三维地震波形差异属性分析在预测岩溶裂隙发育带中应用

摘要

基于岩层反射波各向异性,提出利用三维地震波形差异属性特征预测岩溶裂隙发育带的思路.以断裂构造极为发育的桃园矿南三采区为例,对该采区太原组灰岩顶界面以下30m范围内的岩溶裂隙发育带进行了分析.通过典型剖面波形差异性分析发现,在太原组灰岩岩溶裂隙发育带,其波形差异属性均大于0.16;而沉积环境稳定、岩层保持完整、各向同性的灰岩内,其波形差异属性接近于0.南三采区波形差异属性异常平面图表明,在太灰顶界面下30m内存在3个岩溶裂隙发育带,分别位于采区的西南部和北部.经140个注浆钻孔验证,在岩溶裂隙发育区,62个钻孔与解释吻合,准确率达88.6%;在岩石完整性较好、岩溶裂隙不发育区,有53个探孔与解释吻合,准确率达75.5%.%Considering anisotropy of strata reflection wave,an idea of using 3D seismic waveform differential attribute features to predict karst fissure developed zone put forward.Taking the faulted structure extremely developed S3 winning district of the Taoyuan coalmine as an example,carried out karst fissure developed zone analysis for the range under the Taiyuan Formation limestone roof interface with-in 30m.Through typical section waveform differentiation analysis has found that within Taiyuan Formation limestone karst fissure devel-oped zone,all the waveform differential attributes >0.16;while in sedimentary environment stable, strata keep integrated, isotropic limestone,the waveform differential attributes near 0.The waveform differential attribute anomaly plan of S3 winning district has shown that under Taiyuan Formation limestone roof interface within 30m exists 3 karst fissure developed zones, located in southwestern part and northern part of the winning district respectively.After 140 grouting boreholes verification,in karst fissure developed zones, data from 62 boreholes are tally with interpretation, with accuracy rate 88.6%; in rock integrated, karst fissure undeveloped zones, data from 53 boreholes are tally with interpretation with accuracy rate 75.5%.