西湖凹陷中北段花港期构造数值模拟及物源意义
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摘要
在区域研究的基础之上,根据平衡剖面恢复的运动学参数,利用构造应力数值模拟技术,对渐新世花港期西湖凹陷中北段和东部的构造变形与物源进行了研究。结果表明:西湖凹陷东西向挤压在中新世玉泉期最为强烈,其次为花港期;花港期,由南向北水平缩短率逐渐变大。福江凹陷在花港期存在巨大基底裸露区,为西湖凹陷渐新统花港组的沉积提供了充足的物源。钓鱼岛隆褶带之上广泛发育花港组,厚度从南向北逐渐减薄,地质趋势法恢复的北部剥蚀厚度达1 700m。花港期冲绳海槽还未形成,钓鱼岛隆褶带与东海陆架外缘隆起连在一起,接受来自东侧的物源供给。数值模拟结果为西湖凹陷北侧、东侧物源的存在提供了构造变形的理论基础,阐明了西湖凹陷花港组内发育以轴向水系为主,多向物源供给的构造背景。
Based on regional geological research,by means of the kinematics parameters extracted from balanced sections and tectonic stress simulation,tectonic deformation and depositional provenances of the Huagang Period in the middle-north and east parts of the Xihu Sag are studied in this paper.The results demonstrate that the EW compression was the strongest in the Yuquan period of Miocene in the Xihu Sag,followed by the Huagang period of Oligocene.The horizontal shortening rate gradually increased from south to north during the Huagang period.There was a huge exposed basement area in the Fujiang Sag,which provided enormous sediments to the Xihu Sag.The Huagang Formation is widely distributed in the Diaoyu Islands folded-uplift belt.Its thickness gradually decreased from south to north,and the denudation thickness,recovered by the geological trend method,reached1 700 min the north.Up to the Huagang period,the Okinawa Trough has not yet formed.The Diaoyu Island uplift belt was thus directly next to the outer uplift of the East China Sea Shelf and received sediment supplies from the east.The numerical simulation results provided a tectonic basis for recognizing the provenances on the north and east sides of Xihu Sag.Axial drainage systems of multiple provenances dominated the Xihu Sag during the period of Huagang Formation.
Based on regional geological research,by means of the kinematics parameters extracted from balanced sections and tectonic stress simulation,tectonic deformation and depositional provenances of the Huagang Period in the middle-north and east parts of the Xihu Sag are studied in this paper.The results demonstrate that the EW compression was the strongest in the Yuquan period of Miocene in the Xihu Sag,followed by the Huagang period of Oligocene.The horizontal shortening rate gradually increased from south to north during the Huagang period.There was a huge exposed basement area in the Fujiang Sag,which provided enormous sediments to the Xihu Sag.The Huagang Formation is widely distributed in the Diaoyu Islands folded-uplift belt.Its thickness gradually decreased from south to north,and the denudation thickness,recovered by the geological trend method,reached1 700 min the north.Up to the Huagang period,the Okinawa Trough has not yet formed.The Diaoyu Island uplift belt was thus directly next to the outer uplift of the East China Sea Shelf and received sediment supplies from the east.The numerical simulation results provided a tectonic basis for recognizing the provenances on the north and east sides of Xihu Sag.Axial drainage systems of multiple provenances dominated the Xihu Sag during the period of Huagang Formation.
引文
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[17]郭真,刘池洋,田建锋.东海盆地西湖凹陷反转构造特征及其形成的动力环境[J].地学前缘,2015,22(3):59-67.
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[19]Cukur D,Horozal S,Kim D C,et al.Seismic stratigraphy and structural analysis of the northern East China Sea Shelf Basin interpreted from multi-channel seismic reflection data and cross-section restoration[J].Marine and Petroleum Geology,2011,28(5):1003-1022.
[20]Lee G H,Kim B Y,Shin K S,et al.Geologic evolution and aspects of the petroleum geology of the northern East China Sea shelf basin[J].AAPG Bulletin,2006,90(2):237-260.
[21]王子煜,张明利.东海西湖凹陷新生界主要不整合面地层剥蚀厚度恢复[J].地质论评,2005,51(3):309-318.
[22]郝乐伟,刘畅,王琪,等.西湖凹陷古近系花港组物源区特征分析[J].天然气地球科学,2011,22(2):315-323.
[23]张建培,唐贤君,张田,等.平衡剖面技术在东海西湖凹陷构造演化研究中的应用[J].海洋地质前沿,2012,28(8):31-37.
