环渤海地区地壳结构及其动力学特征研究
|
摘要
环渤海地区是我国大陆东部强震的多发区,也是我国地震重点监测地区,环绕渤海地区已经开发并投产了包括辽河、冀东、大港、胜利以及渤海海域在内的一系列油田,因此环渤海地区一直是我国地质与地球物理学科的研究重点.本文利用重力数据结合人工地震探测剖面应用调和级数法对该地区的莫霍面深度进行了反演计算,并应用地质、重、磁、地震层析成像、人工地震探测、地热、应力等方面的成果资料,对研究区的地球物理场、地壳结构、地球动力学特征进行了探讨,希望对环渤海地区的深部结构、地球动力学、油气资源等研究有所帮助.通过反演计算结果和动力学特征的分析,得到了以下的认识:1)该地区的布格重力异常主要特征为从陆地向海洋,异常从负异常向正异常变化,反映了地壳厚度自西向东逐渐变薄的总体特征.磁异常在研究区北部地区变化较为剧烈,呈正负交错状.大部分海域地区表现为负磁异常场区.重、磁异常走向主要为NE、NNE向;2)研究区地壳厚度在31～40km,总体趋势为自西向东逐渐减薄,通过与地震层析成像结果比较,两个结果十分吻合;3)渤海盆地动力学机制应是周边各个板块水平运动的远程效应所造成的多期构造应力场作用下多方向的伸展、拉张而成,渤海湾盆地的形成是四个时期、两种动力作用交替影响的结果.
Bohai Sea region is both the earthquake-prone areas of eastern Chinese mainland and China's focused earthquake monitoring areas,meanwhile it has been developed and put into production around the Bohai Sea area including a series of oilfield,like the Liaohe,Jidong,Dagang,Shengli and the Bohai Sea,which shows the Bohai Sea region has been the focus of geology and Geophysics.In this paper,combined with the artificial seismic profiles,we apply the harmonic progression method to inverse the Moho depth of the region with gravity data,and use the results of geology,gravity,magnetism,seismic tomography,artificial seismic exploration,geothermy,and stress to research the geophysical field,the crustal structure and geodynamics of the study area,which is hoped to be helpful to understand the deep structure Geodynamics,oil and gas resources around the Bohai Sea area.Through the the inversion results and analysis of dynamic characteristics,we get the following understandings: 1) Bouguer gravity anomalies of the study area change from negative anomalies to positive anomalies,when they are from land to sea,which reflects the general characteristics of the crustal thickness thinning gradually from west to east.Magnetic anomalies in the northern region of the study area change more dramatically,alternated with positive and negative number.Most of the waters show negative magnetic anomalies.The main trend of gravity and magnetic anomalies is NE,NNE.;2) The thickness of the crust around the Bohai Sea area ranges from 31km to 40km,and the general trend is thinning from west to east,which coincides with the results of seismic tomography;3) Kinetic mechanism of the Bohai Basin should be that the multi-phase tectonic stress field caused by remote effects of the horizontal movement of the surrounding plates has made the multi-direction stretch and tension,and what made the formation of the Bohai Bay Basin should be alternately affected by four periods and two kinds of dynamic actions.
Bohai Sea region is both the earthquake-prone areas of eastern Chinese mainland and China's focused earthquake monitoring areas,meanwhile it has been developed and put into production around the Bohai Sea area including a series of oilfield,like the Liaohe,Jidong,Dagang,Shengli and the Bohai Sea,which shows the Bohai Sea region has been the focus of geology and Geophysics.In this paper,combined with the artificial seismic profiles,we apply the harmonic progression method to inverse the Moho depth of the region with gravity data,and use the results of geology,gravity,magnetism,seismic tomography,artificial seismic exploration,geothermy,and stress to research the geophysical field,the crustal structure and geodynamics of the study area,which is hoped to be helpful to understand the deep structure Geodynamics,oil and gas resources around the Bohai Sea area.Through the the inversion results and analysis of dynamic characteristics,we get the following understandings: 1) Bouguer gravity anomalies of the study area change from negative anomalies to positive anomalies,when they are from land to sea,which reflects the general characteristics of the crustal thickness thinning gradually from west to east.Magnetic anomalies in the northern region of the study area change more dramatically,alternated with positive and negative number.Most of the waters show negative magnetic anomalies.The main trend of gravity and magnetic anomalies is NE,NNE.;2) The thickness of the crust around the Bohai Sea area ranges from 31km to 40km,and the general trend is thinning from west to east,which coincides with the results of seismic tomography;3) Kinetic mechanism of the Bohai Basin should be that the multi-phase tectonic stress field caused by remote effects of the horizontal movement of the surrounding plates has made the multi-direction stretch and tension,and what made the formation of the Bohai Bay Basin should be alternately affected by four periods and two kinds of dynamic actions.
