川东高陡构造带地震勘探回顾、“九五”研究新进展及攻关建议
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摘要
川东地区于 1 976年开始地震勘探 ,集“大山区、石灰岩、陡构造”等三大难关于一体的川东高陡构造带地震勘探 ,经历了 2 5年的攻关试验、综合研究和生产实践 ,才取得突破性进展 ,大体经历了四个阶段 :第一阶段 ,对高陡构造地震反射波场的特征和复杂性认识不清 ,误把低点当高点 ,造成钻探失误 ;第二阶段 ,研究认识了其反射波场特征和复杂性 ,加强了方法研究 ,成果的可靠性有所提高 ;第三阶段 ,地震、地质紧密结合 ,地质上解体高陡构造 ,利用地质钻井资料建立地质模型 ,指导地震建立物理模型 ,研制了新的资料处理方法 ,使地震资料和成果精度提高 ,钻探符合率大大提高 ,取得了突破性进展 ;第四阶段 ,在应用新技术同时 ,针对钻探揭示出的新问题 ,利用地质、地震、测井资料综合深化研究 ,取得了新的进展和成果。但是高陡构造地震勘探仍有一些问题未解决。文章回顾了勘探历程 ,概要总结了研制和应用的技术、认识 ,提出了目前还存在的问题和今后深化研究的思路和具体建议。
In East Sichuan,the seismic exploration of high and steep structural zones,which collect together three difficuties as “big mountains,limestones and steep structures”,started in 1976.Only by undergoing key test,synthetic study and productive practice for 25 years has a breakthrough progress in it been achieved.About four stages have been undergone:the first,because the characteristics and complexity of seismic reflection wave field were not fully understood,a structural high was always taken as a structural low,which made a failure in drilling;the second,through researching,the characteristics and complexity of seismic reflection wave field were recognized and the reliability of seismic results was raised owing to strengthening the research on methods;the third,through closely combining seism with geology and geologically decomposing the high and steep structures,a seismic physical model was set up on the basis of building a geological model by use of geological and drilling data and some new data processing methods were developed,which caused the accuracies of seismic data and results and the drilling success rate to be greatly arised,a breakthrough progress being achieved;and the fourth,while the new techniques were applied,in light of the new problems revealed by drilling some new progress and results were achieved through synthetically studying by use of the geological,seismic and well logging data.However,there are still some unsolved problems in the seismic exploration of the high and steep structures.On the basis of looking back on the exploration process and of generally summarizing the developed and applied techniques and cognizance,the existent problems,the ideas of deepening the research in the future and some concrete suggestions are proposed in the paper.
In East Sichuan,the seismic exploration of high and steep structural zones,which collect together three difficuties as “big mountains,limestones and steep structures”,started in 1976.Only by undergoing key test,synthetic study and productive practice for 25 years has a breakthrough progress in it been achieved.About four stages have been undergone:the first,because the characteristics and complexity of seismic reflection wave field were not fully understood,a structural high was always taken as a structural low,which made a failure in drilling;the second,through researching,the characteristics and complexity of seismic reflection wave field were recognized and the reliability of seismic results was raised owing to strengthening the research on methods;the third,through closely combining seism with geology and geologically decomposing the high and steep structures,a seismic physical model was set up on the basis of building a geological model by use of geological and drilling data and some new data processing methods were developed,which caused the accuracies of seismic data and results and the drilling success rate to be greatly arised,a breakthrough progress being achieved;and the fourth,while the new techniques were applied,in light of the new problems revealed by drilling some new progress and results were achieved through synthetically studying by use of the geological,seismic and well logging data.However,there are still some unsolved problems in the seismic exploration of the high and steep structures.On the basis of looking back on the exploration process and of generally summarizing the developed and applied techniques and cognizance,the existent problems,the ideas of deepening the research in the future and some concrete suggestions are proposed in the paper.
引文
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