54th U.S. Rock Mechanics/Geomechanics Symposium,
28 June - 1 July,
physical event cancelled
2020. American Rock Mechanics Association
10 in the last 30 days
22 since 2007
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Formations encountered in the Kutch and Saurashtra basin exhibit diverse drilling, logging, cementing and completion related challenges. Data scarcity in the region, demands rigorous planning for the upcoming wells with detailed analysis of hazards associated with the overburden and reservoir rocks. This study has characterized these challenges and corresponding solutions linked to three different geological sequences. They are Tertiary, Late Cretaceous Deccan Trap and Early Cretaceous to Jurassic clastic formations. Integrated geomechanical analysis incorporating geophysical, geological and drilling parameters is conducted for improvement in drilling performance, well condition and ROP. These revelations assisted in significant improvement of borehole condition in the formations above, below the trap and the trap itself. Significant NPT was reduced because of good borehole condition as it prevented any issues while casing and cementing operations and provided good cement bond logs. Also enabled operator to perform conclusive production testing with significant reserves accretion.
Study area belongs to the Kutch-Saurashtra region, located in shallow water off the coast of Gujarat in western India. Kutch Saurashtra Basin is a pre-cratonic rift basin whose evolution is related with breakup of eastern Gondwanaland from western Gondwanaland in the Late Triassic - Early Jurassic with N-S extension until the Early Cretaceous. Since then several geological events have influenced the basin with the most significant being collision of Indian and Eurasia plates by Late Miocene. Researchers (Talwani and Gangopadhyay, 2001) suggests this activity subjected the onshore part of the basin with N-S compressive stress leading to development of folds and reverse faults.
Subsurface lithostratigraphy in the region is complex and can be characterized by virtue of their distinct geological sequence and varied lithology. The shallower formations – Kandla, Chhasra, Godhra, NS-Tuna, Fulra, Jakhau and Nakhatarana are characterized by clay, claystone, sandstone, siltstone, shale and carbonate facies. The underlying formation is Deccan Trap which has alternating basaltic flows, up to 2500 m thick. It belongs to the Upper Cretaceous to Lower Paleocene age.
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