Sedimentary characteristics of the upper part of the fourth member of Leikoupo Formation of Middle Triassic in western Sichuan Basin
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摘要: 利用野外露头、钻井岩心、测井、岩石薄片以及碳氧同位素等资料，对川西地区中三叠统雷口坡组四段上亚段沉积特征与沉积模式进行系统分析，明确储层发育有利沉积相带。川西地区中三叠统雷口坡组四段上亚段沉积时期主要为局限—蒸发台地潮坪沉积环境，发育膏云坪、（藻）云坪、（藻）云灰坪、（藻）灰云坪、（藻）砂屑滩、（藻）灰坪、砂屑滩等沉积微相。通过沉积模式的建立，认为川西地区雷四段上亚段沉积时受滩/岛的阻隔及干旱气候条件等因素影响，海水补给受限，在强蒸发作用下海水逐渐咸化，形成高盐度的沉积环境，有利于大规模白云岩化；川西地区地势平坦、水体浅、能量低，多期频繁的暴露引起了大气水淋滤溶蚀作用；藻类广泛发育，藻类活动所形成的碳酸盐岩类型多样，主要有藻叠层白云岩、藻凝块白云岩、藻纹层白云岩和藻砂屑白云岩等。综合分析认为，川西大部分地区在该时期为潮间带（藻）云坪微相沉积，有利于准同生期暴露并接受大气水淋滤溶蚀，是孔隙型储层发育的有利区带。Abstract: Based on the data of outcrop, drilling core, logging, rock thin section and carbon and oxygen isotope test, this paper carried out systematic analysis for characteristics and model of sedimentary of the upper part of the fourth member of Leikoupo Formation in western Sichuan Basin, favorable sedimentary facies for the development of reservoir were proposed. Results showed that in the sedimentary period of the upper part of the fourth member of the Middle Triassic Leikoupo Formation, the western Sichuan Basin was in the sedimentary environment of tidal flat within restricted and evaporative platform. The sedimentary microfacies were gypseous-dolomite flat, (algae)-dolomite flat, (algae)-dolomite-lime flat, (algae)-lime-dolomite flat, (algae) intraclast beach, (algae)-lime flat, intraclast beach etc. According to the establishment of the sedimentary model, due to the barrier of beach/island and the influence of arid climate conditions, the seawater supply was limited during the deposition of the upper submember of the fourth member of Leikoupo Formation in the western Sichuan Basin, which formed a high salinity sedimentary environment by strong evaporation and was good for large-scale dolomization. Flat terrain, shallow water, low energy, and the frequent exposure of multiple periods caused atmospheric water leaching and dissolution in the western Sichuan region. Algae were widely developed, which formed diverse carbonatite by algal activities, including algal stromatolite dolomite, algal clot dolomite, algal lamina dolomite and algal arene dolomite. By comprehensive analysis, for most part of the western Sichuan Basin, it was in the intertidal zone (algae)-dolomite flat sedimentary area, which was favorable for the penecontemporaneous exposure to atmospheric water leaching and dissolution, and was a favorable developing zone for porous-type reservoir.
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图 1 四川盆地晚三叠世前古地质图及地层划分方案
Figure 1. Paleogeological map of the Sichuan Basin before the Late Triassic and its stratigraphic division scheme
图 2 川西地区X6井中三叠统雷口坡组四段上亚段沉积特征综合柱状图
Figure 2. Comprehensive histogram of sedimentary characteristics of the upper sub-member of the fourth member of Middle Triassic Leikoupo Formation in well X6, western Sichuan Basin
图 3 川西地区中三叠统雷口坡组四段上亚段典型沉积微相的岩石特征
