| Citation: | Zhao Jian, Zhang Jie, Zhao Junfeng, Ren Kangxu, Wang Chaofeng, Guo Yuan. Characteristics of igneous rocks and their significance in hydrocarbon accumulation in Block C of Santos Basin, SE Brazil[J]. Bulletin of Geological Science and Technology, 2023, 42(2): 60-68. doi: 10.19509/j.cnki.dzkq.tb20210489
|
Santos Basin is characterized by multiple phases of magmatic events and widespread distribution of igneous rocks, which have significant affect of hydrocarbon accumulation. Taking Block C of Santos Basin as a typical and representative example, this paper focused on the characteristics of igneous rocks and their roles in hydrocarbon accumulation through the analysis of igneous rock petrology, geochronology, petrogeochemistry, and gas isotopes. In Block C, at least two main stages of magma events were developed: Aptian magma (122.8±0.6-110.8±0.6 Ma) and Santonian-Campanian magma (84.2±0.7-77.4±0.4). The Aptian magma is dominated by eruptive rocks and has experienced dozens of eruptions, accompanied by several layers of subvolcanic rocks. In comparison, Santonian-Campanian magma is distributed in a relatively random pattern. The multipulse eruption of Aptian magma formed an igneous rock-coquinas complex of more than 600 meters in thickness, inducing a local paleohigh in Itapema Formation. This directly caused the trap crest to shift and contributed to the development of high-quality carbonate deposition in Barra Velha Formation. Before the eruption of Aptian magma, the north flank of Block C was paleohigh, where a particular scale of microbial carbonate reservoirs was anticipated to develop in the Barra Velha Formation as well. These carbonate reservoirs were favorable for hydrocarbon accumulation. The later Santonian-Campanian intrusions also impact carbonate reservoirs through hydrothermal fluid circulation and contact metamorphism. Meanwhile, a large amount of associated CO2 accumulated in the trap led to a high GOR (gas oil ratio) and high CO2 content and changed the fluid composition through the extraction process.A CO2 gas reservoir with condensed oil was eventually formed in the current crest in Block C, as proven by drilled well A.Another pool with high CO2 content is also expected in its north flank, to be demonstrated in the future.
| [1] |
Ren K X, Oliveira M J R, Zhao J F, et al. Metamorphism of pre-salt limestones produced by Santonian-Campanian alkaline sills in the Libra Block, Santos Basin[C]//Anon. LASI VI Conference, Abstracts. 2019: 131-132.
|
| [2] |
Anna C L S, Sandra N T, Egberto P. Silicification and dissolution features in the Brazilian Pre-salt Barra Velha formation: Impacts in the reservoir quality and insights for 3D geological modeling[C]//Anon. Rio Oil & Gas Expo and Conference, Rio de Janeiro, RJ, Brazil, 2020.
|
| [3] |
Ren K X, Zhao J F, Zhao J, et al. Using logging and seismic data to identify boundaries between different OWC units in a deepwater carbonate reservoirs[C]//International Petroleum Technology Conference, Virtual, March 2021.
|
| [4] |
程涛, 康洪全, 梁建设, 等. 巴西桑托斯盆地岩浆岩成因类型划分与活动期次分析[J]. 中国海上油气, 2019, 31(4): 55-66. https://www.cnki.com.cn/Article/CJFDTOTAL-ZHSD201904007.htm
Cheng T, Kang H Q, Liang J S, et al. Genetic classification and activity periods analysis of magmatic rocks in Santos Basin, Brazil[J], China Offshore Oil and Gas, 2019, 31(4): 55-66(in Chinese with English abstract). https://www.cnki.com.cn/Article/CJFDTOTAL-ZHSD201904007.htm
|
| [5] |
Penna R, Araújom S, Geisslinger A, et al. Carbonate and igneous rock characterization through reprocessing, FWI imaging, and elastic inversion of a legacy seismic data set in Brazilian pre-salt province[J]. The Leading Edge, 2019, 38: 11-19. doi: 10.1190/tle38010011.1
|
| [6] |
Fornero S A, Marins G M, Lobo J T, et al. Characterization of subaerial volcanic facies using acoustic image logs: Lithofacies and log-facies of a lava-flow deposit in the Brazilian pre-salt, deepwater of Santos Basin[J]. Marine and Petroleum Geology, 2019, 99: 156-174. doi: 10.1016/j.marpetgeo.2018.09.029
|
| [7] |
Meisling K E, Cobbold P R, Mount V S. Segmentation of an obliquely rifted margin, Campos and Santos basins, southeastern Brazil[J]. AAPG Bulletin, 2001, 85: 1903-1924.
|
| [8] |
Dickson W, Schiefeelbein S, Zumberge J, et al. Basin Analysis in Brazilian and West African Conjugates: Combining disciplines to deconstruct petroleum systems[C]//Anon. GCSSEPM Foundation 25th Annual Bob F. Perkins Research Conference, Houston TX, 2005.
|
| [9] |
Aslanian D, Moulin M, Olivet J L, et al. Brazilian and Africanpassive margins of the central segment of the South Atlantic Ocean: Kinematic constraints[J]. Tectonophysics, 2008, 468: 98-112.
