Characteristics and dynamic background of pre-existing fractures in pre-Cenozoic of Pearl River Mouth Basin: cases of Huizhou Sag and Panyu 4 Depression
-
摘要:
前人针对珠江口盆地前新生代开展过大量研究,但对盆地的原始构造格局仍缺乏统一认识。在高精度三维地震资料的基础上,笔者采用“定性+定量”先存断裂综合识别技术,识别出珠江口盆地惠州凹陷和番禺4洼前新生代基底发育的先存断裂583条。按照断裂是否断穿Tg和断裂倾角大小,将先存断裂分为4类:高角度节理、低角度节理、高角度活化断层和低角度活化断层;按断裂走向划分,将先存断裂分为NW-NWW向和NE-NEE向2组。燕山期晚侏罗—早白垩世,古太平洋板块对华南板块沿NW向正向俯冲,形成NE-NEE向逆冲断裂;燕山期晚白垩世,古太平洋板块对华南板块斜向俯冲产生左旋挤压应力场导致NW-NWW向逆冲断裂形成。这些先存断裂从源头上控制了珠江口盆地的构造格局,为研究盆地后续演化提供了重要支撑。
Abstract:Although previous many studies on the pre-Cenozoic stratigraphy of the Pearl River Mouth Basin have been done, there is still a lack of unified understanding of the original structural pattern of the basin. With available high-precision 3D seismic data, we implemented “qualitative + quantitative” comprehensive identification technology for the recognition of pre-existing fractures, by which 583 pre-existing fractures in the pre-Cenozoic basement of Huizhou Sag and Panyu 4 Depression in the Pearl River Mouth Basin were identified at the end. According to whether the fault runs through reflector Tg (the seismic horizon at the basement) and the fault dip angle, we divided the pre-existing fracture into four types: high-angle joint, low-angle joint, high-angle re-active fault, and low-angle re-active fault. In addition, according to the fractures’ strike, we classified the pre-existing fractures into two groups: NW-NWW and NE-NEE. From the Late Jurassic to Early Cretaceous, the paleo-Pacific Plate subducted into the South China Plate perpendicularly in NW direction and formed NE-NEE thrust faults; in the Late Cretaceous, the paleo-Pacific Plate subducted into the South China Plate obliquely and produced a sinistral compressive stress field, resulting in the formation of NW-NWW thrust faults. These pre-existing fractures control the overall structural pattern of the Pearl River Mouth Basin, and provide an important support to the future study on the subsequent evolution of the basin.
-
[1] 杨堂荣. 珠江口盆地基底构造的形成和发展及其油气勘探前景[J]. 地质科学译从,1989,4(1):40.
[2] 孙晓猛,张旭庆,张功成,等. 南海北部新生代盆地基底结构及构造属性[J]. 中国科学(D辑:地球科学),2014,44(6):1312-1323.
[3] 叶青. 南海北部陆缘晚中生代构造体系: 动力学以及对珠江口盆地新生代构造的制约[D]. 武汉: 中国地质大学, 2019: 38-48.
[4] 鲁宝亮,王璞珺,张功成,等. 南海区域断裂特征及其基底构造格局[J]. 地球物理学进展,2015,30(4):1544-1553. doi: 10.6038/pg20150408
[5] 陈汉宗,吴湘杰,周蒂,等. 珠江口盆地中新生代主要断裂特征和动力背景分析[J]. 热带海洋学报,2005,24(2):52-61. doi: 10.3969/j.issn.1009-5470.2005.02.007
[6] 李平鲁, 王维平, 贺亚纯, 等. 珠江口盆地断裂构造及盆地演化[R]. 广州: 中国海洋石油总公司南海东部公司, 1986: 7-24.
[7] 陈长民, 施和生, 许仕策, 等. 珠江口盆地(东部)第三系油气藏形成条件[M]. 北京: 科学出版社, 2003: 105-110.
[8] 张向涛, 张振波, 张青林, 等. 南海北部中生界残留盆地特征及油气潜力[R]. 广州: 中海石油(中国)有限公司深圳分公司, 2015: 238-241.
[9] 庞雄, 袁立忠, 郑金云, 等. 南海东北部超深水区洋陆转换带盆地形成与演化[R]. 广州: 中海石油(中国)有限公司深圳分公司, 2015: 25-26.
[10] HALL R. Cenozoic geological and plate tectonic evolution of SE Asia and the SW Pacific:computer-based reconstructions,model and animations[J]. Journal of Asian Earth Sciences,2002,20(4):353-431. doi: 10.1016/S1367-9120(01)00069-4
[11] 田立新,刘杰,张向涛,等. 珠江口盆地惠州26-6大中型泛潜山油气田勘探发现及成藏模式[J]. 中国海上油气,2020,32(4):1-11.
[12] 张丽丽,舒梁锋,冯轩,等. 再论珠江口盆地恩平组时代归属[J]. 中国海上油气,2020,32(5):9-18.
[13] 陈安泽, 浦庆余. 黄山花岗岩地貌景观研究[M]. 北京: 科学出版社, 2013: 1-140.
[14] 崔之久,陈艺鑫,杨晓燕. 黄山花岗岩地貌特征、分布与演化模式[J]. 科学通报,2009,54(21):3364-3373.
[15] WU L L,MEI L F,PATON D A,et al. Basement Structures Have Crucial Influence on Rift development:insights From the Jianghan Basin,Central China[J]. Tectonics,2020,39(2):1-21.
[16] 鲁宝亮,孙晓猛,张功成,等. 南海北部盆地基底岩性地震重磁响应特征与识别[J]. 地球物理学报,2011,54(2):563-572. doi: 10.3969/j.issn.0001-5733.2011.02.036
[17] 刘海伦. 珠江口盆地珠一坳陷裂陷结构: 基底属性与区域应力联合制约[D]. 武汉: 中国地质大学, 2018: 35-58.
[18] 袁奎荣. 花岗岩体中断裂构造的初步研究[J]. 桂林冶金地质学院学报,1982,2:1-10.
[19] YE Q,MEI L F,SHI H S,et al. The Late Cretaceous tectonic evolution of the South China Sea area:an overview,and new perspectives from 3D seismic reflection data[J]. Earth-Science Reviews,2018,187:186-204. doi: 10.1016/j.earscirev.2018.09.013
[20] 万天丰. 中国东部中、新生代板内变形构造应力场及其应用[M]. 北京: 地质出版社, 1993: 12-69.
[21] 周蒂,陈汉宗,吴世敏,等. 南海的右行陆缘裂解成因[J]. 地质学报,2002,76(2):181-190.
[22] YUI T F,MAKI K,LAN C Y,et al. Detrital zircons from the Tananao metamorphic complex of Taiwan:implications for sediment provenance and Mesozoic tectonics[J]. Tectonophysics,2012,541/543:31-42. doi: 10.1016/j.tecto.2012.03.013
[23] WAKITA K,METCALFE I. Ocean plate stratigraphy in East and Southeast Asia[J]. Journal of Asian Earth Sciences,2005,24(6):679-702. doi: 10.1016/j.jseaes.2004.04.004
[24] MORLEY C K. Late Cretaceous-Early Palaeogene tectonic development of SE Asia[J]. Earth-Science Reviews,2012,115(1/2):37-75. doi: 10.1016/j.earscirev.2012.08.002