东海陆架区中北部前第三系基底综合地球物理研究
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摘要
从地震、钻井资料出发,结合周边地质特征,推断东海陆架区中北部存在中生界和古生界地层。结合地震资料,正演消除了海底和新生界密度不均匀在重力场上的影响,定量反演重、磁力异常并求取了重力基底和磁性基底。重力基底的特征在东西分带的大背景下表现出“靠陆侧南北分块,靠洋侧东西分带”的特点。西湖凹陷区的磁性基底与重力基底埋深大致相同,不一致地方可能是受岩体的影响。西湖凹陷以西地区,包括海礁凸起等单元,总体出现磁性基底埋深比重力基底埋深深2km左右,初步解释为古生界地层的反映。中生界地层厚度的分布也具有东西分带和南北分块特点。西湖凹陷西缘的中生界地层厚度大,其中带中生界虽然含有一定的火山岩或火山碎屑岩,但沉积岩更多,这对下一步的油气勘探有利。
Mesozoic and Paleozoic strata were deduced to exist in the study area on the basis of seismic and borehole data and the geological features in the adjacent areas. The gravity effects resulted from inhomogeneous densities of the sea bottom and Cenozoic strata were removed by forward modeling based on seismic data. Moreover, the gravitational and magnetic basements were obtained by quantitative inversion of gravity & magnetic anomalies. The gravity basement represented the features of block shape in south-north direction near the continent flank and stripe shape in east-west direction near the ocean flank in the overall background of stripe style in east-west direction. The magnetic basement of Xihu sag was roughly similar to the gravity basement except the effects of intrusive rocks. On the whole, the buring depth of magnetic basement to the west of Xihu sag, including the units such as Haijiao uplift, was about 2 km deeper than that of the gravity basement, which was interpreted as the effects of Paleozoic strata. The thickness distribution of Mesozoic strata also behaved itself with the features of block shape in south-north direction and stripe shape in east-west direction . The thickness of Mesozoic strata in the west area of Xihu sag was relatively large as a result of depositing certain volcanic rocks or pyroclastic rocks and large amounts of sedimentary rocks, which was beneficial to the further oil and gas exploration. Finally, the characteristics of Mesozoic thickness distribution were analyzed in the paper.
Mesozoic and Paleozoic strata were deduced to exist in the study area on the basis of seismic and borehole data and the geological features in the adjacent areas. The gravity effects resulted from inhomogeneous densities of the sea bottom and Cenozoic strata were removed by forward modeling based on seismic data. Moreover, the gravitational and magnetic basements were obtained by quantitative inversion of gravity & magnetic anomalies. The gravity basement represented the features of block shape in south-north direction near the continent flank and stripe shape in east-west direction near the ocean flank in the overall background of stripe style in east-west direction. The magnetic basement of Xihu sag was roughly similar to the gravity basement except the effects of intrusive rocks. On the whole, the buring depth of magnetic basement to the west of Xihu sag, including the units such as Haijiao uplift, was about 2 km deeper than that of the gravity basement, which was interpreted as the effects of Paleozoic strata. The thickness distribution of Mesozoic strata also behaved itself with the features of block shape in south-north direction and stripe shape in east-west direction . The thickness of Mesozoic strata in the west area of Xihu sag was relatively large as a result of depositing certain volcanic rocks or pyroclastic rocks and large amounts of sedimentary rocks, which was beneficial to the further oil and gas exploration. Finally, the characteristics of Mesozoic thickness distribution were analyzed in the paper.
引文
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[4]李培廉、侯鸿斌,马惠福.东海陆架裂谷盆地的结构和石油[A].周玉琦.朱夏油气地质理论应用研讨文集[C].北京:地质出版社,2001.269—278.
[5]陈冰,王家林,吴健生.东海陆架盆地海礁凸起南块基底性质研究[J].石油实验地质,2002,24(4):301—305.
[6]沈然清,李上卿,谢仁海.东海盆地岩浆活动[A].刘申叔,等.东海油气地球物理勘探[M].北京:地质出版社,2001.60—69.
[7]上海市地矿局.上海市区域地质志[M].北京:地质出版社,1989.7—15.
[8]薄玉玲,高德章,杨秀华.东海陆架盆地岩石物性参数研究与应用[A].刘申叔等.东海油气地球物理勘探[M].北京:地质出版社,2001.261—267.
[9]杨文采,施志群,侯遵泽,等.离散小波变换与重力异常多重分解[J].地球物理学报,2001,44(4):534—541.
[10]王家林,王一新,万明浩.石油重磁解释[M].北京:石油工业出版社,1991.140—281.
[11]陈冰,王家林,吴健生.东海陆架盆地基底结构的综合地球物理研究[A].王家林,吴健生.中国典型含油气盆地综合地球物理研究[M].上海:同济大学出版社,1995.43—57.
[12]吴健生,张丽莉.应用模糊神经网络反演海底重力密度界面[A].中国地球物理学会年刊[C].昆明:云南科技出版社,2001.240.
[13]李廷栋,莫杰.中国滨太平洋构造域构造格架和东海地质演化[J].海洋地质与第四纪地质,2002,22(4):1—6.
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