Application of integrated formation evaluation and three-dimensional modeling in shale gas prospect identification

Source:
By:Jin Gao, Zhe Cao, Guangdi Liu, Longmei Zhao, Lijun Du, Yuhua Kong

DOI: https://doi.org/10.30564/jgr.v1i3.1385

Abstract:

Identifying the shale gas prospect is crucial for gas extraction from such reservoirs. Junggar Basin (in Northwest China) is widely considered to have high potential as a shale gas resource, and the Jurassic, the most significant gas source strata, is considered as prospective for shale gas exploration and development. This study evaluated the Lower Jurassic Badaowan Formation shale gas potential combined with geochemical, geological, and well logging data, and built a three-dimensional (3D) model to exhibit favorable shale gas prospects. In addition, methane sorption capacity was tested for verifying the prospects. The Badaowan shale had an average total organic carbon (TOC) content of 1.30 wt. % and vitrinite reflectance (Ro) ranging from 0.47% to 0.81% with dominated type III organic matter (OM). X-ray diffraction (XRD) analyses showed that mineral composition of Badaowan shale was fairly homogeneous and dominated by clay and brittle minerals. 67 wells were used to identify prospective shale intervals and to delineate the area of prospects. Consequently, three Badaowan shale gas prospects in the Junggar Basin were identified: the northwestern margin prospect, eastern Central Depression prospect and Wulungu Depression prospect. The middle interval of the northwestern margin prospect was considered to be the most favorable exploration target benefitted by wide distribution and high lateral continuity. Generally, methane sorption capacity of the Badaowan shale was comparable to that of the typical gas shales with similar TOC content, showing a feasible gas potential.

References:

[1] EIA. International Energy Outlook 2016, US Department of Energy/EIA, Washington, DC, 2016. [2] Curtis J.B.. Fractured shale-gas systems, AAPG Bull., 2002, 86(11): 1921-1938. [3] Hao, F., Zou, H.Y. Lu, Y.. Mechanisms of shale gas storage: Implications for shale gas exploration in China, AAPG Bull., 2013, 97(8): 1325-1346. [4] Horsfield, B. Schulz, H.M.. Shale gas exploration and exploitation, Mar. Petrol. Geol., 2012, 31: 1-2. [5] Kou, R., Alafnan, S.F.K. and Akkutlu, I.Y.. Multiscale Analysis of Gas Transport Mechanisms in Kerogen, Transport Porous Med., 2016, 116: 493-519. [5] Zhang, Z.H., Xiang, K., Qing, L.M., Zhuang, W.S., Xi, W.J. and Zhao, S.F.. Geochemical characteristics of source rocks and their contribution to petroleum accumulation of Chepaizi area in Sikeshu depression, Junggar Basin, Geol. China, 2012, 39(2): 326-337 (in Chinese with English abstract). [6] Sun, J.L., Gamboa, E.S., Schechter, D. and Rui, Z.H.. An integrated workflflow for characterization and simulation of complex fracture networks utilizing microseismic and horizontal core data, J. Nat. Gas Sci. Eng., 2016, 34: 1347-1360. [7] Sun, J.L., Zou, A., Sotelo, E. and Schechter, D.. Numerical simulation of CO2 huff-n-puff in complex fracture networks of unconventional liquid reservoirs, J. Nat. Gas Sci. Eng., 2016, 31: 481-492. [8] Ross, D. and Bustin. R.M.. Shale gas potential of the lower Jurassic Gordondale member, ortheastern British Columbia, Canada, Bull. Can. Petrol. Geol., 2007, 55(1): 51-75. [9] Ross, D. and Bustin. R.M.. Characterizing the shale gas resource potential of Devonian–Mississippian strata in the Western Canada sedimentary basin: Application of an integrated formation evaluation, AAPG Bull., 2008, 92(1): 87-125. [10] Ross, D.J. and Bustin, R.M.. The importance of shale composition and pore structure upon gas storage potential of shale gas reservoirs, Mar. Petrol. Geol., 2009, 26: 916–927. [11] EIA.. Technically Recoverable Shale Oil and Shale Gas Resources: An Assessment of 137 Shale Formations in 41 Countries Outside the United States. US Department of Energy/EIA, Washington, DC, 2013. [12] Pollastro, R.M., Jarvie, D.M., Hill, R.J. and Adams, C.W.. Geologic framework of the Mississippian Barnett Shale, Barnett-Paleozoic total petroleum system, Bend arch-Fort Worth Basin, Texas, AAPG Bull., 2007, 91(4): 405-436. [13] Rawsthorn, K.. Shale Gas Prospectivity Potential Prepared for: Australian Council of Learned Academies (Acola), Australian Council of Learned Academies (Acola), 2013. [14] Chen, S.B., Zhu, Y.M., Qin, Y., Wang, H.Y., Liu, H.L. and Fang, J.H.. Reservoir evaluation of the Lower Silurian Longmaxi Formation shale gas in the southern Sichuan Basin of China, Mar. Petrol. Geol., 2014, 57: 619-630. [15] Yan, J.F., Men, P.Y., Sun, Y.Y., Qian, Y., Liu, W., Zhang, H.Q., Liu, J., Kang, J.W., Zhang, S.N., Bai, H.H. and Zheng, X.. Geochemical and geological characteristics of the Lower Cambrian shales in the middle-upper Yangtze area of South China and their implication for the shale gas exploration, Mar. Petrol. Geol., 2016, 70: 1-13. [16] Huang, J.L., Zou, C.N., Li, J.Z., Dong, D.Z., Wang, S.J., Wang, S.Q., Wang, Y.M., Li. D.H.. Shale gas accumulation conditions and favorable zones of Silurian Longmaxi Formation in south Sichuan Basin, China, J. China Coal Soc., 2012, 37(5): 782-787. [17] Long, P.Y., Zhang, J.C., Li, Y.X., Tang, X., Cheng, L.J., Liu, Z.J., Han, S.B.. Reservoir-forming conditions and strategic select favorable area of shale gas in the Lower Paleozoic of Chongqing and its adjacent areas. Earth Science Frontiers.,2012, 19(2): 221-243 (in Chinese with an English abstract). [18] Nie, H.K., Tang, X., Bian, R.K.. Controlling factors for shale gas accumulation and prediction of potential development area in shale gas reservoir of South China. Acta Petrolei Sinica., 2009, 30(4): 484-491(in Chinese with an English abstract). [19] Pu, B.L., Jiang, Y.L., Wang, Y., Bao, S.J. Liu, X.J..Reservoir forming conditions and favorable exploration zones of shale gas in Lower Silurian Longmaxi Formation of Sichuan Basin. Acta Petrolei Sinica, 2010, 31(2): 225-230 (in Chinese with an English abstract). [20] Shan, Y.S., Zhang, J.C., Li, X.G., Wang, L. Ge, M.N.. Shale gas accumulation factors and rediction of favorable area of Taiyuan Formation in Liaohe Eastern Up-lift. J. Daqing Petrol. Inst., 2012, 36(1): 1-7 (in Chinese with an English abstract). [21] Bohacs, K.M.. Contrasting Expressions of Depositional Sequences in Mudstones from Marine to Non-marine Environs, in Schieber, J., Zimmerle, W., and Sethi, P., eds., Mudstones and Shales, vol. 1, Characteristics at the Basin scale: Stuttgart, Schweizerbart’sche Verlagsbuchhandlung, 1998: 32–77. [22] Bohacs, K.M., Grawbowski, G.J., Carroll, A.R., Mankeiwitz, P.J., Miskell-Gerhardt, K.J., Schwalbach, J. R., Wegner, M. B., Simo, J.A.. Production, Destruction, and Dilution – the Many Paths to Source-Rock Development, SEPM Special Publication 2005, 82: 61-101. [23] Guthrie, J.M. and Bohacs, K.M.. Spatial Variability of Source Rocks: a Critical Element for Defining the Petroleum System of Pennsylvanian Carbonate Reservoirs of the Paradox Basin, SE Utah. in W.S. Houston, L.L. Wray, P.G.Moreland, eds., The Paradox Basin Revisited -- New Developments in Petroleum Systems and Basin Analysis, RMAG 2009 Special Publication -- the Paradox Basin, 2009: 95-130. [24] Passey, Q.R., Bohacs, K.M., Esch, W.L., Klimentidis, R. Sinha, S.. From oil-prone source rock to gas-producing shale reservoir–geologic and petrophysical characterization of unconventional shale-gas reservoirs, Beijing, China, 2010. [25] Jia, C.Z., Zheng, M., Zhang, Y.F.. Unconventional hydrocarbon resources in China and the prospect of exploration and development, Petrol. Explor. Dev., 2012, 39(2): 139–146. [26] Jiang, F.J., Pang, X.Q. and