a.膏质团块，潮上带膏云坪，F1井，4 589 m; b.藻纹层状白云岩，潮间带藻云坪绵竹汉旺剖面; c.藻纹层白云岩，潮间带藻云坪，X6井，5 779.81 m; d.藻叠层白云岩，潮间带藻云坪X7井，6 217.69 m，100(-); e.藻凝块白云岩，潮间带藻云坪，X6井，5 814.59 m，100(-); f.鸟眼构造，潮间带(藻)云坪，X7井，6 208.24 m; g.鸟眼—窗格构造，潮间带藻云坪，X6井，5 787.04 m，100(-); h.干裂纹，潮间带云坪，绵竹汉旺剖面; i.灰质白云岩，潮间带灰云坪，波状层理，X6井，5 781.38 m; j.砂屑白云岩，潮间带砂屑滩，X6井，5 791.87 m，100(-); k.亮晶藻砂屑灰岩，潮下带砂屑滩，X6井，5 601 m，100(+); l.微晶灰岩，潮下带灰坪，X7井，5 738.62 m，100(+)
Figure 3. Rock characteristics of typical sedimentary microfacies in the upper sub-member of the fourth member of Middle Triassic Leikoupo Formation in western Sichuan Basin
图 4 川西地区中三叠统雷口坡组四段上亚段沉积模式
Figure 4. Sedimentary model of the upper sub-member of the fourth member of Middle Triassic Leikoupo Formation in western Sichuan Basin
图 5 川西地区中三叠统雷口坡组四段上亚段沉积微相对比
Figure 5. Microfacies of the upper sub-member of the fourth member of Middle Triassic Leikoupo Formation in western Sichuan Basin
图 6 川西地区中三叠统雷口坡组四段上亚段下部沉积微相
Figure 6. Sedimentary microfacies of the lower part of the upper sub-member of the fourth member of Middle Triassic Leikoupo Formation in western Sichuan Basin
图 7 川西地区中三叠统雷口坡组四段上亚段中—上部沉积微相
Figure 7. Sedimentary microfacies of the middle-upper part of the upper sub-member of the fourth member of Middle Triassic Leikoupo Formation in western Sichuan Basin
表 1 川西地区中三叠统雷口坡组四段上亚段沉积相划分
Table 1. Division of sedimentary facies of the upper sub-member of the fourth member of Middle Triassic Leikoupo Formation in western Sichuan Basin
相 亚相 微相 岩石类型 沉积构造 局限—蒸发台地 潮坪 膏云坪 含膏白云岩 透镜状 云膏坪 含云膏岩 团块状 泥质/云质潟湖 泥质膏岩、云质膏岩 水平层理 (藻)云坪 晶粒白云岩、藻白云岩、藻粘结白云岩 纹层状、鸟眼、窗状孔、干裂、藻纹层构造 (藻)云灰坪 云质灰岩、藻砂屑云质灰岩 波状层理 (藻)灰云坪 灰云质岩、藻砂屑灰质云岩 波状层理、藻叠层构造、藻纹层构造 (藻)砂屑滩 藻砂屑、砂屑灰岩 羽状交错层理 (藻)灰坪 藻灰岩 平行层理 潮道 藻砂屑、砂屑灰岩 羽状交错层理 潟湖 灰质潟湖 泥质灰岩、泥灰岩 平行层理 
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表 2 川西地区M1井中三叠统雷口坡组四段上亚段碳酸盐岩碳氧同位素分析
Table 2. Carbon and oxygen isotope analysis data of carbonate rock in the upper sub-member of the fourth member of Middle Triassic Leikoupo Formation in well M1, western Sichuan Basin
样品号 井深/m 岩性 δ13CV-PDB/‰ δ18OV-PDB/‰ Z值 1 6 152.14 微晶云质藻灰岩 1.94 -5.75 128.41 2 6 153.12 微晶藻砂屑灰岩 1.96 -5.66 128.50 3 6 157.50 微晶藻砂屑灰岩 1.88 -6.01 128.16 4 6 158.42 粉晶白云质藻砂屑灰岩 1.64 -5.63 127.86 5 6 160.70 微晶藻灰岩 1.70 -5.41 128.09 6 6 178.23 粉晶白云质藻灰岩 1.75 -5.54 128.13 7 6 198.78 灰质藻白云岩 2.84 -3.55 131.35 8 6 204.58 藻屑白云岩 2.36 -1.63 131.32 9 6 206.77 藻屑白云岩 2.22 -1.36 131.17 10 6 212.57 泥晶白云岩 2.27 -0.75 131.58 注：Z=2.048×(δ13C + 50) + 0.498×(δ18O + 50)。
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[1] 马永生. 四川盆地普光超大型气田的形成机制[J]. 石油学报, 2007, 28(2): 9-14. https://www.cnki.com.cn/Article/CJFDTOTAL-SYXB200702001.htmMA Yongsheng. Generation mechanism of Puguang Gas Field in Sichuan Basin[J]. Acta Petrolei Sinica, 2007, 28(2): 9-14. https://www.cnki.com.cn/Article/CJFDTOTAL-SYXB200702001.htm [2] 郭彤楼. 元坝气田成藏条件及勘探开发关键技术[J]. 石油学报, 2019, 40(6): 748-760. https://www.cnki.com.cn/Article/CJFDTOTAL-SYXB202201011.htmGUO Tonglou. Gas accumulation conditions and key exploration & development technologies in Yuanba gas field[J]. Acta Petrolei Sinica, 2019, 40(6): 748-760. https://www.cnki.com.cn/Article/CJFDTOTAL-SYXB202201011.htm [3] 杜金虎, 邹才能, 徐春春, 等. 