二维地震勘探在天津南部平原区地质调查工作中的应用  

Applied Research of 2D Seismic Exploration in Geological Survey of the southern Tianjin

作　　者：付小锦[1] 王志刚[1] 江胜国[1] 许甜甜 曹健[1] FU Xiao-jin;WANG Zhi-gang;JIANG Sheng-guo;XU Tian-tian;CAO Jian(North China Geological Exploration Bureau of Tianjin, Tianjin 300170, China)

机构地区：[1]天津华北地质勘查局,天津300170

出　　处：《华北地质》2021年第4期68-75,84,共9页North China Geology

基　　金：天津市重点研发计划科技支撑重点项目“天津市深部煤炭地下气化关键技术研究(17YFZCSF00940)”。

摘　　要：二维地震勘查是区域地质调查的重要手段之一。本次研究通过二维地震勘探在天津南部第四系深覆盖平原区地质调查工作中的运用,成功揭示了古河道、第四系及新生界底界面的埋深和空间展布特征,查清了研究区构造格架,了解了研究区地层和区内厚大煤层5煤、10煤的埋深和起伏形态,标定了页岩气优选目标层位,并通过钻探、化验等手段,验证了二维地震勘探成果的可靠性。古河道底板埋深预测误差为3.6%;第四系底界面埋深预测误差为8.4%;新生界底界面埋深预测误差为0.7%;5煤埋深预测误差为0.4%;10煤埋深预测误差为1.3%;页岩气优选目标层位预测误差为0.7%。结果表明,本次二维地震预测误差均在10%以内,符合相关规范要求,因此,在第四系深覆盖地区运用二维地震勘探方法解决地质调查中的一些问题是可行的。Two-dimensional seismic surveys are one of the important means of regional geological surveys.Through the application of 2D seismic exploration in the geological survey of the southern plain of Tianjin, it revealed successfully the depth and spatial distribution characteristics of the paleo-channels, the Quaternary and the Cenozoic bottom boundary, ascertained the tectonic framework of the research area, realized the strata,researched the ups and downs of the thick large coal seams of 5 coal and 10 coal, determined the preferred target layer of shale gas, and verified the 2D seismic exploration results by drilling, testing etc. The prediction error of the bottom depth of the paleo-channel is 3.6%;the bottom boundary of Quaternary is 8.4%;the bottom boundary of Cenozoic is 0.7%;the 5 coal is 0.4%;the 10 coal is 1.3%;the preferred target layer of shale gas is 0.7%. The results show that the prediction errors of this 2D seismic are all within 10%, which complied with the relevant requirements of the specification. For the deep coverage area of Quaternary, it is feasible to use the 2D seismic exploration technology to solve problems in the geological survey.

关 键 词：二维地震 地质调查 深覆盖区 天津南部 应用研究 

分 类 号：P631.4[天文地球—地质矿产勘探]