青藏高原羌塘盆地二维地震数据采集方法试验研究
|
摘要
羌塘盆地地表地质条件复杂,地震资料信噪比低,取得高质量的地震剖面存在很大困难。为了改善这一问题,我们通过50km长的二维反射地震试验剖面,初步探索出一套适用于羌塘地区地震资料采集的方法技术。研究对比表明,合理加大接收排列,采用有效深井、药量,添加适当大炮与适当延长记录长度等措施能够在该地区获得较丰富的地下反射信息。从试验处理的剖面看,该施工方式是合理的、有效的。
It is difficult to acquire a high quality seismic section for the Qiangtang basin of Tibet because of complex seismic-geological conditions and low signal-noise ratio in this area.In order to determine acquisition methods suitable for the features of this basin,we conducted a test along seismic reflection profile with 50 km long.The seismic profile is a common-depth-point(CDP)stacked section acquired with explosive source using I/O Image 24-places seismograph,480 receiver-groups,30 m receiver-group spacing,2 millisecond samplings.The 16-kilogram explosives were generally placed in a single well,as deep as 18 m,space is 150 m,and 60-fold.To surely increase energy of reflection wave,we had also taken a large explosive weight of 100 kilograms,combined wells at the depth of 18 m.PROMAX data process system was used to process seismic data.The preliminary seismic reflection time profiles reveal fine reflection images and offer a great deal of helpful information for studying the structure of the Qiangtang basin.The result shows that lengthening the array,deploying valid well depth and explosive quantity,adding reasonable shot with a large quantity of explosives and prolonging record time are necessary to acquire abundant reflection in this area.The test processing profiles show that this method is both feasible and effective.
It is difficult to acquire a high quality seismic section for the Qiangtang basin of Tibet because of complex seismic-geological conditions and low signal-noise ratio in this area.In order to determine acquisition methods suitable for the features of this basin,we conducted a test along seismic reflection profile with 50 km long.The seismic profile is a common-depth-point(CDP)stacked section acquired with explosive source using I/O Image 24-places seismograph,480 receiver-groups,30 m receiver-group spacing,2 millisecond samplings.The 16-kilogram explosives were generally placed in a single well,as deep as 18 m,space is 150 m,and 60-fold.To surely increase energy of reflection wave,we had also taken a large explosive weight of 100 kilograms,combined wells at the depth of 18 m.PROMAX data process system was used to process seismic data.The preliminary seismic reflection time profiles reveal fine reflection images and offer a great deal of helpful information for studying the structure of the Qiangtang basin.The result shows that lengthening the array,deploying valid well depth and explosive quantity,adding reasonable shot with a large quantity of explosives and prolonging record time are necessary to acquire abundant reflection in this area.The test processing profiles show that this method is both feasible and effective.
引文
中石油物探局第四地质调查处.羌塘盆地毕洛错地区二维地震勘探野外采集施工总结,1997.
[1]YI N An.Geologic evolution of the Hi malayan-Tibetan oro-gen—Phanerozoic growth of Asia continental[J].Acta Geo-scientia Sinica,2001,22(3):193-230(in Chinese).
[2]GAO Rui,WU Gongjian.Geophysical model and geodynamic process of Yadong-Gol mud geoscience transect in Qinghai-Ti-bet plateau[J].Journal of Changchun University of Earth Sciences,1995,25(3):241-250(in Chinese).
[3]HUANGJijun,YI Haisheng,LI NJinhui.Structural charac-teristics and oil and gas bearing perspective evaluation of the Qiangtang basin[J].Chinese Journal of Geology,2003,39(1):1-10(in Chinese).
[4]ZHAO Zhengzhang,LI Yongtie,YE Hefei,et al.Formation of the oil and gas of marine source rocks in the Tibet plateau[M].Beijing:Science Press,2000:214-268(in Chinese).
[5]ZHAO Zhengzhang,LI Yongtie,YE Hefei,et al.Petroleum geology in Qiangtang basin[M].Beijing:Science Press,2000:344-387(in Chinese).
[6]ZHAO Zhengzhang,LI Yongtie,YE Hefei,et al.Structure feature and evolution of the Tibet plateau[M].Beijing:Sci-ence Press,2000:208-230(in Chinese).
[7]WANG Chengshan,YI Haisheng,LI Yong,et al.Geological evaluation and petroleumperspective evaluation of Qiangtang basin[M].Beijing:Geological Publishing House,2001(in Chinese).
[8]CHEN Lan,YI Haisheng,HU Ruizhong.The discovery of Jurassic coccolithophorein Qiangtang area of northern Tibet-an plateau and its significance[J].Earth Science Frontiers,2003,10(4):613-618(in Chinese).
[9]ZHAO Zhidan,MO Xuanxue,LUO Zhaohua,et al.Subduc-tion of India beneath Tibet:magmatism evidence[J].Earth Science Frontiers,2003,10(3):149-157(in Chinese).
[10]LU Bing,XU Keqiang,LI U Chiyang,et al.Electrical struc-ture of crust in the Qiangtang region,northern Tibet andits geological significance[J].Earth Science Frontiers,2003,10(Suppl):153-159(in Chinese).
[11]WEI Wenbo,UNSWORTH M,JONES A,et al.Detection of widespread fluids in the Tibetan crust by magnetotelluric studies[J].Science,2001,292:716-718.
[1]尹安.喜马拉雅-青藏高原造山带地质演化[J].地球学报,2001,22(3):193-230.