引文
[1]刘光鼎,郝天珧,祝靓谊.环渤海地区油气资源探查的思考[J].地球物理学进展,2002,17(4):559-563.Liu G D,Hao T Y,Zhu L Y.Review on the exploration of oiland gas resources around the Bohai Region[J].Progress inGeophysics(in Chinese),2002,17(4):559-563.
[2]刘光鼎.中国海区及邻域地质地球物理特征[M].北京:科学出版社,1992.Liu G D.Geology and Geophysics Characters of China Sea andAdjacent Regions(in Chinese)[M].Beijing:Science Press,1992.
[3]周立宏,李三忠,刘建忠,等.渤海湾盆地区前第三系构造演化与潜山油气成藏模式[M].北京:中国科学技术出版社,2003.Zhou L H,Li S Z,Liu J Z,et al.Pre-Tertiary TectonicEvolution and Buried Hill-Type Oil-Gas Development andReservation Under the Bohai Bay Basin(in Chinese)[M].Beijing:China Science&Technology Press,2003.
[4]徐亚,郝天珧,戴明刚,等.渤海残留盆地分布综合地球物理研究[J].地球物理学报,2007,50(3):868-881.Xu Y,Hao T Y,Dai M G,et al.Integrated geophysicsresearch on distribution of residual basins of Bohai Sea[J].Chinese J.Geophys.(in Chinese),2007,50(3):868-881.
[5]郝天珧,杨长春,刘洪,等.环渤海地区前新生代油气资源的综合地质、地球物理研究[J].地球物理学进展,2007,22(4):1267-1279.Hao T Y,Yang C C,Liu H,et al.Integrated geological andgeophysical study for pre-cenozoic hydrocarbon resources inthe circum-bohai area[J].Progress in Geophysics(inChinese),2007,22(4):1267-1279.
[6]吉治平.渤海残留盆地油气地球物理研究综述[J].地球物理学进展,2005,20(4):1039-1046.Ji Z P.A review of progress on geophysics of Bohai residualbasin[J].Progress in Geophysics(in Chinese),2005,20(4):1039-1046.
[7]卢造勋,蒋秀琴,白云,等.胶辽渤海地区地壳上地幔结构特征与介质的横向非均匀性[J].华北地震科学,1999,17(2):43-51.Lu Z X,Jiang X Q,Bai Y,et al.Structural characteristics ofcrust and upper mantle and inhomogeneity of the medium inJiaoliao and Bohai regions[J].North China EarthquakeSciences(in Chinese),1999,17(2):43-51.
[8]周斌,张英凯,李继训.渤海及邻区地震地质、地球物理场和地震活动特征[J].西北地震学报,2000,22(3):333-337.Zhou B,Zhang Y K,Li J X.Characteristics of geology,geophysical field and seismic activity of Bohai sea and itsvicinity[J].Northwestern Seismological Journal(in Chinese),2000,22(3):333-337.
[9]邱楠生,魏刚,李翠翠,等.渤海海域现今地温场分布特征[J].石油与天然气地质,2009,30(4):412-419.Qiu N S,Wei G,Li C C,et al.Distribution features ofcurrent geothermal field in the Bohai Sea waters[J].Oil&Gas Geology(in Chinese),2009,30(4):412-419.
[10]肖卫勇,王良书,李华,等.渤海盆地地温场研究[J].中国海上油气(地质),2001,15(2):105-110.Xiao W Y,Wang L S,Li H,et al.Geotemperature field inBohai sea[J].China Offshore Oil and Gas(Geology)(inChinese),2001,15(2):105-110.