川中古隆起龙王庙组特大型气田战略发现与理论技术创新[J]. 石油勘探与开发, 2014, 41(3): 268-277. https://www.cnki.com.cn/Article/CJFDTOTAL-SKYK201403005.htmDU Jinhu, ZOU Caineng, XU Chunchun, et al. Theoretical and technical innovations in strategic discovery of a giant gas field in Cambrian Longwangmiao Formation of central Sichuan paleo-uplift, Sichuan Basin[J]. Petroleum Exploration and Development, 2014, 41(3): 268-277. https://www.cnki.com.cn/Article/CJFDTOTAL-SKYK201403005.htm [4] 任杰, 田永敏, 王军, 等. 普光气田礁滩相储层特征及分类评价[J]. 断块油气田, 2020, 27(5): 579-584. https://www.cnki.com.cn/Article/CJFDTOTAL-DKYT202005010.htmREN Jie, TIAN Yongmin, WANG Jun, et al. The characteristics and classification evaluation of reef-shoal facies reservoir in Puguang Gas Field[J]. Fault-Block Oil and Gas Field, 2020, 27(5): 579-584. https://www.cnki.com.cn/Article/CJFDTOTAL-DKYT202005010.htm [5] 董庆民, 胡忠贵, 蔡家兰, 等. 层序地层与同位素地球化学响应特征及礁滩发育模式: 以川东城口-鄂西海槽边缘带长兴组为例[J]. 石油实验地质, 2019, 41(2): 243-250. doi: 10.11781/sysydz201902243DONG Qingmin, HU Zhonggui, CAI Jialan, et al. Sequence stratigraphy and isotope geochemical response and development pattern of reef and shoal: a case study of Changxing Formation in the marginal zone of Eastern Sichuan Chengkou-Western Hubei Oceanic Trough[J]. Petroleum Geology & Experiment, 2019, 41(2): 243-250. doi: 10.11781/sysydz201902243 [6] 辛勇光, 周进高, 倪超, 等. 四川盆地中三叠世雷口坡期障壁型碳酸盐岩台地沉积特征及有利储集相带分布[J]. 海相油气地质, 2013, 18(2): 1-7. https://www.cnki.com.cn/Article/CJFDTOTAL-HXYQ201302003.htmXIN Yongguang, ZHOU Jingao, NI Chao, et al. Sedimentary facies features and favorable lithofacies distribution of Middle Triassic Leikoupo barriered carbonate platform in Sichuan Basin[J]. Marine Origin Petroleum Geology, 2013, 18(2): 1-7. https://www.cnki.com.cn/Article/CJFDTOTAL-HXYQ201302003.htm [7] 吕玉珍, 倪超, 张建勇, 等. 四川盆地中三叠统雷口坡组有利沉积相带及岩相古地理特征[J]. 海相油气地质, 2013, 18(1): 26-32. https://www.cnki.com.cn/Article/CJFDTOTAL-HXYQ201301006.htmLÜ Yuzhen, NI Chao, ZHANG Jianyong, et al. Favorable sedimentary facies zones and lithofacies palaeogeography of Middle Triassic Leikoupo Formation in Sichuan Basin[J]. Marine Origin Petroleum Geology, 2013, 18(1): 26-32. https://www.cnki.com.cn/Article/CJFDTOTAL-HXYQ201301006.htm [8] 李凌, 谭秀成, 丁熊, 等. 四川盆地雷口坡组台内滩与台缘滩沉积特征差异及对储层的控制[J]. 石油学报, 2011, 32(1): 70-76. https://www.cnki.com.cn/Article/CJFDTOTAL-SYXB201101011.htmLI Ling, TAN Xiucheng, DING Xiong, et al. Difference in depositional characteristics between intra-platform and marginal-platform shoals in Leikoupo Formation, Sichuan Basin and its impact on reservoirs[J]. Acta Petrolei Sinica, 2011, 32(1): 70-76. https://www.cnki.com.cn/Article/CJFDTOTAL-SYXB201101011.htm [9] 黄东, 袁家林, 沈浩, 等. 四川盆地中三叠统雷口坡组雷三、雷四段盐岩沉积环境与成因研究[J]. 盐湖研究, 2014, 22(1): 6-11. https://www.cnki.com.cn/Article/CJFDTOTAL-YHYJ201401003.htmHUANG Dong, YUAN Jialin, SHEN Hao, et al. Triassic Leikoupo Formation of T2l3, T2l4 salt sedimentary environment and genesis study in Sichuan Basin[J]. Journal of Salt Lake Research, 2014, 22(1): 6-11. https://www.cnki.com.cn/Article/CJFDTOTAL-YHYJ201401003.htm [10] 许国明, 宋晓波, 冯霞, 等. 