辽河盆地东部凹陷中基性火山岩相地震响应特征及其机理探讨

Relationship between intermediate-mafic volcanic facies and their corresponding seismic reflections:a case study from eastern depression of Liaohe Basin

(1.吉林大学地球科学学院，吉林长春130061；2.中国石油天然气股份公司辽河油田分公司勘探开发研究院，辽宁盘锦124010；3.中国人民武装警察部队黄金部队第一支队，黑龙江牡丹江157021)

(1.College of Earth Sciences,Jilin University,Changchun 130061,China; 2.Development & Production Research Institute of Liaohe Oilfield,Panjin 124010,China; 3.Gold Headquarters of CAPF,Mudanjiang 157021,China)

研究了辽河盆地东部凹陷21口典型钻井13 043 m火山岩井段的岩性和岩相, 观察描述了218 m岩心和294个岩心薄片, 据此划分出该区火山岩5相14亚相；通过地震资料井旁地震相分析，识别出了火山颈亚相、次火山岩亚相、侵出相、爆发相、玻质碎屑岩亚相、板状/复合熔岩流亚相和火山沉积相等7种岩相/亚相，分析了各种火山岩相的地质属性、地震反射特征和地震响应机理；根据7种岩相/亚相的反射特征模式建立了相应的地震识别模板。将该识别模板用于研究区火山岩相填图, 结果为钻探所证实，表明所建立的火山岩相地震识别模板适用于研究区新生代中基性火山岩储层评价。

Based on 218 m drilling cores,294 core wafers and 13 043 m volcanogenic sections of well drilling from 21 representative boreholes from the eastern depression of Liaohe Basin,5 facies and 14 subfacies were divided.Meanwhile,by wellside seismic facies analysis,7 lithofacies/subfacies sush as diatreme subfacies,sub volcanic subfacies,extrusive facies,explosive facies,hyaloclastite subfacies,tabular/composite lava subfacies and volcanogenic sedimentary facies were recognized,and their geological properties,seismic reflection characteristics and seismic response mechanism were discussed in detail.From the seismic response characteristics correspond to the 7 lithofacies/subfacies,the seismic identification template of volcanic facies was established and to be used in subsurface mapping of the volcanic reservoirs in the study area and has been proved effectively by drilling data.

10.3969/j.issn.1000-1441.2014.02.011