[11]王良书,刘绍文,肖卫勇,等.渤海盆地大地热流分布特征[J].科学通报,2002,47(2):151-155.Wang L S,Liu S W,Xiao W Y,et al.Distribution featuresof heat flow in Bohai basin[J].Chinese Science Bulletin(inChinese),2002,47(2):151-155.
[12]胡圣标,张容燕,罗毓晖,等.渤海盆地热历史及构造-热演化特征[J].地球物理学报,1999,42(6):748-755.Hu S B,Zhang R Y,Luo Y H,et al.Thermal history andtectonic-thermal evolution of Bohai basin,East China[J].Chinese J.Geophys.(in Chinese),1999,42(6):748-755.
[13]金安蜀,刘福田,孙永智.北京地区地壳和上地幔的三维P波速度结构[J].地球物理学报,1980,23(2):172-182.Jin A S,Liu F T,Sun Y Z.Three-Dimensional P velocitystructure of the crust and upper mantle under Beijing region[J].Chinese J.Geophys.(in Chinese),1980,23(2):172-182.
[14]朱露培,曾融生,刘福田.京津唐张地区地壳上地幔三维P波速度结构[J].地球物理学报,1990,33(3):267-277.Zhu L P,Zeng R S,Liu F T.Three-Dimensional P velocitystructure under the Beijing network area[J].Chinese J.Geophys.(in Chinese),1990,33(3):267-277.
[15]于湘伟,陈运泰,王培德.京津唐地区中上地壳三维P波速度结构[J].地震学报,2003,25(1):1-14.Yu X W,Chen Y T,Wang P D.Three-Dimensional P wavevelocity structure in Beijing-Tianjin-Tangshan area[J].ActaSeismologica Sinica(in Chinese),2003,25(1):1-14.
[16]Huang J L,Zhao D P.Crustal heterogeneity and seismotectonicsof the region around Beijing China[J].Tectonophysics,2004,385(1-4):159-180.
[17]张成科,张先康,赵金仁,等.渤海湾及其邻区壳幔速度结构研究与综述[J].地震学报,2002,24(4):428-435.Zhang C K,Zhang X K,Zhao J R,et al.Study and reviewon crust-mantle velocity structure in Bohai bay and itsadjacent areas[J].Acta Seismologica Sinica(in Chinese),2002,24(4):428-435.
[18]孙若昧,赵燕来,梅世蓉.渤海及其邻区的地震层析成像[J].地球物理学报,1993,36(1):44-54.Sun R M,Zhao Y L,Mei S R.Seismic tomographic image inBohai sea and its adjacent area[J].Chinese J.Geophys.(inChinese),1993,36(1):44-54.
[19]李志伟,胥颐,郝天珧,等.环渤海地区的地震层析成像与地壳上地幔结构[J].地球物理学报,2006,49(3):797-804.Li Z W,Xu Y,Hao T Y,et al.Seismic tomography andvelocity structure in the crust and upper mantle around BohaiSea area[J].Chinese J.Geophys.(in Chinese),2006,49(3):797-804.
[20]张岭,刘劲松,郝天珧.利用Ground-Truth资料和MessyGA方法反演渤海湾盆地及其邻区地壳P波速度模型[J].地球物理学进展,2005,20(1):186-179.Zhang L,Liu J S,Hao T Y.Inverse crustal P-wave velocitymodel of Bohai bay basin and its adjacent area by using messyGA with Ground-Truth data[J].Progress in Geophysics(inChinese),2005,20(1):186-179.
[21]嘉世旭,张先康,方盛明.华北裂陷盆地不同块体地壳结构及演化研究[J].地学前缘,2001,8(2):259-266.Jia S X,Zhang X K,Fang S M.Research on the crustalstructure and evolution of different blocks in North China rift-depression basin[J].Earth Science Frontiers(in Chinese),2001,8(2):259-266.
[22]嘉世旭,张先康.华北不同构造块体地壳结构及其对比研究[J].地球物理学报,2005,48(3):611-620.Jia S X,Zhang X K.Crustal structure and comparison ofdifferent tectonic blocks in North China[J].Chinese J.Geophys.(in Chinese),2005,48(3):611-620.
[23]郝天珧,刘伊克,段昶.根据重、磁资料探讨中国东部及其邻域断裂体系[J].地球物理学报,1996,39(增刊):141-149.Hao T Y,Liu Y K,Duan C.Approaching fault system of theEast China and adjacent area from gravity and magnetic data[J].Chinese J.Geophys.(in Chinese),1996,39(Supp.):141-149.
