内蒙古二连盆地深层地球物理特征和上古生界的地质结构
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摘要
二连盆地上古生界经历海西、印支、燕山等多期构造改造,现今残存泥盆系、石炭系、二叠系等,其分布主要受区域深部大断裂的控制。针对上古生界重新处理地震资料,提高深层信噪比,增强深层反射能量,地震反射特征较为清晰;对重力资料联片处理,整体研究区域地质特征,采用小子域滤波和图像增强处理,准确确定深大断裂的位置。综合地球物理资料、地质调查资料,认为二连盆地发育近东西向、北东向5条深大断裂,发育规模大、活动时间长,对二连盆地不同时期大地构造演化、沉积建造、岩浆活动、变质作用等起明显的控制作用。地震资料显示,上古生界在二连盆地发育较普遍,经长期褶皱隆起剥蚀,总体表现为西部剥蚀较严重,东部残留厚度较大;泥盆系主要分布于贺根山断裂北部,南部缺失;石炭系、二叠系在盆地内分布广泛,东部和北部厚度大,其它地区局部残留,厚度差异较大,最大厚度近万米。
The Neopaleozonic of Erlian basin is rebuilt by polyphase tectonic movements,such as Hercynian,Indo-Chinese epoch,Yanshanian.It remains many series of strata(Devonian,Carboniferous,Permian etc) now,which distributions are controlled by regional deep structures.Aiming at rehandling the seismic data of Neopaleozonic,we can improve the deep S/N ratio,enhance deep energy reflection,so that the seismic reflection features are more clearly.We can determine the location of deep structures accurately through carry on the gravity data overlapping process,research regional geological characteristics integrally,use small subfield filtering methods and image enhancement technology.Integrated geophysical data and the geological survey data,we think the Erlian basin grow five deep structures of EW-NE,which have controlled clearly the geostructure evolution,the sedimentary formation,the magmatic activity,the metamorphism function,because they have a wide-scale growth and move for a long time.It's displayed by seismic data that the Neopaleozonic of Erlian basin grows generally through long-term drape uplift and erosion,there is a more serious erosion at west,a considerable remnants thickness at east in all.The Devonian distributes primarily at north of Hegen mountain structures while missed at south,Carboniferous and Permian distribute widely throughout the basin,which have a large thickness at east and north,and in other zones,they have a thickness diversity of local residue which the maximum closes to 10000 meters.
The Neopaleozonic of Erlian basin is rebuilt by polyphase tectonic movements,such as Hercynian,Indo-Chinese epoch,Yanshanian.It remains many series of strata(Devonian,Carboniferous,Permian etc) now,which distributions are controlled by regional deep structures.Aiming at rehandling the seismic data of Neopaleozonic,we can improve the deep S/N ratio,enhance deep energy reflection,so that the seismic reflection features are more clearly.We can determine the location of deep structures accurately through carry on the gravity data overlapping process,research regional geological characteristics integrally,use small subfield filtering methods and image enhancement technology.Integrated geophysical data and the geological survey data,we think the Erlian basin grow five deep structures of EW-NE,which have controlled clearly the geostructure evolution,the sedimentary formation,the magmatic activity,the metamorphism function,because they have a wide-scale growth and move for a long time.It's displayed by seismic data that the Neopaleozonic of Erlian basin grows generally through long-term drape uplift and erosion,there is a more serious erosion at west,a considerable remnants thickness at east in all.The Devonian distributes primarily at north of Hegen mountain structures while missed at south,Carboniferous and Permian distribute widely throughout the basin,which have a large thickness at east and north,and in other zones,they have a thickness diversity of local residue which the maximum closes to 10000 meters.
引文
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[19]曹从周,杨芳林,田昌烈,等.内蒙古贺根山地区蛇绿岩及中期板块西伯利亚板块之缝合带位置[C]//沈阳地质矿产研究所.中国北方板块构造论文集.北京:地质出版社,1986:64-86.
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[2]张兴洲,周建波,迟效国,等.东北地区晚古生代构造-沉积特征与油气资源[J].吉林大学学报,2008,38(5):719-725.
[3]葛肖虹,任收麦,刘永江,等.中国大型走滑断裂的复位研究与油气资源战略选区预测[J].地质通报,2006,25(9/10):1022-1027.
[4]Chen Z G,Zhang L C,Wu H Y,et al.Ar-Ar age,geochemistry andpetrogenesis of Late Mesozoic volcanic rocks in the northern marginalregion of Erlian basin,Inner-Mongolia[J].Acta Petrologica Sinica,2009,25(2):297.
[5]卢进才,魏仙样,魏建设,等.内蒙古西部额济纳旗及其邻区石炭系-二叠系油气地质条件初探[J].地质通报,2010,29(2/3):330-340.
[6]于英太.二连盆地演化特征及油气分布[J].石油学报,1990,11(3):12-20.
[7]王瑜.中国东部内蒙古-燕山造山带晚古生代晚期—中生代的造山作用过程[M].北京:地质出版社,1996.
[8]周安朝.华北地块北缘晚古生代盆地演化及盆地耦合关系[M].北京:煤炭工业出版社,2002.
[9]王成文,金巍,张兴洲,等.东北及邻区晚古生代大地构造属性新认识[J].地层学杂志,2008,32(2):119-136.
[10]赵贤正,金凤鸣,赵志刚,等.二连盆地基底石炭系碳酸盐岩油藏的发现及地质特征[J].海相油气地质,2008,13(4):12-18.
[11]刘元龙,郑建昌.用重、磁、地震及地质资料研究深部构造及其地质意义[C]//1993年中国地球物理学会第九届学术年会论文集.北京:地质出版社,1993.
[12]杨高印.位场数据处理的一项新技术——小子域滤波法[J].石油地球物理勘探,1995,30(2):240-244.
[13]张凤旭,张凤琴,刘财,等.断裂构造精细解释技术——三方向小子域滤波[J].地球物理学报,2007,(5):1543-1550.
[14]周能丰,李青.振幅补偿与保幅处理探讨[J].小型油气藏,2005,10(4):23-25.
[15]刘建明,张锐,张庆洲.大兴安岭地区的区域成矿特征[J].地学前缘,2004,11(1):269-277.
[16]王荃.内蒙古中部中朝与西伯利亚古板块间缝合线的确定[J].地质学报,1986,(1):31-41.
[17]王玉净,樊志勇.内蒙古西拉木伦河北部蛇绿岩带中二叠纪放射虫的发现及其地质意义[J].古生物学报,1997,36(1):58-69.
[18]张德润,徐昆,眭素文.西拉木伦河深断裂地球物理场特征及地质作用问题的探讨[C]//1997年中国地球物理学会第十三届学术年会论文集.上海:同济大学出版社,1997.
[19]曹从周,杨芳林,田昌烈,等.内蒙古贺根山地区蛇绿岩及中期板块西伯利亚板块之缝合带位置[C]//沈阳地质矿产研究所.中国北方板块构造论文集.北京:地质出版社,1986:64-86.
[20]李莉,谷峰.内蒙-吉林亚区早二叠世早期的沉积特征及古地理轮廓[J].中国地质科学院院报,1984,8:107-121.
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