Characterization and estimation of gas-bearing properties of Devonian coals using well log data from five Illizi Basin wells (Algeria)

Rafik Baouche, David A. Wood

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Abstract


     

In Algeria, wells drilled in the Illizi Basin suggest the presence of a significant areal trend of Devonian coal seams with the thickest coal seams penetrated in the Lower Devonian stratigraphic unit F6. This makes them some of the oldest thick coal seams encountered. These coals exist between approximately 1500 and 4000 meters below surface. In particular, numerous coals in these formations drilled in the Oudoume field have recorded gas shows while drilling. A study of basic well log data from five wells penetrating Illizi Basin coals is conducted to characterize their distribution and provisionally evaluate their gas-bearing potential using petrophysical analysis coupled with machine learning. A simple multi-layer perceptron model (one hidden layer with four nodes) is used in a novel way to replicate estimates of gas saturation in the coal samples calculated approximately with the modified Kim equation. It does so by considering three commonly measured well-log variables: gamma ray, sonic travel time, deep resistivity (307 data records from the five wells studied). The log-calculated approximations (modified Kim equation) can be matched to better than plus or minus 1 scf/ton by the multi-layer perceptron model. The results and analysis presented provide preliminary encouragement that suggests the presence of a potentially extensive gas-bearing Devonian coal trend in the Illizi Basin that is worthy of further exploration. Future work is required to integrate data from additional wells and laboratory analysis of core samples to verify the extent of that coal trend and to quantify its gas concentrations.

Cited as: Baouche, R., Wood, D.A. Characterization and estimation of gas-bearing properties of Devonian coals using well log data from five Illizi Basin wells (Algeria). Advances in Geo-Energy Research, 2020, 4(4), 356-371, doi: 10.46690/ager.2020.04.03


Keywords


Illizi Basin coals Algeria, coal-bed methane potential, Devonian coal seam areal trend, gas content estimates, machine learning

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References


Ayers, W.B. Coalbed gas systems, resources, and production and a review of contrasting cases from the San Juan and Powder River basins. AAPG Bull. 2002, 86(11): 1853-1890.

Battiti, R. First-and second-order methods for learning: between steepest descent and Newton’s method. Neural Comput. 1992, 4(2): 141-166.

Beuf, S., Biju-Duval, B., De Chapal, O., et al. Les Grès du paléozoïque inférieur au Sahara: Sédimentation et discontinuités, évolution structural. Paris, FR, Technip, 1971.

Bodden, R.W., Ehrlich, R. Permeability of coals and characteristic of desorption tests: Implications for coalbed methane production. Int. J. Coal Geol. 1998, 35(1-4): 333-347.

Boote, D.R.D., Clark-Lowes, D.D., Traut, M.W. Palaeozoic petroleum systems of North Africa. Geol. Soc. Lond. Spec. Publ. 1998, 132(1): 7-68.

Busch, A., Gensterblum, Y. CBM and CO2 -ECBM related sorption processes in coal: A review. Int. J. Coal Geol. 2011, 87(2): 49-71.

Busch, A., Gensterblum, Y., Krooss, B.M., et al. Investi-gation of high-pressure selective adsorption/desorption behaviour of CO2 and CH4 on coals: An experimental study. Int. J. Coal Geol. 2006, 66(1-2): 53-68.

Bustin, R.M., Clarkson, C.R. Geological controls on coalbed methane reservoir capacity and gas content. Int. J. Coal Geol. 1998, 38(1-2): 3-26.

Clarkson, C.R., Bustin, R.M. Binary gas adsorption/desorption isotherms: effect of moisture and coal composition upon carbon dioxide selectivity over methane. Int. J. Coal Geol. 2000, 42(4): 241–271.

Crain’s Petrophysical Handbook, 2020.

Crosdale, P.J., Moore, T.A., Mares, T.E. Influence of moisture content and temperature on methane adsorption isotherm analysis for coals from a low-rank, biogenically-sourced gas reservoir. Int. J. Coal Geol. 2008, 76(1-2): 166-174.

Dai, S., Han, D., Chou, C. Petrography and geochemistry of the Middle Devonian coal from Luquan, Yunnan Province, China. Fuel 2006, 85(4): 456-464.

