Model-driven energy attenuation method for coal seam strong reflection

Authors

ZHANG Xianxu, Xi'an Research Institute Co. Ltd., China Coal Technology and Engineering Group Corp., Xi'an 710079, China

Abstract

The reflection of coal seam in seismic data has the characteristics of strong energy, which makes the reflection of adjacent strata often concealed by the reflection of coal seam. This makes it difficult to image the adjacent weak layer and lithological interpretation difficult. Aiming at this problem, a model-driven energy attenuation method for coal seam strong reflection was proposed. This method uses the coal thickness calculated by logging and measured by borehole in underground coal mine to construct cross plot with reflection amplitude of coal seam, and fit the relationship formula between amplitude and thickness. The digital model was constructed and the reflection of coal seam was simulated. The thickness of coal seam in the whole area was calculated iteratively by using the threshold value of amplitude residual. The strong amplitude of coal seam in the actual data was attenuated by using the data simulated by the model. The experimental results of the model data shows that the method is feasible in theory; The suppression effect of the strong reflection of coal seam 3^-1 in the seismic data of a coal mine in Ordos shows that the practical application effect was good, and the imaging quality of weak reflection layer near the coal seam was improved, which provides the basic data for the lithological interpretation.

Keywords

model-driven, strong energy attenuation, coal thickness prediction, coherence stack, underground borehole data

DOI

10.3969/j.issn.1001-1986.2020.03.027

Recommended Citation

Z. (2020) "Model-driven energy attenuation method for coal seam strong reflection," Coal Geology & Exploration: Vol. 48: Iss. 3, Article 28.
DOI: 10.3969/j.issn.1001-1986.2020.03.027
Available at: https://cge.researchcommons.org/journal/vol48/iss3/28

Reference

[1] 顾雯,章雄,徐敏,等. 强屏蔽下薄储层高精度预测研究[J]. 石油物探,2017,56(3):439-448. GU Wen,ZHANG Xiong,XU Min,et al. High precision prediction of thin reservoir under strong shielding effect and its application:a case study from Sanzhao depression,Songliao basin[J]. Geophysical Prospecting for Petroleum,2017,56(3):439-448.

[2] 王大兴,王永刚,赵玉华,等. 一种地震强反射振幅消除方法在鄂尔多斯盆地的试验[C]//中国石油学会石油物探专业委员会/国际勘探地球物理学家学会. SPG/SEG 2016北京国际地球物理会议. 北京:中国石油学会石油物探专业委员会学术委员会,2016:405-408. WANG Daxing,WANG Yonggang,ZHAO Yuhua,et al. A strong seismic reflection amplitude suppressing method applied in the Ordos basin[C]//Society of Petroleum Geophysicists/Society of Exploration Geophysicists. SPG/SEG 2016 Beijing International Geophysical Conference. Beijing:Academic Committee of Society of Petroleum Geophysicists,2016:405-408.

[3] 张宪旭,杨光明,蔡文芮,等. 煤层下部地层地震成像研究[J]. 煤田地质与勘探,2015,43(2):83-85. ZHANG Xianxu,YANG Guangming,CAI Wenrui,et al. Research on seismic imaging of the lower part of coal seam research[J]. Coal Geology & Exploration,2015,43(2):83-85.

[4] 徐浩,贾晓静,张云峰. 地震多属性分析在混积环境砂体识别中的应用:以桑塔木南地区石炭系Ⅳ砂组油为例[J]. 煤田地质与勘探,2018,46(6):163-168. XU Hao,JIA Xiaojing,ZHANG Yunfeng. Application of seismic multi-attribute analysis in sand body identification of mixed sedimentation environment:A case study of Carboniferous sand group IV in the south of Sangtamu area[J]. Coal Geology & Exploration,2018,46(6):163-168.

[5] 高远,张清华,陈昌武,等. 强反射层屏蔽下薄煤层三维地震勘探应用研究[J]. 山东科技大学学报(自然科学版),2002,21(1):54-58. GAO Yuan,ZHANG Qinghua,CHEN Changwu,et al. Applied research on 3D seismic exploration in a thin coal seam under the shield of strong reflection layer[J]. Journal of Shandong University of Science and Technology(Natural Science),2002,21(1):54-58.

[6] 郑士田. 两淮煤田煤层底板灰岩水害区域超前探查治理技术[J]. 煤田地质与勘探,2018,46(4):142-146. ZHENG Shitian. Advanced exploration and control technology of limestone water hazard in coal seam floor in Huainan and Huaibei coalfields[J]. Coal Geology & Exploration,2018,46(4):142-146.

[7] 张军华,刘振,刘炳杨,等. 强屏蔽层下弱反射储层特征分析及识别方法[J]. 特种油气藏,2012,19(1):23-26. ZHANG Junhua,LIU Zhen,LIU Bingyang,et al. Analysis and identification of reservoir characteristics of weak reflectors under strong shielding layer[J]. Special Oil and Gas Reservoirs,2012,19(1):23-26.