Ouyang, X.C.. The main progress and problems of shale gas study and the potential prediction of shale gas exploration, Earth Sci. Front., 2012, 19: 198-211 (in Chinese with an English abstract). [27] Stevens, S. H., Moodhe, K. D. Kuuskraa, V. A.. China Shale Gas and Shale Oil Resource Evaluation and Technical Challenges. In Society of Petroleum Engineers report 165832, presented at the Society of Petroleum Engineers Asia Pacific Oil and Gas Conference and Exhibition. Jakarta, Indonesia, 2013. [28] Zou, C.N., Dong, D.Z., Yang, H., Wang, Y.M., H, J.L., Wang, S.F. and Fu, C.X.. Conditions of shale gas accumulation and exploration practices in China. Nat. Gas Ind., 2011, 31(12): 26-39 (in Chinese with English abstract). [29] Guo, J.G., Pang, X.Q., Guo, F.T., Wang, X.L., Xiang, C.F., Jiang, F.J., Wang, P.W., Xu, J.,Hu, T. Peng, W.L.. Petroleum generation and expulsion characteristics of Lower and Middle Jurassic source rocks on the southern margin of Junggar Basin, northwest China: implications for unconventional gas potential, Can. J. Earth Sci., 2014, 51: 537-557. [30] Boyer, C., Kieschnick, J., Suarez-Rivera, R., Lewis, R. E. and Waters, G.. Producing gas from its source, Oilfield Rev., 2006, 18: 36-49. [31] Zhang, D.W., Zhang, J.C., Li, Y.X., Qiao, D.W. Jiang, W.L.. Shale gas assessment and selection of favorable exploration areas in China (in Chinese), Research Center of oil and Gas Resources of the Ministry of Land and Resources (RCOGR), 2012. [32] Bruns, B., Littke, R., Gasparik, M., Van Wees, J.D.,Nelskamp, S.. Thermal evolution and shale gas potential estimation of theWealden and Posidonia Shale in NW-Germanyand the Netherlands: a 3D basin modelling study, Basin Res., 2016, 28: 1-32. [33] Mohnhoff, D., Littke, R. Sachse, V.F.. Estimates of shale gas contents in the Posidonia Shale and Wealden of the west central Lower Saxony Basin from high-resolution 3D numerical basin modelling, German J. Geol., 2016, 167(2/3): 295-314. [34] Uffmann, K., Littke, R., Gensterblum, Y.. Paleozoic petroleum systems of the Munsterland Basin, Western Germany: a 3D basin modelling study-Part 2: Petroleum generation and storage with special emphasis on shale gas resource. Oil Gas European Magazine, 2014, 2/2014: 98-103. [35] Wang, G. and Carr, T.R.. Methodology of organic-rich shale lithofacies identification and prediction: A case study from Marcellus Shale in the Appalachian basin, Comput. Geosci., 2012, 49: 151-163. [36] Cao, J., Wang, X.L., Sun, P.A., Zhang, Y.Q., Tang, Y., Xiang, B.L., Lan, W.F. and Wu, M.. Geochemistry and origins of natural gases in the central Junggar Basin, northwest China, Org. Geochem., 2012, 53: 166–176. [37] Shao, Y.. Petroleum accumulation of the Jurassic deeply-buried lower assemblage in the southern Junggar Basin. Geol. J. China Univ., 2013, 19(1): 86–94. (in Chinese with English abstract). [38] Wang, X.L., Kuang, J. and Yang, H.B.. The ThirdRound Assessment of Hydrocarbon Resources in the Junggar Basin. Internal Technical Report of Research Institute of Petroleum Exploration and Development, PetroChina Xinjiang Oilfifield Company (in Chinese), 2000. [39] Jin, Z.J., Cao, J., Hu, W.X., Zhang, Y.J., Yao, S.P., Wang, X.L., Zhang, Y.Q., Tang, Y. and Shi, X.P.. Episodic petroleum fluid migration in fault zones of the northwestern Junggar Basin(northwest China): Evidence from hydrocarbon-bearing zoned calcite cement, AAPG Bull., 2008, 92(9):1225-1243. [40] Chen, X., H. Lu, L. S. Shu, H. Wang, G. Zhang,., Study on tectonic evolution of Junggar Basin. Geol. J. China Univ., 2002, 8(3): 257–267 (in Chinese with English abstract). [41] Li, P.L., Liu, C.H.. Exploration potential and migration-accumulation rules of natural gas in Junggar Basin, Acta Petrol. Sinica., 2005, 26(2): 6-10 (in Chinese with an English abstract). [42] Yu, Y. J., Zhang, Y. J., Dong, D. Z. and