Current Science

Open Access Open Access  Restricted Access Subscription Access

Mineralogy and Pore Structure Characterization of Lower Oligocene to Early Miocene Formations in Parts of Assam–arakan Basin, North East India.


Affiliations
1 Indian Institute of Technology (Indian School of Mines), Dhanbad 826 004, India
 

In this study, reservoir rocks have been characterized by pore-scale measurements and mineralogical analysis of core samples, drill cuttings or crushed samples col-lected from Upper Assam and Mizoram, North East India. The mineralogical composition and pore types were examined using various laboratory techniques, like petrography under transmitted light microscope, field emission scanning electron microscopy (FE-SEM), X-ray diffraction and nitrogen (N2) gas adsorption. The variation in porosity and permeability was related to different factors such as rock composition, cement-ing, textural parameters, grain size and sorting, pores and pore throats. Mapping attributes like pore struc-ture, surface area, pore size distribution (PSD), pore orientation, connectivity and pore volume regulated fluid flow through the pore network, which provides significant variations in the reservoir properties. Pores were analysed from the image processing of FE-SEM photomicrographs, which were used to estimate poros-ity and generate the topology map. This information was further used to visualize pore connectivity in a 3D pore network model. Pore characterization from N2 adsorption analysis helped infer the pore structure, pore volume, and PSD in the reservoir rocks. The stud-ied samples have an excellent meso to macro pore net-work that is also supplemented by the derived pore network.

Keywords

Mineralogy, Pore Size Distribution, Pore Network, Pore Structure, Reservoir Rocks
User
Notifications
Font Size

  • Sing, K. S. W., Everett, D. H., Haul, R. A. W., Moscou, L., Pierotti, R. A., Rouquerol, J. and Siemieniewska, T., Reporting physisorp-tion data for gas/solid systems with special reference to the deter-mination of surface area and porosity. Pure Appl. Chem., 1985, 57, 603–619.

  • Kuila, U. and Prasad, M., Specific surface area and pore-size distri-bution in clays and shales. Geophys. Prospect., 2013, 61, 341–362.

  • Wandrey, C. J., Sylhet–Kopili/Barail–Tipam composite total petro-leum system, Assam Geologic Province, India. US Geol. Surv. Bull., 2004, 2208-D, 1–19.

  • Alam, J., Chatterjee, R. and Dasgupta, S., Estimation of pore pres-sure, tectonic strain and stress magnitudes in the Upper Assam basin: a tectonically active part of India. Geophys. J. Int., 2019, 216, 659–675.

  • Gogoi, T. and Chatterjee, R., Estimation of petrophysical parame-ters using seismic inversion and neural network modeling in Upper Assam basin, India. Geosci. Front., 2019, 10(3), 1113–1124; https:// doi.org/10.1016/j.gsf.2018.07.002.

  • Murty, K. N., Geology and hydrocarbon prospects of Assam Shelf – recent advances and present status. Petrol. Asia J., 1983, 6(4), 1–14.

  • Lokho, K. and Singh, B. P., Ichnofossils from the Miocene Middle Bhuban Formation, Mizoram, Northeast India and their paleoenvi-ronmental significance. Acta Geol. Sin., 2013, 87(4), 801–812.

  • Nandy, D. R., Dasgupta, S., Sarkar, K. and Ganguly, A., Tectonic evolution of Tripura–Mizoram Fold Belt, Surma Basin, northeast India. J. Geol. Min. Metall. Soc. India, 1983, 55(4), 186–194.

  • Gogoi, T. and Chatterjee, R., Multimineral modeling and estima-tion of brittleness index of shaly sandstone in Upper Assam and Mizoram areas, India. SPE Reserv. Eval. Eng., 2020, 23(2), 708–721; https://doi.org/10.2118/200498-PA.

  • Welton, J. E., SEM petrology Atlas, American Association of Pe-troleum Geologists, Oklahoma, USA, 2003, p. 247.

  • Mendhe, V. A. et al., Geochemical and petrophysical characteristics of Permian shale gas reservoirs of Raniganj Basin, West Bengal, India. Int. J. Coal Geol., 2018, 188, 1–24.

