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Porosity; permeability; cementation factor; neural network model; Cauvery basin

This work has been developed to classify sand and shale from seven wells in the Cauvery basin using a multilayered feedforward neural network (MLFN) model. Seven wells distributed over $5100 \rm{km}^{2}$ of this basin have been utilized for analysis of conventional well logs and reservoir characterization. Hydrocarbon bearing sediments of Andimadam, Bhuvanagiri, Nannilam and Niravi formations of the Cauvery basin are evaluated in terms of shaliness, cementation factor, porosity, water saturation, and permeability. Pickett plot has been applied to investigate the cementation factor, formation water resistivity, permeability. The cementation factor ($m$) varies from 1.31 to 1.86 in these formations, whereas permeability varies from 0.01 to 400 md. Very good quality reservoir exists in the Bhuvanagiri formation with high permeability 300–400 md, whereas a good quality reservoir is occurring in Niravi, Nannilam and Andimadam formations with hydrocarbon saturation 60–70%.

ATUL KUMAR PANDEY¹ RIMA CHATTERJEE¹ BISWAJIT CHOUDHURY^{1 2}

1. Department of Applied Geophysics, Indian Institute of Technology (Indian School of Mines), Dhanbad 826 004, India.
2. Geological Survey of India, Jaipur, India.

Published

1 January 2020

Manuscript received

12 March 2019

Manuscript revised

6 August 2019

Accepted

13 August 2019

Early published

Unedited version published online

Final version published online

20 December 2019