1. China University of Geosciences, Beijing 100083,China 2. China Aero Geophysical Survey and Remote Sensing Center for Natural Resources,Beijing 100083, China
The Pearl River Mouth basin is the largest pre-Cenozoic sedimentary basin on the continental slope of the South China Sea. It is rich in oil and gas resources. Due to the lack of new geophysical data, the distribution characteristics of the internal tectonic units in the Pearl River Mouth basin have many different views. This problem has constrained further exploration and development of the basin. This study aims to throw light on the magnetic basement structure of Pearl River Mouth basin based on the latest high resolution aeromagnetic data, combined with drilling data, seismic profiles and basic geological data. Tangent method was used in the inversion. On the basis of fully investigating the existing structural unit division in the Pearl River Mouth basin and in combination with the faults and regional structures, the internal tectonic units were studied. The result shows that the magnetic basement depth of the basin is between 0 and 9 km, and the magnetic basement is characterized by "three uplift and two depressions". The whole depression area has the characteristics of "north-south zoning, east-west sub-block". The NE trending fault is the main fault that controls sedimentary depression, while the NW-trending faults are secondary faults which control depressions.
夏玲燕, 林畅松, 李筱, 胡悦. 基于磁力资料的珠江口盆地构造单元分布特征[J]. 物探与化探, 2019, 43(3): 468-475.
Ling-Yan XIA, Chang-Song LIN, Xiao LI, Yue HU. Distribution characteristics of tectonic units in Pearl River Mouth basin based on magnetic data. Geophysical and Geochemical Exploration, 2019, 43(3): 468-475.
Yao B Ch. The tectonic evolution and sedimentary basins of South China Sea in Cenozoic[C]//Geological research of South China Sea(Memoir 10). Beijing: Geological Publishing House, 1998.
Zhou D, Sun Z . Plate evolution in the Pacific domain since Late Mesozoic and its inspiration to tectonic research of East Asia margin[J]. Journal of Tropical Oceanography, 2017,36(3):1-19.
Chen J J, Ma Y P, Chen J Z , et al. Tectonic dynamics of northern continental margin basins in South China Sea[J]. Earth Science Frontiers, 2015,22(3):38-45.
Li S Z, Suo Y H, Liu X , et al. Basin dynamics snd basin groups of the South China Sea[J]. Marine Geology & Quaternary Geology | Marin Geol Quat Geol, 2012,32(6):55-72.
[6]
Gao J W, Wu S G, Mcintosh K , et al. Crustal structure and extension mode in the northwestern margin of the South China Sea[J]. Geochemistry,Geophysics,Geosystems, 2016: 2143-2163.
doi: 10.1002/2016GC006247
Zhu W L, Mi L J, Gao Y D , et al. The discovery of giant and major fields has given impetus to reaching a new peak in hydrocarbon exploration offshore China : a review of 2012 offshore exploration in China[J]. China Off Shore Oil And Gas, 2013,25(1):6-11.
Zhu W L, Mi L J, Gao L , et al. The innovation in knowledge and techonology has given impetus to reaching a new stage in hydrocarbon exploration offshore China:a review of 2013[J]. China Offshore Oil And Gas, 2014,26(1):1-8.
Pang X, Shi H S, Zhu M , et al. A further discussion on the hydrocarbon exploration potential in Baiyun deep water area[J]. China Offshore Oil And Gas, 2014,26(3):23-28.
Mi L J . Continuous breakthroughs on petroleum exploration of the eastern South China Sea with innovative understanding:review of recent exploration progress[J]. China Offshore Oil And Gas, 2018,30(1):1-9.
Chen B, Wang J L, Zhong Z H , et al. Geophysical study of Pre-Tertiary basin style of Chaoshan sag in South China Sea[J]. Journal Of Tongji University:Natural Science Edition, 2005,33(9):1274-1280.
Li W Z, Wang P J, Zhang G C , et al. Research on time-depth conversion of deep-seated basal strata of Pearl River Mouth Basin[J]. Chinese Journal Of Geophysics, 2011,54(2):449-456.
Wu Zh C, Gao J Y, Zhao L H , et al. Magnetic field of the northern South China Sea: its characteristics and tectonic significance[J]. Journal Of Tropical Oceanography, 2010,29(6):162-169.