[24]胡望水,柴浩栋,李瑞升,等.平衡剖面技术对东海西湖凹陷正反转构造及其成藏控制的研究[J].特种油气藏,2010,17(1):15-19,121.
[2]张建培,徐发,钟韬,等.东海陆架盆地西湖凹陷平湖组-花港组层序地层模式及沉积演化[J].海洋地质与第四纪地质,2012,21(1):35-41.
[3]张国华.西湖凹陷高压形成机制及其对油气成藏的影响[J].中国海上油气,2013,25(2):1-8.
[4]赵红格,刘池洋.物源分析方法及研究进展[J].沉积学报,2003,21(3):409-415.
[5]徐亚军,杜远生,杨江海.沉积物物源分析研究进展[J].地质科技情报,2007,114(3):26-32.
[6]杨仁超,李进步,樊爱萍,等.陆源沉积岩物源分析研究进展与发展趋势[J].沉积学报,2013,31(1):99-107.
[7]Busby C,Azor A.Dynamic Relationship between Subsidence,Sedimentation,and Unconformities in Mid-Cretaceous,Shallow-Marine Strata of the Western Canada Foreland Basin:Links to Cordilleran Tectonics[M]∥Tectonics of Sedimentary Basins:Recent Advances.John Wiley&Sons,Ltd.,2012:177-182.
[8]张田,张建培,张绍亮,等.有限元数值模拟技术在西湖凹陷中央反转构造带形成机制研究中的应用[J].海洋石油,2012,32(4):11-16.
[9]Rossland A,Escalona A,Rolfsen R.Permian-Holocene tectonostratigraphic evolution of the Mandal High,Central Graben,North Sea[J].AAPG Bulletin,2013,97(3):923-957.
[10]Lunt I A,Smith G H S,Best J L,et al.Deposits of the sandy braided South Saskatchewan River:Implications for the use of modern analogs in reconstructing channel dimensions in reservoir characterization[J].AAPG Bulletin,2013,97(4):553-576.
[11]Miall A D,The Geology of Stratigraphic Sequences,second edition[M].Berlin:Springer-Verlag,2010:308-325.
[12]刘卫红,林畅松,郭泽清,等.东海陆架盆地西湖凹陷新生代反转构造样式及其形成机制初探[J].地质科学,2009,44(1):74-87.
[13]张建培,张涛,刘景彦,等.西湖凹陷反转构造分布与样式[J].海洋石油,2008,28(4):14-20.
[14]张敏强,徐发,张建培,等.西湖凹陷裂陷期构造样式及其对沉积充填的控制作用[J].海洋地质与第四纪地质,2011,31(5):67-72.
[15]张远兴,叶加仁,苏克露,等.东海西湖凹陷沉降史与构造演化[J].大地构造与成矿学,2009,33(2):215-223.
[16]张绍亮,秦兰芝,余逸凡,等.西湖凹陷渐新统花港组下段沉积相特征及模式[J].石油地质与工程,2014,28(2):5-8,145.
[17]郭真,刘池洋,田建锋.东海盆地西湖凹陷反转构造特征及其形成的动力环境[J].地学前缘,2015,22(3):59-67.
[18]郭真,刘池洋,田建锋.东海陆架盆地龙井运动构造影响及其发育背景[J].西北大学学报(自然科学版),2015,45(5):801-810.
[19]Cukur D,Horozal S,Kim D C,et al.Seismic stratigraphy and structural analysis of the northern East China Sea Shelf Basin interpreted from multi-channel seismic reflection data and cross-section restoration[J].Marine and Petroleum Geology,2011,28(5):1003-1022.
[20]Lee G H,Kim B Y,Shin K S,et al.Geologic evolution and aspects of the petroleum geology of the northern East China Sea shelf basin[J].AAPG Bulletin,2006,90(2):237-260.
[21]王子煜,张明利.东海西湖凹陷新生界主要不整合面地层剥蚀厚度恢复[J].地质论评,2005,51(3):309-318.
[22]郝乐伟,刘畅,王琪,等.西湖凹陷古近系花港组物源区特征分析[J].天然气地球科学,2011,22(2):315-323.
[23]张建培,唐贤君,张田,等.平衡剖面技术在东海西湖凹陷构造演化研究中的应用[J].海洋地质前沿,2012,28(8):31-37.
[24]胡望水,柴浩栋,李瑞升,等.平衡剖面技术对东海西湖凹陷正反转构造及其成藏控制的研究[J].特种油气藏,2010,17(1):15-19,121.
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