利用重力场研究塞萨尔盆地及邻区构造特征
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摘要
为了利用地球物理资料研究塞萨尔盆地及邻区构造特征,系统搜集整理了研究区已有的重力资料。根据布格重力异常,采用最小曲率位场分离方法、归一化总水平导数垂向导数方法(NVDR-THDR)识别出断裂信息,结合地质地球物理资料,重点分析了主要断裂的地质地球物理特征,确定了研究区内的断裂体系。研究发现,研究区内主要发育近EW向、NNW向、NW向和NE向4组断裂,认为Oca走滑断裂向西延伸至海区内,推测了SMB走滑断裂和Algarrobo走滑断裂平面位置;认为不同走向的4组断裂控制了研究区的构造格架,使之整体呈"倒三角"型,"倒三角"内分西、中和东3个构造块体,块体间以断裂为界分别为Santa Marta岩体、塞萨尔盆地和Sierra de Perija山;最后,结合断裂分布、基底特征及前人研究,重新推测了塞萨尔盆地的边界,其边界均受断裂所限,盆地范围向南、向西扩展;盆地内部,断裂F8、F9将盆地划分为北部坳陷、中部隆起和南部坳陷3个次级构造单元。
In order to use the geophysical data to study the structural characteristics of the Cesar Basin and its adjacent areas,this paper has systematically collected and compiled the existing gravity data in the study area.Based on Bouguer gravity anomaly,the paper identifies the fracture information by the minimum curvature field separation method and NVDR-THDR,analyses the geological and geophysical characteristics of major faults and determines the fracture system in the study area by combining with geological geophysical data.In the study area,there are four faults found in the near EW,NNW,NW and NE directions.It is believed that the Oca strike-slip fault extends westward to the sea area,and this extension suggests the position of the SMB strike-slip fault and the Algarrobo strike-slip fault.The four groups of faults control the structural framework of the study area,making it an "inverted triangle" as a whole,while this "inverted triangle" is divided into three structural blocks:West,Middle,and East.The fault boundarybetween blocks is the Santa Marta rock body,the Cesar Basin and the Sierra de Perija Mountain respectively.Finally,the analysis of fault distribution,basement characteristics and previous research further infers the boundary of the Cesar Basin,which is limited by faults,and the Basin extends southwards and westwards.Within the Basin,faults F8 and F9divide the Basin into three sub-tectonic units:the northern depression,the central uplift,and the southern depression.
In order to use the geophysical data to study the structural characteristics of the Cesar Basin and its adjacent areas,this paper has systematically collected and compiled the existing gravity data in the study area.Based on Bouguer gravity anomaly,the paper identifies the fracture information by the minimum curvature field separation method and NVDR-THDR,analyses the geological and geophysical characteristics of major faults and determines the fracture system in the study area by combining with geological geophysical data.In the study area,there are four faults found in the near EW,NNW,NW and NE directions.It is believed that the Oca strike-slip fault extends westward to the sea area,and this extension suggests the position of the SMB strike-slip fault and the Algarrobo strike-slip fault.The four groups of faults control the structural framework of the study area,making it an "inverted triangle" as a whole,while this "inverted triangle" is divided into three structural blocks:West,Middle,and East.The fault boundarybetween blocks is the Santa Marta rock body,the Cesar Basin and the Sierra de Perija Mountain respectively.Finally,the analysis of fault distribution,basement characteristics and previous research further infers the boundary of the Cesar Basin,which is limited by faults,and the Basin extends southwards and westwards.Within the Basin,faults F8 and F9divide the Basin into three sub-tectonic units:the northern depression,the central uplift,and the southern depression.
引文
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[10]Graterol V,Vargas A.Programa adquisicion procesamiento e interpretacion de datos de aeromagneto-gravimetria en Las Cuencas de Cesar Ranchería,Alta y Baja Guajira y Alejo[R].Agencia Nacional de Hidrocarburos,2007.
[11]纪晓琳,王万银,邱之云.最小曲率位场分离方法研究[J].地球物理学报,2015,58(3):1042-1058.
[12]王万银,邱之云,杨永,等.位场边缘识别方法研究进展[J].地球物理学进展,2010,25(1):196-210.
