黑色页岩氧化还原条件与有机质富集机制——以昭通页岩气示范区A井五峰组-龙马溪组下段为例

doi:10.11743/ogg20170512

Abstract

Abstract: The Wufeng-lower Longmaxi Formations are the main exploration targets of the Zhaotong shale gas demonstration area.Based on systematic tests of organic carbon,trace elements and REE (rare earth elements) upon samples from Well A in the area,as well as petrological and logging data,we analyzed the variations of geochemical parameters of relevant elements in black shale samples from Well A and tried to reveal the redox conditions of black shale and discuss the possible mechanisms of organic matter enrichment in the area.The results show that the sub-member I of the Wufeng-lower Longmaxi Formations in the area have the highest content of TOC,which is averaged at 3.13% and displays an upward decreasing trend.The enrichment of relevant elements is also observed to be connected with TOC content.Redox parameters such as trace elements and REE indicate that the Wufeng-lower Longmaxi Formations had once experienced anaerobic redox water body turning to a suboxidizing water body with the sub-member I in an anoxic-anaerobic environment,the sub-member Ⅱ in an anoxic environment and the sub-member Ⅲ in an anoxic -oxygen enriched environment.Among them the water body reducibility of layers I-1,I-3,and I-4,is stronger than that of layers I-2 and I-5.And there were still disparities in the forming mechanisms of redox environment for organic matter enrichment in black shale of the Wufeng and Longmaxi Formations against a high paleo-productivity in the area.For the Wufeng Formation,it was a stagnant water body that preserved the organic matter in an anaerobic-anoxic environment,and for the lower Longmaxi Formation,it was sea level rising that kept a rich organic matter in an anaerobic environment.The sub-member I at the Wufeng-lower Longmaxi Formations has the richest TOC and thus is regarded as the best target for shale gas development.

Key words: redox condition, organic matter enrichment, trace element, rare earth element, shale gas, black shale

CLC Number:

TE121.1

Wang Pengwan, Zhang Lei, Li Chang, Li Xianjing, Zou Chen, Zhang Zhao, Li Junjun, Li Qingfei. Redox conditions and organic enrichment mechanisms of black shale:A case from the Wufeng-lower Longmaxi Formations in Well A in Zhaotong shale gas demonstration area[J]. Oil & Gas Geology, 2017, 38(5): 933-943.

