Spherulite-dendritic crystal characteristics and its genesis of the Lower Cretaceous lacustrine carbonate rocks in Santos Basin,Brazil
SUN Haitao1,2, HUANG Xiaojie1,2, YANG Liu3, FAN Guozhang3, HUANG Xiaojuan1,2, WANG Hongping3, ZHONG Dakang1,2, ZHOU Siyu1,2
1 College of Geosciences,China University of Petroleum(Beijing),Beijing 102249,China; 2 Carbonate Research Center,China University of Petroleum(Beijing),Beijing 102249,China; 3 PetroChina Hangzhou Research Institute of Geology,Hangzhou 310023,China
Abstract：The Lower Cretaceous Barra Velha Formation in Santos Basin,Brazil,consists of lacustrine carbonate components with spherical,dendritic and shrub structures,but their origin has not been unified yet. Based on the analysis of drilling core and thin section data,combined with geochemical data and regional tectonic background,this paper analyzes the characteristics of various components,classification, and depositional environments of these carbonate rocks. The research shows that spherical crystals with cross extinction under orthogonal light developed in the Barra Velha Formation,also including fan-shaped crystals,dendriform crystals and dendritic crystals with undulatory extinction. The micritic limestone,spherical crystal and dendritic crystal formed an upper vertical sequence. Trace elements,carbon and oxygen isotopes,and clumped isotopes,suggest a high-salinity and high-temperature fluid condition when the spherulite-dendritic crystals were deposited. In combination with regional tectonic background of the Santos Basin,this paper proposes the spherical crystal-dendritic particles were caused by the hydrothermal fluid connected by the deep large faults,and the saline minerals charge supplied by the frequent seawater transgression. This model better explains the characteristics of the rapid growth of spherulite-dendritic particles,and provides a new theoretical basis for the genesis and distribution of carbonate reservoirs in this basin.
SUN Haitao,HUANG Xiaojie,YANG Liu et al. Spherulite-dendritic crystal characteristics and its genesis of the Lower Cretaceous lacustrine carbonate rocks in Santos Basin,Brazil[J]. JOPC, 2023, 25(5): 1199-1210.
[1] 何赛,李国蓉,吴昌荣,刘树根,张忠民,苏玉山,朱奕璇,何钊,任杰,王雨辰,周伟,王亚捷. 2022. 巴西桑托斯盆地湖相微生物碳酸盐岩层序沉积特征及控制因素. 石油勘探与开发, 49(4): 683-692. [He S,Li G R,Wu C R,Liu S G,Zhang Z M,Su Y S,Zhu Y X,He Z,Ren J,Wang Y C,Zhou W,Wang Y J.2022. Sedimentary filling characteristics and controlling factors of lacustrine microbial carbonates sequence in the Santos Basin,Brazil. Petroleum Exploration and Development, 49(4): 683-692] [2] 康洪全,吕杰,程涛,贾怀存,白博. 2018. 巴西桑托斯盆地盐下湖相碳酸盐岩储层特征. 海洋地质与第四纪地质, 38(4): 170-178. [Kang H Q,Lü J,Cheng T,Jia H C,Bai B.2018. Characters of pre-salt lacustrine carbonate reservoir,Santos Basin,Brazil. Marine Geology & Quaternary Geology, 38(4): 170-178] [3] 李平平,马倩倩,邹华耀,余新亚. 2017. 团簇同位素的基本原理与地质应用. 古地理学报, 19(4): 713-728. [Li P P,Ma Q Q,Zou H Y,Yu X Y.2017. Basic principle of clumped isotopes and geological applications. Journal of Palaeogeography(Chinese Edition), 19(4): 713-728] [4] 罗晓彤,文华国,彭才,李云,赵研. 2020. 巴西桑托斯盆地L油田BV组湖相碳酸盐岩沉积特征及高精度层序划分. 岩性油气藏, 32(3): 68-81. [Luo X T,Wen H G,Peng C,Li Y,Zhao Y.2020. Sedimentary characteristics and high-precision sequence division of lacustrine carbonate rocks of BV Formation in L oilfield of Santos Basin,Brazil. Lithologic Reservoirs, 32(3): 68-81] [5] 王颖,王晓州,康洪全,朱石磊,蔡露露,廖计华. 2017. 桑托斯盆地白垩系湖相碳酸盐岩微生物礁滩的成因. 成都理工大学学报(自然科学版), 44(1): 67-75. [Wang Y,Wang X Z,Kang H Q,Zhu S L,Cai L L,Liao J H.2017. Genetic analysis of microbial reef-bank of Cretaceous lacustrine carbonate in Santos Basin,Brazil. Journal of Chengdu University of Technology(Science & Technology Edition), 44(1): 67-75] [6] 王颖,王晓州,廖计华,朱石磊,蔡露露. 2016. 巴西桑托斯盆地白垩系湖相藻叠层石礁特征及主控因素分析. 沉积学报, 34(5): 819-829. [Wang Y,Wang X Z,Liao J H,Zhu S L,Cai L L.2016. Characteristics and main controlling factors of Cretaceous lacustrine algal Stromatolite reefs in Santos Basin,Brazil. Acta Sedimentologica Sinica, 34(5): 819-829] [7] 吴亚生,姜红霞,李莹,虞功亮. 2021. 微生物碳酸盐岩的显微结构基本特征. 古地理学报, 23(2): 321-334. [Wu Y S,Jiang H X,Li Y,Yu G L.2021. Microfabric characteristics of microbial carbonates. Journal of Palaeogeography(Chinese Edition), 23(2): 321-334] [8] 张德民,段太忠,张忠民,郝雁,姚威. 2018. 