波阻抗反演在东胜煤田勘探中的应用  

Application of Elastic Impedance Inversion in Dongsheng Coalfield Prospecting

作　　者：曹振国[1] 

机构地区：[1]山西省地球物理化学勘查院,山西运城044000

出　　处：《中国煤炭地质》2010年第2期54-58,共5页Coal Geology of China

摘　　要：东胜煤田为陆相沉积煤田,具有含煤层数多、厚度不均、层间距不稳定等特点,勘探区内地震反射波追踪对比存在多解性,严重影响了煤层的追踪对比。为破解该难题,对东胜煤田地震勘探资料进行了以模型为基础的多井约束岩性宽带反演,即:利用该勘探区的地震数据资料、对煤层反射波解释层位、断层数据,结合测井数据、岩性柱状数据及其它地质资料,进行多井约束下的二维叠后反演,对所得到的反演数据体再依据反演原理,结合已知测井数据进行地震属性反演,最终得到能够反映岩性变化的波阻抗数据。对波阻抗反演数据进行煤层追踪对比解释,准确圈定出区内煤层的赋存范围,并合理解释了煤层分叉、合并、尖灭及厚度变化等地质现象,取得了较为可靠的地质成果。The Dongsheng coalfield is a limnic coalfield with characteristics of multiple coal seams, uneven coal thickness, and uncertain coal seam intervals. Seismic reflection wave tracing and correlation in the prospecting area existed interpretation ambiguity, and seriously impacted coal seams tracing and correlation. To decipher this difficult problem, seismic data multihole constrained lithologic wideband inversion based on models were carried out, i.e.： by the use of seismic data, coal seam reflection interpreted horizon, fault data, logging data, lithologic column data, combined with geological data carry out muhihole constrained 2D poststack inversion, to use the inversed data volume combined with known logging data carry out seismic attribute inversion based on inversion principle, finally gained elastic impedance data can reflect lithologic changes. To use elastic impedance inversion data carry out coal seams tracing and correlation interpretation, correctly circled out coal seams hosting extent in the area, and reasonably interpreted geologic phenomena of coal seam splitting, merging, pinch-out and thickness changing, and gained rather reliable geological results.

关 键 词：地震勘探 多井约束 地震属性 波阻抗反演 东胜煤田 

分 类 号：P631.4[天文地球—地质矿产勘探]