泥页岩脆-延转化带及其在页岩气勘探中的意义

doi:10.11743/ogg20180505

Abstract

Abstract: Shale brittleness and ductility always attract much attention in shale gas exploration and development.The determination of the depth interval of brittle-ductile transition of shale is key to the evaluation of shale gas preservation and hydraulic fracturing.Based on rock mechanics tests,we established a set of methods for determining the brittle-ductile transition zone of shale.The pre-consolidation pressure was determined through uniaxial strain test,and the threshold of over-consolidation ratio(OCR) and the critical confining pressure of brittle-ductile transition of shales were defined via triaxial compression test.And in turn,the bottom boundary of brittle zone was determined according to the maximum palaeo-depth combined with the OCR threshold,while the top boundary of ductile zone was determined by the critical confining pressure of brittle-ductile transition.The brittle-ductile transition zone is the depth interval between the bottom boundary of brittle zone and the top boundary of ductile zone.The shale brittle zone,ductile zone and brittle-ductile transition zone defined by the above methods can be used for evaluations of shale gas preservation conditions and hydraulic fracturing.The results show that(1) in the brittle zone,the shale gas is not well preserved as brittle fractures are easy to occur under tectonic events;(2) in the ductile zone,the hydraulic fracturing does not work well because the hydraulic fractures are easy to close; but(3) in the brittle-ductile transition zone,the shales are not only more favorable for shale gas preservation but also better in fracturability.Therefore,the brittle-ductile transition zone is the best interval for the exploration and development of marine shale gas in southern China.The exploration practice indicates that the burial depth of the shale gas play zones with high and stable yield in the Silurian Longmaxi Formation is just within the brittle-ductile transition zone determined by the methods proposed in this study.

Key words: shale brittleness, OCR, brittle-ductile transition zone, Longmaxi Formation, Silurian, shale gas, Sichuan Basin

CLC Number:

TE122.2

Yuan Yusong, Liu Junxin, Zhou Yan. Brittle-ductile transition zone of shale and its implications in shale gas exploration[J]. Oil & Gas Geology, 2018, 39(5): 899-906.

