Origins and significance of siliceous minerals in the shale reservoirs of the Wufeng-Longmaxi Formation in the Zheng'an area, northern Guizhou
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摘要:
我国南方地区早古生代海相富有机质页岩硅质矿物含量较高，其成因和来源对页岩储层物性和压裂改造效果至关重要。本文以黔北正安地区五峰组—龙马溪组页岩为研究对象，通过岩心和薄片观察、X衍射分析、场发射扫描电镜及主微量元素分析等技术方法，精细识别不同类型硅质矿物的结构，定量计算不同来源硅质矿物的含量，探讨不同成因硅质矿物对页岩孔隙和压裂改造的影响。结果表明：研究区五峰组—龙马溪组页岩硅质矿物含量较高（约为71.5%），主要为石英，多呈棱角状和椭圆状等形态，颗粒大小和结晶程度存在明显差异，反映陆源和生源两种成因，其中生物成因硅含量约为41.4%，陆源碎屑硅含量约为30.1%。相比于焦石坝地区，研究区五峰组—龙马溪组页岩硅质矿物含量较高，主要表现在碎屑硅含量的增加，生物成因硅含量相差不大。生物成因硅在沉积和成岩过程中，可以形成刚性颗粒支撑结构，有利于页岩储层的保存和压裂改造，而陆源碎屑硅对页岩脆性和压裂改造不利。因此，尽管研究区页岩硅质矿物含量总体较高，但在页岩储层物性和压裂改造效果方面不及焦石坝等地区。
Abstract:Siliceous minerals, highly enriched in the organic shales of the early Paleozoic in South China, play a significant role in the development of shale reservoirs and volume fracturing. This study takes the shales of the Wufeng-Longmaxi Formation in the Zheng'an area of northern Guizhou as the research subject, utilizing a variety of methods and technologies, including rock and thin section observation, x-ray diffraction analysis, scanning electron microscopy (SEM) analysis as well as major and trace element analysis. Therethrough, we have identified the structure of different types of siliceous minerals, quantitatively measured their content, and deeply explored their influence on the development of porosity in the shales and fracturing reconstruction. Results show that siliceous minerals, enriched in shale reservoirs of the research area, are mostly composed of quartz of elliptical and irregular shape. The minerals vary in grain size and degree of crystallization, revealing their origins from two sources of terrigenous and biogenic respectively, in which terrigenous silica accounts for 30.1%, while biogenic silica accounts for 41.4%. Comparatively, siliceous minerals content in the shales of the Wufeng-Longmaxi Formation in the research area is higher than that in the Jiaoshiba of central Chongqing. The increase is predominantly due to a high amount of terrigenous, while the content of biological quartz varies scarcely. Biogenic silica forms a rigid structure during sedimentation and diagenesis, which facilitates the preservation and later fracturing reconstruction of the shale reservoirs. In contrast, the presence of terrigenous silica has the opposite effect. Thus, although the overall content of siliceous minerals in the shale of the research area is high, the conditions for forming optimal reservoir physical properties and subsequent fracturing reconstruction are less favorable than those in the Jiaoshiba area of central Chongqing.
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图 6 陆源石英与生源石英典型特征对比（据Dong et al., 2017）
Figure 6.
