Sequence of strata with consistent and monotonous repetition of two or more kind alternating lithologies are quite common in geological record through the ages and are interpreted as a product of cyclic sedimentation. Cyclic depositional pattern is extensively found in fluvial deposits. Here a brief model of regional depositional stacking pattern is proposed based on the observations from regional geophysical log correlation as well as core based interpretation from Karanpura field. Subsurface facies study from this marginal Gondwana basin enhanced the understanding of stacking pattern and depositional cyclicity preserved in middle Permian Barakar Formation. Four major fining upward depositional cycles have been established regionally, each consisting of low and high accommodation system tracts at bottom and top of individual cycle respectively. Findings have been correlated with basin evolution process and major geological time events.
Bioturbation is a typically small scale yet potentially significant geological process altering rock properties by reworking. For many years, bioturbation studies found application in exploration geology to estimate paleobathymetry, interpreting depositional environment and identifying key stratigraphic surfaces. These act as vital inputs to the geological models, for determination of source rock potential, reservoir quality and modeling of petroleum systems. Recently geologists extended the application of bioturbation studies to address production related challenges. Recognizing the bioturbation effects and incorporating them in reservoir simulation models can improve production predictions and enhanced oil recovery operations. This paper discusses bioturbation and its effects on reservoir quality, its performance and production.
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