| 薄互层条件下围岩变化对煤层反射波的影响研究 |
| |
| 引用本文： | 常锁亮,张生,刘晶,刘最亮,陈强,刘波.薄互层条件下围岩变化对煤层反射波的影响研究[J].煤田地质与勘探,2021,49(5):220-229. |
| |
| 作者姓名： | 常锁亮 张生 刘晶 刘最亮 陈强 刘波 |
| |
| 基金项目： | 阳泉煤业(集团)有限责任公司研究开发项目GY18027山西省面上青年基金项目201901D211005 |
| |
| 摘 要： | 为研究薄互层条件下围岩变化对煤层反射波的影响，以地震勘探中λ/4薄层范围内含煤地层为研究对象，建立围岩岩性、厚度与结构变化三类模型，基于薄层反射系数谱理论中Brekhovskikh方程，计算并总结围岩变化对煤层AVO曲线、属性及道集的影响。研究结果表明:λ/4范围内围岩岩性变化会对煤层AVO响应产生显著影响，其中顶板为砂岩会使得煤层AVO截距和梯度属性明显增大，顶板为泥岩会使得煤层AVO截距和梯度属性增大，且顶板岩性不同，对应的煤层AVO道集特征也会发生变化；λ/4范围内围岩互层结构和厚度变化会对煤层AVO响应产生一定影响，但是影响较小，其中围岩互层结构的变化会使得煤层AVO道集特征产生变化，围岩厚度的变化会使得煤层AVO截距属性产生变化；基于界面型的Zoeppritz方程不适用于薄互层含煤地层的正演模拟，应选取更适用于薄互层的Brekhovskikh正演方程或者其他模拟方法。
|
| 关 键 词： | 薄互层 围岩变化 反射系数谱 煤层反射波 |
| 收稿时间： | 2020-10-19 |
Influence of surrounding rock changes on the coal seam reflected wave under thin interbed condition |
| |
| Abstract: | In order to study the influence of the changes of surrounding rock on the reflected wave of coal seam under the condition of thin interbeds, the coal-bearing strata in the λ/4 thin layer range in seismic exploration is taken as the research object, and three types of models of surrounding rock lithology, thickness and structure change are established. By Brekhovskikh equation in the theory of thin-bed reflection coefficient spectrum, the influence of surrounding rock changes on the AVO curve, attributes and gathers of coal seams are calculated and summarized. The research results show that the changes of surrounding rock lithology in the range of λ/4 have a significant impact on the AVO response of the coal seam. The sandstone roof will significantly increase the AVO intercept and gradient properties of the coal seam. The mudstone roof makes the AVO intercept and gradient properties of the coal seam increase; because of the different roof lithology, the corresponding coal seam AVO gather characteristics will also change. The surrounding rock interbed structure and thickness changes in the range of λ/4 will have a certain impact on the coal seam AVO response, but the impact is small. Among them, the changes of the surrounding rock interbed structure will cause changes in the AVO gather characteristics of the coal seam, and the surrounding rock thickness will cause changes in the AVO intercept attribute of the coal seam. The Zoeppritz equation based on the interface type is not suitable for the normalization of the thin interbedded coal-bearing strata. For simulation, the Brekhovskikh forward equation or other simulation methods that are more suitable for thin interlayers should be selected. |
| |
| Keywords: | |
| 本文献已被 CNKI 等数据库收录！ |
| 点击此处可从《煤田地质与勘探》浏览原始摘要信息 |
| 点击此处可从《煤田地质与勘探》下载免费的PDF全文 |
|
