic Hexi Corridor Basin, and its western margin did not have tectonic characteristics of a foreland basin. (2) The Tianhuan depression was first formed in the Late Jurassic. At the late stage it was impacted by the late Yanshanian and Himalayan tectonic movement and the depression axis gradually moved eastwards to the present location with a cumulative migration distance of ~30 km. (3) Eastward migration of the depression axis caused adjustment and even destruction of the originally formed oil and gas reservoirs, so that oil and gas remigrated and aggregated, resulting in secondary structural reservoirs formed at high positions on the western flank of the depression.  相似文献