| “多层叠置独立含煤层气系统”形成的沉积控制因素 |
| |
| 引用本文： | 沈玉林,秦勇,郭英海,易同生,邵玉宝,金洪波.“多层叠置独立含煤层气系统”形成的沉积控制因素[J].地球科学,2012,37(3):573-579. |
| |
| 作者姓名： | 沈玉林 秦勇 郭英海 易同生 邵玉宝 金洪波 |
| |
| 作者单位： | 1.中国矿业大学资源学院, 江苏徐州 221116 |
| |
| 基金项目： | 国家自然科学基金青年基金项目41102100国家自然科学基金重点项目40730422中央高校基本科研业务费专项资金课题2010QNA52 |
| |
| 摘 要： | 基于黔西地区晚二叠世含煤地层的实测资料, 初步探讨了"多层叠置独立含煤层气系统"形成的沉积控制因素.研究表明, 含煤地层的沉积条件奠定了"多层叠置独立含煤层气系统"的物质及物性基础, 层序地层格架特点限定了含气单元间含气性的连通性.最大海泛面附近的菱铁质泥岩等低渗透岩层控制了垂向次级含气单元间的含气性相对独立, 且煤层含气量与海平面升降之间存在一定的相关性, 即最大海侵面附近煤层含气量相对较低, 此界面似乎可作为含煤层气系统内独立含气单元的成藏边界; 层序界面沟通了含气单元间的含气联系, 使得靠近层序界面附近的煤层具有相似的含气性特征.
|
| 关 键 词： | 煤层气 层序地层 低渗透岩层 最大海侵面 含气系统 |
| 收稿时间： | 2011-10-20 |
Sedimentary Controlling Factor of Unattached Multiple Superimposed Coalbed-Methane System Formation |
| |
| Abstract: | Based on the measured data of Late Permian coal-bearing strata in western Guizhou Province, the sedimentary controlling factor of "unattached multiple superimposed coalbed-methane system" formation is preliminarily discussed in this paper. It shows that the depositional conditions of coal-bearing strata have laid the material physical properties foundation for "unattached multiple superimposed coalbed-methane system". The characteristics of sequence stratigraphic framework limit gas connectivity between gas units. The siderite mudstone with low-permeability, which is distributed near the maximum flooding surface, makes the vertical sub-strata of gas between the gas-bearing units relatively independent. There is correlation between coalbed methane contents and the sea level. Coalbed methane contents near to the maximum flooding surface are relatively low. The interface can be regarded as a stand-alone boundary for gas-forming units in the coalbed-methane system. The sequence boundary connects the gas units, making the coal seams near to sequence boundary with the similar gas bearing characteristics. |
| |
| Keywords: | |
|
| 点击此处可从《地球科学》浏览原始摘要信息 |
|
点击此处可从《地球科学》下载全文 |
|
