Shale Gas Accumulation Conditions Analysis of Cambrian Xiaoyanxi Formation in Anhua Area of Hunan Province
-
摘要: 为查明湖南省安化地区寒武系小烟溪组（Ꞓ1x）页岩气勘探潜力，在对页岩气钻井资料分析基础上，结合野外地质调查、大地电磁测量及样品测试结果，研究了该组页岩分布特征、有机地化指标、岩矿组分、储集空间、含气性及保存条件。结果表明：安化地区寒武系小烟溪组暗色泥页岩的厚度普遍都在100 m以上；页岩有机碳含量高、有机质为I型、热演化程度高；页岩中的脆性矿物含量较高，均为硅质页岩岩相类型，具有溶蚀孔、粒间孔、铸模孔和微裂缝四种微观孔隙类型；钻井页岩岩芯现场解吸气含量较低，但实验条件下吸附气含量明显较高，表明发生过页岩气逸散；区内构造以开阔型褶皱为主，断裂相对不发育，页岩层顶板的封闭性较好，但底板的硅质岩中高角度裂缝较发育，易成为页岩气逸散通道。综合分析认为，研究区寒武系小烟溪组具有较好的页岩气成藏物质条件，但钻井所在位置目的层埋深较浅，底板封堵性较差，不利于页岩气保存；往南靠近向斜核部区域页岩气保存条件会更好，具备一定的勘探潜力。Abstract: In order to find out the shale gas exploration potential of Cambrian Xiaoyanxi Formation in the Anhua area, Hunan Province, based on the analysis of published shale gas drilling data, combined with field geological survey, magnetotelluric survey and analysis data, research on the shale development characteristics, organic geochemical index, rock and mineral composition, reservoir space, gas-bearing property and preservation conditions of Cambrian Xiaoyanxi Formation have been carried out in this study. The results show that the dark shale of Cambrian Xiaoyanxi Formation in the Anhua area is generally more than 100 m in thickness, developed with high organic carbon content, Type I organic matter and a high degree of thermal evolution; The content of brittle minerals in shale is high, and the lithofacies types are siliceous shale, including four micro pore types: dissolution pore, intergranular pore, mold pore and microfracture; The desorption gas content of drilling shale core was low, but the content of adsorbed gas was significantly higher under experimental conditions, indicating that the shale gas had escaped; The structures in the area are mainly open folds, and the faults are relatively undeveloped. The sealing ability of the shale roof is acceptable, but the siliceous rock in the floor develops high-angle fractures, which would easily become the escape channel for shale gas. The comprehensive analysis shows that the Cambrian Xiaoyanxi Formation in the Anhua area of Hunan Province has ideal material conditions for shale gas accumulation. However, the buried depth of the target layer at the drilling location is shallow and the floor sealing ability is inadequate, which is not preferable for the preservation of shale gas. The area close to the syncline core to the south provides better preservation conditions for shale gas and therefore should lead to certain exploration potential.
-
Key words:
- shale gas /
- Xiaoyanxi Formation /
- Cambrian /
- reservoir forming conditions /
- Anhua area, Hunan province
-
-
[1] 柏道远,钟 响,贾朋远,王先辉,彭云益.2015.雪峰造山带北段地质构造特征——以慈利-安化走廊剖面为例[J].地质力学学报, 21(3): 402-407.
[2] 邓 翼,杨荣丰,肖正辉,王朝晖.2020.张家界地区下寒武统牛蹄塘组页岩气成藏潜力研究[J].华南地质与矿产, 36(2):177-185.
[3] 高 莉,王宗秀,梁明亮,张林炎,李会军,李春麟,高万里.2019.湘西北地区五峰-龙马溪组页岩物质组成特征与页岩气潜力分析[J].中国地质, 46(2):407-418.
[4] 郭彤楼,何希鹏,曾 萍,高玉巧,张培先,何贵松.2020.复杂构造区页岩气藏地质特征与效益开发建议——以四川盆地及其周缘五峰组—龙马溪组为例[J].石油学报, 41(12):1495-1497.
[5] 郭旭升.2014.南方海相页岩气“二元富集”规律—四川盆地及周缘龙马溪组页岩气勘探实践认识[J].地质学报, 88(7):1211-1213.
[6] 国家发展和改革委员会.2006.中华人民共和国石油天然气行业标准SY/T 5336-2006 岩心分析方法[S].北京：中国标准出版社，1-2150.
[7] 黄籍中.1988.干酪根的稳定碳同位素分类依据[J].地质地球化学, 30(3): 66-68.
[8] 贾承造,庞雄奇,宋 岩.2021.论非常规油气成藏机理：油气自封闭作用与分子间作用力[J].石油勘探与开发, 48(3):437-452.