[2]高锐,吴功建.青藏高原亚东-格尔木地学断面地球物理综合解释模型与现今地球动力学过程[J].长春地质学院学报,1995,25(3):241-250.
[3]黄继钧,伊海生,林金辉.羌塘盆地构造特征及油气远景初步分析[J].地质科学,2003,39(1):1-10.
[4]赵政璋,李永铁,叶和飞,等.青藏高原海相烃源层的油气生成[M].北京:科学出版社,2000:214-268.
[5]赵政璋,李永铁,叶和飞,等.青藏高原羌塘盆地石油地质[M].北京:科学出版社,2000:344-387.
[6]赵政璋,李永铁,叶和飞,等.青藏高原大地构造特征及盆地演化[M].北京:科学出版社,2000:208-230.
[7]王成善,伊海生,李勇,等.羌塘盆地地质演化与油气远景评价[M].北京:地质出版社,2001.
[8]陈兰,伊海生,胡瑞忠.藏北羌塘地区侏罗纪颗石藻化石的发现及其意义[J].地学前缘,2003,10(4):613-618.
[9]赵志丹,莫宣学,罗照华,等.印度-亚洲俯冲带结构———岩浆作用证据[J].地学前缘,2003,10(3):149-157.
[10]鲁兵,许可强,刘池阳.藏北羌塘地区的地壳电性结构及其意义[J].地学前缘,2003,10(增刊):153-159.
[1]YI N An.Geologic evolution of the Hi malayan-Tibetan oro-gen—Phanerozoic growth of Asia continental[J].Acta Geo-scientia Sinica,2001,22(3):193-230(in Chinese).
[2]GAO Rui,WU Gongjian.Geophysical model and geodynamic process of Yadong-Gol mud geoscience transect in Qinghai-Ti-bet plateau[J].Journal of Changchun University of Earth Sciences,1995,25(3):241-250(in Chinese).
[3]HUANGJijun,YI Haisheng,LI NJinhui.Structural charac-teristics and oil and gas bearing perspective evaluation of the Qiangtang basin[J].Chinese Journal of Geology,2003,39(1):1-10(in Chinese).
[4]ZHAO Zhengzhang,LI Yongtie,YE Hefei,et al.Formation of the oil and gas of marine source rocks in the Tibet plateau[M].Beijing:Science Press,2000:214-268(in Chinese).
[5]ZHAO Zhengzhang,LI Yongtie,YE Hefei,et al.Petroleum geology in Qiangtang basin[M].Beijing:Science Press,2000:344-387(in Chinese).
[6]ZHAO Zhengzhang,LI Yongtie,YE Hefei,et al.Structure feature and evolution of the Tibet plateau[M].Beijing:Sci-ence Press,2000:208-230(in Chinese).
[7]WANG Chengshan,YI Haisheng,LI Yong,et al.Geological evaluation and petroleumperspective evaluation of Qiangtang basin[M].Beijing:Geological Publishing House,2001(in Chinese).
[8]CHEN Lan,YI Haisheng,HU Ruizhong.The discovery of Jurassic coccolithophorein Qiangtang area of northern Tibet-an plateau and its significance[J].Earth Science Frontiers,2003,10(4):613-618(in Chinese).
[9]ZHAO Zhidan,MO Xuanxue,LUO Zhaohua,et al.Subduc-tion of India beneath Tibet:magmatism evidence[J].Earth Science Frontiers,2003,10(3):149-157(in Chinese).
[10]LU Bing,XU Keqiang,LI U Chiyang,et al.Electrical struc-ture of crust in the Qiangtang region,northern Tibet andits geological significance[J].Earth Science Frontiers,2003,10(Suppl):153-159(in Chinese).
[11]WEI Wenbo,UNSWORTH M,JONES A,et al.Detection of widespread fluids in the Tibetan crust by magnetotelluric studies[J].Science,2001,292:716-718.
[1]尹安.喜马拉雅-青藏高原造山带地质演化[J].地球学报,2001,22(3):193-230.
[2]高锐,吴功建.青藏高原亚东-格尔木地学断面地球物理综合解释模型与现今地球动力学过程[J].长春地质学院学报,1995,25(3):241-250.
[3]黄继钧,伊海生,林金辉.羌塘盆地构造特征及油气远景初步分析[J].地质科学,2003,39(1):1-10.
[4]赵政璋,李永铁,叶和飞,等.青藏高原海相烃源层的油气生成[M].北京:科学出版社,2000:214-268.
[5]赵政璋,李永铁,叶和飞,等.青藏高原羌塘盆地石油地质[M].北京:科学出版社,2000:344-387.
[6]赵政璋,李永铁,叶和飞,等.青藏高原大地构造特征及盆地演化[M].北京:科学出版社,2000:208-230.
[7]王成善,伊海生,李勇,等.羌塘盆地地质演化与油气远景评价[M].北京:地质出版社,2001.
[8]陈兰,伊海生,胡瑞忠.藏北羌塘地区侏罗纪颗石藻化石的发现及其意义[J].地学前缘,2003,10(4):613-618.
[9]赵志丹,莫宣学,罗照华,等.印度-亚洲俯冲带结构———岩浆作用证据[J].地学前缘,2003,10(3):149-157.
[10]鲁兵,许可强,刘池阳.藏北羌塘地区的地壳电性结构及其意义[J].地学前缘,2003,10(增刊):153-159.
版权所有：© 2023 中国地质图书馆 中国地质调查局地学文献中心