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根据川东石炭系实钻资料,结合前人资料对石炭系地层—构造复合圈闭进行了分类和总结;在此基础上,对川东石炭系地层—构造复合圈闭的控制因素进行了研究。研究表明沉积相是地层—构造复合圈闭的次要控制因素,而古岩溶、古构造是其主要控制因素;在此过程中,根据黄龙纽残余厚度分布状况提供的岩溶剥蚀强度信息、经压实恢复上覆梁山组碳质泥岩等厚度图反映的黄龙组顶面侵蚀地形变化印模及由岩溶相组合特征所显示的古水文条件,恢复了川东地区黄龙组古岩溶地貌。在分析古岩溶地貌单元古水文状况、溶蚀方式和强度、古构造及古岩溶厚度的基础上,对川东内古岩溶进行了区块划分。最后综合了各种资料,对川东石炭系地层—构造复合圈闭有利区带进行了预测。 相似文献
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The Coolgarra Batholith in north‐east Queensland is composed of the Go Sam and Nettle granite suites which were emplaced approximately 314 Ma ago. Initial 87Sr/86Sr ratios of the Nettle Suite appear to be marginally above 0.710, a value characteristic of a wide range of Late Palaeozoic felsic igneous rocks in the region. This suite appears to have been derived from an extensive isotopically homogeneous crustal source distinct from rocks which crop out in the Palaeozoic Hodgkinson Basin or Precambrian Georgetown Inlier. Higher and more variable initial 87Sr/86Sr ratios (0.727–0.744) of the Go Sam Suite are attributed to a combination of magmatic and hydrothermal processes. Isotopic data, thus, cannot be used to constrain the nature of the Go Sam source rocks. Tungsten (with or without tin) mineralization is associated with the Nettle Suite plutons, with which it shares a common age, whereas the Go Sam Suite is characterized by prominent tin mineralization. One tin occurrence is the same age as, or only slightly younger than, the Nettle Suite tungsten (with or without tin) mineralization. Another tin deposit yields an age of 301 Ma, suggesting the presence of a significantly younger granite at depth. 相似文献
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浙江江山藕塘底组陆源碎屑与碳酸盐混合沉积特征及其构造意义 总被引:17,自引:3,他引:14
浙江江山藕塘底组是晚石炭世威宁期陆源碎屑与碳酸盐的混合沉积,包括两种组分在同一岩层内相互混杂形成混积岩和陆源碎屑岩与碳酸盐岩互层形成混积层系。藕塘底组是海陆交互环境的沉积产物,剖面结构具有下细上粗的岸进序列。混积岩形成于滨岸浅滩环境,由沿岸流和回流将河口或滨岸海滩的石英砂带到滨岸浅滩和潮坪相碳酸盐沉积区混杂而成。具两种混积层系类型,即浅海滨岸环境中砂岩与碳酸盐岩互层、河流相碎屑岩与海相碳酸盐岩互层。研究表明,混合沉积成因属“相混合”,主要受区域构造隆升、全球海平面上升和盆地水介质条件特性控制。区域海平面周期性变化和岸进序列可能是华夏古陆强烈隆起的结果。作者还讨论了混合沉积的分类和命名,将陆源碎屑与碳酸盐层相互交替构成的互层和夹层组合称为“混积层系”,并建议将“混积岩”一词用来表征两种组分相互混杂这种特殊沉积事件,而不用作具体岩石名称. 相似文献
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临沧锗矿含碳硅质灰岩的成因及其与锗成矿的关系 总被引:5,自引:1,他引:5
临沧锗矿是我国近年发现的具有独立开采价值且接近超大型规模的锗矿床,其富锗含煤段中存在薄层含碳硅质灰岩,深入研究含碳硅质灰岩的成因对于揭示锗矿床的成因具有重要的意义。通过对薄层含碳硅质灰岩岩石化学、微量元素、稀土元素和碳、氧同位素的系统研究,并与典型的陆相热水沉积物进行对比,得出以下初步认识:(1)含碳硅质灰岩属陆相热水沉积成因;(2)含碳硅质灰岩的微量元素和稀土元素可能主要来自基底的二云母花岗岩;(3)煤中锗主要由形成含碳硅质岩等热水沉积岩的热水带来。 相似文献
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郑春子 《吉林大学学报(地球科学版)》1986,(3)
本文研究了黔西、桂北威宁组的皱纹珊瑚26属、45种,并对其中的1新属、14新种进行了描述。据珊瑚化石的研究将该区的中石炭统自下而上划分为两个组合:1.Darwcsophyllum—Paracarruthersella组合;2.Acrocyathus—Shuichengophyllum组合。 相似文献
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Kalagang Formation is developed widely in the Santanghu basin, northeast Xinjiang. The eruption age of volcanic rocks in this Formation was considered as either Permian or Carboniferous. LA-ICP-MS U-Pb dating was made on the basaltic zircons for three samples, which were collected from drill hole (Ma 17) at different depths. Zircons in the basalt at 1543.1 m yield weighed mean age of 343. 5±2. 4 Ma (n = 11, MSWD = 0. 74). Those at 1954. 3 m show two groups of weighted mean ages, 331. 3±5. 0Ma (n = 6, MSWD = 1.4) and 306. 6±5. 3 Ma (n = 9, MSWD= 4. 5), respectively. Zircons in the sample at 2327. 0 m give weighted mean age of 325. 2±3. 0 Ma (n = 19, MSWD = 2. 2). This study considers the minimum age, 306. 6 Ma, as the eruption age of the volcanic rocks in the Kalagang Formation, suggesting that this volcanic suite was formed in Carboniferous instead of formerly widely-accepted Permian. Zircons at the higher depth of the drill hole are old (early Carboniferous) , Zircons at the lower depth are younger (Late Carboniferous). This may indicate that volcanic rocks in Malang depression developed within different ages, showing a characteristic of multi-stage eruption, old zircons at the higher depth of Kalagang Formation may represent the early magma crystallization. Therefore, Kalagang Formation should be formed at the Late Carboniferous. 相似文献
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塔河油田3区石炭系超深储层油藏描述研究 总被引:1,自引:0,他引:1
塔河油田3区石炭系储层为一套浅海~滨海相碎屑岩沉积层系,主含油层位为卡拉沙依组砂泥岩互层段,发育有不等厚薄互层状油藏,具有埋藏深、单层厚度小、砂体分布不稳定、油水层相间分布、成藏条件复杂等特点.针对含油储层薄、砂体追踪对比困难等问题,在提高地震分辨率基础上,通过井震标定及三维地震精细解释,进行了含油砂体展布研究.利用拟... 相似文献
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近年来,在塔河油田老区直井基础上进行177.8 mm套管开窗(149.2 mm井眼)侧钻是主要开发方向之一。石炭系卡拉沙依组锻铣开窗存在循环压耗大,铁屑上返排量窗口窄,铁屑容易在锻铣套管上窗口堆积,易发生铁屑憋泵、缠刀、退刀困难,侧钻时地层压实性好,机械钻速低,井壁掉块卡钻,穿越两套压力体系井漏,摩阻扭矩大等复杂情况。在TK665CH井石炭系卡拉沙依组177.8 mm套管锻铣开窗侧钻施工中,通过钻头、钻进参数、导向马达、钻具组合的优选,轨迹的监控以及针对性的泥浆技术,侧钻获得成功,为塔河油田老井改造及定向侧钻积累了成功的经验。 相似文献