References

[1] 邹才能,陶士振,侯连华,等.非常规油气地质[M].北京:地质出版社,2013:1-20. Zou Caineng,Tao Shizhen,Hou Lianhua,et al.Unconven-Tional Oil and Gas Geology[M].Beijing:Geological Pub-Lishing House,2013:1-20.
[2] 姜在兴,梁超,吴靖,等.含油气细粒沉积岩研究的几个问题[J].石油学报,2013,34(6):1031-1039. Jiang Zaixing,Liang Chao,Wu Jing,et al. Several issues in sedimnetological studies on hydracarbon-bearing fine-grained sedimentary rocks[J]. Acta Petrolei Sinica,2013,34(6):1031-1039.
[3] 赵建华,金之钧,金振奎,等.四川盆地五峰组-龙马溪组页岩岩相类型与沉积环境[J].石油学报,2016,37(5):572-586. Zhao Jianhua,Jin Zhijun,Jin Zhenkui,et al.Lithofacies types and sedimentary environment of shale in Wufeng-Longmaxi Formation,Sichuan Basion[J].Acta Petrolei Sinica,2016,37(5):572-586.
[4] 刘树根,王世玉,孙玮,等.四川盆地及其周缘五峰组-龙马溪组黑色页岩特征[J].成都理工大学学报(自然科学版),2013,40(6):621-639. Liu Shugen,Wang Shiyu,Sun Wei,et al.Characteristics of black shale in Wufeng Formation and Longmaxi Formation in Sichuan Basion and its peripheral areas[J]. Journal of Chengdu University of Technology(Science&Technology Edition),2013,40(6):621-639.
[5] 王清晨,严德天,李双建.中国南方志留系底部优质烃源岩发育的构造-环境模式[J].地质学报,2008,82(2):289-297. Wang Qinchen,Yan Detian,Li Shuangjian,et al. Tectonic-environmental model of the Lower Silurian high-quality hydrocarbon source rocks fromSouth China[J].Acta Geologica Sinica,2008,82(2):289-297.
[6] 牟传龙,周恳恳,梁薇,等.中上扬子地区早古生代烃源岩沉积环境与油气勘探[J].地质学报,2011,85(4):526-532. Mu Chuanlong,Zhou Kenken,Liang Wei,et al.Early Paleozoic Sedimentary Environment of Hydrocarbon Source Rocks in the Middle-Upper Yangtze Region and Petroleum and Gas Exploration[J]. ActaGeologica Sinica,2011,85(4):526-532.
[7] 梁狄刚,郭彤楼,边立曾,等.中国南方海相生烃成藏研究的若干新进展(三)-南方四套区域性海相烃源岩的沉积相及发育的控制因素[J].海相油气地质,2009,14(2):1-19. Liang Digang,Guo Tonglou,Bian Lizeng,et al.Some Progresses onstudies of hydrocarbon generation and accumulation in marine sedimentary regions,southern China(Part3):Controlling factors on the sedimentary facies and development of Palaeozoic marine source rocks[J].Marine Origin Petroleum Geology,2009,14(2):1-19.
[8] 董大忠,程克明,王玉满,等.中国上扬子区下古生界页岩气形成条件及特征[J].石油与天然气地质,2010,31(3):288-299,308. Dong Dazhong,Cheng Keming,Wang Yuman,et al.Forming conditions and characteristics of shale gas in the LowerPaleozoic of the Upper Yangtze region,China[J]. Oil & Gas Geology,2010,31(3):288-299,308.
[9] 邹才能,董大忠,王社教,等.中国页岩气形成机理、地质特征及资源潜力[J].石油勘探与开发,2010,37(6):641-653. Zou Caineng,Dong Dazhong,Wang Shejiao,et a1.Geological characteristics,formation mechaniasm and resource potential of shale gas in China[J]. Petroleum Exploation and Development,2010,37(6):641-653.