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[1] Bhatia M R,Crook K A W,1986. Trace element characteristics of graywackes and tectonic setting discrimination of sedimentary basins[J]. Contributions to mineralogy and petrology,92(2):181 − 193. doi: 10.1007/BF00375292
[2] 蔡全升,陈孝红,张保民,等,2020. 鄂西宜昌地区五峰组——龙马溪组黑色岩系硅质来源及其油气地质意义[J]. 地质学报,94(03):931 − 946. doi: 10.3969/j.issn.0001-5717.2020.03.018
Cai Q S,Chen X H,Zhang B M,et al.,2020. Origin of siliceous minerals in the black shale of the Wufeng and Longmaxi Formations in the Yichang area,western Hubei Province:geological significance for shale gas[J]. Acta Geological Sinica,94(03):931 − 946 (in Chinese with English abstract). doi: 10.3969/j.issn.0001-5717.2020.03.018
[3] 陈桂华,白玉湖,陈晓智,等,2016. 页岩油气纵向综合甜点识别新方法及定量化评价[J]. 石油学报,37(11):1337 − 1360. doi: 10.7623/syxb201611002
Chen G H,Bai Y H,Chen X Z,et al.,2016. A new identification method for the longitudinal integrated shale oil/gas sweet spot and its quantitative evaluation[J]. Acta Petrolei Sinica,37(11):1337 − 1360 (in Chinese with English abstract). doi: 10.7623/syxb201611002
[4] Dong T,Harris N B,Ayranci K,et al.,2017. The impact of rock composition on geomechanical properties of a shale formation: Middle and Upper Devonian Horn River Group shale, Northeast British Columbia, Canada[J]. AAPG Bulletin,101(02):177 − 204. doi: 10.1306/07251615199
[5] Dong T,He S,Chen M F,et al.,2019. Quartz types and origins in the paleozoic Wufeng-Longmaxi Formations,Eastern Sichuan Basin,China:Implications for porosity preservation in shale reservoirs[J]. Marine and Petroleum Geology 106:62 − 73.
[6] 冯伟明,赵瞻,李嵘,等,2020. 滇东北DD1井五峰−龙马溪组页岩气地质特征及其勘探启示[J]. 沉积与特提斯地质,40(4):17 − 24.
Feng W M,Zhao Z,Li R,et al.,2020. Geological characteristics of shale gas of the Wufeng Fm-Longmaxi Fm in DD1 well in Northeast Yunnan and their exploration significances[J]. Sedimentary Geology and Tethyan Geology,40(4):17 − 24 (in Chinese with English abstract).
[7] Ferreiro M R,Frey M. 2012. Standardisation, calibration and correlation of the Kübler-index and the vitrinite/bituminite reflectance: an inter-laboratory and field related study[J]. Swiss Journal of Geosciences,105(2):153 − 170.
[8] 何建华,丁文龙,王哲,等,2015. 页岩储层体积压裂缝网形成的主控因素及评价方法[J]. 地质科技情报,34(04):108 − 118.
He J H,Ding W L,Wang Z,et al.,2015. Main Controlling Factors of Fracture Network Formation of Volume Fracturing in Shale Reservoirs and Its Evaluation Method[J]. Geological Science and Technology Information,34(04):108 − 118 (in Chinese with English abstract).
[9] Jarvie D M,Hill R J,Ruble T E,et al., 2007. Unconventional shale-gas systems:The Mississippian Barnett Shale of north-central Texas as one model for thermogenic shale-gas assessment[J]. AAPG bulletin,91(4):475 − 499.
[10] 雷子慧,赵安坤,余谦,等,2016. 贵州北部安场向斜下志留统龙马溪组页岩气保存条件[J]. 地质科技情报,35(04):121 − 127.
Lei Z H,Zhao A K,Yu Q,et al.,2015. Preservation of Shale Gas in Lower Silurian Longmaxi Formation in Anchang Syncline Unit in Northern Guizhou,South China[J]. Geological Science and Technology Information,35(04):121 − 127 (in Chinese with English abstract).
[11] 李桃,杨贵来,何伟,等,2021. 西昌盆地五峰组—龙马溪组页岩气保存条件研究[J]. 沉积与特提斯地质,41(3):465 − 476.
Li T,Yang G L,He W,et al.,2021. Preservation condition for shale gas of Wufeng-Longmaxi Formations in Xichang Basin[J]. Sedimentary Geology and Tethyan Geology,41(3):465 − 476 (in Chinese with English abstract).
[12] 林良彪,陈洪德,朱利东,2010. 川东茅口组硅质岩地球化学特征及成因[J]. 地质学报,84(04):500 − 507.
Lin L B,Chen H D,Zhu L D,et al.,2010. The Origin and Geochemical Characteristics of Maokou Formation Silicalites in the Eastern Sichuan Basin[J]. Acta Geological Sinica,84(04):500 − 507 (in Chinese with English abstract).
