陆相前陆盆地层序结构特征研究——以准噶尔南缘晚期前陆盆地为例
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摘要
陆相前陆盆地层序地层学是目前层序地层学的一个重要研究领域和方向。准噶尔南缘为一两期叠加的复合再生型前陆盆地,综合地震、测井、钻井、露头资料对晚期前陆层序进行了划分,共划分出1个一级层序,3个二级层序,5个三级层序以及15个四级层序。依据前陆盆地构造-沉积演化的旋回性及层序的内部发育特征,将各个二级层序划分出4个体系域。建立了准南前陆盆地层序地层模式,探讨了构造活动的层序地层响应。构造活动控制层序界面的形成,一次逆冲末期的回弹隆升和下一次逆冲引起的变形是形成构造层序界面的主要原因。随着造山带前缘推覆的不断向前发展,前陆盆地的沉降中心和沉积中心向斜坡带方向迁移。构造层序的发育具有旋回性和阶段性,每一层序始于沉降速率迅速加快。
The sequence stratigraphy of continental foreland basins is an important domain in current research.The southern Junggar basin is a regenerated compound foreland basin resulted from two-phase superimposition.The sequences of the late phase foreland basin can be divided into 1 first-order sequence,3 second-order sequences,5 third-order sequences and 15 fourth-order sequences in accordance with analyses results of outcrops,cores,seismic data,and well logs.Four systems tracts are recognized in each second-order sequences based on the cyclicity of tectonic and sedimentary evolution and the internal architectures of the sequences.The sequence stratigraphic model of southern Junggar foreland basin is established and sequence-stratigraphic responses to tectonics are discussed in this paper.Tectonic activity controls the formation of sequence boundary,which is formed mainly by the resilient uplift at the end of a thrusting and the deformation caused by the following thrusting.With continuous advancement of the orogenic belt front,the center of subsidence and depocenter of the foreland basin migrate toward the ramp region.The tectonic sequences are developed cyclically and periodically,and each sequence begins with a speeding up of subsidence.
The sequence stratigraphy of continental foreland basins is an important domain in current research.The southern Junggar basin is a regenerated compound foreland basin resulted from two-phase superimposition.The sequences of the late phase foreland basin can be divided into 1 first-order sequence,3 second-order sequences,5 third-order sequences and 15 fourth-order sequences in accordance with analyses results of outcrops,cores,seismic data,and well logs.Four systems tracts are recognized in each second-order sequences based on the cyclicity of tectonic and sedimentary evolution and the internal architectures of the sequences.The sequence stratigraphic model of southern Junggar foreland basin is established and sequence-stratigraphic responses to tectonics are discussed in this paper.Tectonic activity controls the formation of sequence boundary,which is formed mainly by the resilient uplift at the end of a thrusting and the deformation caused by the following thrusting.With continuous advancement of the orogenic belt front,the center of subsidence and depocenter of the foreland basin migrate toward the ramp region.The tectonic sequences are developed cyclically and periodically,and each sequence begins with a speeding up of subsidence.
引文
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2李勇,曾允孚.龙门山前陆盆地充填序列[J].成都理工学院学报,1994,21(3):46~55
3赵玉光,许效松,刘宝,等.克拉通边缘前陆盆地动力层序地层学[J].岩相古地理,1997,17(1):1~10
4付清平.陆相前陆盆地层序地层学研究——以塔里木盆地北部下白垩统地层为例[J].岩相古地理,1997,17(2):1~3
5刘贻军.前陆盆地层序地层学研究中的几个问题[J].地球学报,1998,19(1):90~96
6吴因业,邹才能,季汉成.中国层序地层学导论[M].北京:石油工业出版社,2005
7李德生.中国石油地质学的创新之路[J].石油与天然气地质,2007,28(1):1~11
8黄建军,纪友亮,王改卫,等.东濮凹陷古近系含盐地层层序特征及成因分析[J].石油与天然气地质,2007,28(4):479~484
9李丕龙.塔里木盆地中央隆起带油气突破领域与勘探方向[J].石油与天然气地质,2007,28(5):576~583,589
10赵白.准噶尔盆地的形成和演化[J].新疆石油地质,1992,13(2):191~196
11王宜林,张义杰,王国辉,等.准噶尔盆地油气勘探开发成果及前景[J].新疆石油地质,2002,20(6):148~150
12陈新,卢华福,舒良树,等.准噶尔盆地构造演化分析新进展[J].高校地质学报,2002,8(3):257~266
13况军,贾希玉.喜马拉雅运动与准噶尔盆地南缘油气成藏[J].新疆石油地质,2005,26(2):129~133
14李忠权,张寿庭,王洪辉,等.准噶尔盆地南缘构造成因机理及其与油气聚集关系探讨[J].成都理工学院学报,1997,24(2):15~19
15衣怀峰,吴孔友,曲江秀.准噶尔盆地莫索湾地区构造特征及其演化[J].油气地质与采收率,2005,12(4):1~316万里皋,刘登明,候六根.准噶尔盆地南缘前陆冲断带构造特征研究[J].石油地球物理勘探,2005,40(增刊):40~41
17张立强,罗晓容,刘搂军,等.准噶尔盆地南缘新生界粘土矿物分布及影响因素[J].地质科学,2005,40(3):363~375
18杨藩,唐文松,魏景明,等.中国油气区第三系(Ⅱ)西北油气区分册[M].北京:石油工业出版社,1994
19贾承造,何登发,陆洁民.中国喜马拉雅运动的期次及其动力学背景[J].石油与天然气地质,2004,25(2):121~122
20胡受权,郭文平,杨凤根,等.试论控制断陷湖盆陆相层序地层发育的影响因素[J].沉积学报,2001,19(2):256~262
21郑荣才,彭军,吴朝荣.陆相盆地基准面旋回的级次划分和研究意义[J].沉积学报,2001,19(2):249~255
22王家豪,陈红汉,王华,等.前陆盆地二级层序内可容纳空间发育演化及三级层序对比[J].地球科学———中国地质大学学报,2005,30(2):141~142
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