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Geomechanics and Engineering   Volume 13, Number 1, July 2017, pages 99-117
Rock physics modeling in sand reservoir through well log analysis, Krishna-Godavari basin, India
Dip Kumar Singha and Rima Chatterjee

Abstract     [Buy Article]
    Rock physics modeling of sandstone reservoir from gas fields of Krishna-Godavari basin represents the link between reservoir parameters and seismic properties. The rock physics diagnostic models such as contact cement, constant cement and friable sand are chosen to characterize reservoir sands of two wells in this basin. Cementation is affected by the grain sorting and cement coating on the surface of the grain. The models show that the reservoir sands in two wells under examination have varying cementation from 2 to more than 6%. Distinct and separate velocity-porosity and elastic moduli-porosity trends are observed for reservoir zones of two wells. A methodology is adopted for generation of Rock Physics Template (RPT) based on fluid replacement modeling for Raghavapuram Shale and Gollapalli Sandstones of Early Cretaceous. The ratio of P-wave velocity to S-wave velocity (Vp/Vs) and P-impedance template, generated for this above formations is able to detect shale, brine sand and gas sand with varying water saturation and porosity from wells in the Endamuru and Suryaraopeta gas fields having same shallow marine depositional characters. This RPT predicted detection of water and gas sands are matched well with conventional neutron-density cross plot analysis.
Key Words
    rock physics model; rock physics template; well log data; Krishna-Godavari Basin; neutron-density cross plot
(1) Dip Kumar Singha:
Department of Geophysics, Institute of Science, Banaras Hindu University, Varanasi 221005, India;
(2) Rima Chatterjee:
Department of Applied Geophysics, Indian Institute of Technology (Indian School of Mines), Dhanbad 826004, India.

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