Dynamic analysis of a cylindrical casing–cement structure in a poroelastic stratum

The transient response of a cylindrical casing–cement structure in a poroelastic stratum under dynamic radial tractions is one of the significant issues during the analysis of downhole operations and the selection of safe material. Based on the Biot theory and general elastic mechanics, this paper gives a set of exact solutions for radial displacement, stresses for the casing–cement system and the pore pressure of the infinite surrounding poroelastic stratum in the Laplace transform space. Solutions are presented for three different types of transient radial loadings acting on the surface of casing, i.e., suddenly applied constant load, gradually applied step load and triangular pulse load. Time domain solutions are obtained using a reliable numerical method of inverse Laplace transforms. A detailed parametric study about the transient response is presented both at the casing–cement interface and the cement–stratum interface, and the distributions of the pore pressure and the effective stresses in the stratum are also examined. Copyright © 2017 John Wiley & Sons, Ltd.     

鲁北新生代隐伏火山岩及其石油地质意义

鲁北新生代隐伏火山岩可划分为3个喷发期6个亚期,9种火山岩岩石类型和同期侵入的辉绿岩。它们形成在近大陆边缘的板内裂谷型盆地,对于富有机质生油岩的沉积、各种储集体的形成、多种含油圈闭类型的形成以及有机质成熟向烃类转化都是非常有利的。作为储集岩主要有玄武安山岩、辉绿岩和湖底玄武质凝灰岩。储油空间主要为次生孔隙和裂缝。火山岩及其有关岩石在本区不仅形成了特殊的油气藏,而且还可作为盖层、封堵层、披复构造的基岩,因此对石油地质勘探有重要意义。     

一种新型峰林——武陵源石英砂岩峰林

本文探讨位于湘西武陵山脉中段的一种新的峰林地貌类型－－石英砂岩峰林的形态特征，形成过程与形成机理，认为石英砂岩峰林是由水平状石英砂岩受垂直与交叉节理的分割之后，在无溶蚀作用下形成的。     

Slope process change and colluvium deposition in Swaziland: An SEM analysis

Electron microscope analysis of sixty samples taken from six colluvium sites in Swaziland has shown that the quartz grains exhibit marked edge abrasion in the uppermost beds of exposures. This edge abrasion is lacking in the lower beds in all sections examined and indicates slope process change during colluvium deposition. A model of slope evolution is provided, in which slope erosion progressively brings about more channelling and causes greater surface roughness because of the exhumation of more core stones and differentially weathered rock. This roughness causes increased edge abrasion.     

Structural evolution of the contact between two Penninic nappes (Zermatt-Saas zone and Combin zone,Western Alps) and implications for the exhumation mechanism and palaeogeography

The boundary zone between two Penninic nappes, the eclogite-facies to ultrahigh-pressure Zermatt-Saas zone in the footwall and the blueschist-facies Combin zone in the hanging wall, has been interpreted previously as a major normal fault reflecting synorogenic crustal extension. Quartz textures of mylonites from this fault were measured using neutron diffraction. Together with structural field observations, the data allow a refined reconstruction of the kinematic evolution of the Pennine nappes. The main results are: (1) the contact is not a normal fault but a major thrust towards northwest which was only later overprinted by southeast-directed normal faulting; (2) exhumation of the footwall rocks did not occur during crustal extension but during crustal shortening; (3) the Sesia-Dent Blanche nappe system originated from a continental fragment (Cervinia) in the Alpine Tethys ocean, and the Combin zone ophiolites from the ocean basin southeast of Cervinia; (4) out-of-sequence thrusting played a major role in the tectonic evolution of the Penninic nappes. An erratum to this article can be found at     

××地块水泥土室内配合比试验

针对目前国内外水泥土强度测定的试验方法,还未形成规范操作的情况下,该文主要从室内试验的角度,阐述了水 泥土试验的目的、试验设备、试样的制备以及试验的方法,从而确定出最佳的水泥掺入比,同时对水泥土与原状土的 物理力学性质以及水泥土的强度增长机理作初步的探讨。     

辽宁阜新排山楼金矿的40Ar/39Ar成矿年龄

排山楼大型金矿床产于辽西高级变质太古宙花岗岩-绿岩带中,受绿岩中、上部层位的基性-中酸性火山岩系和东西向韧性剪切带控制。容矿岩石主要是变质安山质-英安质火山岩类。为解决主矿体的形成时代,选取含金石英细脉浸染状矿石中的石英测定了⁴⁰Ar/³⁹Ar年龄为2105.2±10.4Ma。谱线特征为马鞍型,其底坪年龄为石英的结晶年龄。由此提出排山楼金矿的成因主要与吕梁期的东西向韧性剪切带有关。     

航放异常解释用Z量板的水泥模型验证

对航放异常矩形反演使用的理论Z量板进行了水泥板模型验证，解决了在航放实测条件下难以验证以及如何消除验证模型对γ射线的等效空气吸收系数与空气本身对γ射线的吸收系数不同的影响等问题。验证结果表明，该量板是正确的，可用的。     

硫铝酸盐水泥浆性能调节方案

讨论了水灰比、抖浆水温和有机处理剂对硫铝酸盐水泥浆性能的影响，提出了该水泥浆性能的调节方法。     

载金石英的阳离子效应及其对含矿性的指示意义

石英的阳离子效应指石英结构中Al~(3+)与Si~(4+)的置换作用.在分析海南戈枕断裂金成矿带石英中普遍存在的这一作用,以及由此造成的石英粉末红外谱(IR)、顺磁共振谱(EPR)及热释光曲线(TL)特征,进而讨论了这些特征与金成矿的关系.