排序方式： 共有38条查询结果，搜索用时 15 毫秒
21.
22.
A numerical inverse method was used to interpret simultaneously multirate injection and recovery data from single-hole pneumatic tests in unsaturated fractured tuff at the Apache Leap Research Site near Superior, Arizona. Our model represents faithfully the three-dimensional geometry of boreholes at the site, and accounts directly for their storage and conductance properties by treating them as high-permeability and high-porosity cylinders of finite length and radius. It solves the airflow equations in their original nonlinear form and yields information about air permeability, air-filled porosity and dimensionless borehole storage coefficient. Some of this is difficult to accomplish with analytical type-curves. Air permeability values obtained by our inverse method agree well with those obtained by steady-state and type-curve analyses. 相似文献
23.
24.
研究缺氧的古海洋环境,对了解显生宙的地史具有重要意义。罗兹和莫尔斯(Rhoads等,1971)综合了一些现代缺氧盆地的资料,并根据沉积组构和大型动物群特征,建立了一个与氧有关的生物相模式。此后,这个模式的若干变化形式在古环境重建中获得了成功的应用。然而这些应用一般只能描述岩层中三种与氧有关的相。一般说来,缺氧相是通过不全大型底栖生物的纹层状地层来鉴别的,而充氧环境则表现为丰富多样的大化石和很强的生物扰 相似文献
25.
26.
It is proposed that a rearrangement of single-particle degrees of freedom may occur in a portion of the quantum-fluid interior of a neutron star. Such a rearrangement is associated with the pronounced softening of the spin-isospin collective mode which, under increasing density, leads to pion condensation. Arguments and estimates based on fundamental relations of many-body theory show that one realization of this phenomenon could produce very rapid cooling of the star via a direct nucleon Urca process displaying a T5 dependence on temperature. 相似文献
27.
把孔隙度与热成熟度联系起来,是近年来出现的油气储集岩性能研究的一条新思路。利用热成熟度的幂函数来表达储集岩孔隙度在埋藏成岩过程中的缩减,为区域性孔隙度的钻前预测及过去地质时期孔隙度的估算,为储集岩层序中异常孔隙度带的识别,为不同地质背景孔隙度数据的对比,提供了一种合理可行的经验方法。 相似文献
28.
30.
朱起煌 《沉积与特提斯地质》1989,9(6):45-56
引言目前普遍认为,不同时代地层中广为分布的碳酸盐岩基本上都是在浅海中形成的。研究浅海碳酸盐的沉积环境,无论在学术上还是在油气勘探中都具有十分重要的意义。综合近二十年的研究成果,可以认为浅海碳酸盐有三类基本沉积环境,即台地(Platform)、陆架(shelf)和坡地(ramp)。据 Tucker(1985)定义,所谓碳酸盐台地,实际上是一种为浅海(陆表海)所淹没的相当平坦的克拉通区,水深在5—10m 之间,宽度很大(10~2—10~4km),其向洋侧可以有或缓或陡的斜 相似文献