不同岩性火山岩力学性质实验研究

黄沙坨地区位于辽河断陷盆地东部凹陷中段,古近纪沙河街组第三段沉积时期发育了巨厚的火山岩,为该区形成火山岩油气藏奠定了成藏条件。由于油层岩石的力学性质,影响着油田生产,因此,经过实验室对不同岩性的火山岩力学性质的试验测试,得到油田生产所需的相关的力学参数及相关的地质信息,为油田勘探、开发及相关的工程设计发挥重要作用。试验结果表明,粗面岩以张性破裂为主,玄武岩以剪切破裂为主。这对油田研究水力压裂裂缝形态及储层天然裂缝形态提供了重要的地质依据。软化系数的较大波动,表现出地下流体对油层岩石的环境作用。     

辽西中生代软流圈底辟体的脉动式上涌

岩石学-地球化学数据揭示了辽西中生代火山岩组分存在的3个特征: (1) Mg#值和Cr、Ni含量比较高; (2) 多数火山岩源自受到地壳物质混染的富集的岩石圈地幔; (3) 相当部分火山岩的ε_Nd(t)值偏高.对辽西及其邻区中生代(230~65Ma) 火山岩年代学的研究发现: 火山活动具有平均间隔2030Ma的周期性, 火山岩活动的峰期为230Ma、190Ma、160Ma、130120Ma、110100Ma、80Ma.同时火山岩ε_Nd(t)值在时间上显示了类似的周期性波动.在空间上, 中、新生代火山岩有呈环状分布的趋势, 从中心向外逐渐变新.根据上述特点, 提出辽西晚中生代的火山岩活动可能与软流圈底辟体脉动式上涌有关, 研究区被岩石圈断裂围限的特定构造背景为软流圈底辟体的上涌提供了天然通道.      

安徽省庐江县火山岩分布区崩塌特征及防治对策研究

通过分析研究区内崩塌形成的地形地貌、气象水文及地质构造等条件,提出针对性防治对策及建议,为地质灾害早期识别和防治管理提供依据。研究表明,两处火山岩分布区崩塌主控条件为地质构造,次要条件为岩体结构和风化程度。庐枞盆地火山岩主控节理走向以北西-北北西向为主,崩塌岩体多呈碎裂结构及散体结构;北淮阳火山岩主控节理走向以北东-北北东向为主,崩塌岩体多呈块状结构及碎裂结构。崩塌地质灾害主要发生在居民切坡建房及道路切坡形成的人工边坡,一般威胁对象主要为居民点或道路过往行人及车辆,因其点多面广,建议采取源头控制、重点治理及群防群策等措施进行防治。     

Report on 34 Ga SHRIMP Zircon Age from the Yuntaishan Geopark in Jiaozuo, Henan Province

1 Introduction According to recent researches, the North China Craton consists of three parts: the eastern block, western block and central zone (Zhao, 2001; Wilde et al., 2002). Paleoarchean continental blocks and zircon residuals have only been found in a few regions, such as Anshan, East Liaoning (Liu et al., 1992; Song et al., 1996; Wan et al., 2002, 2005), Caozhuang, East Hebei (Liu et al., 1992) and Xinyang, West Henan (Zheng et al., 2004), which are mainly distributed in the east…     

Mesozoic Bimodal Volcanic Suite in Zhalantun of the Da Hinggan Range and Its Geological Significance： Zircon U-Pb Age and Hf Isotopic Constraints

1 Introduction Mesozoic volcano-intrusive rocks are widely distributed in the Da Hinggan Range of northeastern China, and are considered as one of the most spectacular geological sights in eastern Asia. Recently, studies on granites with high εNd(t) values and Phanerozoic crustal growth in the Centra Asian Orogenic Belt have greatly promoted fundamental research into the geology of this area (Jahn et al., 2000, 2001, 2004; Wu et al., 2000, 2002, 2003). However, work on the eruption time,…     

中国南海北部珠江口-琼东南盆地钻井岩屑地球化学特征及深水区天然气聚集特征

The Qiongdongnan Basin and Zhujiang River(Pearl River) Mouth Basin, important petroliferous basins in the northern South China Sea, contain abundant oil and gas resource. In this study, on basis of discussing impact of oil-base mud on TOC content and Rock-Eval parameters of cutting shale samples, the authors did comprehensive analysis of source rock quality, thermal evolution and control effect of source rock in gas accumulation of the Qiongdongnan and the Zhujiang River Mouth Basins. The contrast analysis of TOC contents and Rock-Eval parameters before and after extraction for cutting shale samples indicates that except for a weaker impact on Rock-Eval parameter S_2, oil-base mud has certain impact on Rock-Eval S_1, Tmax and TOC contents. When concerning oil-base mud influence on source rock geochemistry parameters, the shales in the Yacheng/Enping,Lingshui/Zhuhai and Sanya/Zhuhai Formations have mainly Type Ⅱ and Ⅲ organic matter with better gas potential and oil potential. The thermal evolution analysis suggests that the depth interval of the oil window is between 3 000 m and 5 000 m. Source rocks in the deepwater area have generated abundant gas mainly due to the late stage of the oil window and the high-supper mature stage. Gas reservoir formation condition analysis made clear that the source rock is the primary factor and fault is a necessary condition for gas accumulation. Spatial coupling of source, fault and reservoir is essential for gas accumulation and the inside of hydrocarbon-generating sag is future potential gas exploration area.     

诺敏大黑沟组火山岩形成机制的稀土判别

诺敏火山群位于大兴安岭中北段东坡,行政区划属内蒙古自治区管辖,分布在诺敏河、毕拉河、奎勒河一带,主要受南北向、东西向及其派生的北东向和北西向断裂控制,沿河谷及两侧低山地带分布。由43个火山锥（口）及10片岩流构成。区内出露晚更新世大黑沟组火山岩。主要岩性为碱性玄武岩,气孔状、致密块状（橄榄）玄武岩、白榴玄武岩、玄武质浮岩等。     

霍吉河铜及多金属矿找矿规律初探

一、地质特征 1．地层 出露有晚二叠统五道岭组弱变质流纹岩及中基性火山岩,下白垩统宁远村组、中酸性火山岩和板子房组中基性火山岩。     

闽煤地质局找煤瞄准“三下”在构造推覆体下、红层下、火山岩下实现找煤突破

《国务院关于支持福建省加快建设海峡西岸经济区的若干意见》出台后,福建省煤田地质局随即出台了18条贯彻实施意见,提出要努力实现地质找矿的重大突破,“十一五”期间,提交煤炭资源储量2．8亿t以上,超额完成提交2．2亿t的目标任务;“十二五”期间,提交煤炭资源储量2．5亿t以上;     

Distribution and characteristics of volcanic reservoirs in China

About forty productive oil/gas fields hosted in volcanic reservoirs have been found since 1957 in fourteen basins of China. They can be simply subdivided into two groups, the east and the west. Reservoir volcanic rocks of the east group are predominantly composed of Late Jurassic to Early Cretaceous rhyolite and Tertiary basalt, preferred being considered as rift type volcanics developed in the circum-Pacific tectonic regime. Those of the west are Permo-Carboniferous intermediate/basic volcanic rocks, being island-arc type ones developed in paleo-Asian Ocean tectonic regime.