碳酸盐岩

PDC bit technology is fine-tuned for specific formations located in fields traditionally dominated by roller cone bit applications.

简介：最近，史密斯钻头公司推出一种PDC钻头技术，它专门用来钻坚硬的碳酸盐岩和耐磨的砂岩地层。

The paleochemical characteristics of paleoseawater from the Early Ordovician of Yangtze Craton are reconstructed through contrastive research of REE and trace element composition, Ce anomalies and Sm/Nd ratio of conodonts.

利用激光剥蚀电感耦合等离子质谱对扬子克拉通宜昌三峡地区早奥陶世不同时期海相碳酸盐岩地层中的牙形石个体进行了原位分析，并与已发表的世界其他地区古海水的稀土元素组成进行了比较，利用REE和微量元素组成、δCe和Sm/Nd比值等地球化学指标恢复了该时期古海水的地球化学性质。

There have been subsequent changes in the composition stromatolite biota through Earth's history. Smaller eubacteria may have greater involvement than cyanobacteria in stromatolite formation in the Precambrian, and cyanobacteria may enter stromatolite building biota until the latest Neoproterozoic.

参与碳酸盐岩叠层石建造的微生物群组成可能随着地质历史的演化发生变化，蓝细菌在显生宙的叠层石建造过程中起主导作用，细胞体积更小的真细菌很可能是参与前寒武纪叠层石建造的主要微生物。

Using this method, we determine the location of main fault distribution in a carbonate rock area in South China.

利用这种方法，计算了南方某碳酸盐岩地区的基底磁异常梯度模，识别出了该区的主要断裂分布。

The outgas types and amount of different gas resource varied with the different geological conditions and evolution processes. There are four outgas models including the model in which inorganic gas directly overflows from mantle matter through lithospheric fracture,the model of heat flow piercement outgas,the model of volcano-magma outgas,and the model of carbonate rock outgas due to heat metamorphism.

对气藏成藏条件和深部壳幔结构的研究表明，松辽盆地存在多种类型无机&气源&，由于赋存的地质条件和演化过程不同，不同气源脱气的方式、脱出气体的类型、脱气量也大不相同，共有4种主要的模式：地幔物质沿超岩石圈断裂直接脱气模式；热流底辟体脱气模式；火山—岩浆成因模式；碳酸盐岩热变质成因模式。

Two carriers are likely to be used in paleotemperature reconstruction: carbonate and iron oxides.

在白垩系陆相红层古温度恢复过程中可能普遍使用两种载体：碳酸盐岩及三价铁氧化物。

Research conclusions:The karsts encountered in the construction can be divided into four types according to the engineering geological charac.

研究目的：宜万线是目前已建和在建工程中岩溶最为发育的铁路线，全线共有隧道159座，约占线路总长度的59%，其中多数隧道穿越碳酸盐岩地层，岩溶、岩溶水极其发育，这给隧道工程的安全施工以及工程建成后的运营安全造成十分重要的影响。

Study on the geologic forecast s way tunnel of in karsts -geology;2. Study of the Characteristic of Bearing Capability of Pile Foundation in Karsts Area;3. Research conclusions:The karsts encountered in the construction can be divided into four types according to the engineering geological charac.

研究目的：宜万线是目前已建和在建工程中岩溶最为发育的铁路线，全线共有隧道159座，约占线路总长度的59%，其中多数隧道穿越碳酸盐岩地层，岩溶、岩溶水极其发育，这给隧道工程的安全施工以及工程建成后的运营安全造成十分重要的影响。

The results show that the organic matter in the dark limestones of the lower Cretaceous is of medium abundance, good type and proper maturity. The limestones have hydrocarbon-generating potential.

研究结果表明，该盆地下白垩统暗色碳酸盐岩的有机质丰度中等、类型较好、成熟度适中，具备了形成油气的条件。

The carbonate reservoir is characterized by the fact that the azimuth of fractures is related with structural axis, the developmental extent of fractures and structural location are close related to dip of structure, low-dipping structural axis has not growth fractures. Otherwise, growth fractures, density of fractures are related thickness of layer, more thickness, then less density of fractures. Intra-fracture of layer is main. Some marlstone and anhydrite barriers exist in the reservoir, and become some non-connected oil-water system.

结果表明：碳酸盐岩油藏为裂缝的发育程度与构造位置及构造倾角的大小有关，构造轴部倾角小裂缝不发育，构造翼部倾角大，裂缝发育；裂缝发育密度随着单层厚度增加而逐渐减小；裂缝以层内缝为主，穿层大裂缝少；油藏中存在若干泥质灰岩和膏盐的隔夹层，形成多个连通不畅的油水分布系统。

For a big chunk of credit-card losses; the number of filings (and thus charge-off rates) would be rising again, whether

年美国个人破产法的一个改动使得破产登记急速下降，而后引起了信用卡大规模的亏损。

Eph. 4:23 And that you be renewed in the spirit of your mind

弗四23 而在你们心思的灵里得以更新