下扬子前陆盆地北部构造变形特征研究
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摘要
下扬子前陆盆地由相向的南北两套前陆变形系统组成。依据西南缘、南缘和东南缘露头,以及地震资料厘定了下扬子前陆盆地北部的断裂系统格局、地层展布及断裂褶皱样式,总结了不同构造单元的变形特征。印支期盆地北部的断裂格局为南北分带、东西分块。北部前陆褶断带中,变形程度由苏鲁造山带和郯庐断裂带向东、南方向逐渐减弱。相应地,由西北向东南方向,地层越来越新,主要构造样式由冲断型向推覆型再到褶皱型转变。下扬子区北部前陆变形系统可以分为根带、中带和对冲锋带。总体上,根带变形强度最强,中带的推覆体上盘次之,对冲锋带和中带的推覆体下盘是相对弱变形区,也是值得重视的油气勘探区。
There are two fold-fault systems in opposite northern-southern direction across lower Yangtze foreland bain.The fault systems,the expanding characteristics of stratum,and the fold-thrust patterns are studied based on outcrops nd seismic sections in northern deformation belt of the basin.The fault framework in indo-Chinese epoch is characterized s north-south dissimilitude and west-east differentiation.The degree of deformation gradually weakens from Lusu oroenic belt and Tanlu thrust fault belt to eastward and southward direction.Accordingly,tectonic patterns are mainly develped as thrust style,nappe style and fold style in order,more and more parts of younger formations spread from west-north o east-south.The northern part of the basin is divided into root zone,middle zone and opposite front zone.In general,the eformation degree of root zone is the strongest,the hanging wall of the nappe in the middle zone take the second place.he opposite front zone and the foot wall of the nappe in the middle zone are relatively weak in deformation,which are faorable exploration area.
There are two fold-fault systems in opposite northern-southern direction across lower Yangtze foreland bain.The fault systems,the expanding characteristics of stratum,and the fold-thrust patterns are studied based on outcrops nd seismic sections in northern deformation belt of the basin.The fault framework in indo-Chinese epoch is characterized s north-south dissimilitude and west-east differentiation.The degree of deformation gradually weakens from Lusu oroenic belt and Tanlu thrust fault belt to eastward and southward direction.Accordingly,tectonic patterns are mainly develped as thrust style,nappe style and fold style in order,more and more parts of younger formations spread from west-north o east-south.The northern part of the basin is divided into root zone,middle zone and opposite front zone.In general,the eformation degree of root zone is the strongest,the hanging wall of the nappe in the middle zone take the second place.he opposite front zone and the foot wall of the nappe in the middle zone are relatively weak in deformation,which are faorable exploration area.
引文
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[21]谈迎,邱旭明,李亚辉,等.下扬子区中、古生界变形结构分区[J].复杂油气藏,2011,4(1):14-18.
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[2]陈沪生.下扬子地区重建型海相烃源油气领域评价及勘探对策[J].海相油气地质,2002,2(2):33-41.
[3]丁道桂,王东燕,刘运黎.下扬子地区古生代盆地的改造变形[J].地学前缘,2009,16(4):61-73.
[4]姚柏平.下扬子区“对冲”构造模式及其意义[R].江苏省构造地质会议,南京:1991.
[5]姚柏平,陆红,郭念发.论下扬子地区多期构造格局叠加及其油气地质意义[J].石油勘探与开发,1999,26(4):10-13.
[6]朱光,徐嘉炜,刘国生,等.下扬子地区前陆变形构造格局及其动力学机制[J].中国区域地质,1999,18(1):73-79.
[7]梅廉夫,戴少武,沈佳波,等.中下扬子区中、新生代陆内对冲带的形成及解体[J].地质科技情报,2008,27(4):1-8.
[8]庄建建,杨风丽,赵文芳.下扬子区印支——早燕山期的构造特征及应力场模拟[J].高校地质学报,2010,16(4):475-481.
[9]杜国云.宁镇山脉汤—仑推覆体前锋带构造型式及形成机制初探[J].大地构造与成矿学,1999,23(1):59-64.
[10]涂荫玖,刘湘培,汪祥云,等.下扬子北缘滁州—巢湖前陆褶皱冲断带研究[J].大地构造与成矿学,2001,25(1):9-26.
[11]邱旭明.下扬子海相中、古生界地质结构特征及选区评价[J].江汉石油学院学报,2001,23(增刊):13-15.
[12]曾萍.G78区域大剖面综合解释及苏北盆地构造特征[J].石油天然气学报,2007,29(3):82-86.
[13]陈刚,史鹏,陈清华,等.连云港—苏州区域大剖面构造特征与变形机制[J].石油天然气学报,2009,31(4):49-53.
[14]丁卫星,赵胜,陆英,等.逆冲推覆带古生界综合解释方法研究——以苏北LTQ三维为例[J].复杂油气藏,2011,4(2):1-4.
[15]邱旭明.下扬子海相地层地震内幕反射的地质成因[J],石油与天然气地质,2011,32(3):397-403.
[16]裴振洪,王果寿.苏北—南黄海海相中古生界构造变形类型划分[J].天然气工业,2003,23(6):32-36.
[17]王巍、陈高、王家林,等.苏北—南黄海盆地区域构造特征分析[J].地震学刊,1999,19(1):47-55.
[18]佘晓宇,徐宏节,何治亮.江苏下扬子区中、古生界构造特征及其演化[J].石油与天然气地质,2004,25(2):226-230.
[19]赵挺,程海生,陆英.下扬子区中、古生界典型构造样式与油气勘探选区[J].复杂油气藏,2010,3(2):8-12.
[20]李亚辉,段宏亮,谈迎.下扬子区海相中、古生界地质结构分区及其油气勘探选区意义[J].地质力学学报,2010,16(3):271-280.
[21]谈迎,邱旭明,李亚辉,等.下扬子区中、古生界变形结构分区[J].复杂油气藏,2011,4(1):14-18.
[22]陆克政,朱筱敏,漆家福.含油气盆地分析[M].北京:中国石油大学出版社,2006:116-117.
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