以石门剖面为例分析桂北地区下石炭统页岩气勘探潜力
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摘要
利用岩石热解、X射线衍射、镜质体反射率、红外碳硫测定和有机质成熟度分析等方法,以桂中拗陷最北部的石门剖面为例,探讨下石炭统页岩气勘探潜力。下石炭统英塘组第三段厚约340 m,有机质含量较高(TOC质量分数为1.04%～1.47%);R_o值为2.35%～2.77%,平均为2.52%;脆性矿物的质量分数为50%～77%,脆性指数为29.59%～47.96%;黏土矿物经历了较为明显的蒙皂石向伊利石的转化阶段,微孔隙发育程度较高。将该剖面页岩气储层的地化、物性特征及沉积厚度与四川盆地及北美页岩气对比,认为桂中拗陷英塘组第三段具有较好的页岩气勘探潜力。
The Shimen section in the north Guizhong depression is studied by means of rock pyrolysis, X-ray diffraction, vitrinite reflectance, infrared carbon and sulphur determination and organic matter maturity analysis so as to discuss the exploration potential of Lower Carboniferous shale gas. It shows that the mudstone and shale in the Member 3 of Yingtang Formation has a thickness of 340 m, with high abundance of organic matter(TOC of 1.04%～1.47%), moderate thermal maturity(2.35%～2.77%), well developed micro-pores, suitable brittle mineral content(50%～77%) and favorable clay mineral compositions. Clay minerals experienced obvious transformation from smectite to illite with well developed micro pores. Comparison of thickness, physical property and geochemistry in the Shimen section with those in the Sichuan Basin and northern America reveals that the Member 3 of Yingtang Formation in the central Guangxi is of favorable exploration potential for shale gas.
The Shimen section in the north Guizhong depression is studied by means of rock pyrolysis, X-ray diffraction, vitrinite reflectance, infrared carbon and sulphur determination and organic matter maturity analysis so as to discuss the exploration potential of Lower Carboniferous shale gas. It shows that the mudstone and shale in the Member 3 of Yingtang Formation has a thickness of 340 m, with high abundance of organic matter(TOC of 1.04%～1.47%), moderate thermal maturity(2.35%～2.77%), well developed micro-pores, suitable brittle mineral content(50%～77%) and favorable clay mineral compositions. Clay minerals experienced obvious transformation from smectite to illite with well developed micro pores. Comparison of thickness, physical property and geochemistry in the Shimen section with those in the Sichuan Basin and northern America reveals that the Member 3 of Yingtang Formation in the central Guangxi is of favorable exploration potential for shale gas.
引文
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[14] 陈建平,赵文智,王招明,等.海相干酪根天然气生成成熟度上限与生气潜力极限探讨——以塔里木盆地研究为例[J].科学通报,2007,52(增刊1):95-100.Chen J P, Zhao W Z, Wang Z M, et al. The upper limit of gas maturity and the limit of gas potential in marine kerogen: A case study of Tarim Basin [J]. Chinese Science Bulletin, 2007, 52(S1): 95-100. (in Chinese)
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[2] 张小龙,张同伟,李艳芳,等.页岩气勘探和开发进展综述[J].岩性油气藏,2013,25(2):116-122.Zhang X L, Zhang T W, Li Y F, et al. Research advance in exploration and development of shale gas[J]. Lithologic Reservoirs, 2013, 25(2): 116-122. (in Chinese)
[3] 岑文攀,王瑞湖,徐海,等.广西页岩气勘查现状、存在问题及建议[J].南方国土资源,2018,(3):40-43.Chen W P, Wang R H, Xu H, et al. Existing problems and suggestions on the current situation of shale gas exploration in Guangxi [J]. Land and Resources of Southern China, 2018, (3): 40-43. (in Chinese)
[4] 苑坤,方欣欣,林拓,等.桂中坳陷西北部中泥盆统页岩地球化学特征及沉积环境[J].地质与勘探,2017,53(1):179-186.Yuan K, Fang X X, Lin T, et al. Geochemical features and sedimentary conditions of Middle-Devonian shale in the northwestern Central Guangxi depression[J]. Geology and Exploration, 2017, 53(1): 179-186. (in Chinese)