[9] 冷济高,韩建辉,李 飞,李 鹏,孟 兰.2014.湘西北地区花垣页岩气区块勘探潜力[J].天然气地球科学, 25(4):624-631.
[10] 李爱芬,韩文成,孙 海,Asadullah M. 2021.考虑多因素的页岩气吸附模型——以川东南五峰组—龙马溪组页岩为例[J].煤炭学报, 46(3):1003-1013.
[11] 李国亮,王先辉,杨 俊,刘天一,罗 鹏.2014.湖南扬子地区志留系龙马溪组页岩气成藏条件及前景评价[J].华南地质与矿产, 30(3):285-292.
[12] 李建青,高玉巧,花彩霞,夏在连.2014.北美页岩气勘探经验对建立中国南方海相页岩气选区评价体系的启示[J].油气地质与采收率, 21(4): 23-27.
[13] 李玉喜,聂海宽,龙鹏宇.2009.我国富含有机质泥页岩发育特点与页岩气战略选区[J].天然气工业, 29(12):117-118.
[14] 李玉喜,乔德武,姜文利.2012.全国页岩气资源潜力调查评价及有利区优选[R].北京:国土资源部油气资源战略研究中心.
[15] 刘 雯,张凯逊,马寅生,徐秋晨.2022.雪峰山隆起北缘热历史及其对牛蹄塘组生烃作用的影响[J].地质学报, 96(6):2144-2152.
[16] 卢志远,何治亮,余 川,叶 欣,李东晖,杜 伟,聂海宽.2021.复杂构造区页岩气富集特征—以四川盆地东南部丁山地区下古生界五峰组-龙马溪组为例[J].石油与天然气地质, 40(1): 91-93.
[17] 聂海宽,唐 玄,边瑞康.2009.页岩气成藏控制因素及中国南方页岩气发育有利区预测[J].石油学报, 30(4):488-490.
[18] 彭中勤,田 巍,苗凤彬,王保忠,王传尚.2019.雪峰古隆起边缘下寒武统牛蹄塘组页岩气成藏地质特征及有利区预测[J].地球科学, 44(10):1-14.
[19] 石学文,周尚文,田 冲,李 度,黎丁源,李 怡,吴 伟,蔡长宏,陈玉龙.2021.川南地区海相深层页岩气吸附特征及控制因素[J].天然气地球科学, 32(11):1735-1747.
[20] 唐 颖,邢 云,李乐忠,张滨海,蒋时馨.2012.页岩储层可压裂性影响因素及评价方法[J].地学前缘, 38(5): 723-724.
[21] 童迎世,童 琼.2012.湖南深部地球物理场特征与地震的关系[J].高原地震,24(1):2-4.
[22] 汪建国,陈代钊,王清晨,严德天,王卓卓.2007.中扬子地区晚震旦世-早寒武世转折期台-盆演化及烃源岩形成机理[J].地质学报, 81(8): 1104~1105.
[23] 吴蓝宇,胡东风,陆永潮,刘若冰,刘晓峰.2016.四川盆地涪陵气田五峰组—龙马溪组页岩优势岩相[J].石油勘探与开发, 43(2):189-197.
[24] 肖贤明,宋之光,朱炎铭,田 辉,尹宏伟.2013.北美页岩气研究及对我国下古生界页岩气开发的启示[J].煤炭学报, 38(5):723-724.
[25] 张中尧.2020.湘西北桑植区块五峰—龙马溪组页岩气保存条件研究[D].中国地质大学(北京)硕士学位论文.
[26] 赵子升.2020.湘西下寒武统黑色页岩地球化学特征及含气性分析[D].中国石油大学(北京)硕士学位论文.
[27] 周庆华,宋 宁,王成章,李博,车建炜,彭传圣,许江桥.2015.湖南常德地区牛蹄塘组页岩特征及含气性[J].天然气地球科学,26(2):308-309.
[28] Curtis J B, Jarvie D M, Ferworn K A. 2009. Applied geology and geochemistry of gas shales[A]. AAPG Conference[C]. Denver Colorado.
[29] Gale, J F W, Holder J. 2010. Natural fractures in some U.S. shales and their importance for gas production[J]. Petroleum Geology Conference Series 7, 1131-1140.
[30] GaleJ F W, Reed R M, Holder J. 2007. Natural fractures in the Barnett Shale and their importance for hydraulic fracture treatments[J]. AAPG Bulletin, 91: 603-622.
[31] Jarvie D M, Hill R J, Rubile T E, Pollastro R M. 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.
[32] Nelson R A. 1985. Geologic Analysis of Naturally Fractured Reservoirs: Contribution in Petroleum Geology and Engineering[M]. Houston：Gulf Publishing Company.
-
计量
- 文章访问数: 1012
- PDF下载数: 103
- 施引文献: 0
下载: