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Fig. 7 An arbitrary section through wells showing Pre Stack Inversion Output

Figure 7 An arbitrary section through wells showing Pre Stack Inversion Output

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C39 field of Tapti Daman Sector of Mumbai Offshore is located in the northern most part of ( Series ML held by ONGC (Fig.1). Exploratory drilling activities in the area started in December 199 by drilling of 8 exploratory wells (C-1 to C-8) based on G&G data analysis of 2D seismic data (Fig. 2 As a result hydrocarbon pools were established in Daman and Mahuva formation of Oligocene age To chase these pay sands 1680 SKM of 3D OBC data was acquired in 1999-2000 field season. Thi was one of the earliest OBC data acquisitions in this part of the world. Integrating this seismic wit existing well data five more wells were drilled in the area establishing more hydrocarbon pools. Thes hydrocarbon pools were understood to have been expressed well through sweetness attribute o seismic data (Fig. 1). Taking lead from exploratory input main pay sand of Mahuva Formation wa undertaken for development in 2008-09. One platform with six slots was put up for production fror this pay sand. In the Initial phase of development drilling, two wells, one each close to explorator wells C-6 & C-8 were planned and four wells up-dip of the established reservoir were drilled. The fot up-dip wells had issued with either reservoir thickness or fluid content. As a consequence, a reservo characterisation project was taken up to understand the fluid and facies characters of this pay sand.
C39 field of Tapti Daman Sector of Mumbai Offshore is located in the northern most part of ( Series ML held by ONGC (Fig.1). Exploratory drilling activities in the area started in December 199 by drilling of 8 exploratory wells (C-1 to C-8) based on G&G data analysis of 2D seismic data (Fig. 2 As a result hydrocarbon pools were established in Daman and Mahuva formation of Oligocene age To chase these pay sands 1680 SKM of 3D OBC data was acquired in 1999-2000 field season. Thi was one of the earliest OBC data acquisitions in this part of the world. Integrating this seismic wit existing well data five more wells were drilled in the area establishing more hydrocarbon pools. Thes hydrocarbon pools were understood to have been expressed well through sweetness attribute o seismic data (Fig. 1). Taking lead from exploratory input main pay sand of Mahuva Formation wa undertaken for development in 2008-09. One platform with six slots was put up for production fror this pay sand. In the Initial phase of development drilling, two wells, one each close to explorator wells C-6 & C-8 were planned and four wells up-dip of the established reservoir were drilled. The fot up-dip wells had issued with either reservoir thickness or fluid content. As a consequence, a reservo characterisation project was taken up to understand the fluid and facies characters of this pay sand.
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-ig. 3 Simultaneous Inversion using partial stacks demonstrating facies discrimination
-ig. 3 Simultaneous Inversion using partial stacks demonstrating facies discrimination
Fig. 5 P-lmpedance Logs from recorded data and from Inverted data Reservoir sand corresponding to Mahuva Formation is bounded between Mahuva Top and Lowe Mahuva Top horizon, and overlies Lower Mahuva Top surface. Log data from all the available exploratory wells and one of the development well (C-PA4) having DSI, coupled with C-2, C-6, C-7 8 C-8 were used for generating well to seismic ties and generating wavelet for pre-stack inversion. / very robust low frequency model along with stringent QC check (Fig. 5 & 6) to set parameters for pre stack inversion resulted in output of P-lmpedance, Vp/Vs and other derivative volumes of elastic properties.
Fig. 5 P-lmpedance Logs from recorded data and from Inverted data Reservoir sand corresponding to Mahuva Formation is bounded between Mahuva Top and Lowe Mahuva Top horizon, and overlies Lower Mahuva Top surface. Log data from all the available exploratory wells and one of the development well (C-PA4) having DSI, coupled with C-2, C-6, C-7 8 C-8 were used for generating well to seismic ties and generating wavelet for pre-stack inversion. / very robust low frequency model along with stringent QC check (Fig. 5 & 6) to set parameters for pre stack inversion resulted in output of P-lmpedance, Vp/Vs and other derivative volumes of elastic properties.
Geobodies representing gas and water bearing sands plotted on most probable sand map.
Geobodies representing gas and water bearing sands plotted on most probable sand map.
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Reservoir Characterization
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