[13]Wang Wanyin,Pan Yu,Qiu Zhiyun.A new edge recognition technology based on the normalized vertical derivative of total horizontal derivative for potential field data[J].Applied Geophysics,2009,6(3):226-233.
[14] Montes C,Bayona G,Jaramillo C,et al.Uplift to the sierra Nevada de Santa Marta and subsidence in the Cesar-Rancheria valley:Rigid-beam pivot model[J].Tetrahedron,2005,63(18):3782-3789.
[15]Escalona A,Mann P.Tectonics,basin subsidence mechanisms,and paleogeography of the Caribbean-South American plate boundary zone[J].Marine and Petroleum Geology,2011,28(1):8-39.
[16]Mann P,Escalona A,Castillo M V.Regional geologic and tectonic setting of the Maracaibo supergiant basin,western Venezuela[J].AAPG Bulletin,2006,90(4):445-477.
[2] Montes C,Guzman G,Bayona G,et al.Clockwise rotation of the Santa Marta massif and simultaneous Paleogene to Neogene deformation of the Palto-San Jorge and Cesar-Rancheria basins[J].Journal of South American Earth Sciences,2010,29(4):832-848.
[3] Barrero D,Pardo A,Carlos A,et al.Colombian sedimentary basin:Nomenclature,Boundaries and petroleum geology,a new proposal[R].Colombia:Agencia Nacional De Hidrocarburos,2007.
[4] Summaa L L,Goodmanb E D,Richardsona M,et al.Hydrocarbon systems of Northeastern Venezuela:Plate through molecular scale-analysis of the genesis and evolution of the Eastern Venezuela Basin[J].Marine and Petroleum Geology,2003,20(3):323-349.
[5]程小岛,李江海,高危言.南美板块北部边界作用对其含油气盆地的影响[J].石油天然气地质,2013,34(1):112-119.
[6] Mejía M B,Tello A N.Mapageológico de Colombia[R].Colombia:Instituto Colombiano de Geologíay Minería Ingeominas,2007.
[7]朱伟林.南美洲含油气盆地[M].北京:科学出版社,2012.
[8] Pindell J,Tabbutt K.Mesozoic-Cenozoic Andean paleogeography and regional controls on hydrocarbon systems[J].Petroleum Basins of South America:AAPG Memoir,1995,62:101-128.
[9] Sanchez J,Mann P.Integrated structural and basinal analysis of the Cesar-Rancheria Basin,Colombia:Implications for it’s tectonic history and petroleum systems[J].Petroleum Geology and Potential of the Colombian Caribbean Margin:AAPG Memoir,2015,108:431-470.
[10]Graterol V,Vargas A.Programa adquisicion procesamiento e interpretacion de datos de aeromagneto-gravimetria en Las Cuencas de Cesar Ranchería,Alta y Baja Guajira y Alejo[R].Agencia Nacional de Hidrocarburos,2007.
[11]纪晓琳,王万银,邱之云.最小曲率位场分离方法研究[J].地球物理学报,2015,58(3):1042-1058.
[12]王万银,邱之云,杨永,等.位场边缘识别方法研究进展[J].地球物理学进展,2010,25(1):196-210.
[13]Wang Wanyin,Pan Yu,Qiu Zhiyun.A new edge recognition technology based on the normalized vertical derivative of total horizontal derivative for potential field data[J].Applied Geophysics,2009,6(3):226-233.
[14] Montes C,Bayona G,Jaramillo C,et al.Uplift to the sierra Nevada de Santa Marta and subsidence in the Cesar-Rancheria valley:Rigid-beam pivot model[J].Tetrahedron,2005,63(18):3782-3789.
[15]Escalona A,Mann P.Tectonics,basin subsidence mechanisms,and paleogeography of the Caribbean-South American plate boundary zone[J].Marine and Petroleum Geology,2011,28(1):8-39.
[16]Mann P,Escalona A,Castillo M V.Regional geologic and tectonic setting of the Maracaibo supergiant basin,western Venezuela[J].AAPG Bulletin,2006,90(4):445-477.