[10] 王祥,刘玉华,张敏,等.页岩气形成条件及成藏影响因素研究[J]. 天然气地球科学,2010,21(2):350-356. Wang Xiang,Liu Yuhua,Zhang Min,et al.Conditions of Formation and Accumulation for Shale Gas[J]. Natural Gas Geoscience,2010,21(2):350-356.
[11] 董大忠,程克明,王世谦,等.页岩气资源评价方法及其在四川盆地的应用[J].天然气工业,2009,29(5):33-39. Dong Dazhong,Cheng Keming,Wang Shiqian,et a1.An evaluation method of shale gas resource and its application in the Sichuan basin[J]. Natural Gas Industry,2009,29(5):33-39.
[12] 张琴,刘畅,梅啸寒,等.页岩气储层微观储集空间研究现状及展望[J].石油与天然气地质,2015,36(4):666-674. Zhang Qin,Liu Chang,Mei Xiaohan,et al.Status and prospect of research on microscopic shale gas reservoir space[J]. Oil & Gas Geology,2015,36(4):666-674.
[13] 郭彤楼,刘若冰.复杂构造区高演化程度海相页岩气勘探突破的启示-以四川盆地东部盆缘JY1井为例[J].天然气地球科学,2013,24(4):643-651. Guo Tonglou,Liu Ruobing.Implications form marine shale gas exploration breakthrough in complicated structural area at high thermal stage:Taking Longmaxi Formation in well JY1 as an example[J].Natural Gas Geoscience,2013,24(4):643-651.
[14] 董大忠,邹才能,戴金星,等.中国页岩气发展战略对策建议[J].天然气地球科学,2016,27(3):397-406. Dong Dazhong,Zou Caineng,Dai Jinxing,et al.Suggestions on the development strategy of shale gas inChina[J].Natural Gas Geoscie-nce,2016,27(3):397-406.
[15] 王鹏万,张磊,邹辰,等.中国西南镇雄-赫章地区筇竹寺组高演化页岩气勘探方向[J].成都理工大学学报(自然科学版),2015,42(5):530-538. Wang Pengwan,Zhang Lei,Zou Chen,et al.The exploration direction of the Qiongzhusi Group with high maturity in Zhengxiong-Hezhang area[J].Journal of Chengdu University of Technology(Science & Technology Edition),2015,42(5):530-538.
[16] 李娟,于炳松,郭峰.黔北地区下寒武统底部黑色页岩沉积环境条件与源区构造背景分析[J].沉积学报,2013,31(1):20-31. Li Juan,Yu Bingsong,Guo Feng.Depositional Setting and Tectonic Background Analysis on Lower Cambrian Black Shales in the North of Guizhou Province[J].Acta Sedimentologica Sinica,2013,31(1):20-31.
[17] 徐文礼,郑荣才,颜雪,等.下扬子地区早古生代黑色岩系地球化学特征及其地质意义[J].吉林大学学报:地球科学版,2014,44(4):1108-1122. Xu Wenli,Zhen Rongcai,Yan Xue,et a1.Trace and rare eaethelement geochemistry of the Early Paleozoic black shales in the Lower Yangtze area and its geological significances[J].Journal of Jilin University:Earth Science Edition,2014,44(4):1108-1122.
[18] 李艳芳,邵德勇,吕海刚,等.四川盆地五峰组-龙马溪组海相页岩元素地球化学特征与有机质富集的关系[J].石油学报,2015,36(12):1470-1483. Li Yanfang,Shao Deyong,Lv Haigang,et al.A relation-ship between elemental geochemical characteristics and origanicmatter enrichment in marine shale of Wufeng Formation-Longmaxi Formation,Sichuan Basin[J].Acta Petrolei Sinica,2015,36(12):1470-1483.
[19] 王鹏万,张润合,斯春松,等.滇黔川地区灯影组储层特征及其主控因素[J].西安石油大学学报(自然科学版),2014,29(6):35-41. Wang Pengwan,Zhang Runhe,Si Chunsong,et al. Reservoir characteristics of Dengying Formation in Dian-Qian-Chuan area and their control factors[J].Journal of Xi'an Shiyou University(Natural Science Edition),2014,29(6):35-41.
[20] 李双建,肖开华,沃玉进,等.中上扬子地区上奥陶统-下志留统烃源岩发育的古环境恢复[J].岩石矿物学杂志,2009,28(5):873-880. Li Shuangjian,Xiao Kaihua,Wo Yujin,et al.Palaeo-environment restoration of upper Ordovician-lower Silurian hydrocarbon source rock in middle-upper Yangtzearea[J].Acta Petrologica Et Mineralogic,2009,28(5):873-880.
[21] 陈志鹏,梁兴,张介辉,等.昭通国家级示范区龙马溪组页岩气储层超压成因浅析[J].天然气地球科学,2016,27(3):442-448. Chen Zhipeng,Liang Xing,Zhang Jiehui,et al.Genesis analysis of shale reservoir overpressure of Longmaxi Formation in Zhaotong Demonstration Area,Dianqianbei Depression[J].Nature Gas Geoscience,2016,27(3):442-448.
[22] 徐晓春,王文俊,熊亚平,等.安徽石台早寒武世黑色岩系稀土元素地球化学特征及其地质意义[J]. 岩石矿物学杂志,2009,28(2):118-128. Xu Xiaochun,Wang Wenjun,Xiong Yaping,et al.REE geochemical characteristics of the Lower Cambrian black shale series in Shitai area,Anhui Province,and their geological significance[J]. Acta Petrologica Et Mineralogic,2009,28(2):118-128.
[23] 王同,杨克明,熊亮,等.川南地区五峰组-龙马溪组页岩层序地层及其对储层的控制[J].石油学报,2015,36(8):915-925. Wang Tong,Yang Keming,Xiong Liang,et al. Shale sequence stratigraphy of Wufeng-Longmaxi Formation in southern Sichuan and their control on reservoirs[J].Acta Petrolei Sinica,2015,36(8):915-925.
[24] 熊小辉,王剑,余谦,等.富有机质黑色页岩形成环境及背景的元素地球化学反演-以渝东北地区田坝剖面五峰组-龙马溪组页岩为例[J].天然气工业,2015,35(4):25-32. Xiong Xiaohui,Wang Jian,Yu Qian,et al.Element geochemistry inversion of the environment and background of organic-rich black shale formations:A case study of the Wufeng-Longmaxi black shale in the Tianba section in northeastern Chongqing[J].Natural Gas Industry,2015,35(4):25-32.
[25] 夏威,于炳松,孙梦迪.渝东南YK1井下寒武统牛蹄塘组底部黑色页岩沉积环境及有机质富集机制[J].矿物岩石,2015,35(2):70-80. Xia Wei,Yu Bingsong,Sun Mengdi.Depositional setting and enrichment mechanism of the organic matter of the black shales of Niutitang Formation at the bottom of Lower Cambrian,in well Yuke1,sountheastChongqing[J].Journal Mineralogy and Petrology,2015,35(2):70-80.
[26] 凌斯祥,巫锡勇,任勇,等.大巴山早寒武世黑色岩层稀土元素特征及沉积环境分析[J].地质科技情报,2015,34(5):31-37. Ling Sixiang,Wu Xiyong,Ren Yong,et al.Analysis of REE geochemical characteristics and sedimentary environment of the Early Cambrian black rock strata in Daba Mountain[J].Geological Science and Technology Information,2015,34(5):31-37.