References

[1] 龙胜祥,曹艳,朱杰,等.中国页岩气发展前景及相关问题初探[J].石油与天然气地质,2016,37(6):847-853. Long Shengxiang,Cao Yan,Zhu Jie,et al.A preliminary study on prospects for shale gas industry in China and relevant issue[J].Oil & Gas Geology,2016,37(6):847-853.
[2] 董大忠,王玉满,李新景,等.中国页岩气勘探开发新突破及发展前景思考[J].天然气工业,2016,36(1):19-36. Dong Dazhong,Wang Yuman,Li Xinjing,et al.Breakthrough and prospect of shale gas exploration and development in China[J].Natural Gas Industry,2016,36(1):19-36.
[3] 袁玉松,周雁,邱登峰,等.埋藏过程中泥页岩非构造裂缝的形成演化模式[J].石油与天然气地质,2015,36(5):822-827. Yuan Yusong,Zhou Yan,Qiu Dengfeng,et al.Evolutionary patterns of non-tectonic fractures in shale during burial[J].Oil & Gas Geology,2015,36(5):822-827.
[4] Wong T,Baud P.The brittle-ductile transition in porous rock:A review[J].Journal of Structural Geology,2012,44:25-53.
[5] Ding W,Li C,Li C,et al.Fracture development in shale and its relationship to gas accumulation[J].Geoscience Frontiers,2012,3(1):97-105.
[6] Olson J E,Laubach S E,Lander R H.Natural fracture characterization in tight gas sandstones:Integrating mechanics and diagenesis[J].AAPG Bulletin,2009,93(11):1535-1549.
[7] Holt R M,Fjær E,Stenebråten J F,et al.Brittleness of shales:Relevance to borehole collapse and hydraulic fracturing[J].Journal of Petroleum Science and Engineering,2015,131(1):200-209.
[8] 衡帅,杨春和,郭印同,等.层理对页岩水力裂缝扩展的影响研究[J].岩石力学与工程学报,2015,34(2):228-237. Heng Shuai,Yang Chunhe,Guo Yintong,et al.Influence of bedding planes on hydraulic fracture propagation in shale formations[J].Chinese Journal of Rock Mechanics and Engineering,2015,34(2):228-237.
[9] Eshkalak M O,Aybar U,Sepehrnoori K.On the feasibility of re-sti-mulation of shale wells[J].Petroleum Science,2015,12(3):553-559.
[10] Zeng Y J,Zhang X,Zhang B P.Stress redistribution in multi-stage hydraulic fracturing of horizontal wells in shales[J].Petroleum Science,2015,12(4):628-635.
[11] 程远方,黄荣樽.钻井工程中泥页岩井壁稳定的力学分析[J].石油大学学报:自然科学版,1993,17(4):35-39. Cheng Yuanfang,Huang Rongzun.Mechanical analysis of borehole stability in shale formation in drilling[J].Journal of the University of Petroleum,China,1993,17(4):35-39.
[12] Yarali O,Kahraman S.The drillability assessment of rocks using the different brittleness values[J].Tunnelling and Underground Space Technology,2011,26(2):406-414.
[13] Gale J F W,Laubach S E,Olson J E,et al.Natural fractures in shale:A review and new observations[J].AAPG Bulletin,2014,98(11):2165-2216.
[14] Hu Q,Liu X,Gao Z,et al.Pore structure and tracer migration beha-vior of typical American and Chinese shales[J].Petroleum Science,2015,12(4):651-663.
[15] Liu Z,Sun Z.New brittleness indexes and their application in shale/clay gas reservoir prediction[J].Petroleum Exploration and Development,2015,42(1):129-137.
[16] 郭旭升,胡东风,魏祥峰,等.四川盆地焦石坝地区页岩裂缝发育主控因素及对产能的影响[J].石油与天然气地质,2016,37(6):799-808. Guo Xusheng,Hu Dongfeng,Wei Xiangfeng,et al.Main controlling factors on shale fractures and their influences on production capacity in Jiaoshiba area,the Sichuan Basin[J].Oil & Gas Geology,2016,37(6):799-808.
[17] Ingram G M,Urai J L.Top-seal leakage through faults and fractures:the role of mudrock properties[M].London:Geological Society,1999.
[18] Hu D,Zhang H,Ni K,et al.Preservation conditions for marine shale gas at the southeastern margin of the Sichuan Basin and their controlling factors[J].Natural Gas Industry,2014,1(2):178-184.
[19] Nobakht M,Clarkson C R,Kaviani D.New type curves for analyzing horizontal well with multiple fractures in shale gas reservoirs[J].Journal of Natural Gas Science and Engineering,2013,10:99-112.
[20] 曹言光,刘长松,林平,等.应用断裂力学理论建立油气井压裂时岩石破裂压力计算模型[J].西安石油学院学报:自然科学版,2003,18(4):36-39. Cao Yanguang,Liu Changsong,Lin Ping,et al.Establishing the model for calculating the fracturing pressure of formation rock during oil/gas wells fracturing by using fracture mechanics theory[J].Journal of Xi'an Petroleum Institute(Natural Science Edition),2003,18(4):36-39.
[21] Kias E,Maharidge R,Hurt R.Mechanical versus mineralogical brittleness indices across various shale plays[C]//SPE Annual Technical Conference and Exhibition.Texas:SPE,2015.
[22] Rickman R,Mullen M,Petre E,et al.A practical use of shale petrophysics for stimulation design optimization:all shale plays are not clones of the Barnett Shale[C]//SPE Annual Technical Conference and Exhibition.Denver:SPE,2008.
