二连盆地巴音都兰凹陷早白垩世构造岩相带特征及含油性   总被引：6，自引：4，他引：6       下载免费PDF全文

崔周旗  吴健平  李莉  王海潮 《古地理学报》2001,3(1):25-34

在系统观察岩心的基础上，从单井相分析入手，结合地震相和测井相模式，以及大量岩矿、粒度等分析化验资料，对巴音都兰凹陷下白垩统巴彦花群的物源方向、沉积体系、构造岩相带及含油性进行了研究。认为区内具有东、西两大物源区、五大水系控制着十一个砂体的平面展布，最终，划分了扇三角洲等五种沉积体系，总结出具平台型陡坡扇三角洲等六种构造岩相带，并着重对有别于典型单断箕状凹陷的三种构造岩相带的含油性进行了初步探讨。  相似文献   

碎屑颗粒磷灰石裂变径迹法在制约地层年龄中的应用   总被引：5，自引：0，他引：5  

郑德文  张培震  万景林 《矿物岩石地球化学通报》2001,20(4):465-467

碎屑颗粒热年代学是 2 0世纪 80年代以来发展起来的一种热年代学方法 ,在地质研究中应用广泛。本文以西秦岭地区三岔—四店一带的白垩纪地层为例 ,说明该方法在制约地层年龄中的应用。结果表明这一带的白垩系地层沉积于晚白垩纪 ,或至少含有晚白垩纪的沉积。  相似文献   

Paleostress orientation from 3-D orientation distribution of microcracks in quartz from the Cretaceous granodiorite core samples drilled through the Nojima Fault, south-west Japan   总被引：1，自引：0，他引：1  

Toru Takeshita  Koshi Yagi 《Island Arc》2001,10(3-4):495-505

Abstract The orientations of both healed extension microcracks and microcracks in quartz grains sealed mostly by carbonate minerals were measured from Cretaceous granodiorite core samples drilled along the Nojima Fault, southwest Japan. The preferred orientations of both healed and sealed microcracks consist of approximately three orthogonal sets, (components) A, B and C, in which A strikes NS–NW-SE and dips vertically, B strikes EW–NE-SW and dips vertically, and C is subhorizontal. Both the healed and sealed microcracks were possibly formed by hydraulic fracturing, and the successive release of tensile stress due to pore fluid overpressure in the principal stress directions could have caused this microcracking in mutually orthogonal directions. The quartz grains are also very moderately plastically deformed, which is indicated by the occurrence of kink bands and undulose extinction. The association of healed microcracks and kink bands in the quartz suggests that these microstructures formed under subgreenschist facies conditions (≈300°C) during hydrothermal activity that could have occurred immediately after the emplacement of granodiorite during the Late Cretaceous period. Based on both the preferred orientation of microcracks, and c-axis fabrics of kinked and unkinked grains (so called kink method), it is inferred that the σ₁-and σ₃-axis were oriented horizontally in NS–NW-SE and EW–NE-SW directions, respectively. The inferred paleostress field does not conform to the east–west-trending compression during the Quaternary period, but to the activation of EW–NE-SW-trending, left–lateral strike–slip faults during the Late Cretaceous period in southwest Japan.  相似文献   

Regularity of paleowind directions of the Early Cretaceous Desert in Ordos Basin and climatic significance     

Jiang Xinsheng  PAN Zhongxi  Fu Qingping 《中国科学D辑(英文版)》2001,44(1):24-33

By the measurement of the wind directional indicator of the Cretaceous desert in Ordos Basin, the regularity of the paleoprevailing wind directions and pattern of the paleowind belts are revealed. It is considered that the desert was controlled by a planetary wind system. In the early stage, the subtropical high pressure zone drifted south and northwards with short cycles, resulting in the alternation of westerlies and northeast trades; in the late stage, the subtropical high pressure zone drifted southwards with a long cycle, placing the desert under the westerly belt and making the desert completely controlled by the westerly belt. The reconstruction of the paleowind belts has provided the evidence of the general circulation of the atmosphere for the pattern of the circulation before the uplift of the Tibetan Plateau  相似文献   

早元古代碳同位素突变的发现   总被引：3，自引：0，他引：3       下载免费PDF全文

钟华  马永生 《地质学报》1995,69(2):185-191

本文较详细较系统地研究了早元古代碳酸盐岩的碳同位素组成。样品采自山西五台县滹沱群建安村组，大关洞组和槐荫村组。平均采样间距６。９ｍ，分析样品总数２０９个，所分析的样品全部为泥晶白云岩。碳同位素分析结果，清楚地显示了建安村组一大关洞组界线处以及大关洞组一槐荫村组界线附近碳同位素突变的存在。这次在前寒武系中发现的碳同位素突变，与白垩系－第三系、二叠系－三叠系、寒武系－前寒武系等界线层碳同位素突变类似。  相似文献   

Cretaceous-Eogene Ostracod Assemblages in Henan and Their Evolutionary Features     

Zhang Shen Jidong Oil Exploration &. Development Corp.  Tanghai  Hebei Fei Zhenbi 《《地质学报》英文版》1995,69(1):99-110