[27] 杨兴莲,朱茂炎,赵元龙,等.黔东震旦系-下寒武统黑色岩系稀土元素地球化学特征[J].地质评论,2008,54(1):3-15. Yang Xing lian,Zhu Maoyan,Zhao Yuanlong,et al.REE Geochemical Characteristics of the Ediacaran-Lower Cambrian Black Rock Series in Eastern Guizhou[J].Geological Review,2008,54(1):3-15.
[28] 赵振华.铕地球化学特征的控制因素[J].南京大学学报:地球科学版,1993,5(2):271. Zhao Zhenhua.Geochemistry control factorsof Eu[J].Journal of Nanjing University:the Earth Science Edition,1993,5(2):271.
[29] 常华进,储雪蕾.草莓状黄铁矿与古海洋环境恢复[J].地球科学进展,2011,26(5):475-481. Chang Huajin,Chu Xuelei. Pyrite framboids and palaeo-ocean redox condition reconstruction[J].Advances in Earth Science,2011,26(5):475-481.
[30] Wilkin R T,Barnes H L,Brantley S L. The size distribution of framboidal pyrite in modern sediments:An indicator of redox conditions[J].Geochimica et Cosmochimica Acta,1996,60(20):3897-3912.
[31] 徐祖新,韩淑敏,王启超.中扬子地区陡山沱组页岩储层中黄铁矿特征及其油气意义[J].岩性油气藏,2015,27(2):31-37. Xu Zuxin,Han Shumin,Wang Qichao.Characteristics of pyrite and its hydrocarbon significance of shale reservoir of Doushantuo Formation in middle Yangtze area[J].Lithologic Reservoirs,2015,27(2):31-37.
[32] Roser B,Korsch R.Provenance signatures of sandstone-mudstone suites determined using discriminant function analysis of major-element data[J].Chemical Geology,1988,67(1-2):119-139.
[33] 樊馥,蔡进功,张永生,等.泥质烃源岩有机质保存研究[J].新疆石油地质,2011,32(6):686-690. Fan Fu,Cai Jingong,Zhang Yongsheng,et al.A review of studies on organic matter preservation in muddy source rock[J].Xinjiang Petroleum Geology,2011,32(6):686-690.
[34] 孙梦迪,于炳松,夏威,等.渝东南地区下志留统底部黑色岩系沉积环境及有机质富集机制-以鹿角剖面为例[J].东北石油大学学报,2014,38(5):51-60. Sun Mengdi,Yu Bingsong,Xia Wei,et al. Depostional Setting and enrichment mechanism of organic matter of the Lower Silurian black shale series in the Southeast of Chongqiong:A case study from Lujiao outcrop section[J].Journal of Northeast Petroleun University,2014,38(5):51-60.
[35] 严德天,王清晨,陈代钊,等.扬子及周缘地区上奥陶统-下志留统烃源岩发育环境及其控制因素[J].地质学报,2008,82(3):322-327. Yan Detian,Wang Qingchen,Chen Daizhao,et al.Sedimentary environment and development controls of the hydrocarbon sources beds:the Upper Ordovician Wufeng Formation and the Lower Silurian Longmaxi Formation in the Yangtze area[J].Acta Geological Sinica,2008,82(3):322-327.
[36] 李艳芳,吕海刚,张瑜,等.四川盆地五峰组-龙马溪组页岩U-Mo协变模式与古海盆水体滞留程度的判识[J].地球化学,2015,44(2):109-116. Li Yanfang,Lv Haigang,Zhang Yu,et al.U-Mo covariation in marine shales of Wufeng-Longmaxi Formations,Sichuan Basin,China and its implication of watermass restriction[J].Geochimica,2015,44(2):109-116.

