Element geochemistry of the Enping Formation in the Baiyun Sag of Pearl River Mouth Basin and their environmental implications
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摘要:
泥岩的元素特征对沉积环境变化有较高的灵敏度，能够较好地保存原始沉积记录。为了明确白云凹陷恩平组烃源岩发育环境，选取凹陷内5口钻井泥岩样品进行元素测试。利用元素地球化学方法，系统分析白云凹陷各洼陷恩平期古水深、古氧相、古气候、古盐度和埋藏效率等古环境指标，结果表明：白云西洼处于水深较深、气候偏冷潮湿、还原性弱的淡水环境，埋藏效率相对最低；白云东洼处于水深较浅、气候湿热、亚还原半咸水环境，埋藏效率高；白云主洼处于水深相对最深、暖湿气候、亚还原—还原的淡水环境，埋藏效率相对中等；白云南洼处于水深总体较浅、暖湿气候、亚还原环境，咸水—半咸水—淡水均有分布，埋藏效率总体趋好。环境恢复结果显示白云主洼、白云东洼和白云南洼恩平期烃源岩的形成和保存条件较好，白云西洼相对较差。
Abstract:The element composition of mudstone may well preserve the original sedimentary information and is highly sensitive to the changes of sedimentary environment. In order to define the depositional environment of source rocks of the Enping Formation in the Baiyun Sag, mudstone samples from 5 drilling holes were selected for analysis of element composition. Studied are such paleoenvironmental parameters as paleo-water depth, paleo-oxygenation facies, paleoclimate, paleosalinity and burial efficiency during the Enping period in the Baiyun Sag. The results indicate that the West Baiyun Sub-sag was then a deep fresh water environment under cold-wet climate, weak reducibility, and lowest burial efficiency; the East Baiyun Sub-sag was located in the partly salted water environment under shallow water depth, wet-hot climate, weak reducibility and high burial efficiency; the Main Baiyun Sub-sag is located in a fresh water environment with deep water depth, warm-wet alternative climate, weak reducibility- reducibility and moderate burial efficiency, while the South Baiyun Sub-sag was located in an environment with generally shallow water depth, warm-wet climate and sub reducing environment, where salt water, semi salt water and fresh water are all observed, and fluctuated relatively high burial efficiency. The above environmental parameters reveal that the genetic and preservative conditions of source rocks in the Main Baiyun Sub-sag, East Baiyun Sub-sag and South Baiyun Sub-sag are highly qualified and much better than those in the West Baiyun Sub-sag.
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表 1 白云凹陷恩平组泥岩元素分析计算
Table 1. Element composition of mudstone samples from Enping Formation in Baiyun Sag
井号 古水深 古氧相 古气候 古盐度 埋藏效率 (Mn/Fe)×100 M值/% Th/U V/(V+Ni) MgO/% Sr/Cu Li/(μg/g) Ni/(μg/g) Moxs/(μg/g) W-1 1.09～2.08
1.494.19～6.92
5.323.92～6.86
4.820.46～0.69
0.600.27～1.01
0.651.30～3.54
2.462.42～21.73
8.031.35～5.06
3.100～0.38
0.12W-2 1.15～2.28
1.6210.75～11.71
11.014.51～5.33
4.790.67～0.72
0.701.63～1.93
1.807.51～11.07
9.0361.00～84.10