湖相微生物碳酸盐岩沉积相模式研究: 以桑托斯盆地A 油田为例. 西北大学学报(自然科学版), 48(3): 413-422. [Zhang D M,Duan T Z,Zhang Z M,Hao Y,Yao W.2018. Facies model of lacustrine microbial carbonates: a case study from A oilfield,Santos Basin. Journal of Northwest University(Natural Science Edition), 48(3): 413-422] [9] 朱奕璇,张忠民,张德民. 2022. 巴西桑托斯盆地早白垩世微生物碳酸盐岩沉积环境与成因. 岩石学报, 38(9): 2619-2633. [Zhu Y X,Zhang Z M,Zhang D M.2022. Sedimentary environment and genesis of the Early Cretaceous microbial carbonates in Santos Basin,Brazil. Acta Petrologica Sinica, 38(9): 2619-2633] [10] Bastianini L,Rogerson M,Mercedes-Martín R,Prior T J,Mayes W M.2022. What are the different styles of calcite precipitation within a hyperalkaline leachate?a sedimentological anthropocene case study. The Depositional Record, 8: 355-381. [11] Cook M,Chafetz H S.2017. Sloping fan travertine,belen,new Mexico,USA. Sedimentary Geology, 352: 30-44. [12] Farias F,Szatmari P,Bahniuk A,França A B.2019. Evaporitic carbonates in the pre-salt of Santos Basin: genesis and tectonic implications. Marine and Petroleum Geology, 105: 251-272. [13] Fornero S A,Marins G M,Lobo J T,Freire A F M,de Lima E F.2019. 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. Marine and Petroleum Geology, 99: 156-174. [14] Gomes J P,Bunevich R B,Tedeschi L R,Tucker M E,Whitaker F F.2020. Facies classification and patterns of lacustrine carbonate deposition of the Barra Velha Formation,Santos Basin,Brazilian pre-salt. Marine and Petroleum Geology, 113: 104176. [15] Herlinger J R,Zambonato E E,De Ros L F.2017. Influence of diagenesis on the quality of Lower Cretaceous pre-salt lacustrine carbonate reservoirs from northern Campos Basin,offshore Brazil. Journal of Sedimentary Research,87(12):1285-1313. [16] Jones B,Renaut R W.2008. Cyclic development of large,complex,calcite dendrite crystals in the Clinton travertine,Interior British Columbia,Canada. Sedimentary Geology, 203: 17-35. [17] Keith M L,Weber J N.1964. Carbon and oxygen isotopic composition of selected limestones and fossils. Geochimica et Cosmochimica Acta, 28(10-11): 1787-1816. [18] Lima B E M,de Ros L F.2019. Deposition,diagenetic and hydrothermal processes in the Aptian pre-salt lacustrine carbonate reservoirs of the northern Campos Basin,offshore Brazil. Sedimentary Geology, 383: 55-81. [19] Lopez B,Camoin G,Özkul M,Swennen R,Virgone A.2017. Sedimentology of coexisting travertine and tufa deposits in a mounded geothermal spring carbonate system,Obruktepe,Turkey. Sedimentology, 64: 903-931. [20] Louback V S,de Castro Valente S,de Almeida C N,Ross J,Borghi L.2021. Petrogenesis and geodynamics of Eocene alkaline intrusions in the pre-salt sedimentary sequence of Santos Basin,Brazil. Lithos, 400-401: 106400. [21] Mercedes-Martín R,Rogerson M,Prior T,Brasier A,Reijmer J,Billing I,Matthews A,Love T,Lepley S W,Pedley M.2021. Towards a morphology diagram for terrestrial carbonates: evaluating the impact of carbonate supersaturation and alginic acid in calcite precipitate morphology. Geochimica et Cosmochimica Acta, 306: 340-361. [22] Mercedes-Martín R,Rao A,Rogerson M,Sánchez-Román M.2022. Effects of salinity,organic acids and alkalinity on the growth of calcite spherulites: implications for evaporitic lacustrine sedimentation. The Depositional Record, 8: 143-164. [23] Mercedes-Martín R,Brasier A T,Rogerson M,Reijmer J J,Vonhof H,Pedley M.2017. A depositional model for spherulitic carbonates associated with alkaline,volcanic lakes. Marine and Petroleum Geology, 86: 168-191. [24] Nunn J A,Harris N B.2007. Subsurface seepage of seawater across a barrier: a source of water and salt to peripheral salt basins. Geological Society of America Bulletin, 119: 1201-1217. [25] Pietzsch R.2021. Comment on “Evaporitic carbonates in the pre-salt of Santos Basin: genesis and tectonic implications”. Marine and Petroleum Geology, 133: 104963. [26] Rogerson M,Mercedes-Martín R,Brasier A T,McGill R A R,Prior T J,Vonhof H,Fellows S M,Reijmer J J G,McClymont E,Billing I,Matthews A,Pedley H M.2017. Are spherulitic lacustrine carbonates an expression of large-scale mineral carbonation?a case study from the East Kirkton Limestone,Scotland. Gondwana Research, 48: 101-109.