[23] Labani M M,Rezaee R.The importance of geochemical parameters and shale composition on rock mechanical properties of gas shale reservoirs:A case study from the kockatea shale and Carynginia Formation From the Perth Basin,Western Australia[J].Rock Mechanics and Rock Engineering,2015,48(3):1249-1257.
[24] Wang F P,Gale J F.Screening criteria for shale-gas systems[J].Gulf Coast Association of Geological Societies Transactions,2009,59:779-793.
[25] 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 al.Geological characteristics,formation mechanism and resource potential of shale gas in China[J].Petroleum Exploration and Development,2010,37(6):641-653.
[26] 聂海宽,包书景,高波,等.四川盆地及其周缘下古生界页岩气保存条件研究[J].地学前缘,2012,19(3):280-294. Nie Haikuan,Bao Shujing,Gao Bo,et al.A study of shale gas preservation condition for the Lower Paleozoic in Sichuan Basin and its pheriphery[J].Earth Science Frontiers,2012,19(3):280-294.
[27] 李双建,周雁,孙冬胜.评价盖层有效性的岩石力学实验研究[J].石油实验地质,2013,35(5):574-578. Li Shuangjiang,Zhou Yan,Sun Dongsheng.Rock mechanic experiment study of evaluation on cap rock effectiveness[J].Petroleum Geology & Experiment,2013,35(5):574-578.
[28] 陈泽明,雍自权,朱杰平,等.四川盆地东南部南川地区五峰组-龙马溪组页岩特征[J].成都理工大学学报:自然科学版,2013,40(6):696-702. Chen Zeming,Yong Ziquan,Zhu Jieping,et al.Features of Wufeng Formation and Longmaxi Formation shale in Nanchuan,southeast of Sichuan,China[J].Journal of Chengdu University of Technology(Science & Technology Edition),2013,40(6):696-702.
[29] 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 Basin and its peripheral areas[J].Journal of Chengdu University of Technology:Science & Technology Edition,2013,40(6):621-639.
[30] 何治亮,金晓辉,沃玉进,等.中国海相超深层碳酸盐岩油气成藏特点及勘探领域[J].中国石油勘探,2016,21(1):3-14. He Zhiliang,Jin Xiaohui,Wo Yujin,et al.Hydrocarbon accumulation characteristics and exploration domains of ultra-deep marine carbonates in China[J].China Petroleum Exploration,2016,21(1):3-14.
[31] Babanouri N,Karimi Nasab S,Baghbanan A,et al.Over-consolidation effect on shear behavior of rock joints[J].International Journal of Rock Mechanics and Mining Sciences,2011,48(8):1283-1291.
[32] Nygård R,Gutierrez M,Bratli R K,et al.Brittle-ductile transition,shear failure and leakage in shales and mudrocks[J].Marine and Petroleum Geology,2006,23(2):201-212.
[33] 陈劲人,彭秀美.从三轴抗剪抗压实验看埋深对区域盖层遮挡性能的影响[J].石油实验地质,1994,16(3):282-289. Chen Jinren,Peng Xiumei.Influence of buried depth on the properties of regional covering strata with an experimental analysis of triaxial resistance to shearing and compressing[J].Experimental Petroleum Geology,1994,16(3):282-289.
[34] 李双建,金之钧,袁玉松,等.模拟地层条件下泥岩三轴应力实验及其油气意义[J].石油与天然气地质,2016,37(4):598-605. Li Shuangjiang,Jin Zhijun,Yuan Yusong,et al.Triaxial stress experiment of mudstone under simulated geological conditions and its petroleum significance[J].Oil & Gas Geology,2016,37(4):598-605.
[35] Addis M A.Mechanisms for sediment compaction responsible for oil field subsidence[D].UK:University of London,1987.
[36] 刘俊新,杨春和,刘伟,等.泥质岩盖层前期名义固结压力及封闭特性研究[J].岩石力学与工程学报,2015(12):2377-2387. Liu Junxin,Yang Chunhe,Liu Wei,et al.Apparent preconsolidation stress and sealing characteristics of argillaceous cap rocks[J].Chinese Journal of Rock Mechanics and Engineering,2015,34(12):2377-2387.
[37] Stróyk J,Tankiewicz M.The undrained shear strength of over-consolidated Clays[J].Procedia Engineering,2014,91(10):317-321.
[38] Nygård R,Gutierrez M,Gautam R,et al.Compaction behavior of argillaceous sediments as function of diagenesis[J].Marine and Petroleum Geology,2004,21(3):349-362.
[39] Springer J.Decompaction and backstripping with regard to erosion,salt movement,and interlayered bedding[J].Computers & Geos-ciences,1993,19(8):1115-1125.
[40] Mogi K.Deformation and fracture of rocks under confining pressure elasticity and plasticity of some rocks[J].Bulletin Earthquake Research Institute,Tokyo University,1965,43:349-379.
[41] Guo T,Zhang H.Formation and enrichment mode of Jiaoshiba shale gas field,Sichuan Basin[J].Petroleum Exploration and Development,2014,41(1):31-40.

Brittle-ductile transition zone of shale and its implications in shale gas exploration

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