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Study on the AVO forward modeling of coal bearing strata

机译：含煤地层AVO正演模拟研究

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摘要

Based on the AVO theoretical modeling of the coalbed, this paper analyzes the AVO characteristics and influencing factors of the coalbed P-P reflection wave. On the top interface of the coalbed, the P-P reflection wave absolute value of reflective coefficient decreases when the incidence angle increases between 0 and 60 degrees, and then increases gradually. On the bottom interface of the coalbed, the total reflection occurs rather strikingly because the incident wave propagates from low impendence media to high one. And for the soft and fractured coal in particular, such a phenomenon takes place even at an incidence angle less than 15 degrees. So the reflection characteristics of the coalbed bottom interface are not conducive to AVO analysis. AVO response is closely relative to the coal structure, and AVO intercept and gradient of top interface of the coalbed reflection wave increases when the coal structure is destroyed severely. For coalbeds of the same coal structure, AVO intercept and gradient of the coalbed top interface with the sandstone roof is greater than that with the mudstone one. The tuning of coal-bed thickness has adverse influence on coalbed AVO attributes analysis obviously. Those AVO characteristics of coalbed are shown further by modeling from Well 9-10-15 and Well 10-E-3 in Huainan coalfield, China.
机译：基于煤层AVO理论模型，分析了煤层P-P反射波的AVO特征及其影响因素。在煤层的顶部界面上，当入射角在0至60度之间增加时，反射系数的P-P反射波绝对值减小，然后逐渐增大。在煤层的底部界面，由于入射波从低阻抗介质传播到高阻抗介质，因此发生了全反射。并且特别是对于软煤和压裂煤，即使在入射角小于15度时也会发生这种现象。因此，煤层底部界面的反射特征不利于AVO分析。 AVO响应与煤层结构密切相关，当严重破坏煤层结构时，AVO截距和煤层反射波顶部界面的梯度会增大。对于相同煤构造的煤层，煤层顶界面与砂岩顶板的AVO截距和梯度大于泥岩顶板。煤层厚度的调整对煤层AVO属性分析有明显的不利影响。通过对中国淮南煤田的9-10-15井和10-E-3井进行模拟，进一步显示了煤层的AVO特征。

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