[13] 刘江涛,李永杰,张元春,等,2020. 焦石坝五峰组−龙马溪组页岩硅质生物成因的证据及其地质意义[J]. 中国石油大学学报(自然科学版),41(01):34 − 41. doi: 10.3969/j.issn.1673-5005.2020.01.004
Liu J T,Li Y J,Zhang Y C,et al.,2020. Evidences of biogenic silica of Wufeng-Longmaxi Formation shale in Jiaoshiba area and its geological significance[J]. Journal of China University of Petroleum,41(01):34 − 41 (in Chinese with English abstract). doi: 10.3969/j.issn.1673-5005.2020.01.004
[14] 马文辛,2020. 渝东地区震旦系灯影组硅质岩特征及成因研究[D]. 成都:成都理工大学.
Ma W X,2020. Study on the Characteristics and Formation Mechanism of Upper Sinian Dengying Formation Chert in East Chongqing[D]. Chengdu:Chengdu University of Technology (in Chinese with English abstract).
[15] 苗凤彬,彭中勤,汪宗欣,等,2020. 雪峰隆起西缘下寒武统牛蹄塘组页岩裂缝发育特征及主控因素[J]. 地质科技通报,39(02):31 − 42.
Miao F B,Peng Z Q,Wang Z X,et al.,2020. Development characteristics and major controlling factors of shale fractures in the Lower Cambrian Niutitang Formation,western margin of Xuefeng Uplift[J]. Geological Science and Technology Information,39(02):31 − 42 (in Chinese with English abstract).
[16] 梅廉夫,戴少武,沈传波等,2008. 中、下扬子区中、新生代陆内对冲带的形成及解体[J]. 地质科技情报,27(04):1 − 7,14.
Mei L F,Dai S W,Shen C B,et al.,2008. Temporal and Spatial Configuration of Sedimentary Systems and Sequence Stratigraphic Framework of Sangonghe Formation in Bohu Depression of Yanqi Basin[J]. Geological Science and Technology Information,27(04):1 − 7,14 (in Chinese with English abstract).
[17] Ross D J K,Bustin R M,2009. Investigating the use of sedimentary geochemical proxies for paleoenvironment interpretation of thermally mature organic-rich strata:Examples from the Devonian–Mississippian shales,Western Canadian Sedimentary Basin[J]. Chemical Geology,260(1-2):1 − 19. doi: 10.1016/j.chemgeo.2008.10.027
[18] Taylor S R,McLennan S M,1986. The continental crust:Its composition and evolution[J]. Geological Journal,21(1):85 − 86. doi: 10.1002/gj.3350210116
[19] Turgeon S,Brumsack H J,2006. Anoxic vs dysoxic events reflected in sediment geochemistry during the Cenomanian–Turonian Boundary Event (Cretaceous) in the Umbria–Marche Basin of central Italy[J]. Chemical Geology,234(3-4):321 − 339. doi: 10.1016/j.chemgeo.2006.05.008
[20] 文虎,2021. 四川盆地焦石坝地区五峰组—龙马溪组底部硅质成因及古环境分析[J]. 天然气勘探与开发,44(02):87 − 92.
Wen H. 2021. Origin and paleoenvironment of Siliceous at the bottom of Longmaxi-Wufeng Formation,Jiaoshiba area,Sichuan Basin [J]. Natural Gas Exploration and Development,44(02):87 − 92 (in Chinese with English abstract).
[21] 邱振,谈昕,卢斌,等,2018. 四川盆地巫溪地区五峰组−龙马溪组硅质岩地球化学特征[J]. 矿物岩石地球化学通报,37(05):880 − 887.
Qiu Z,Tan X,Lu B,et al.,2018. Geochemical Characteristics of Cherts from the Wufeng and Longmaxi Formations in the Wuxi Area, Sichuan Basin[J]. Bulletin of Mineralogy,Petrology and Geochemistry,37(05):880 − 887 (in Chinese with English abstract).
[22] 王淑芳,邹才能,董大忠,等 2014. 四川盆地富有机质页岩硅质生物成因及对页岩气开发的意义[J]. 北京大学学报(自然科学版),50(03):476 − 486.