川西地区中三叠统雷口坡组天然气勘探潜力[J]. 天然气工业, 2013, 33(8): 8-14. https://www.cnki.com.cn/Article/CJFDTOTAL-TRQG201308003.htmXU Guoming, SONG Xiaobo, FENG Xia, et al. Gas potential of the Middle Triassic Leikoupo Fm in the western Sichuan Basin[J]. Natural Gas Industry, 2013, 33(8): 8-14. https://www.cnki.com.cn/Article/CJFDTOTAL-TRQG201308003.htm [11] 徐国盛, 陈美玲, 刘为, 等. 川西地区雷口坡组岩相古地理与富钾卤水预测[J]. 矿床地质, 2012, 31(2): 309-322. https://www.cnki.com.cn/Article/CJFDTOTAL-KCDZ201202012.htmXU Guosheng, CHEN Meiling, LIU Wei, et al. Lithofacies palaeogeography and forecast of potassium-rich brine of Leikoupo Formation in western Sichuan[J]. Mineral Deposits, 2012, 31(2): 309-322. https://www.cnki.com.cn/Article/CJFDTOTAL-KCDZ201202012.htm [12] 张劲超, 赵晨露, 杜浩坤, 等. 川西雷口坡组滩体沉积相研究[J]. 长江大学学报(自科版), 2013, 10(10): 4-6. https://www.cnki.com.cn/Article/CJFDTOTAL-CJDL201310003.htmZHANG Jinchao, ZHAO Chenlu, DU Haokun, et al. On sedimentary facies of shoal of Leikoupo Formation in west Sichuan Basin[J]. Journal of Yangtze University(Natural Science Edition), 2013, 10(10): 4-6. https://www.cnki.com.cn/Article/CJFDTOTAL-CJDL201310003.htm [13] 曾德铭, 王兴志, 张帆, 等. 四川盆地西北部中三叠统雷口坡组储层研究[J]. 古地理学报, 2007, 9(3): 253-266. https://www.cnki.com.cn/Article/CJFDTOTAL-GDLX200703003.htmZENG Deming, WANG Xingzhi, ZHANG Fan, et al. Study on reservoir of the Leikoupo Formation of Middle Triassic in northwestern Sichuan Basin[J]. Journal of Palaeogeography, 2007, 9(3): 253-266. https://www.cnki.com.cn/Article/CJFDTOTAL-GDLX200703003.htm [14] 辛勇光, 郑兴平, 周进高, 等. 四川盆地中西部地区雷口坡组三3亚段储层特征及其分布[J]. 天然气工业, 2013, 33(3): 5-9. https://www.cnki.com.cn/Article/CJFDTOTAL-TRQG201303004.htmXIN Yongguang, ZHENG Xingping, ZHOU Jingao, et al. Characteristics and distribution of reservoirs in the Lei-33 of the Leikoupo Formation in the western central Sichuan Basin[J]. Natural Gas Industry, 2013, 33(3): 5-9. https://www.cnki.com.cn/Article/CJFDTOTAL-TRQG201303004.htm [15] 陈安清, 杨帅, 陈洪德, 等. 陆表海台地沉积充填模式及内克拉通碳酸盐岩勘探新启示[J]. 岩石学报, 2017, 33(4): 1243-1256. https://www.cnki.com.cn/Article/CJFDTOTAL-YSXB201704017.htmCHEN Anqing, YANG Shuai, CHEN Hongde, et al. The sedimentary filing model of epeiric platform and new inspiration of innercratonic carbonate for oil & gas exploration[J]. Acta Petrologica Sinica, 2017, 33(4): 1243-1256. https://www.cnki.com.cn/Article/CJFDTOTAL-YSXB201704017.htm [16] 胡朝伟, 胡广, 张玺华, 等. 川西北地区茅口组上部黑色岩系的层位、沉积环境及生烃潜力评价[J]. 石油实验地质, 2020, 42(2): 202-214. doi: 10.11781/sysydz202002202HU Chaowei, HU Guang, ZHANG Xihua, et al. Sedimentary environment, hydrocarbon potential and development of black rocks in upper Maokou Formation, northwestern Sichuan[J]. Petroleum Geology & Experiment, 2020, 42(2): 202-214. doi: 10.11781/sysydz202002202 [17] NIE Haikuan, LI Donghui, LIU Guangxiang, et al. An overview of the geology and production of the Fuling shale gas field, Sichuan Basin, China[J]. Energy Geoscience2020, 1(3/4): 147-164. [18] 万天丰, 朱鸿. 