Proposed GSSP for the base of Cambrian Stage 9, coinciding with the first appearance of Agnostotes orientalis, at Duibian, Zhejiang, China     

Loren E. BABCOCK  Gabriella BAGNOLI 《中国科学D辑(英文版)》2009,(4)

Exposed in natural outcrops near the Duibian Village, Jiangshan County, Zhejiang Province, China, the Duibian B section is proposed as the boundary stratotype for the base of an unnamed stage termed provisionally Cambrian Stage 9. The proposed position of the GSSP is 108.12 m above the base of the Huayansi Formation, at a horizon coinciding with the first appearance of the cosmopolitan agnostoid trilobite Agnostotes orientalis. This horizon coincides also with the first appearance of the cosmopoli-tan polym...  相似文献   

Desorption-diffusion model and lost gas quantity estimation of coalbed methane from coal core under drilling fluid medium   总被引：1，自引：0，他引：1  

Geoff WANG 《中国科学:地球科学(英文版)》2010,(4)

The differences of coalbed methane(CBM) desorption-diffusion from coal drilling-core under various drilling fluid medium are not considered in the present calculating methods of lost CBM quantity,which leads possibly to the inaccuracy of CBM quantity in coal seam.Here we took the desorption of CBM from coal core under drilling fluid medium as a pressure-swing process,and based on the Langmuir equation and Fick-first law,established the desorption-diffusion model and numerical modeling method of lost gas(inc...  相似文献   

建立郑州市多用途地籍数据库的思考     

路婕  吴克宁  冯新伟  吕巧灵 《国土资源信息化》2005,(3):2-4,14

本文对郑州市土地利用管理多用途地籍数据库进行了可行性分析,提出建立该数据库的总体设计思路,讨论了建库过程中可能遇到的问题及解决方法。  相似文献   

伊通复杂断陷盆地地震采集技术     

卢殿龙  罗春波  袁良信  黄翠叶  邵冬梅 《吉林大学学报(地球科学版)》2010,(Z1)

从伊通盆地复杂的表层结构及深层地质条件出发,分析了影响复杂构造区信噪比和分辨率的主要因素,从而有针对性地研究了复杂构造下的观测系统设计及照明分析技术、复杂地表结构条件下的表层调查技术、提高信噪比的组合检波压制干扰波技术和基于表层调查的激发技术。通过一系列技术研究,形成了三分、三优选的技术措施,有效地提高了伊通盆地复杂构造的信噪比和分辨率,提高了西北缘山地的成像质量,满足了油气勘探的需求。  相似文献