Wang S F,Zou C N,Dong D Z,et al.,2014. Biogenic Silica of Organic-Rich Shale in Sichuan Basin and Its Significance for Shale Gas[J]. Acta Scientiarum Naturalium Universitatis Pekinensis,50(03):476 − 486 (in Chinese with English abstract).
[23] 吴小力,李荣西,李尚儒,等,2018. 下扬子地区海陆过渡相页岩气成藏条件与主控因素:以萍乐坳陷二叠系乐平组为例[J]. 地质科技情报,37(01):160 − 168.
Wu X L,Li R X,Li S R,et al.,2018. Accumulation Conditions and Main Factors of Marine-Continental Transitional Shale Gas in the Lower Yangtze Area of China:A Case of Permian Leping Formation in the Pingle Depression[J]. Geological Science and Technology Information,37(01):160 − 168 (in Chinese with English abstract).
[24] Xi Z D,Tang S H,Zhang S H,et al.,2019. Characterization of quartz in the Wufeng Formation in northwest Hunan Province,south China and its implications for reservoir quality[J]. Journal of Petroleum Science and Engineering,179:979 − 996. doi: 10.1016/j.petrol.2019.04.051
[25] 杨文强,冯庆来,刘桂春,2010. 滇西北甘孜−理塘构造带放射虫地层、硅质岩地球化学及其构造古地理意义[J]. 地质学报,84(1):78 − 89.
Yang W Q,Feng Q L,Liu G C,2010. Radiolarian Fauna and Geochemical Characters of the Cherts from Garz-Litang Tectonic Belt and Its Tectono-Paleogeographic Significance[J]. Acta Geologica Sinica,84(1):78 − 89 (in Chinese with English abstract).
[26] 翟刚毅,包书景,庞飞,等,2017. 贵州遵义地区安场向斜“四层楼”页岩油气成藏模式研究[J]. 中国地质,44(01):1 − 12.
Zhai G Y,Bao S J,Pang F,et al.,2017. Peservoir-forming pattern of "four-storey" hydrocarbon accumulation in Anchang syncline of northern Guizhou Province[J]. Geology in China,44(01):1 − 12 (in Chinese with English abstract).
[27] 张晨晨,王玉满,董大忠,等,2016. 四川盆地五峰组—龙马溪组页岩脆性评价与“甜点层”预测[J]. 天然气工业,36(09):51 − 60.
Zhang C C,Wamg Y M,Dong D Z,et al.,2016. Evaluation of the Wufeng-Longmaxi shale brittleness and prediction of "sweet spot layers" in the Sichuan Basin[J]. Natural Gas Industry,36(09):51 − 60 (in Chinese with English abstract).
[28] 张福,黄艺,蓝宝锋,等,2021. 正安地区五峰组−龙马溪组页岩储层特征及控制因素[J]. 地质科技通报,40(01):49 − 56.
Zhang F,Huang Y,Lan B F,et al.,2021. Characteristics and controlling factors of shale reservoir in Wufeng Formation-Longmaxi Formation of the Zheng'an area[J]. Geological Science and Technology Information,40(01):49 − 56 (in Chinese with English abstract).
[29] 张号,吴翔,何俊,等,2019. 鄂西咸丰地区上奥陶统五峰组−下志留统龙马溪组页岩非均质性特征[J]. 中国煤炭地质,31(z1):38 − 46,112.
Zhang H,Wu X,He J,et al.,2019. Anisotropic Features of Shale in Wufeng Formation Longmaxi Formation in Xianfeng Area,Western Hubei[J]. Coal Geology of China,31(z1):38 − 46,112 (in Chinese with English abstract).
[30] 张浩然,姜华,陈志勇,等,2020. 四川盆地及周缘地区加里东运动幕次研究现状综述[J]. 地质科技通报,39(05):118 − 126.
Zhang H R,Jiang H,Chen Z Y,et al.,2020. A review of the research status of Caledonian movement stages in Sichuan Basin and surrounding areas[J]. Geological Science and Technology Information,39(05):118 − 126 (in Chinese with English abstract).