71.1530.70～35.50
33.420.78～2.22
1.41W-3 2.74～3.66
3.355.70～5.78
5.723.78～4.62
4.350.81～0.90
0.831.18～1.28
1.224.14～11.38
6.2318.10～89.10
68.734.34～19.70
15.040.56～0.95
0.77W-4 1.44～3.68
1.908.53～10.94
9.304.37～6.53
5.320.60～0.84
0.791.17～1.66
1.464.74～6.65
5.2941.81～78.52
64.8612.24～49.65
20.810.82～1.26
1.01W-5 0.74～2.56
1.336.55～12.62
9.135.01～7.98
6.220.53～0.81
0.731.29～2.83
1.823.28～10.60
5.2356.33～148.00
98.2126.29～103.21
41.030～4.13
1.48注：M值为（MgO/Al2O3）×100；Moxs为生物成因钼；表中数据横线上为最小值-最大值，横线下为平均值。 
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[1] 宋春晖, 鲁新川, 邢强, 等. 临夏盆地晚新生代沉积物元素特征与古气候变迁[J]. 沉积学报, 2007, 25(3):409-416 doi: 10.3969/j.issn.1000-0550.2007.03.012
SONG Chunhui, LU Xinchuan, XING Qiang, et al. Late Cenozoic element characters and palaeoclimatic change of the lacustrine sediments in Linxia Basin, China [J]. Acta Sedimentologica Sinica, 2007, 25(3): 409-416. doi: 10.3969/j.issn.1000-0550.2007.03.012
[2] 程岳宏, 于兴河, 韩宝清, 等. 东濮凹陷北部古近系沙三段地球化学特征及地质意义[J]. 中国地质, 2010, 37(2):357-366 doi: 10.3969/j.issn.1000-3657.2010.02.009
CHENG Yuehong, YU Xinghe, HAN Baoqing, et al. Geochemical characteristics of the 3rd Member of Paleogene Shahejie Formation in Dongpu Depression and their geological implications [J]. Geology in China, 2010, 37(2): 357-366. doi: 10.3969/j.issn.1000-3657.2010.02.009
[3] 朱伟林, 钟锴, 李友川, 等. 南海北部深水区油气成藏与勘探[J]. 科学通报, 2012, 57(24):3121-3129 doi: 10.1007/s11434-011-4940-y
ZHU Weilin, ZHONG Kai, LI Youchuan, et al. Characteristics of hydrocarbon accumulation and exploration potential of the northern South China Sea deepwater basins [J]. Chinese Science Bulletin, 2012, 57(24): 3121-3129. doi: 10.1007/s11434-011-4940-y
[4] 米立军, 何敏, 翟普强, 等. 珠江口盆地深水区白云凹陷高热流背景油气类型与成藏时期综合分析[J]. 中国海上油气, 2019, 31(1):1-12
MI Lijun, HE Min, ZHAI Puqiang, et al. Integrated study on hydrocarbon types and accumulation periods of Baiyun sag, deep water area of Pearl River Mouth basin under the high heat flow background [J]. China Offshore Oil and Gas, 2019, 31(1): 1-12.
[5] 米立军, 张忠涛, 庞雄, 等. 南海北部陆缘白云凹陷油气富集规律及主控因素[J]. 石油勘探与开发, 2018, 45(5):902-913
MI Lijun, ZHANG Zhongtao, PANG Xiong, et al. Main controlling factors of hydrocarbon accumulation in Baiyun Sag at northern continental margin of South China Sea [J]. Petroleum Exploration and Development, 2018, 45(5): 902-913.
[6] 李成海, 王家豪, 柳保军, 等. 珠江口盆地白云凹陷古近系沉积相类型[J]. 沉积学报, 2014, 32(6):1162-1170
LI Chenghai, WANG Jiahao, LIU Baojun, et al. Types and distribution of the paleogene sedimentary facies in Baiyun depression of Pearl River Mouth Basin [J]. Acta Sedimentologica Sinica, 2014, 32(6): 1162-1170.