Redox conditions and organic enrichment mechanisms of black shale:A case from the Wufeng-lower Longmaxi Formations in Well A in Zhaotong shale gas demonstration area

PDF (PC)

Knowledge

Abstract

Cite this article

share this article

References

Related Articles 15

Recommended Articles

Metrics

[1]	Xiugang PU, Jiangchang DONG, Gongquan CHAI, Shunyao SONG, Zhannan SHI, Wenzhong HAN, Wei ZHANG, Delu XIE. Enrichment model of high-abundance organic matter in shales in the 2^nd member of the Paleogene Kongdian Formation， Cangdong Sag， Bohai Bay Basin [J]. Oil & Gas Geology, 2024, 45(3): 696-709.
[2]	Caineng ZOU, Dazhong DONG, Wei XIONG, Guoyou FU, Qun ZHAO, Wen LIU, Weiliang KONG, Qin ZHANG, Guangyin CAI, Yuman WANG, Feng LIANG, Hanlin LIU, Zhen QIU. Advances， challenges， and countermeasures in shale gas exploration of underexplored plays， sequences and new types in China [J]. Oil & Gas Geology, 2024, 45(2): 309-326.
[3]	Xiao HE, Maja ZHENG, Yong LIU, Qun ZHAO, Xuewen Shi, Zhenxue Jiang, Wei WU, Ya WU, Shitan NING, Xianglu TANG, Dadong LIU. Characteristics and differential origin of Qiongzhusi Formation shale reservoirs under the “aulacogen-uplift” tectonic setting， Sichuan Basin [J]. Oil & Gas Geology, 2024, 45(2): 420-439.
[4]	Changbo ZHAI, Liangbiao LIN, Donghua YOU, Fengbin LIU, Siyu LIU. Sedimentary microfacies characteristics and organic matter enrichment pattern of the 1^st member of the Middle Permian Maokou Formation， southwestern Sichuan Basin [J]. Oil & Gas Geology, 2024, 45(2): 440-456.
[5]	Yi ZHANG, Bin ZHANG, Banghua LIU, Jie LIU, Qiansheng WEI, Qi ZHANG, Hongjun LU, Pengyu ZHU, Rui WANG. Status quo and development trends of research on shale gas adsorption and seepage in shale gas reservoirs [J]. Oil & Gas Geology, 2024, 45(1): 256-280.
[6]	Guangfu WANG, Fengxia LI, Haibo WANG, Tong ZHOU, Yaxiong ZHANG, Ruyue WANG, Ning LI, Yuxin CHEN, Xiaofei XIONG. Difficulties and countermeasures for fracturing of various shale gas reservoirs in the Sichuan Basin [J]. Oil & Gas Geology, 2023, 44(6): 1378-1392.
[7]	Dongfeng HU, Zhihong WEI, Ruobing LIU, Xiangfeng WEI, Wei WANG, Qingbo WANG. Discovery of the Qijiang shale gas field in a structurally complex region on the southeastern margin of the Sichuan Basin and its implications [J]. Oil & Gas Geology, 2023, 44(6): 1418-1429.
[8]	Hongyan WANG, Shangwen ZHOU, Qun ZHAO, Zhensheng SHI, Dexun LIU, Pengfei JIAO. Enrichment characteristics， exploration and exploitation progress， and prospects of deep shale gas in the southern Sichuan Basin， China [J]. Oil & Gas Geology, 2023, 44(6): 1430-1441.
[9]	Ruikang BIAN, Chuanxiang SUN, Haikuan NIE, Zhujiang LIU, Wei DU, Pei LI, Ruyue WANG. Types， characteristics， and exploration targets of deep shale gas reservoirs in the Wufeng-Longmaxi formations， southeastern Sichuan Basin [J]. Oil & Gas Geology, 2023, 44(6): 1515-1529.
[10]	Rui ZHANG, Zhijun JIN, Rukai ZHU, Mingsong LI, Xiao HUI, Ren WEI, Xiangwu HE, Qian ZHANG. Investigation of deposition rate of terrestrial organic-rich shales in China and its implications for shale oil exploration [J]. Oil & Gas Geology, 2023, 44(4): 829-845.
[11]	Dan LYU, Huajian WANG, Gang LI, Jiangyong ZHANG, Xiuli FU, Chang LIU, Xiaomei WANG, Rukai ZHU, Shuichang ZHANG. Paleobiological evidence of the paleowater environment evolution during deposition of the Qingshankou shale in the Songliao Basin [J]. Oil & Gas Geology, 2023, 44(4): 857-868.
[12]	Tianshu ZHANG, Rukai ZHU, Yi CAI, Huajian WANG, Dan LYU, Haiyan ZHOU, Xiuli FU, Chang LIU, Kunning CUI, Surong ZHANG, Bo WANG, Songtao WU, Jingya ZHANG, Xiaohua JIANG, Youliang FENG, He LIU. Distribution of organic matter in the Qingshankou Formation Shale， Gulong Sag， Songliao Basin observed within an isochronous sequence stratigraphic framework [J]. Oil & Gas Geology, 2023, 44(4): 869-886.
[13]	Jianxiang PEI, Xiaoxiao GUO, Haitao XUE, Yangyu WU, Shanshan LI, Wenhao LI. Environment and controlling factors of the Miocene marine source rocks in the Yinggehai Basin [J]. Oil & Gas Geology, 2023, 44(4): 937-945.
[14]	Dongjun FENG. Sweet spot assessment and its significance for the marine-continental transitional shale gas of Permian Longtan Fm. in southeastern Sichuan Basin [J]. Oil & Gas Geology, 2023, 44(3): 778-788.
[15]	Guangfu Wang, Fengxia Li, Haibo Wang, Jun Li, Hong Zhang, Tong Zhou, Xiaofei Shang, Linhua Pan, Yunqi Shen. Application of an integrated geology-reservoir engineering approach to fracturing in unconventional gas reservoirs， Sichuan Basin and some insights [J]. Oil & Gas Geology, 2022, 43(5): 1221-1237.