米泉山前构造带地球物理模型建立及应用
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摘要
山前构造带一直是油气勘探的重点区域,但由于山前地形起伏大、纵向岩性变化快,地表被巨厚戈壁砾石覆盖,地下构造复杂、断裂发育,给地震勘探带来野外施工、静校正和速度分析等问题,最终导致采集资料信噪比低,不能准确成像。首先,通过开展非地震研究,弄清地下地质结构和盆山关系,提供非地震资料解释的初步的模型,结合其他勘探资料,建立山前相对合理的二维地下地质模型;其次,研究基于模型面向目的层的地震波照明和观测系统设计,利用分析得到的观测系统指导野外地震资料采集。通过对地震资料的分析认为,基于模型面向目的层的观测系统设计,采集的地震资料质量好、信噪比高。
Piedmont is always an important region in prospecting for petroleum.Problems related to large relief of landform,rapid change of lithology in vertical direction,coverage of thick Gobi gravel,complex subsurface structure,and rich faulting impede the field operation of seismic survey,and pose great challenges to static correction and velocity analysis,which in turn leads to data of low signal-to-noise ratio and poor imaging.In this paper,we firstly adopted nonseismic survey to determine subsurface geology and constructed a preliminary earth model that is then refined with other survey data.Secondly,we designed the survey geometry through seismic illumination study.Finally,The results were used to guide the acquisition operation.Higher quality and higher S/N ratio data have been acquired.
Piedmont is always an important region in prospecting for petroleum.Problems related to large relief of landform,rapid change of lithology in vertical direction,coverage of thick Gobi gravel,complex subsurface structure,and rich faulting impede the field operation of seismic survey,and pose great challenges to static correction and velocity analysis,which in turn leads to data of low signal-to-noise ratio and poor imaging.In this paper,we firstly adopted nonseismic survey to determine subsurface geology and constructed a preliminary earth model that is then refined with other survey data.Secondly,we designed the survey geometry through seismic illumination study.Finally,The results were used to guide the acquisition operation.Higher quality and higher S/N ratio data have been acquired.
引文
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6王家林.石油重磁解释[M].北京:石油工业出版社,1991.373
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2王屿涛,谷斌,王立宏.准噶尔盆地南缘油气成藏聚集史[J].石油与天然气地质,1998,19(4):291～296
3阎世信编著.山地地球物理勘探技术[M].北京:石油工业出版社,2000.284
4刘光鼎著.地球物理引论[M].上海:科学技术出版社,2005.95～96
5郝守玲,赵群.地震物理模型技术的应用与发展[J].勘探地球物理进展,2002,25(2):34～42
6王家林.石油重磁解释[M].北京:石油工业出版社,1991.373
7于鹏,有限差分法大地电磁多参数偏移成像[J].地球物理学报,2001,44(4):552～562
8张钋,刘洪.射线追踪方法的发展现状[J].地球物理学进展,2000,15(1):36～45
9Hubral P,Hocht G,Jaeger R.Seismic illumination[J].The Leading Edge,1999,18(11):1268～1271
10佘德平.波场数值模拟技术[J].勘探地球物理进展,2004,27(1):16～21
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