|
| [10] |
Stanton N, Ponte-Neto C F, Bijani R, et al. The rifting evolution of the Santos Basin: A geophysical view[C]//Anon. Thirteenth International Congress of the Brazilian Geophysical Society(SBGf), 2013.
|
| [11] |
Moreira J L P, Madeira C V, Gil J A, et al. Bacia de Santos[J]. Boletim de Geociencias da Petrobras, 2007, 15: 531-549.
|
| [12] |
Dickson W G, Fryklund R E, Odegard M E, et al. Constraints for plate reconstruction using gravity data-implications for source and reservoir distribution in Brazilian and West African margin basins[J]. Marine and Petroleum Geology, 2003, 20(3/4): 309-322.
|
| [13] |
Zhao J, Maria J R O, Junfeng Z, et al. Fault activity and its influences on distribution of igneous rocks in Libra Block, Santos Basin: Semi-quantitative to quantitative assessment of fault activity based on high-resolution 3D seismic data[C]//Anon. Offshore Technology Conference Brasil(OTC), Rio de Janeiro, Brazil. 2019.
|
| [14] |
Norvick M S, Schaller H. A Three-phase Early Cretaceousrift history of the South Atlantic salt basins and its influence on lacustrine source facies distribution[C]//Anon. ABGP International Conference and Exhibition, Rio de Janeiro, Brazil, 1998.
|
| [15] |
Modica C J, Brush E R. Post-rift sequence stratigraphy, paleogeography, and fill history of the deep-water Santos Basin, Offshore Southeast Brazil[J]. AAPG Bulletin, 2004, 88(7): 923-945. doi: 10.1306/01220403043
|
| [16] |
Wright V P, ToscaA N J. A geochemical model for the formation of the pre-salt reservoirs, Santos Basin, Brazil: Implications for Understanding reservoir distribution[C]//Anon. AAPG Annual Convention & Exhibition, Calgary, Alberta, Canada, 2016.
|
| [17] |
Williams H D, Burgess P, Wright V P, et al. Investigating carbonate platform types: Multiple controls and a continuum of geometries[J]. Journal of Sedimentary Research, 2011, 81: 18-37. doi: 10.2110/jsr.2011.6
|
| [18] |
Terra G J S, Spadini A R, Franca A B, et al. Carbonate rock classification for Brazilian sedimentary basins[J]. Boletim de Geociencias da Petrobras, 2009, 18: 9-29.
|
| [19] |
Wright V P, Barnett A J. An abiotic model for the development of textures in some South Atlantic Early Cretaceous lacustrine carbonates[J]. Geological Society, London, Special Publications, 2015, 418: 209-219. doi: 10.1144/SP418.3
|
| [20] |
Santos E V, Cerqueira J R, Prinzhofer A. Origin of CO2 in Brazilian Basins[C]//AAPG Annual Convention and Exhibition, Long Beach, California, 2012.
|
| [21] |
赵健, 赵俊峰, 任康绪, 等. 巴西桑托斯盆地CO2区域分布及主控因素[J]. 地球科学, 2021, 46(9): 3217-3229. https://www.cnki.com.cn/Article/CJFDTOTAL-DQKX202109013.htm
Zhao J, Zhao J F, Ren K X, et al. Distribution and main controlling factors of CO2 in Santos Basin, Brazil[J]. Earth Science, 2021, 46(9): 3217-3229(in Chinese with English abstract). https://www.cnki.com.cn/Article/CJFDTOTAL-DQKX202109013.htm
|
| [22] |
刘妍鷨, 陈红汉, 王艳飞, 等. 珠江口盆地白云-荔湾深水区幔源CO2充注的黏土矿物成岩响应[J]. 地质科技通报, 2021, 40(3): 85-95. https://www.cnki.com.cn/Article/CJFDTOTAL-DZKQ202103010.htm
Liu Y H, Chen H H, Wang Y F, et al. Diagenetic effect of mantle-derived CO2 charge to clay minerals in the Baiyun-Liwan deepwater area of the Pearl River Mouth Basin in South China Sea[J]. Bulletin of Geological Science and Technology, 2021, 40(3): 85-95(in Chinese with English abstract). https://www.cnki.com.cn/Article/CJFDTOTAL-DZKQ202103010.htm
|
| [23] |
Gamboa L, Ferraz A, Baptista R, et al. Geotectonic controls on CO2 formation and distribution processes in the Brazilian pre-salt basins[J]. Geosciences, 2019, 9(6): 252. doi: 10.3390/geosciences9060252
|
| [24] |
赵健, 赵俊峰, 任康绪, 等. 巴西桑托斯盆地高含CO2油气藏类型、特征及成因模式[J]. 吉林大学学报: 地球科学版, 2021, 51(6): 1654-1664. https://www.cnki.com.cn/Article/CJFDTOTAL-CCDZ202106003.htm
Zhao J, Zhao J F, Ren K X, et al. Main types, characteristics and genetic model of oil & gas reservoirs with high CO2 content in Santos Basin, Brazill[J]. Journal of Jilin University: Earth Science Edition, 2021, 51(6): 1654-1664(in Chinese with English abstract). https://www.cnki.com.cn/Article/CJFDTOTAL-CCDZ202106003.htm
|
Copyright © 2010Editorial Department of Bulletin of Geological Science and Technology
Supported by:
Beijing Renhe Information Technology Co., Ltd.
DownLoad:
