--> --> Geocellular Model for Tertiary Reservoirs in Manhera Tibba Gas Field, Jaisalmer Basin, Rajasthan, India

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Geocellular Model for Tertiary Reservoirs in Manhera Tibba Gas Field, Jaisalmer Basin, Rajasthan, India


Manhera Tibba gas field is located in the Jaisalmer Mari High of Jaisalmer Basin, Rajasthan. The field is producing gas from Tertiary carbonate reservoirs since 1994. The main gas bearing reservoirs are B2 limestone (Bandah Formation), B4 & C2-C4 limestones (Khuiala Formation) and D4 limestone (Sanu Formation). The field represents a NW-SE trending faulted anticlinal closure with two main culminations. The current study is an unique attempt to carry out Geocellular Modelling of Manhera Tibba Field. The model has been prepared by integrating all G&G data viz. well, seismic, geological, petro-physical and reservoir to decipher the vertical and lateral heterogeneity and fine tuning regional correlation of litho-facies within identified gas bearing reservoirs considering presence of thin clay streaks within the limestone sections. Stratigraphic Framework Model, Well Model and Attribute Model are three basic constituents of the Geocellular Model. The model clearly demonstrates the variation in the reservoir properties and better locales for the exploitation of locked hydrocarbon reserves. Seismic horizons corresponding to top of Khuiala & Sanu formations as well as associated faults interpreted from 3D seismic have formed the basic input for the model. Additionally, Root mean square (RMS) velocity data is used to establish the spatial distribution of lithofacies and petrophysical properties. The reservoir level depth maps have been prepared using well picks as hard data and seismic as soft conformable surface using RMS (Reservoir Modelling System) software of M/s ROXER. The processed electro logs have been used for modelling that produces realistic descriptions of petro-physical parameters in the form of trend and distribution of porosity and gas saturation throughout the reservoir. The Geocellular model, thus prepared, stemmed in bringing out the static model of the field depicting vertical and lateral heterogeneity of carbonate pays as well as helps in estimation of in-place volume of gas in these reservoirs, which will be important input to carry out reservoir simulation for further development of the field.