[5] 苑坤,方欣欣,闻涛,等.桂中坳陷西北部桂页1井泥盆系页岩气聚集条件研究[J].中国石油勘探,2017,22(4):90-97.Yuan K, Fang X X, Wen T, et al. Accumulation conditions of Devonian shale gas in Well GY-1 in northwestern Central Guangxi depression [J]. China Petroleum Exploration, 2017, 22(4): 90-97. (in Chinese)
[6] 张聪,刘欣春,徐胜林,等.台间盆地相富有机质页岩特征研究——以南丹地区莫德剖面罗富组为例[J].矿物岩石,2017,37(1):84-92.Zhang C, Liu X C, Xu S L. The characteristics of organic rich shale in inter-platform basin: A case study on Luofu Formation of mode section in Nandan[J]. Journal of Mineral Petrology, 2017, 37(1): 84-92. (in Chinese)
[7] 谭旭航,王雁,侯明才,等.桂中坳陷南丹地区中-下泥盆统塘丁组富有机质页岩储层特征[J].天然气勘探与开发,2017,40(2):26-31.Tan X H, Wang Y, Hou M C, et al. Characteristics of Tangding Formation organic-rich shale in Nandan area, Guizhong depression[J]. Natural Gas Exploration and Development, 2017, 40(2): 26-31. (in Chinese)
[8] 覃洪峰,贺超群,熊毅.桂北下石炭统沉积环境浅析[J].南方国土资源,2014,(8): 44-49.Qin H F, He C Q, Xiong Y. Sedimentary environment analysis of Lower Carboniferous System in northern Guangxi [J]. Land and Resources of Southern China, 2014, (8): 44-49. (in Chinese)
[9] 郑镇海.广西早石炭世沉积环境与成煤特征[J].南方国土资源,2008,(1):39-40.Zheng Z H. Sedimentary environment and coal formation characteristics of early Carboniferous in Guangxi [J]. Land and Resources of Southern China, 2008, (1): 39-40. (in Chinese)
[10] 聂海宽,张金川.页岩气储层类型和特征研究——以四川盆地及其周缘下古生界为例[J].石油实验地质,2011,33(3):219-225.Nie H K, Zhang J C. Types and characteristics of shale gas reservoirs: A case study of the Lower Palaeozoic in the Sichuan Basin and its periphery[J]. Petroleum Geology and Experiment, 2011, 33(3): 219-225. (in Chinese)
[11] 程克明,王世谦,董大忠,等.上扬子区下寒武统筇竹寺组页岩气成藏条件[J].天然气工业,2009,29(5):40-44.Cheng K M, Wang S Q, Dong D Z, et al. Accumulation conditions of shale gas reservoirs in the Lower Cambrian Qiongzhusi Formation, the Upper Yangtze region [J]. Natural Gas Industry, 2009, 29(5): 40-44. (in Chinese)
[12] 罗胜元,王传尚,彭中勤.桂中坳陷下石炭统鹿寨组页岩气研究[J].华南地质与矿产,2016,32(2):180-190.Luo S Y, Wang C S, Peng Z Q. Shale gas research of Luzhai Formation, Lower Carboniferous in Guizhong depression [J]. Geological and Mineral Resources of South China, 2016, 32(2): 180-190. (in Chinese)
[13] 蒋裕强,董大忠,漆麟,等.页岩气储层的基本特征及其评价[J].天然气工业,2010,30(10):7-12.Jiang Y Q, Dong D Z, Qi L, et al. Basic features and evaluation of shale gas reservoirs [J]. Natural Gas Industry, 2010, 30(10): 7-12. (in Chinese)
[14] 陈建平,赵文智,王招明,等.海相干酪根天然气生成成熟度上限与生气潜力极限探讨——以塔里木盆地研究为例[J].科学通报,2007,52(增刊1):95-100.Chen J P, Zhao W Z, Wang Z M, et al. The upper limit of gas maturity and the limit of gas potential in marine kerogen: A case study of Tarim Basin [J]. Chinese Science Bulletin, 2007, 52(S1): 95-100. (in Chinese)
[15] 张晓明,石万忠,徐清海,等.四川盆地焦石坝地区页岩气储层特征及控制因素[J].石油学报,2015,36(8):926-939.Zhang X M, Shi W Z, Xu Q H, et al. Reservoir characteristic and controlling factors of shale gas in Jiaoshiba area, Sichuan Basin [J]. Acta Petrolei Sinica, 2015, 36(8): 926-939. (in Chinese)
[16] Bowker K A. Barnett shale gas production, Fort Worth Basin: Issues and discussion [J]. AAPG Bulletin, 2007, 91(4): 523-533.
[17] Loucks R G, Reed R M, Ruppel S C, et al. Morphology, genesis, and distribution of nanometer-scale pores in siliceous mudstones of the Mississippian Barnett Shale[J]. Journal of Sedimentary Research, 2009, 79(12): 848-861.