[24]江为为.调和级数法与重力资料反演地壳构造[J].科大研究生院学报,1989,6(1):96-104.Jiang W W.The harmonious series and gravitational dataused to inverse crustal structure[J].Journal of GraduateSchool,University of Science and Technology of China(inChinese),1989,6(1):96-104.
[2]刘光鼎.中国海区及邻域地质地球物理特征[M].北京:科学出版社,1992.Liu G D.Geology and Geophysics Characters of China Sea andAdjacent Regions(in Chinese)[M].Beijing:Science Press,1992.
[3]周立宏,李三忠,刘建忠,等.渤海湾盆地区前第三系构造演化与潜山油气成藏模式[M].北京:中国科学技术出版社,2003.Zhou L H,Li S Z,Liu J Z,et al.Pre-Tertiary TectonicEvolution and Buried Hill-Type Oil-Gas Development andReservation Under the Bohai Bay Basin(in Chinese)[M].Beijing:China Science&Technology Press,2003.
[4]徐亚,郝天珧,戴明刚,等.渤海残留盆地分布综合地球物理研究[J].地球物理学报,2007,50(3):868-881.Xu Y,Hao T Y,Dai M G,et al.Integrated geophysicsresearch on distribution of residual basins of Bohai Sea[J].Chinese J.Geophys.(in Chinese),2007,50(3):868-881.
[5]郝天珧,杨长春,刘洪,等.环渤海地区前新生代油气资源的综合地质、地球物理研究[J].地球物理学进展,2007,22(4):1267-1279.Hao T Y,Yang C C,Liu H,et al.Integrated geological andgeophysical study for pre-cenozoic hydrocarbon resources inthe circum-bohai area[J].Progress in Geophysics(inChinese),2007,22(4):1267-1279.
[6]吉治平.渤海残留盆地油气地球物理研究综述[J].地球物理学进展,2005,20(4):1039-1046.Ji Z P.A review of progress on geophysics of Bohai residualbasin[J].Progress in Geophysics(in Chinese),2005,20(4):1039-1046.
[7]卢造勋,蒋秀琴,白云,等.胶辽渤海地区地壳上地幔结构特征与介质的横向非均匀性[J].华北地震科学,1999,17(2):43-51.Lu Z X,Jiang X Q,Bai Y,et al.Structural characteristics ofcrust and upper mantle and inhomogeneity of the medium inJiaoliao and Bohai regions[J].North China EarthquakeSciences(in Chinese),1999,17(2):43-51.
[8]周斌,张英凯,李继训.渤海及邻区地震地质、地球物理场和地震活动特征[J].西北地震学报,2000,22(3):333-337.Zhou B,Zhang Y K,Li J X.Characteristics of geology,geophysical field and seismic activity of Bohai sea and itsvicinity[J].Northwestern Seismological Journal(in Chinese),2000,22(3):333-337.
[9]邱楠生,魏刚,李翠翠,等.渤海海域现今地温场分布特征[J].石油与天然气地质,2009,30(4):412-419.Qiu N S,Wei G,Li C C,et al.Distribution features ofcurrent geothermal field in the Bohai Sea waters[J].Oil&Gas Geology(in Chinese),2009,30(4):412-419.
[10]肖卫勇,王良书,李华,等.渤海盆地地温场研究[J].中国海上油气(地质),2001,15(2):105-110.Xiao W Y,Wang L S,Li H,et al.Geotemperature field inBohai sea[J].China Offshore Oil and Gas(Geology)(inChinese),2001,15(2):105-110.
[11]王良书,刘绍文,肖卫勇,等.渤海盆地大地热流分布特征[J].科学通报,2002,47(2):151-155.Wang L S,Liu S W,Xiao W Y,et al.Distribution featuresof heat flow in Bohai basin[J].Chinese Science Bulletin(inChinese),2002,47(2):151-155.
[12]胡圣标,张容燕,罗毓晖,等.渤海盆地热历史及构造-热演化特征[J].地球物理学报,1999,42(6):748-755.Hu S B,Zhang R Y,Luo Y H,et al.Thermal history andtectonic-thermal evolution of Bohai basin,East China[J].Chinese J.Geophys.(in Chinese),1999,42(6):748-755.
