1.长安大学 重磁方法技术研究所,陕西 西安 710054 2.长安大学 地质工程与测绘学院,陕西 西安 710054 3.长安大学 西部矿产资源与地质工程教育部重点实验室,陕西 西安 710054 4.中国科学院 海洋地质与环境重点实验室,山东 青岛 266071 5.中国科学院海洋研究所,山东 青岛 266071 6.海洋油气勘探国家工程研究中心,北京 100028 7.Department of Earth Sciences, University of Naples Federico II, Naples 80138
A study of tectonic framework of the Qinnan sag in Bohai Basin and its adjacent areas based on satellite gravity anomalies
YANG Rong-Xiang1,2,3(), WANG Wan-Yin1,2,3,4,5,6(), CAI Meng-Ke1,2,3, WANG Ding-Ding1,2,3,7, LUO Xin-Gang1,2,3
1. Institute of Gravity and Magnetic Technology, Chang 'an University, Xi'an 710054, China 2. School of Geological Engineering and Geomatics, Chang'an University, Xi'an 710054, China 3. Key Laboratory of Western China's Mineral Resources and Geological Engineering of Ministry of Education, Chang'an University, Xi'an 710054, China 4. Key Laboratory of Marine Geology & Environment, Chinese Academy of Sciences, Qingdao 266071, China 5. Institute of Oceanology, Chinese Academy of Sciences, Qingdao 266071, China 6. National Engineering Research Center of Offshore Oil and Gas Exploration, Beijing 100028, China 7. Department of Earth Sciences, University of Naples Federico II, Naples 80138, Italy
The Bohai Basin has the most offshore oil and gas fields discovered in China. As a potential hydrocarbon-rich sag in the Bohai Basin, the Qinnan Sag is of high value in exploration. Therefore, the study of the tectonic framework of the sag and its adjacent areas is of great significance and application value. Based on satellite gravity anomalies, this study determined the Bouguer gravity anomalies by correcting the influences of land topography and seawater and obtained the planar distribution and apparent depths of faults, the thickness of Cenozoic strata, and the boundaries of tectonic units using methods such as the normalized vertical derivative of the total horizontal derivative (NVDR-THDR), the Euler deconvolution, the minimum curvature potential field separation, and the fast for the gravity field based in a dual interface model. Based on the geological and geophysical data, this study analyzed the distribution and geophysical characteristics of major faults and tectonic units in the study area. The results of this study are as follows: The faults in the Qinnan Sag and its adjacent areas mainly have NE, NEE, and NW strikes and an apparent depth of primarily 1~10 km, which is up to 15~25 km at some positions of the sag-controlling faults and the intersections of the faults; The Cenozoic strata have a thickness of 0~11 km. The Cenozoic tectonic units are distributed in alternating NE and NEE directions, and their boundaries are mostly controlled by faults; Through further investigation, this study classified the sub-sag on the west side of the Qinnan sag as the Laoting sag and adjusted the boundaries of other tectonic units. The results of this study on the distribution of the faults and tectonic units can provide geophysical data for hydrocarbon exploration in the Qinnan Sag.
杨荣祥, 王万银, 蔡梦轲, 王丁丁, 罗新刚. 基于卫星重力异常的渤海盆地秦南凹陷及邻区构造格局研究[J]. 物探与化探, 2023, 47(3): 584-596.
YANG Rong-Xiang, WANG Wan-Yin, CAI Meng-Ke, WANG Ding-Ding, LUO Xin-Gang. A study of tectonic framework of the Qinnan sag in Bohai Basin and its adjacent areas based on satellite gravity anomalies. Geophysical and Geochemical Exploration, 2023, 47(3): 584-596.
Xia Q L, Xu C G. New geological understandings and major hydrocarbon discoveries in the complex fault zone of Bo-hai Sea[J]. Acta Petrolei Sinica, 2016, 37(S1):22-33.
Wei G, Xue Y A, Chai Y B, et al. Philosophy innovations and a breakthrough in petroleum exploration in Qinnan Sag[J]. China Offshore Oil and Gas, 2012, 24(3):7-11.
Zhuang X B, Zou H Y, Li N, et al. Characteristics of source rock and new region of oil and gas exploration in Qinnan Sag[J]. Fault-Block Oil & Gas Field, 2011, 18(2):146-149.
Shi W L, Li H Y, Mao L, et al. Hydrocarbon geological characteristics and exploration potential of Qinnan depression in offshore area of Bohai Sea[J]. China Petroleum Exploration, 2014, 19(5):32-40.