Deng, S., Hu, Y., Chen, D., et al. Integrated petrophysical log evaluation for coalbed methane in the Hancheng area, China. J. Geophys. Eng. 2013, 10(3): 035009.

Diamond, W.P., Schatzel, S.J. Measuring the gas content of coal: A review. Int. J. Coal Geol. 1998, 35(1-4): 311-331.

Energy Information Authority of the United States Department of Energy (EIA). Natural gas: Coalbed methane reserves and production statistics. Energy Information Authority 2020.

Eschard, R., Abdallah, H., Braik, F., et al. The Lower Paleozoic succession in the Tassili outcrops, Algeria: Sedimentology and sequence stratigraphy. First Break 2005, 23(10): 27-36.

Eschard, R., Braik, F., Bekkouche, D., et al. Palaeohighs: Their influence on the North African Palaeozoic petroleum systems. Geological Society of London 2010, 7(1): 707-724.

Fausett, F. Fundamentals of Neural Networks: Architectures, Algorithms and Applications. Prentice-Hall, Englewood Cliffs, NJ. 1994.

Fekirine, B., Abdallah, H. Palaeozoic lithofacies correlatives and sequence stratigraphy of the Saharan Platform, Algeria. Geol. Soc. Lond. Spec. Publ. 1998, 132(1): 97-108.

Flores, R.M. Coalbed methane: From hazard to resource. Int. J. Coal Geol. 1998, 35(1-4): 3-26.

Flores, R.M. Coal and coalbed gas: Fueling the future. Oxford, UK, Newnes, 2013.

Ghienne, J.F., Boumendjel, K., Paris, F., et al. The Cambrian-Ordovician succession in the Ougarta range (western Algeria, North Africa) and interference of the late Ordovician glaciation on the development of the lower Palaeozoic transgression on northern Gondwana. Bull. Geosci. 2007, 82(3): 183-214.

Haykin, S. Neural networks: a comprehensive foundation. 1st edition Saddle River, NJ, USA 1994.

Hirst, J.P.P. Ordovician proglacial sediments in Algeria: Insights into the controls on hydrocarbon reservoirs in the In Amenas field, Illizi Basin. Geol. Soc. Lond. Spec. Publ. 2012, 368(1): 319-353.

Hornik, K. Approximation capabilities of multilayer feedfor-ward networks. Neural Netw. 1991, 4(2): 251-257.

Hornik, K., Stinchcombe, M., White, H. Multilayer feedfor-ward networks are universal approximators. Neural Netw. 1989, 2(5): 359-366.

Huang, B., Qin, Y., Zhang, W., et al. Identification of the coal structure and prediction of the fracturability in the No. 8 coal reservoir, Gujiao block, China. Energy Explor. Exploit. 2018, 36(2): 204-229.

Kennedy, K.L, Gibling, M.R., Eble, C.F., et al. Lower Devonian coaly shales of northern New Brunswick, Canada: Plant accumulations in the early stages of terrestrial colonization. J. Sediment. Res. 2013, 83(12): 1202-1215.

Kim, A.G. The composition of coalbed gas. 1973.

Laxminarayana, C., Crosdale, P.J. Controls on methane sorption capacity of Indian coals. AAPG Bull. 2002, 86(2): 201-212.

Laxminarayana, C., Crosdale, P.J. Role of coal type and rank on methane sorption characters of Bowen Basin, Australia coals. Int. J. Coal Geol. 1999, 40(4): 309-325.

LeHeron, D.P., Craig, J., Etienne, J.L. Ancient glaciations and hydrocarbon accumulations in North Africa and the Middle East. Earth-Sci. Rev. 2009, 93(3-4): 47-76.

Levine, J.R. Coalification: the evolution of coal as source rock and reservoir rock for oil and gas: Chapter 3, edited by B.E. Law and D.D. Rice. American Association of Petroleum Geologists Studies in Geology, Tulsa, pp. 39-77. 1993.

Li, P., Ma, D., Zhang, J., et al. Effect of wettability on adsorption and desorption of coalbed methane: A case study from low-rank coals in the southwestern Ordos Basin, China. Ind. Eng. Chem. Res. 2018, 57(35): 12003-12015.

