马岭—镇北地区延长组长8油组的砂体类型与多层叠置的连续型油藏特征     

孟祥宏  王多云  李树同  李建霆  刘军锋  张其超  左博 《沉积学报》2011,29(6):1206-1212

重点通过对马岭—镇北地区长8油藏储层的研究,将研究区长8油藏的储层砂体类型划分为2大类4小类：水道砂体（水下分流河道、水下深切水道、扇内水道）、河口坝砂体。在其它成藏条件的有机配置下,形成了以上述4种类型砂体为储层的多层叠置的连续型油藏。其特征为：①油藏分布在湖盆斜坡和中心位置的砂体连片叠置的沉积体系中;②4类储层单砂...  相似文献   

塔里木盆地中部航磁异常带新解译   总被引：5，自引：0，他引：5       下载免费PDF全文

何碧竹焦存礼  蔡志慧张 淼 高爱荣 《中国地质》2011,38(4):961-969

横亘于塔里木盆地中部的纬向航磁高ΔTa异常带,一直是探讨盆地及深部基底的物质组成及结构构造的焦点。根据钻井及地震资料综合分析,发现满加尔坳陷中南部上奥陶统内发育大型地震反射异常体,平面上主要由8个地震反射异常体近东西向呈带状展布,与盆地中部航磁高ΔTa异常带相关。从地层发育及地震相特征分析,这些地震反射异常体应为辉绿岩-玄武岩等基性火成岩体,且与航磁ΔTa异常带上的磁力高相对应。异常体具有垂直向下的通道,与断裂及岩浆活动通道有关。盆地中部高航磁异常带为多期构造易活动带,反映了满加尔坳陷震旦纪与中晚奥陶世处于拉张的构造背景。  相似文献   

利用井中三分量磁测异常垂直分量及水平分量模差对旁侧异常进行二维拟合计算推断解释     

刘冬节 《物探与化探》2011,35(5):617-619

利用井中三分量磁测异常垂直分量ΔZ及合理利用水平分量模差ΔH’值对旁侧异常进行二维拟合反演计算,从而对异常进行推断解释,能有效解决井中旁侧磁性体的赋存情况。该方法用于寻找深部磁性矿体准确性高,地质效果显著。  相似文献   

莱州市土山东宋铁矿地质特征     

毕明光  孙亮亮  解英芳  马世君  赵顺红 《山东国土资源》2011,27(2)

通过近几年的地质找矿工作,莱州市土山-东宋地区发现了中型变质沉积铁矿床.矿床产于古元古代粉子山群小宋组二段底部的含铁岩系.矿石工业类型为需选弱磁性铁矿石,主要成因类型为磁铁黑云片岩型、磁铁变粒岩型.矿床范围内共划分了5个矿段40个矿体.该文以此为基础,对矿区地质特征进行分析研究,以期促进山东省铁矿地质勘查工作的开展.  相似文献   

基于找矿模型的云南个旧某深部隐伏矿体三维预测   总被引：3，自引：0，他引：3  

戎景会 《地质与勘探》2012,48(1):191-198

通过分析个旧锡铜多金属（东）矿区的成矿地质条件,结合多年勘查开采经验,建立了该研究区的找矿地质模型;并且在此模型的基础上以Surpac软件为平台利用收集到的剖面、钻孔等数据资料建立了三维可视化模型,包括地表、地层、断裂、岩体、已知矿体以及钻孔,在此基础上划分立方体单元,对研究区深部矽卡岩型矿体进行预测圈定,得到五个预测...  相似文献   

陕西省紫阳县朱溪河钛磁铁矿地质特征     

李方周 《陕西地质》2012,30(1):35-40

紫阳县朱溪河钛磁铁矿区分布着北西向碱基性岩脉群,钛磁铁矿体多产于规模大、分异好的辉绿岩体中部暗色相带内,与围岩呈渐变过渡关系,产状与含矿岩体产状基本一致。矿石自然类型为浸染状钛磁铁矿,矿石工业类型为需选弱磁钛磁铁矿石,矿床成因类型为岩浆晚期分异型。大比例尺磁法测量磁异常能较好的反映成矿信息。  相似文献   