[13]金安蜀,刘福田,孙永智.北京地区地壳和上地幔的三维P波速度结构[J].地球物理学报,1980,23(2):172-182.Jin A S,Liu F T,Sun Y Z.Three-Dimensional P velocitystructure of the crust and upper mantle under Beijing region[J].Chinese J.Geophys.(in Chinese),1980,23(2):172-182.
[14]朱露培,曾融生,刘福田.京津唐张地区地壳上地幔三维P波速度结构[J].地球物理学报,1990,33(3):267-277.Zhu L P,Zeng R S,Liu F T.Three-Dimensional P velocitystructure under the Beijing network area[J].Chinese J.Geophys.(in Chinese),1990,33(3):267-277.
[15]于湘伟,陈运泰,王培德.京津唐地区中上地壳三维P波速度结构[J].地震学报,2003,25(1):1-14.Yu X W,Chen Y T,Wang P D.Three-Dimensional P wavevelocity structure in Beijing-Tianjin-Tangshan area[J].ActaSeismologica Sinica(in Chinese),2003,25(1):1-14.
[16]Huang J L,Zhao D P.Crustal heterogeneity and seismotectonicsof the region around Beijing China[J].Tectonophysics,2004,385(1-4):159-180.
[17]张成科,张先康,赵金仁,等.渤海湾及其邻区壳幔速度结构研究与综述[J].地震学报,2002,24(4):428-435.Zhang C K,Zhang X K,Zhao J R,et al.Study and reviewon crust-mantle velocity structure in Bohai bay and itsadjacent areas[J].Acta Seismologica Sinica(in Chinese),2002,24(4):428-435.
[18]孙若昧,赵燕来,梅世蓉.渤海及其邻区的地震层析成像[J].地球物理学报,1993,36(1):44-54.Sun R M,Zhao Y L,Mei S R.Seismic tomographic image inBohai sea and its adjacent area[J].Chinese J.Geophys.(inChinese),1993,36(1):44-54.
[19]李志伟,胥颐,郝天珧,等.环渤海地区的地震层析成像与地壳上地幔结构[J].地球物理学报,2006,49(3):797-804.Li Z W,Xu Y,Hao T Y,et al.Seismic tomography andvelocity structure in the crust and upper mantle around BohaiSea area[J].Chinese J.Geophys.(in Chinese),2006,49(3):797-804.
[20]张岭,刘劲松,郝天珧.利用Ground-Truth资料和MessyGA方法反演渤海湾盆地及其邻区地壳P波速度模型[J].地球物理学进展,2005,20(1):186-179.Zhang L,Liu J S,Hao T Y.Inverse crustal P-wave velocitymodel of Bohai bay basin and its adjacent area by using messyGA with Ground-Truth data[J].Progress in Geophysics(inChinese),2005,20(1):186-179.
[21]嘉世旭,张先康,方盛明.华北裂陷盆地不同块体地壳结构及演化研究[J].地学前缘,2001,8(2):259-266.Jia S X,Zhang X K,Fang S M.Research on the crustalstructure and evolution of different blocks in North China rift-depression basin[J].Earth Science Frontiers(in Chinese),2001,8(2):259-266.
[22]嘉世旭,张先康.华北不同构造块体地壳结构及其对比研究[J].地球物理学报,2005,48(3):611-620.Jia S X,Zhang X K.Crustal structure and comparison ofdifferent tectonic blocks in North China[J].Chinese J.Geophys.(in Chinese),2005,48(3):611-620.
[23]郝天珧,刘伊克,段昶.根据重、磁资料探讨中国东部及其邻域断裂体系[J].地球物理学报,1996,39(增刊):141-149.Hao T Y,Liu Y K,Duan C.Approaching fault system of theEast China and adjacent area from gravity and magnetic data[J].Chinese J.Geophys.(in Chinese),1996,39(Supp.):141-149.
[24]江为为.调和级数法与重力资料反演地壳构造[J].科大研究生院学报,1989,6(1):96-104.Jiang W W.The harmonious series and gravitational dataused to inverse crustal structure[J].Journal of GraduateSchool,University of Science and Technology of China(inChinese),1989,6(1):96-104.
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