古生代与三叠纪中国各陆块在全球古大陆再造中的位置与运动学特征[J]. 现代地质, 2007, 21(1): 1-13. https://www.cnki.com.cn/Article/CJFDTOTAL-XDDZ200701000.htmWAN Tianfeng, ZHU Hong. Positions and kinematics of Chinese continental blocks in reconstruction of global paleo-continents for Paleozoic and Triassic[J]. Geoscience, 2007, 21(1): 1-13. https://www.cnki.com.cn/Article/CJFDTOTAL-XDDZ200701000.htm [19] WILLIAMS M, HAYWOOD A M, GREGORY F J, et al. Deep-time perspectives on climate change: marrying the signal from computer models and biological proxies[M]. London: The Geological Society, 2007. [20] 朱彤. 四川盆地陆相页岩油气富集主控因素及类型[J]. 石油实验地质, 2020, 42(3): 345-354. doi: 10.11781/sysydz202003345ZHU Tong. Main controlling factors and types of continental shale oil and gas enrichment in Sichuan Basin[J]. Petroleum Geology & Experiment, 2020, 42(3): 345-354. doi: 10.11781/sysydz202003345 [21] 张廷山, 陈晓慧, 姜照勇, 等. 泸州古隆起对贵州赤水地区早、中三叠世沉积环境和相带展布的控制[J]. 沉积学报, 2008, 26(4): 583-592. https://www.cnki.com.cn/Article/CJFDTOTAL-CJXB200804008.htmZHANG Tingshan, CHEN Xiaohui, JIANG Zhaoyong, et al. Controls of Luzhou uplift on sedimentary environment and facies distribution in Early and Middle Triassic, Chishui, Guizhou province[J]. Acta Sedimentologica Sinica, 2008, 26(4): 583-592. https://www.cnki.com.cn/Article/CJFDTOTAL-CJXB200804008.htm [22] 梁东星, 胡素云, 谷志东, 等. 四川盆地开江古隆起形成演化及其对天然气成藏的控制作用[J]. 天然气工业, 2015, 35(9): 35-41. https://www.cnki.com.cn/Article/CJFDTOTAL-TRQG201509009.htmLIANG Dongxing, HU Suyun, GU Zhidong, et al. Formation and evolution process of Kaijiang paleohigh in the Sichuan Basin and its controlling effects on gas pool formation[J]. Natural Gas Industry, 2015, 35(9): 35-41. https://www.cnki.com.cn/Article/CJFDTOTAL-TRQG201509009.htm [23] 王鑫, 辛勇光, 田瀚, 等. 四川盆地中三叠统雷口坡组沉积储层研究进展[J]. 海相油气地质, 2020, 25(3): 210-222. https://www.cnki.com.cn/Article/CJFDTOTAL-HXYQ202003003.htmWANG Xin, XIN Yongguang, TIAN Han, et al. Research progress on sedimentation and reservoir of Leikoupo Formation of Middle Triassic in Sichuan Basin[J]. Marine Origin Petroleum Geology, 2020, 25(3): 210-222. https://www.cnki.com.cn/Article/CJFDTOTAL-HXYQ202003003.htm [24] 黄涵宇, 何登发, 李英强, 等. 四川盆地东南部泸州古隆起的厘定及其成因机制[J]. 地学前缘, 2019, 26(1): 102-120. https://www.cnki.com.cn/Article/CJFDTOTAL-DXQY201901012.htmHUANG Hanyu, HE Dengfa, LI Yingqiang, et al. Determination and formation mechanism of the Luzhou paleo-uplift in the southeastern Sichuan Basin[J]. Earth Science Frontiers, 2019, 26(1): 102-120. https://www.cnki.com.cn/Article/CJFDTOTAL-DXQY201901012.htm [25] HAQ B U, HARDENBOL J, VAIL P R. Chronology of fluctuating sea level since the Triassic[J]. Science, 1987, 235(4793): 1156-1167. [26] WILSON J L. Carbonate facies in geologic history[M]. New York: Springer, 1975. [27] READ J F. Carbonate platform facies models[J]. AAPG Bulletin, 1985, 69(1): 1-21. [28] CAROZZI A V. Carbonate rocks depositional model[M]. Upper Saddle River: Prentice Hall, 1989. -
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