Li, P., Ma, D., Zhang, J., et al. Effect of wettability on adsorption and desorption of coalbed methane: A case study from low-rank coals in the southwestern Ordos Basin, China. Ind. Eng. Chem. Res. 2018, 57(35): 12003-12015.

Li, T., Wu, C., Liu, Q. Characteristics of coal fractures and the influence of coal facies on coalbed methane productivity in the South Yanchuan Block, China. J. Nat. Gas Sci. Eng. 2015, 22: 625-632.

Liu, H., Mou, J., Cheng, Y. Impact of pore structure on gas adsorption and diffusion dynamics for long-flame coal. J. Nat. Gas Sci. Eng. 2015, 22: 203-213.

Liu, J., Chen, Z., Elsworth ,D., et al. Interactions of multiple processes during CBM extraction: A critical review. Int. J. Coal Geol. 2011, 87(3-4): 175-189.

Lu, W., Huang, B., Zhao, X. A review of recent research and development of the effect of hydraulic fracturing on gas adsorption and desorption in coal seams. Adsorpt. Sci. Technol. 2019, 37(5-6): 509-529.

Mastalerz, M., Drobniak, A., Str ˛apo ´c, D., et al. Variations in pore characteristics in high volatile bituminous coals: Implications for coal bed gas content. Int. J. Coal Geol. 2008, 76(3): 205-216.

Mavor, M.J., Close, J.C., McBane, R.A. Formation evaluation of exploration coalbed-methane wells. SPE Form. Eval. 1994, 9(4): 285-294.

McLennan, J.D., Schafer, P.S., Pratt, T.J. A guide to determining coalbed gas content: Gas Research Institute. Top. Rep. GRI 1995, 94(396): 123.

Moore, T.A. Coalbed methane: A review. Int. J. Coal Geol. 2012, 101: 36-81.

Mullen, M.J. Coalbed Methane Resource evaluation from wireline logs in the northeastern San Juan Basin: A case study. Paper SPE 18946 Presented at Low Permeability Reservoirs Symposium, Denver, Colorado, USA, 6-8 March, 1989.

Mullen, M.J. Log evaluation in well drilled for coalbed methane. Rocky Mt. Assoc. Geol. 1989, 38: 113-124.

Olajossy, A., Cie´slik, J. Why coal bed methane (CBM) production in some basins is difficult. Energies 2019, 12(15): 2918.

Olajossy, A. Some parameters of coal methane system that cause very slow release of methane from virgin coal beds (CBM). Int. J. Min. Sci. Technol. 2017, 27(2): 321-326.

Pan, H., Huang, Z. Log interpretation model of determining coalbed coal quality parameters. Geoscience 1998, 12(3): 447-451. (in Chinese)

Pan, Z., Wood, D.A. Coalbed methane (CBM) exploration, reservoir characterisation, production, and modelling: A collection of published research (2009-2015). J. Nat. Gas Sci. Eng. 2015, 100(26): 1472-1484.

Petrolog, Petrophysical software. 2019 Pillalamarry, M., Harpalani, S., Liu, S. Gas diffusion behavior of coal and its impact on production from coalbed methane reservoirs. Int. J. Coal Geol. 2011, 86(4): 342-348.

Reddy, K.J. Coalbed Natural Gas: Energy and Environment. New York, USA, Nova Science Publishers, 2010.

Seidle, J. Fundamentals of Coalbed Methane Reservoir Engineering. Tulsa, USA, PennWell Books, 2011.

Strapoc, D., Mastalerz, M., Dawson, K., et al. Biogeochem-istry of microbial coal-bed methane. Annu. Rev. Earth Planet. Sci. 2011, 39: 617-656.

Susanto, H., Sondakh, K., Sitaresmi, R., et al. Evaluation of initial gas volume of coalbed methane using four method. J. Mech. Eng. Mechatronics 2019, 3(1): 28-39.

Tang, S., Tang, D., Tang, J., et al. Controlling factors of coalbed methane well productivity of multiple superposed coalbed methane systems: A case study on the Songhe mine field, Guizhou, China. Energy Explor. Exploit. 2017, 35(6): 665-684.

Zhao, P., Mao, Z., Jin, D., et al. Investigation on log responses of bulk density and thermal neutrons in coalbed with different ranks. J. Geophys. Eng. 2015, 12(3): 477-484.




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