A study of the distribution characteristics of basin tectonic units based on gravity data in Madagascar and its adjacent basins
Xue-Fa WANG1,2,3(), Wan-Yin WANG1,2,3(), Jie MA1,2,3, Min YANG1,2,3,4, Jian-She LIANG5, Chun-Guang QIU5, Ding-Ding WANG1,2,3, Xiao-Lin JI1,2,3, Jin-Lan LIU1,2,3
1. Insititute of Gravity and Magnetic Technology,Chang’an University,Xi’an 710054,China 2. College of Geology Engineering and Geomatics,Chang’an University,Xi’an 710054,China 3. Key Laboratory of Western China’s Mineral Resources and Geological Engineering,Ministry of Education,Chang’an University,Xi’an 710054,China 4. Department of Earth Sciences,Memorial University of Newfoundland,St.Johns’,A1B3X5,Canada 5. Cnooc Research Institute Limited,Beijing 100027,China
With offering the increasing opening exploration of oil and gas resources to the oversea exploration companies in Africa which remains in an early exploration stage, a good opportunity is provided for the companies in China. In this study, the gravity data of this research area were collected in order to study the tectonic characteristics of Malagasy Island, which has insufficient oil and gas geological data but abundant mineral resources. The faults and the boundaries of this basin were identified according to the response of the gravity anomaly to the sediments by the separation method of the minimum curvature, the vertical derivative of the normalized total horizontal derivative (NVDR-THDR) and the inversion of the depth of the curvature attribute, with Bouguer gravity anomaly. The geological and geophysical characteristics of the main faults were analyzed, and the distribution characteristics of faults and basins were determined, which were based on the geological and geophysical data. According to this research, there are 9 primary faults and 11 secondary faults inferred in this study area trending NNE, NE and nearly NS. The tectonics of Tamatave Basin, Morondava Basin and Majunga Basin were re-divided into 7 depressions and 3 uplifts combined with the distribution of faults from this study and previous studies, which are shown as a zonal distribution like "two depressions with one uplift". This research can provide geophysical information for exploration of oil, gas and mineral resources in Madagascar and its adjacent regions.
王学发, 王万银, 马杰, 杨敏, 梁建设, 邱春光, 王丁丁, 纪晓琳, 刘金兰. 基于重力资料的马达加斯加岛及邻区盆地构造单元分布特征[J]. 物探与化探, 2020, 44(4): 928-937.
Xue-Fa WANG, Wan-Yin WANG, Jie MA, Min YANG, Jian-She LIANG, Chun-Guang QIU, Ding-Ding WANG, Xiao-Lin JI, Jin-Lan LIU. A study of the distribution characteristics of basin tectonic units based on gravity data in Madagascar and its adjacent basins. Geophysical and Geochemical Exploration, 2020, 44(4): 928-937.
Wen Z X, Wang Z M, Song C P, et al. Structural architecture difference and petroleum exploration of passive continental margin basins in East Africa[J]. Petroleum Exploration and Development, 2015,42(5):671-680.
[2]
IHS. International energy oil & gas industry solutioSN[DB/OL]. [2018-12-30]. http://www.ihs.com/industry/oil-gas/international .aspx.
[3]
Selley R C, Van Der Spuy D. The oil and gas basin of Africa[J]. IUGS, 2016,39(2):429-445.
Zhang G Y, Liu X B, Wen Z X, et al. Structural and sedimentary characteristics of passive continental margin basins in east Africa and their effect on the formation of giant gas fields[J]. China Petroleum Exploration, 2015,20(4):71-80.
Zhang G Y, Liu X B, Zhao J, et al. Passive continental margin basin evolution of East Africa and the main controlling factors of giant gas fields: an example from the Rovuma Basin[J]. Earth Science Frontiers, 2018,25(2):24-32.
Yu X, Hou G T, Dai S H, et al. Tectonic evolution and hydrocarbonpooling patterns analysis in East Africa continental margin[J]. Geological Science and Technology Information, 2015,34(6):147-154.
[9]
Phethean J J J, Kalnins L M, Hunen J V, et al. Madagascar's escape from Africa: A high-resolution plate reconstruction for the Western Somali Basin and implications for supercontinent dispersal[J]. Geochemistry, Geophysics, Geosystems, 2016,17(12):5036-5055.
[10]
Collins A S, Windley B F. The tectonic evolution of central and northern Madagascar and its place in the final assembly of Gondwana Madagascar: lts place in the Last African Orogen[J]. Journal of Geology, 2002,110(3):325-340.
[11]
Collins A S, Kroner A, Fitzsimons I C W, et al. Structure of the eastern margin of the East African Orogen in central Madagascar[J]. Precambrian Research, 2003,123(2):111-133.
[12]
Schandelmeier H, Bremer F, Holl H G. Kinematic evolution of the Morondava rift basin of SW Madagascar-from wrench tectonics to normal extension[J]. Journal of African Earth Sciences, 2003,38(4):321-330.
Yang M J, Di Y J, Zhang D, et al. Genetic analysis of Antanisoa graphite deposit in Madagascar[J]. Mineral Deposits, 2020,39(2):381-396.
[15]
Windley B F, Razafiniparany A, Razakamanana T, et al. Tectonic framework of the Precambrian of Madagascar and its Gondwana connections: a review and reappraisal[J]. Geologische Rundschau, 1994,83(3):642-659.
Ma J, Liu J P, Pan X H, et al. Geological characteristics and prospect on hydrocarbon exploration in east Africa continental margin[J]. Global Geology, 2008,27(4):400-405.
Jin C, Chen A Q, Lou Z H, et al. Tectonic evolution and hydrocarbon accumulation principle in east Africa[J]. Journal of Jilin University: Earth Science Edition, 2012,42(s2):121-130.
[20]
Geiger M, Schweigert G. Toarcian-Kimmeridgian depositional cycles of the south-western Morondava Basin along the rifted continental margin of Madagascar[J]. Facies, 2006,52(1):85-112.
He W X, Jiang K X, Wan H, et al. Heavy oil accumulation characteristic of the Tsimiroro oilfield in Morondava Basin, Easter Africa[J]. Geological Science and Technology Information, 2017,36(5):60-68.
[22]
Tamannai M S, Winstone D, Deighton I. An evaluation of the petroleum system-offshore Morondava basin, Madagascar, based on 2D seismic data interpretation[C]// European Association of Geoscientists & Engineers.70th EAGE Conference & Exhibition, 2009:1-5.
Wang W Y, Pan Z S. Fast solution of forward and inverse problem for gravity field in a dual interface model[J]. Geophysical Prospecting for Petroleum, 1993,38(2):81-87, 123.
Wang W Y, Ren F L, Wang Y P, et al. The application research on the gravity exploration in sedimentary bauxite deposit survey[J]. Geophysical and Geochemical Exploration, 2014,38(3):409-416.
[25]
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
[26]
刘金兰. 重磁位场新技术与山西断陷盆地构造识别划分研究[D]. 西安:长安大学, 2008.
[26]
Liu J L. Development new technologies for potential field processing and research on the tectonic recognition &. division of Shanxi fault basin[D]. Xi’an:Chang'an University, 2008.
Ji X L, Wang W Y, Qiu Z Y. The research to the minimum curvature technique for potential field data separation[J]. Chinese Journal of Geophysics, 2015,58(3):1042-1058.
Ji X L, Wang W Y, Qiu Z Y. Parameter choose experimental research to the minimum curvature technique potential field data separation method[J]. Progress in Geophysics, 2019,34(4):1441-1452.
