藏北羌塘盆地反射地震剖面与叠加速度研究
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摘要
本文主要阐述藏北羌塘盆地龙尾错区块的二维反射地震试验的数据采集和处理的过程。分析两条剖面的反射特征,并对叠加剖面进行了初步解释:羌塘盆地中央隆起北侧存在大规模的深凹陷构造;盆地浅部不同方向的构造变形存在较大差异;出现较强的基底反射特征;中生代、古生代地层的反射特征差异较大。文中尝试对数据处理过程中的叠加速度变化进行研究,获得了与叠加剖面较一致的结果,并进一步对某探井的构造背景提出见解。
This paper deals with the test conducted along two 2-D seismic reflection profiles in Longweicuo area of north Qiangtang basin, Tibet. Flows and parameters of seismic data acquisition and processing are discussed, and the main characteristics of the two profiles are interpreted tentatively. Some conclusions have been reached: there is a large-sized deep depression on the north wedge of the central uplift in Qiangtang basin; there exist obviously different reflections of structural deformation in different directions, with the basement showing strong reflections and Paleozoic strata displaying weak reflections; there also exist apparent differences between Mesozoic strata and Paleozoic strata. The authors studied stack velocity from data-processing and obtained a result consistent with the stack seismic data. Furthermore, some opinions were put forward on the structural background of a drilling hole arranged near one of the seismic profiles.
This paper deals with the test conducted along two 2-D seismic reflection profiles in Longweicuo area of north Qiangtang basin, Tibet. Flows and parameters of seismic data acquisition and processing are discussed, and the main characteristics of the two profiles are interpreted tentatively. Some conclusions have been reached: there is a large-sized deep depression on the north wedge of the central uplift in Qiangtang basin; there exist obviously different reflections of structural deformation in different directions, with the basement showing strong reflections and Paleozoic strata displaying weak reflections; there also exist apparent differences between Mesozoic strata and Paleozoic strata. The authors studied stack velocity from data-processing and obtained a result consistent with the stack seismic data. Furthermore, some opinions were put forward on the structural background of a drilling hole arranged near one of the seismic profiles.
引文
方慧,等.羌塘盆地龙尾湖区块连续电磁剖面(CEMP)测量成果报告,2007.
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[7]卢占武,高锐,薛爱民,等.羌塘盆地石油地震反射新剖面及基底构造浅析[J].中国地质,2006,33(2):286-289.Lu Zhanwu,Gao Rui,Xue Aimin,et al.New seismic reflection profiles and basement structure in Qiangtang basin,Northern Tibet[J].Geology in China,2006,33(2):286-289(in Chinese with English abstract).
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[9]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.Zhao Zhengzhang,Li Yongtie,Ye Hefei,et al.Petroleum Geology of Qitang Basin in Tibet[M].Beijing:Science Press,2000(in Chinese with English abstract).
[10]赵文津,赵逊,蒋忠惕,等.西藏羌塘盆地的深部结构特征与含油气远景评价[J].中国地质,2006,33(1):1-13.Zhao Wenjin,Zhao Xun,Jiang Zhongti,et al.Deep structure and petroleum prospect evalution of the Qiangtang basin,Tibet[J].Geology in China,2006,33(1):1-13(in Chinese with English abstract).
[11]Chakraborty A著,徐炎东译.利用小波变换法对地震数据进行频率-时间域分解[J].勘探地球物理进展,1996,(3):0-21.Chakraborty A(translated by XuYandong).Analysis on seismic data in frequency-time domain using wavelet transform[J].Preogress in Exploration Geophysics,1996(3):10-21(in Chinese).
[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.Yin An.Geologic evolution of the Himalayan-Tibetan orogen-Asia continetal growth when Phanerozonic[J].Acta Geoscientia Sinica,2001,22(3):193-230(in Chinese with English abstract).
[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.Gao Rui,Wu Gongjian.Geophysical model and geodynamic process of Yadong-Ge'ermu geoscience transect in Qinghai-Tibet plateau[J].Journal of Changchun University of Earth Science,1995,25(3):241-250(in Chinese with English abstract).
[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.Huang Jijun,Yi Haisheng,Lin Jinhui.Structural features of the Qiangtang basin and preliminary analysis on oil-gas potentials[J].Chinese Journal of Geology,2003,39(1):1-10(in Chinese with English abstract).
[4]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.Wang Chengshan,Yi Haisheng,Li Yong,et al.Geological Evolution and Prospective Evaluation for Oil and Gas of the Qiangtang basin,Tibet[M].Beijing:Geological Publishing House,2001(in Chinese).
[5]贾建称,吴新国,王根厚,等.羌塘盆地东部中生代沉积特征与构造演化[J].中国地质,2006,33(5):999-1004.Jia Jiancheng,Wu Xinguo,Wang Genhou,et al.Mesozoic sedimentary characteristics and tectonic evolution in the eastern part of the Qiangtang basin[J].Geology in China,2006,33(5):999-1004(in Chinese with English abstract).
[6]和钟铧,杨德明,李才.藏北羌塘盆地褶皱形变研究[J].中国地质,2003,30(4):357-360.He Zhonghua,Yang Deming,Li Cai.Folds in the Qiangtang basin,northern Tibet[J].Geology in China,2003,30(4):357-360(in Chinese with English abstract).
[7]卢占武,高锐,薛爱民,等.羌塘盆地石油地震反射新剖面及基底构造浅析[J].中国地质,2006,33(2):286-289.Lu Zhanwu,Gao Rui,Xue Aimin,et al.New seismic reflection profiles and basement structure in Qiangtang basin,Northern Tibet[J].Geology in China,2006,33(2):286-289(in Chinese with English abstract).
[8]卢占武,高锐,匡朝阳,等.青藏高原羌塘盆地二维地震数据采集方法试验研究[J].地学前缘,2006,13(5):382-390.Lu Zhanwu,Gao Rui,Kuang Zhaoyang,et al.Acquisition technique test of2-D seismic survey in Qiangtang basin of Tibet[J].Earth Science Frontiers,2006,13(5):382-390(in Chinese with English abstract).
[9]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.Zhao Zhengzhang,Li Yongtie,Ye Hefei,et al.Petroleum Geology of Qitang Basin in Tibet[M].Beijing:Science Press,2000(in Chinese with English abstract).
[10]赵文津,赵逊,蒋忠惕,等.西藏羌塘盆地的深部结构特征与含油气远景评价[J].中国地质,2006,33(1):1-13.Zhao Wenjin,Zhao Xun,Jiang Zhongti,et al.Deep structure and petroleum prospect evalution of the Qiangtang basin,Tibet[J].Geology in China,2006,33(1):1-13(in Chinese with English abstract).
[11]Chakraborty A著,徐炎东译.利用小波变换法对地震数据进行频率-时间域分解[J].勘探地球物理进展,1996,(3):0-21.Chakraborty A(translated by XuYandong).Analysis on seismic data in frequency-time domain using wavelet transform[J].Preogress in Exploration Geophysics,1996(3):10-21(in Chinese).
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