Lei W M, Wu J Sh . Inversion and interpretation of magnetic anomalies at northeastern margin basement of the South China Sea[J]. Journal Of Tongji University:Natural Science Edition, 2012,40(11):1725-1728.
Ma J, Wang W Y, Luo X G , et al. The magnetic basement and curie surface depth in the South China Sea and adjacent areas derived from magnetic data[J]. Chinese Journal Of Geophysics, 2018,61(10):4269-4280.
Zhang G C, Jia Q J, Wang W Y , et al. On tectonic framework snd evolution of the South China Sea[J]. Chinese Journal Of Geophysics, 2018,61(10):4194-4215.
Xiong S Q, Ding Y Y, Li Z K , et al. Characteristics of China continent magnetic basement depth[J]. Chinese Journal Of Geophysics, 2015,57(12):3981-3993.
Zhang X H, Han B, Meng X J , et al. Gravity and magnetic field features of East China Sea and their geological significance[J].Mineral Deposits, 32(4):843-853.
[20]
Osinowo O O, Akanji A O, Olayinka A I , et al. Application of high resolution aeromagnetic data for basement topography mapping of Siluko and environs, southwestern Nigeria[J]. Journal of African Earth Sciences, 2014(99):637-651.
doi: 10.1016/j.jafrearsci.2013.11.005
[21]
Tong J, Zhang X J, Zhang W , et al. Marine strata morphology of the South Yellow Sea based on high-resolution aeromagnetic and airborne gravity data[J]. Marine and Petroleum Geology, 2018(96):429-440.
doi: 10.1016/j.marpetgeo.2018.06.018
Wang J L, Zhang X B, Wu J Sh , et al. Integrated geophysical researches on base texture of Pearl River Mouth Basin[J]. Journal Of Tropical Oceanography, 2002,21(2):13-22.
Hu W J, Jiang W W, Hao T Y , et al. Integrated geophysical research on the distribution of Pre-Cenozoic residual basins in the South China Sea[J].Chinese Journal Of Geophysics, 54(12):3315-3324.
Liu H L, Mei L F, Shi H S , et al. Rift style controlled by basement attribute and regional stress in Zhu I depression, Pearl River Mouth Basin[J]. Earth Science , 2018,54(12):3315-3324.
[25]
Xiong S Q, Tong J, Ding Y Y . Aeromagnetic data and geological structure of continental China: A review[J]. Applied Geophysics, 2016,13(2):227-237.
doi: 10.1007/s11770-016-0552-2
Xia L Y, Lin C S, Li X , et al. Characteristics of fault structures in Pearl RIver Mouth Basin and control effect of them on sedimentary basin[J]. Journal Of Xi'An Shiyou University:Natural Science Edition, 2018,33(5) : 1-7.
Shi H S, Dai Y D, Liu L H , et al. Geological characteristics and distribution model of oil and gas reservoirs in Zhu I Depression, Pearl River Mouth Basin[J]. Acta Petrolel Sinica, 2015,36(S2):120-132.
Liu Z F, Wang S L, Ding L , et al. Structural features of the northern depression belt in the Pearl River Mouth Basin[J]. Journal Of Geology , 2016,40(1):136-140.
[31]
刘富强 . 利用卫星重力资料研究珠江口北部边界及构造区划[D]. 西安:长安大学, 2014.
[31]
Liu F Q . Study on the northern border and tectonic division of Pearl River Mouth Basin by using satellite gravity data[D].Chang' An University, 2014.
Feng X L, Zhang G C, Wang W Y , et al. An integrated study on distribution of Cenozoic basins in the South China Sea based on gravity, magnetic and seismic data[J]. Chinese Journal Of Geophysics, 61(10):4242-4254.
Zhang B, Wang P J, Zhang G C , et al. Cenozoic volcanic rocks in the Pearl River Mouth and southeast Hainan Basins of South China Sea and their implications for petroleum geology[J]. Petroleum Exploration And Development, 2013,40(6):657-664.
[34]
Zhao F, Wu S G, Sun Q L , et al. Submarine volcanic mounds in the Pearl River Mouth Basin, northern South China Sea[J]. Marine Geology, 2014,355:162-172.
doi: 10.1016/j.margeo.2014.05.018
Shao L, You H Q, Hao L J , et al. Petrology and depositional environments of Mesozoic strata in the northeastern South China Sea[J]. Geological Review, 2007,53(2):164-169.