Composition and microstructure of magma bodies from effective medium theory   总被引：1，自引：0，他引：1  

M. A. J. Taylor  S. C. Singh 《Geophysical Journal International》2002,149(1):15-21

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On the Dynamics of a Deformable Satellite in the Gravitational Field of a Spherical Rigid Body     

Oliver M. O'Reilly  Benjamin L. Thoma 《Celestial Mechanics and Dynamical Astronomy》2003,86(1):1-28

In this paper, a model is developed for the dynamics of a system of two bodies whose material points are under the influence of a central gravitational force. One of the bodies is assumed to be rigid and spherically symmetric, while the other is assumed to be deformable. To develop a tractable model for the system, the deformable body is modeled using Cohen and Muncaster's theory of a pseudo-rigid body. The resulting model of the system has several of the features, such as angular momentum conservation, exhibited by more restrictive models. We also show how the self-gravitation of the deformable body can be accommodated using appropriate constitutive equations for a force tensor. This enables our model to subsume many existing models of ellipsoidal figures of equilibrium. After the model and its conservations have been discussed, attention is restricted to steady motions of the system. Several results, which generalize recent works on rigid satellites, are established for these motions. For a specific choice of constitutive equations for the pseudo-rigid body, we determine the steady motions with the aid of a numerical continuation method. These results can also be considered as generalizations of earlier works on Roche's ellipsoids of equilibrium.  相似文献   

A Preliminary Study on Fluid Inclusions and Mineralization of Xitieshan Sedimentary-Exhalative (SEDEX) Lead-Zinc Deposit     

WANG Lijuan  ZHU Xinyou  WANG Jingbin  DENG Jiniu  WANG Yuwang  ZHU Heping 《《地质学报》英文版》2008,82(4):838-844

The Xitieshan lead-zinc deposit is located at the northern margin of the Qaidam Basin, Qinghai Province, China, and had developed a complete marine sedimentary-exhalative system. Our preliminary study of ore-forming fluids shows that fluid inclusions in quartz from altered stockwork rocks that represent the pipe facies have a wide range of temperature and salinity. The intense fluid activities are characteristics of the pipe facies of the exhalative system. Fluid inclusions in carbonates near the unstratified ore bodies hosted in the thick-bedded marble which represents vent-proximal facies are large in size and have moderate to high temperatures. They represent unerupted sub-seafloor fluid activity. Fluids in altered stockwork rocks and carbonates have similar H2O-NaCl-CO2 system, both belonging to the sedimentary-exhalative system. The fluids migrate from the pipe facies to the unstratified ore bodies. Boiling of the fluids causes the separation of CO2 vapor and liquid H2O. When the fluids migrate into the unconsolidated thick-bedded marble, the escape of CO2, decreasing temperature and pressure as well as some involvement of seawater into the fluids result in the unmixing of fluids with high and low salinity and deposition of ore-forming materials. The two unmixed fluids were trapped in unconsolidated carbonates and the ore-forming materials were deposited in the unconsolidated carbonates to form the sedimentary-exhalative type unstratified ore bodies. The ore-forming temperature of unstratified ore bodies is up to high temperature indicating that there is a huge ore-forming potential in its deep.  相似文献   

冀北康保晚古生代花岗质岩浆作用年龄数据及构造意义   总被引：1，自引：0，他引：1       下载免费PDF全文

田涛  倪志耀  潘登张虹  王阳阳 《地质科学》2018,(2):661-667

冀北康保位于华北克拉通北缘中段,北靠古亚洲洋构造域（中亚造山带）。区内出露有小西沟、前孟家地、石柱梁、三老虎、新村和西五福堂等6个晚古生代花岗岩体,它们的锆石U-Pb年龄分别为260.6±1.6 Ma、264.1±1.7 Ma、269.5±2.7 Ma、276.3±1.9 Ma、280.4±2.0 Ma和284.7± 1.7 Ma等,表明这些花岗岩体形成于早-中二叠世。晚古生代（早-中二叠世）花岗岩体在冀北康保有规律地出露,应该与古亚洲洋的构造演化有关,可能反映了古亚洲洋的俯冲消减作用具有多期次的特点。  相似文献