This paper studies a large number of Cretaceous-Eogene ostracod fossils in the Meso-Cenozoic Nanyang, Zhoukou, Rendian, Luoyang, Lingbao, Tantou and Kaifeng basins of Henan. Eight ostracod assemblages have been recognized. This paper discusses their geographical distribution and geological ages as well as their features and evolutional trends. Besides, it also deals with the palaeoclimate under which the various assemblages lived and the significance in petroleum exploration.  相似文献   

白垩系叶赫组及其外延的讨论     

刘茂强 《吉林大学学报(地球科学版)》1995,(3)

研究了叶赫组的层序、环境类型、生物群特征及外延后认为，叶赫组在大黑山东南侧、伊通－舒兰地堑及其周边均有不同程度的发育，基本上是泉头组之后至嫩江组之间的同期异相沉积。  相似文献   

四川雅安地区早第三纪地层     

赵兵  李勇 《地层学杂志》1995,19(2):96-103

下第三系名山组广泛分布于雅安地区，地层出露良好。本文简要介绍雅安国光山背斜东西两翼新测的地层剖面，将名山组（包括芦山组）划分成４段（砂岩粉砂岩段、粉砂岩泥岩泥灰岩段、泥岩粉砂岩段、泥岩段），并将芦山组归于名山组上部（Ⅳ段），从而取消该名称，综述了岩石组合特征、沉积环境，进行了生物地层和年代地层划分。  相似文献   

造缝产烃还是改质造烃？——论含油气源岩层系的储集层属性和烃源岩属性     

杨智  邹才能  吴松涛  潘松圻  李嘉蕊  蒋文琦  王小妮 《地质学报》2022,96(1):183-194

源岩层系油气已成为世界油气工业体系中举足轻重的重点领域，未来发展潜力很大。本文通过深入解读含油气源岩层系的地质形成条件，发现储集层属性和烃源岩属性在根本上决定了源岩层系油气成功开发的技术路径。储集层属性是指储集层储存和渗滤油气的物理性质及其相互关系，地史时期微—纳米级孔- 喉- 缝系统充注和聚集了大面积连续型油气资源，人工压裂形成缝网系统突破了致密储层的连通属性短板，成功开发了规模油气资源，突破流动属性短板可能是另一个发展方向。烃源岩属性是指烃源岩滞留、转化和排出油气的物理化学性质及其相互关系，包括已转化的滞留油气和未转化的残留有机质，滞留及潜在烃类资源规模巨大，地下人工加热等方式理论上可突破烃源岩的有机质数量和成熟度属性短板，可能是实现成功开发的有效路径。储集层属性和烃源岩属性是实现源岩层系油气规模发展的内在潜质基础，公共属性参数是外部环境基础。造缝产烃还是改质造烃？前提是准确研判优选何种内在属性参数，基础是系统整合优化所有外在属性参数，推动实现源岩层系油气商业化可持续发展，未来中低熟富有机质页岩及油页岩、中高熟富气态烃页岩层系、低变质程度富油煤岩、深层可气化煤炭等是值得期待的战略发展领域。  相似文献   

拉萨地块林周盆地下白垩统塔克那组：新特提斯洋活动陆缘伸展阶段沉积记录     

刘航宇  石开波  刘波  宋本彪  刘卓 《地质学报》2022,96(3):783-804

拉萨地块林周盆地下白垩统塔克那组沉积于新特提斯洋壳向拉萨地块俯冲的弧后伸展环境，对重构该时期古地理格局、理解活动陆缘伸展构造对沉积的控制作用具有重要意义。基于野外露头描述和薄片观察，总结塔克那组岩石地层、岩石学和古生物特征，对比同期新特提斯被动陆缘阿拉伯板块Shuaiba组，讨论塔克那组沉积演化和活动陆缘沉积特征。塔克那组发育碎屑岩、硅质碎屑- 碳酸盐混积岩、碳酸盐岩三大类沉积岩十种岩石类型，纵向上划分为四个岩性段，是一个三级相对海平面变化旋回的沉积层系。塔一段砂岩—混积岩—灰岩岩性变化、沉积构造和生物类型均指示潮间- 潮下带潟湖环境；塔二段沉积于海平面快速上升期，主要为风暴浪基面之下厚层泥灰岩；塔三段在玛行西剖面首次识别出代表风暴浪基面之上的风暴成因生物富集层，往西南在甲绒东剖面相变为浅滩相生屑/鲕粒颗粒灰岩；塔四段沉积期海平面持续下降，海水逐渐退出盆地，沉积滨岸和泛滥平原环境的泥页岩夹粉砂岩。与阿拉伯板块同期生物种属对比表明，塔克那组沉积期，南拉萨地块林周盆地与新特提斯洋沟通性好。活动陆缘伸展背景下，具有基底快速差异沉降、陆源沉积物持续输入的特征，导致纵、横向相变快，混积岩发育，厚壳蛤、Lithocodium- Bacinella等浅海喜净水生物和深水浮游生物欠发育。  相似文献