地层的

This series of bit is suitable for drilling medium hard to hard formations with high compressive strength and medium abrasiveness.

适合在中硬至硬的高抗压强、中等研磨性的地层中使用。

And can improve signal-to-noise ratio and resolution of reflecting signal from stratum sections.

提高了地层剖面反射信号的信噪比和分辨率。

At present, the research of sequence stratigraphy features also becomes the hotspot and front field of sedimentology and related subjects research.

目前，层序地层研究也已经成为沉积学及相关学科研究的热点和前沿。

Nuclear Magnetic Resonance Logging has been widely used in determining porosity of formation.

核磁共振测井是确定地层孔隙度的有效方法，已经得到广泛应用。

The lithologies of the igneous rock layer are automatically discriminated under the maximum membership.

利用最大隶属原则，编程实现了火成岩地层岩性的自动识别。

Topics discussed within the field guide include: stratigraphy; faults; mineralisation; fossils and environmental interpretations.

主要的讨论题目有：地层、断层、成矿作用、化石和环境解释。

Jet orifice had been added for air entry,only little air was got into the hole bottom,the most of air entered into internal pipe through the jet orifice ,then was carried out from the hole bottom.

针对贯通式潜孔锤在复杂地层钻进中遇到的问题，对反循环钻头进行了改进：在钻头上部增加喷射孔，使气流只有一少部分进入孔底，大部分经喷射孔直接进入内管，排至地面。

The distribution of abnormal high pressure is relative to Eogene gypsolith and salt layers.

库车坳陷异常高压呈东西向带状分布，中部克拉苏-东秋-迪那构造带的地层压力系数在2.0以上，往南北两侧递减。

He noted that a possible fossil had been discovered in Precambrian rocks in Canada.

他注释道，加拿大在前寒武纪地层中发现了一块可能是化石的沉积物。

The study of organic origin and its early evolution must be based on fossils in Precambrian strata.

而生命起源及其早期演化则必须依赖前寒武纪地层中的生命化石记录进行研究。

As she looked at Warrington's manly face, and dark, melancholy eyes, she had settled in her mind that he must have been the victim of an unhappy attachment.

每逢看到沃林顿那刚毅的脸，那乌黑、忧郁的眼睛，她便会相信，他一定作过不幸的爱情的受害者。

Maybe they'll disappear into a pothole.

也许他们将在壶穴里消失