[7] 朱俊章, 施和生, 庞雄, 等. 白云深水区东部油气成因来源与成藏特征[J]. 中国石油勘探, 2012, 17(4):20-28 doi: 10.3969/j.issn.1672-7703.2012.04.004
ZHU Junzhang, SHI Hesheng, PANG Xiong, et al. Origins and accumulation characteristics of hydrocarbons in eastern Baiyun Deepwater area [J]. China Petroleum Exploration, 2012, 17(4): 20-28. doi: 10.3969/j.issn.1672-7703.2012.04.004
[8] 陈斌, 李勇, 邓涛, 等. 晚三叠世龙门山前陆盆地须家河组泥页岩沉积环境及有机质富集模式[J]. 地质科学, 2019, 54(2):434-451 doi: 10.12017/dzkx.2019.028
CHEN Bin, LI Yong, DENG Tao, et al. The sedimentary environment and organic matter enrichment pattern of Xujiahe Formation shale in the Late Triassic Longmenshan foreland basin, SW China [J]. Chinese Journal of Geology, 2019, 54(2): 434-451. doi: 10.12017/dzkx.2019.028
[9] Kaufman A J, Knoll A H. Neoproterozoic variations in the C-isotopic composition of seawater: stratigraphic and biogeochemical implications [J]. Precambrian Research, 1995, 73(1-4): 27-49. doi: 10.1016/0301-9268(94)00070-8
[10] 陈波, 薛雨见君, 赵云南, 等. 柴北缘平台地区下干柴沟组下段元素地球化学特征及意义[J]. 特种油气藏, 2019, 26(1):12-17
CHEN Bo, XUE Yujianjun, ZHAO Yunnan, et al. Geochemical characteristic and significance of elements in lower member of Lower Ganchaigou formation in the platform area on North Margin of Qaidam Basin [J]. Special Oil and Gas Reservoir, 2019, 26(1): 12-17.
[11] 陈强, 张慧元, 李文厚, 等. 鄂尔多斯奥陶系碳酸盐岩碳氧同位素特征及其意义[J]. 古地理学报, 2012, 24(1):117-124 doi: 10.7605/gdlxb.2012.01.010
CHEN Qiang, ZHANG Huiyuan, LI Wenhou, et al. Characteristics of carbon and oxygen isotopes of the Ordovician carbonate rocks in Ordos and their implication [J]. Journal of Palaeogeography, 2012, 24(1): 117-124. doi: 10.7605/gdlxb.2012.01.010
[12] 邓宏文, 钱凯. 沉积地球化学与环境分析[M]. 甘肃: 甘肃科学技术出版社, 1993: 1-31.
DENG Hongwen, QIAN Kai. Sedimentary Geochemistry and Environment Analysis[M]. Lanzhou: Gansu Science and Technology Press, 1993: 1-31.
[13] 曾智伟, 朱红涛, 杨香华, 等. 珠江口盆地白云凹陷恩平组物源转换及沉积充填演化[J]. 地球科学, 2017, 42(11):1936-1954
ZENG Zhiwei, ZHU Hongtao, YANG Xianghua, et al. Provenance transformation and sedimentary evolution of Enping formation, Baiyun Sag, Pearl River Mouth Basin [J]. Earth Science, 2017, 42(11): 1936-1954.
[14] 腾格尔, 刘文汇, 徐永昌, 等. 缺氧环境及地球化学判识标志的探讨——以鄂尔多斯盆地为例[J]. 沉积学报, 2004, 22(2):365-372 doi: 10.3969/j.issn.1000-0550.2004.02.026
TENGER, LIU Wenhui, XU Yongchang, et al. The discussion on anoxic environments and its geochemical identifying indices [J]. Acta Sedimentologica Sinica, 2004, 22(2): 365-372. doi: 10.3969/j.issn.1000-0550.2004.02.026
[15] Wignall P B, Twitchett R J. Oceanic anoxia and the end Permian mass extinction [J]. Science, 1996, 272(5265): 1155-1158. doi: 10.1126/science.272.5265.1155
[16] Jones B, Manning D A C. Comparison of Geochemical indices used for the interpretation of palaeoredox conditions in ancient mudstones [J]. Chemical Geology, 1994, 111(1-4): 111-129. doi: 10.1016/0009-2541(94)90085-X
[17] 王峰, 刘玄春, 邓秀芹, 等. 鄂尔多斯盆地纸坊组微量元素地球化学特征及沉积环境指示意义[J]. 沉积学报, 2017, 35(6):1265-1273
WANG Feng, LIU Xuanchun, DENG Xiuqin, et al. Geochemical characteristics and environmental implications of trace elements of Zhifang formation in Ordos Basin [J]. Acta Sedimentologica Sinica, 2017, 35(6): 1265-1273.
