调谐效应影响下的AVO属性在构造煤预测中的应用  

Application of tectonic coal prediction by AVO attributes under tuning effect

作　　者：师素珍[1] 郭家成 谷剑英 刘中元 李玉莹 付荟颖 SHI Suzhen;GUO Jiacheng;GU Jianying;LIU Zhongyuan;LI Yuying;FU Huiying(State Key Laboratory of Coal Resources and Mine Safety,China University of Mining ＆ Technology,Beijing 100083,China)

机构地区：[1]中国矿业大学(北京)煤炭资源与安全开采国家重点实验室,北京100083

出　　处：《煤田地质与勘探》2018年第3期133-138,共6页Coal Geology & Exploration

基　　金：国家自然科学基金青年科学基金项目(41702173)~~

摘　　要：针对构造煤分布范围预测难度大问题,分析了调谐效应影响下不同煤体结构的AVO属性特征,并利用该方法进行了鄂尔多斯盆地东缘某区块构造煤分布范围的预测。首先取典型的模型数据对原生煤、构造煤-I和构造煤-II进行了AVO曲线和属性分析,发现煤层顶板比底板更适合做AVO属性的分析,且随着煤体破坏程度的增加,截距的绝对值增大,梯度的绝对值也增大;分别取5 m、7 m、10 m、12 m和15 m厚的煤层模型进行正演,发现煤层厚度变化时,虽然受到了调谐效应的影响,但仍然以煤体结构变化影响为主,并且AVO属性变化规律和无调谐效应影响时规律一致,即构造煤比原生煤截距绝对值更高、梯度绝对值更高,因而AVO属性能够用来进行构造煤的预测。将该技术应用于鄂尔多斯盆地东缘某工区8号煤层的构造煤分布区预测中,预测结果与井孔揭露结果一致。理论与实践证明,利用AVO属性进行构造煤分布区预测是可行的。AVO attributes of different coal body structure under the influence of tuning effect was analyzed and distribution of tectonic coal in Ordos region was predicted in this paper. The AVO curve for the roof and floor of the 3 models（primary coal, tectonic coal-1 and tectonic coal-2） were firstly analyzed. Because the wide-angle reflection of coal floor happened earlier, the roof of the coal is more suitable for the AVO analysis. AVO attribute analysis for the roof and floor of the three kinds shows that with the increase of the damage degree, the absolute value of intercept and gradient will be higher. Taking 5 m, 7 m, 10 m, 12 m and 15 m coal seam models to forward, it was found that although the AVO attributes were still influenced by coal body structure, tuning effect exists. The AVO attribute change rule was also consistent with the situation without tuning effect, namely tectonic coal has higher intercept and gradient absolute value, so it can be used to predict the distribution of the tectonic coal. Applying the theory to the detection of tectonic coal for seam 8 in the east margin of Ordos region, the prediction results match with the situation revealed by wells. Therefore, according to theory and practice it proved that the detection of tectonic coal by AVO attributes is feasible.

关 键 词：AVO属性 构造煤 原生煤 调谐效应 

分 类 号：P631.4[天文地球—地质矿产勘探]