[31] 张位华,姜立君,高慧,等,2003. 贵州寒武系底部黑色硅质岩成因及沉积环境探讨[J]. 矿物岩石地球化学通报,22(02):174 − 178. doi: 10.3969/j.issn.1007-2802.2003.02.020
Zhang W H,Jiang L J,Gao H,et al.,2003. Study on Sedimentary Environment and Origin of Black Siliceous Rocks of the Lower Cambrian in Giuzhou Province[J]. Bulletin of Mineralogy Petrology and Geochemistry,22(02):174 − 178 (in Chinese with English abstract). doi: 10.3969/j.issn.1007-2802.2003.02.020
[32] 张岩,漆富成,陈文,等,2017. 扬子板块北缘早—中志留世硅质岩成因及古沉积环境的地球化学研究[J]. 地质学报,91(10):2322 − 2350. doi: 10.3969/j.issn.0001-5717.2017.10.013
Zhang Y,Qi F C,Chen W,et al.,2017. Origin and Paleodepositional Environment of the Early-Middle Silurian Bedded Chert on the Northern Margin of the Yangtze Block: Evidence from Geochemical Study[J]. Acta Geological Sinica,91(10):2322 − 2350 (in Chinese with English abstract). doi: 10.3969/j.issn.0001-5717.2017.10.013
[33] 赵圣贤,杨跃明,张鉴,等,2016. 四川盆地下志留统龙马溪组页岩小层划分与储层精细对 比[J]. 天然气地球科学,27(03):470 − 487.
Zhao S X,Yang Y M,Zhang J,et al.,2016. Micro-layers division and fine reservoirs contrast of Lower Silurian Longmaxi Formation shale,Sichuan Basin,SW China[J]. Natural Gas Geoscience,27(03):470 − 478 (in Chinese with English abstract).
[34] 赵志强,贺同军,孙小浩,等,2019. 王世伟. 贵州印江县铁厂村老堡组硅质岩地球化学特征及沉积环境探讨[J]. 沉积与特提斯地质,39(3):48 − 54.
Zhao Z Q,He T J,Sun X H,et al.,Geochemistry and sedimentary environments of the siliceous rocks from the Sinian-Lower Cambrian Laobao Formation in Tiechang,Yinjiang,Guizhou:An approach[J]. Sedimentary Geology and Tethyan Geology,39(3):48 − 54 (in Chinese with English abstract).
[35] 周业鑫,赵安坤,余谦,等,2021. 基于多元线性回归分析的页岩气有利区评价新方法——以上扬子地区五峰组—龙马溪组海相页岩为例[J]. 沉积与特提斯地质,41(3):387 − 397.
Zhou Y X,Zhao A k,Yu Q,et al.,A new method for evaluating favorable shale gas exploration areas based on multi-linear regression analysis:A case study of marine shales of Wufeng-Longmaxi Formations,Upper Yangtze Region[J]. Sedimentary Geology and Tethyan Geology,41(3):387 − 397 (in Chinese with English abstract).
[36] 朱杰,杜远生,2007. 北祁连造山带老虎山奥陶系硅质岩地球化学特征及古地理意义[J]. 古地理学报,9(1):69 − 76. doi: 10.3969/j.issn.1671-1505.2007.01.007
Zhu J,Du Y S,2007. Geochemistry characteristics and palaeogeographic significance of the Ordovician siliceous rocks from Laohushan area,North Qilian orogenic belt[J]. Journal of Palaeogeography,9(1):69 − 76 (in Chinese with English abstract). doi: 10.3969/j.issn.1671-1505.2007.01.007
[37] 朱嗣昭,Hiromi N,Masao K,等,1999. 一种特殊类型硅质岩—浮石状燧石[J]. 高校地质学报,5(3):345 − 350.
Zhu S Z,Hiromi N,Masao K,et al.,1999. Nectic Chert,a very peculiar type of siliceous rock[J]. Geological Journal of China Universities,5(3):345 − 350 (in Chinese with English abstract).
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