[8] 邹锋,薛雅娟. 基于同步挤压小波变换的煤层强振幅抑制[J]. 地球物理学进展,2018,33(3):1198-1204. ZOU Feng,XUE Yajuan. Strong amplitude suppression of coal seam based on synchrosqueezed wavelet transform[J]. Progress in Geophysics,2018,33(3):1198-1204.

[9] 金成志,秦月霜. 利用长、短旋回波形分析法去除地震强屏蔽[J]. 石油地球物理勘探,2017,52(5):1042-1048. JIN Chengzhi,QIN Yueshuang. Seismic strong shield removal based on the long and short cycle analysis[J]. Oil Geophysical Prospecting,2017,52(5):1042-1048.

[10] 李海山,杨午阳,田军,等. 匹配追踪煤层强反射分离方法[J]. 石油地球物理勘探,2014,49(5):866-870. LI Haishang,YANG Wuyang,TIAN Jun,et al. Coal seam strong reflection separation with matching pursuit[J]. Oil Geophysical Prospecting,2014,49(5):866-870.

[11] 何峰,翁斌,韩刚,等. 一种基于地震约束的井控匹配追踪煤层强反射消除技术[J]. 中国海上油气,2019,31(1):61-66. HE Feng,WENG Bin,HAN Gang,et al. A seismic constraint-based technology for elimination of strong coal seam reflection via well-control and matching pursuit[J]. China Offshore Oil and Gas,2019,31(1):61-66.

[12] 许璐,吴笑荷,张明振,等. 基于局部频率约束的动态匹配追踪强反射识别与分离方法[J]. 石油地球物理勘探,2019,54(3):587-593. XU Lu,WU Xiaohe,ZHANG Mingzhen,et al. Strong reflection identification and separation based on the local frequency constrained dynamic matching pursuit[J]. Oil Geophysical Prospecting,2019,54(3):587-593.

[13] 张在金,张军华,李军,等. 煤系地层地震强反射剥离方法研究及低频伴影分析[J]. 石油地球物理勘探,2016,51(2):376-383. ZHANG Zaijin,ZHANG Junhua,LI Jun,et al. A method for stripping coal seam strong reflection and low-frequency shadow analysis[J]. Oil Geophysical Prospecting,2016,51(2):376-383.

[14] 朱博华,向雪梅,张卫华. 匹配追踪强反射层分离方法及应用[J]. 石油物探,2016,55(2):280-287. ZHU Bohua,XIANG Xuemei,ZHANG Weihua. Strong reflection horizons separation based on matching pursuit algorithm and its application[J]. Geophysical Prospecting for Petroleum,2016,55(2):280-287.

[15] 王丽,胡响明. 相长干涉:电磁诱导吸收[J]. 物理学报,2004,53(8):2544-2550. WANG Li,HU Xiangming. Constructive interference:electromagnetically induced absorptrion[J]. Acta Physica Sinica,2004,53(8):2544-2550.

[16] 张运龙,丁峰,尹成,等. 基于楔形模型的波形结构属性特征研究[J]. 物探化探计算技术,2018,40(5):587-593. ZHANG Yunlong,DING Feng,YIN Cheng,et al. Study on the characteristics of waveform structure attributes based on wedge model[J]. Computing Techniques for Geophysical and Geochemical Exploration,2018,40(5):587-593.

[17] 黄文锋,姚逢昌,李宏兵. 薄互层调谐规律研究与净厚度估算[J]. 石油地球物理勘探,2012,47(4):584-591. HUANG Wenfeng,YAO Fengchang,LI Hongbing. Regularities of tuning effects of thin interbedded layers and their net thickness determination[J]. Oil Geophysical Prospecting,2012,47(4):584-591.

[18] 郭彦省,孟召平,杨瑞昭,等. 地震属性及其在煤层厚度预测中的应用[J]. 中国矿业大学学报,2004,33(5):557-562. GUO Yansheng,MENG Zhaoping,YANG Ruizhao,et al. Seismic attributions analysis and it's application in predicting thickness of coal[J]. Journal of China University of Mining & Technology,2004,33(5):557-562.

[19] 李启成,郭雷,孙颍川,等. 地震属性融合技术在煤层厚度预测中的研究[J]. 地球物理学进展,2017,32(5):2014-2020. LI Qicheng,GUO Lei,SUN Yingchuan,et al. Seismic attributes fusion and its research in predicting thickness of coal[J]. Progress in Geophysics,2017,32(5):2014-2020.

[20] 彭苏萍,邹冠贵,李巧灵. 测井约束地震反演在煤厚预测中的应用研究[J]. 中国矿业大学学报,2008,37(6):729-733. PENG Suping,ZOU Guangui,LI Qiaoling. Seam thickness prediction methods based on the logging constrained seismic inversion[J]. Journal of China University of Mining &Technology,2008,37(6):729-733.