Yang H F, Wei G, Wang D Y, et al. Oil sources and exploration significance of Qinhuangdao29-2 oil-gas field[J]. Pe-troleum Geology and Recovery Efficiency, 2011, 18(6):28-31,112-113.
Cai S W, Zhou D H, Wang D Y, et al. Tectonic development characteristics and favorable exploration direction of Qinnan sag in Bohai Bay Basin[J]. Acta Petrolei Sinica, 2019, 40(5):532-541.
Zhang Z, Xu C Q, Guo R, et al. Cenozoic fault system and tectonic evolution of Qinan Sag in Bohai Sea[J]. Fault-Block Oil & Gas Field, 2019, 26(2):158-161,167.
Hu Z W, Wang D Y, Niu C M, et al. Characteristics of fault system and evaluation of hydrocarbon generation potential in western Liaoxi-Qinnan area,China[J]. Journal of Chengdu University of Technology:Science & Technology Edition, 2019, 46(5):618-627.
Lin X X. Application of gravity and magnetic data in the structural study of pre-cenozoic oil and gas basins in the Bohai Sea[D]. Beijing: China University of Geosciences (Beijing), 2012.
Teng C Y, Zou H Y, Hao F. Differential evolution of tectonics and differential enrichment of oil and gas in Bohai Bay Basin[J]. China Science:Earth Sciences, 2014, 44(4):579-590.
Wang D Y, Wang Q B, Liu X J, et al. Characteristics and development model of weathering crust reservoir of gneiss buried hill in Bohai Bay Basin[J]. Lithology, 2019, 35 (4) :1181-1193.
Yang K J, Qi J F, Yu Y X, et al. Fault-related folds in the Bohai Bay area and their petroleum geological significance[J]. Oil Geophysical Prospecting, 2016, 51(3):625-636.
Zhou X H, Yu Y X, Tang L J, et al. Structure and tectonic unit division of cenozoic basins in Bohai Sea[J]. Offshore Oil and Gas of China, 2010, 22 (5) :285-289.
Hou G T, Qian X L, Cai D S. Study on mesozoic-cenozoic tectonic evolution of Bohai Bay Basin[J]. Journal of Peking University:Natural Science Edition, 2001, 37(6):845-851.
Chen G X, Zhang M H, Zhang S. Application of constrained variable density interface inversion method in the study of deep structure of the Bohai Sea[J]. Progress in Geophysics, 2019, 34 (6) :2406-2413.
[16]
张翠梅. 渤海湾盆地南堡凹陷构造—沉积分析[D]. 武汉: 中国地质大学(武汉), 2010.
[16]
Zhang C M. Structural-sedimentary analysis of Nanpu Sag in Bohai Bay Basin[D]. Wuhan: China University of Geosciences(Wuhan), 2010.
Hao T Y, Xu Y, Zhou L H, et al. A comprehensive geophysical study on the macroscopic distribution of pre-cenozoic residual basins—A case study of Dagang area[J]. Chinese Journal of Geophysics, 2008, 51(2):491-502.
Zhang G C, Jia Q J, Wang W Y, et al. Tectonic framework and evolution of the South China Sea[J]. Chinese Journal of Geophysics, 2018, 61 (10):4194-4215.
Lei S Y. A calculation method for generalized terrain correction and isostatic correction of gravity[J]. Marine Geology and Quaternary Geology, 1984, 4(1),101-111.
Wang W Y, Qiu Z Y, Yang Y, et al. Research progress of potential field edge recognition method[J]. Progress in Geophysics, 2010, 25(1):196-210.
[23]
Wang W Y, Pan Y, Qiu Z Y. A new edge recognition technology based on the normalized vertical derivative of the total horizontal derivative for potential data[J]. Applied Geophysics, 2009, 6(3):226-233.
doi: 10.1007/s11770-009-0026-x
Wang D D, Wang W Y, Zhu Y J, et al. Method and extraction methods and application of feature points of edge recognition for potential field[J]. Chinese Journal of Geophysics, 2021, 64(4):1401-1411.
Ji X L, Wang W Y, Qiu Z Y. Study on the separation method of minimum curvature potential field[J]. Chinese Journal of Geophysics, 2015, 58(3):1042-1058.
[26]
Salem A, Williams S, Fairhead D, et al. Interpretation of magnetic data using tilt-angle derivatives[J]. Geophysics, 2008, 73(1):1-10.
[27]
刘强. 重磁反演中欧拉反褶积方法的分析与研究[D]. 北京: 中国地质大学(北京), 2019.
[27]
Liu Q. Analysis and research of Euler deconvolution method in gravity and magnetic inversion[D]. Beijing: China University of Geosxiences (Beijing), 2009.