[18] Owen L A, Finkel R C, Barnard P L, et al. Climatic and topographic controls on the style and timing of Late Quaternary glaciation throughout Tibet and the Himalaya defined by 10Be cosmogenic radionuclide surface exposure dating [J]. Quaternary Science Reviews, 2005, 24(12-13): 1391-1411. doi: 10.1016/j.quascirev.2004.10.014
[19] 田景春, 张翔. 沉积地球化学[M]. 北京: 地质出版社, 2016: 63-77.
TIAN Jingchun, ZHANG Xiang. Sedimentary Geochemistry[M]. Beijing: Geological Publishing House, 2016: 63-77.
[20] 曹婷婷, 徐思煌, 王约, 等. 四川盆地南江杨坝地区下寒武统烃源岩形成的地球生物学条件[J]. 石油与天然气地质, 2011, 32(1):11-16 doi: 10.11743/ogg20110102
CAO Tingting, XU Sihuang, WANG Yue, et al. Geobiological conditions for the formation of the Lower Cambrian source rocks in Yangba area of Nanjiang County in the Sichuan Basin [J]. Oil & Gas Geology, 2011, 32(1): 11-16. doi: 10.11743/ogg20110102
[21] Siebert C, McManus J, Bice A, et al. Molybdenum isotope signatures in continental margin marine sediments [J]. Earth and Planetary Science Letters, 2006, 241(3-4): 723-733. doi: 10.1016/j.jpgl.2005.11.010
[22] 刘占红, 李思田, 辛仁臣, 等. 地层记录中的古气候信息及其与烃源岩发育的相关性——以渤海黄河口凹陷古近系为例[J]. 地质通报, 2007, 26(7):830-840 doi: 10.3969/j.issn.1671-2552.2007.07.006
LIU Zhanhong, LI Sitian, XIN Renchen, et al. Paleoclimatic information in stratigraphic records and its relation to the formation of hydrocarbon source rocks—A case study of the Paleogene strata in the Huanghekou subbasin of the Bohai Bay basin, China [J]. Geological Bulletin of China, 2007, 26(7): 830-840. doi: 10.3969/j.issn.1671-2552.2007.07.006
[23] 夏刘文, 曹剑, 徐田武, 等. 盐湖生物发育特征及其烃源意义[J]. 地质论评, 2017, 63(6):1549-1562
XIA Liuwen, CAO Jian, XU Tianwu, et al. Development characteristics of Biologies in saline lake environments and their implications for hydrocarbon source [J]. Geological Review, 2017, 63(6): 1549-1562.
[24] 张斌, 何媛媛, 陈琰, 等. 柴达木盆地西部咸化湖相优质烃源岩形成机理[J]. 石油学报, 2018, 39(6):674-685 doi: 10.7623/syxb201806006
ZHANG Bin, HE Yuanyuan, CHEN Yan, et al. Formation mechanism of excellent saline lacustrine source rocks in western Qaidam Basin [J]. Acta Petrolei Sinica, 2018, 39(6): 674-685. doi: 10.7623/syxb201806006
[25] 殷杰, 王权, 郝芳, 等. 渤海湾盆地饶阳凹陷沙一下亚段古湖泊环境与烃源岩发育模式[J]. 地球科学, 2017, 42(7):1209-1222
YIN Jie, WANG Quan, HAO Fang, et al. Palaeolake environment and depositional model of source rocks of the lower submember of Sha1 in Raoyang Sag, Bohai Bay Basin [J]. Earth Science, 2017, 42(7): 1209-1222.
[26] 陈笑夜, 曹剑, 施春华, 等. 陆相湖盆海侵地质事件识别及其对烃源岩形成影响[J]. 地质评论, 2012, 58(5):901-910
CHEN Xiaoye, CAO Jian, SHI Chunhua, et al. A review on the distinguishing of marine transgression in continental basins and its impacts on the formation of hydrocarbon source rocks [J]. Geological Review, 2012, 58(5): 901-910.
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