Han, Y. K.. Current situation of natural gas exploration and its counter measures in Junggar Basin, Petrol. Explor. Dev., 2006, 33(3): 267-273 (in Chinese with an English abstract). [43] Zhao, M.J., Song, Y., Liu, S.B., Yang, H.B., Liu, D.G.. Accumulation systems and filling process of natural gas in Junggar Basin. Geol. Rev., 2009, 55(2): 215- 224 (in Chinese with an English abstract). [44] Li, J., Jiang, Z.L., Xia, L., Wang, D.L., Han Z.X.. Geochemical characteristics of coal-measure source rocks and coal-derived gas in Junggar Basin, NW China, Petrol. Explor. Dev., 2009, 36(3):365-374. [45] Wu, X.Q., Huang, S.P., Liao, F.R., and Li, Z.S.. Geochemical characteristics and sources of natural gas from the south margin of Junggar Basin. Nat. Gas Geosci., 2009, 22(2): 224–232 (in Chinese with English abstract). [46] Gao, J., Liu, G.D., Yang, W.W., Zhao, D.R., Chen, W., Liu, L.. Geological and geochemical characterization of lacustrine shale, a case study of Lower Jurassic Badaowan shale in the Junggar Basin, Northwest China, J. Nat. Gas Sci. Eng., 2016, 31: 15-27. [47] Ufer, K., Stanjek, H., Roth, G., Dohrmann, R., Kleeberg, R., Kaufhold, S.. Quantitative phase analysis of bentonites by the Rietveld method. Clay. Clay Miner., 2008, 56(2): 272–282. [48] Langmuir, I.. The adsorption of gases on plane surfaces of glass, mica and platinum, J. Am. Chem. Soc., 1918, 40: 1361–1403. [49] Passey, Q.R., Creaney, S., Kulla, J.B., Moretti, F.J. and Stroud, J.D.. A practical model for organic richness from porosity and resistivity logs, AAPG Bull. 1990, 74(12): 1777-1794. [50] Chen, J.P., Wang, X.L., Deng, C.P., Zhao, Z., Ni, Y.Y., Sun, Y.G., Yang, H.B., Wang, H.T., Liang, D.G., Zhu, R.K., Peng, X.L.. Geochemical features of source rocks in the southern margin, Junggar Basin, Northwestern China. Acta Petrol. Sinica, 2015, 36(11): 768-780 (in Chinese with an English abstract). [52] Qiu, N,S., Zhang, Z,H. and Xu, E.S.. Geothermal regime and Jurassic source rock maturity of the Junggar Basin, northwest China, J. Asian Earth Sci., 2008, 31: 464-478. [53] Jarvie, D.M. and Lundell, L.L.. Kerogen type and thermal transformation of organic matter in the Miocene Monterey Formation, In: Isaacs, C.M., Rullkötter, J. (Eds.),The Monterey Formation-from Rocks to Molecules, Columbia University Press, New York, 2001: 268-295. [54] He, M., Graham, S., Scheirer, A. H. and Peters, K. E.. A basin modeling and organic geochemistry study in the Vallecitos syncline, San Joaquin Basin, California, Mar. Petrol. Geol., 2014, 49: 15-34. [55] Tan, J.Q., Horsfield, B., Fink, R., Krooss, B., Schulz, H.M., Rybacki, E., Zhang, J.C., Boreham, C.J., Van Graas. G., Tocher, B. A.. Shale gas potential of the major marine shale formations in the Upper Yangtze Platform, South China, Part III: Mineralogical, lithofacial, petrophysical, and rock mechanical properties, Energ. Fuel., 2014, 28: 2322-2342. [56] Tan, J.Q., Weniger, P.,Krooss, B., Merkel, A.,Horsfield, B., Zhang, J.C.,Boreham, C.J.,Van Graas. G., Tocher, B.A.. Shale gas potential of the major marine shale formations in the Upper Yangtze Platform, South China, Part II: Methane sorption capacity, Fuel, 2014, 129: 204-218. [57] Gasparik, M.,Bertier, P.,Gensterblum, Y.,Ghanizadeh, A.,Krooss, B. M., Littke, R.. Geological controls on the methane storage capacity in organic-rich shales, Int. J. Coal Geol., 2014, 123: 34-51. [58] Guo, H.J., Jia, W.L., Peng, P.A., Lei, Y.H., Luo, X.R., Cheng, M., Wang, X.Z., Zhang, L.X., Jiang, C.F..The composition and its impact on the methane sorption of lacustrine shales from the Upper Triassic Yanchang Formation, Ordos Basin, China, Mar. Petrol. Geol., 2014, 57: 509-520. [59] Wang, S.B., Song, Z.G., Cao, T.T., Song. X.. The methane sorption capacity of Paleozoic shales from the Sichuan Basin, China, Mar. Petrol. Geol., 2013, 44: 112-119.