  • Brunauer, S., Emmett, P. H. and Teller, E., Adsorption of gases in multimolecular layers. J. Am. Chem. Soc., 1938, 60(2), 309–319.

  • Nelson, P. H., Pore-throat sizes in sandstones, tight sandstones, and shales. AAPG Bull., 2009, 93, 329–340.

  • Barett, E. P., Joyner, L. G. and Halenda, P. P., The determination of pore volume and area distributions in porous substances, I. Com-putations from nitrogen isotherms. J. Am. Chem. Soc., 1951, 73(1), 373–380.

  • Wu, K., Ma, Q. F. and Feng, Q. I., Middle Permian pore characteris-tics and shale gas exploration significance from the Gu-feng forma-tion in Jianshi, Western Hubei. Earth Sci. J. China Univ. Geosci., 2012, 37, 175–183.

  • Tavanaei, A. and Salehi, S., Pore, throat, and grain detection for rock SEM images using digital watershed image segmentation algorithm. J. Porous Media, 2015, 18, 507–518.

  • Fatt, I. et al., The network model of porous media. Petrol. Trans. AIME, 1956, 207, 160–181.

  • Mendhe, V. A., Mishra, S., Kamble, A. D., Bannerjee, M., Mukherjee, S., Kumar, V. and Sinha, A., Shale gas and emerging energy resource: prospects in India. Indian Min. Eng. J., 2015, 54(6), 21–31.

  • Sarkar, P., Kumara, A., Singh, K. H., Ghosh, R. and Singh, T. N., Pore system, microstructure and porosity characterization of Gond-wana shale of Eastern India using laboratory experiment and water-shed image segmentation algorithm. Mar. Pet. Geol., 2018, 94, 246–260.

  • Anovitz, L. M. and Cole, D. R., Characterization and analysis of porosity and pore structures. Rev. Mineral. Geochem., 2015, 80, 61–164; http://dx.doi.org/10.2138/rmg.2015.80.04.

  • Brunauer, S., Deming, L. S., Deming, W. S. and Teller, E., On a theory of the Van der Waals adsorption of gases. J. Am. Chem. Soc., 1940, 62, 1723–1732.


Abstract Views: 215

PDF Views: 114




  • Mineralogy and Pore Structure Characterization of Lower Oligocene to Early Miocene Formations in Parts of Assam–arakan Basin, North East India.

Abstract Views: 215  |  PDF Views: 114

Authors

Triveni Gogoi
Indian Institute of Technology (Indian School of Mines), Dhanbad 826 004, India
Jenifer Alam
Indian Institute of Technology (Indian School of Mines), Dhanbad 826 004, India
Rima Chatterjee
Indian Institute of Technology (Indian School of Mines), Dhanbad 826 004, India

Abstract


In this study, reservoir rocks have been characterized by pore-scale measurements and mineralogical analysis of core samples, drill cuttings or crushed samples col-lected from Upper Assam and Mizoram, North East India. The mineralogical composition and pore types were examined using various laboratory techniques, like petrography under transmitted light microscope, field emission scanning electron microscopy (FE-SEM), X-ray diffraction and nitrogen (N2) gas adsorption. The variation in porosity and permeability was related to different factors such as rock composition, cement-ing, textural parameters, grain size and sorting, pores and pore throats. Mapping attributes like pore struc-ture, surface area, pore size distribution (PSD), pore orientation, connectivity and pore volume regulated fluid flow through the pore network, which provides significant variations in the reservoir properties. Pores were analysed from the image processing of FE-SEM photomicrographs, which were used to estimate poros-ity and generate the topology map. This information was further used to visualize pore connectivity in a 3D pore network model. Pore characterization from N2 adsorption analysis helped infer the pore structure, pore volume, and PSD in the reservoir rocks. The stud-ied samples have an excellent meso to macro pore net-work that is also supplemented by the derived pore network.

Keywords


Mineralogy, Pore Size Distribution, Pore Network, Pore Structure, Reservoir Rocks

References





DOI: https://doi.org/10.18520/cs%2Fv123%2Fi2%2F202-213