--> Seismic Structural Interpretation, 2D and 3D Modeling and Reservoir Characterization of North Sanghar Block and Well Chak 63-01, Lower Indus Basin, Sindh, Pakistan

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Seismic Structural Interpretation, 2D and 3D Modeling and Reservoir Characterization of North Sanghar Block and Well Chak 63-01, Lower Indus Basin, Sindh, Pakistan

Abstract

Well log data and data of six seismic lines has been used in exploring the hydrocarbon potential of Sanghar area, Lower Indus Basin, Sindh, Pakistan. The seismic sections were analyzed structurally to assess the suitable trap. The petrophysical analysis tells us that the Lower Goru Formation is the main reservoir and having the suitable attributes for a prospect. The area is under the Extensional Tectonic Regime which produced the Normal faulting in the region. Major Horst and Graben structures are formed due to process of rifting. The seismic sections are of lines O/886-SGR-346, O/886-SGR-347, O/886-SGR-389, 936-SGR-120, 20017-SNJ-02 and 20017-SNJ-20. The reflectors were marked due to prominent reflection on the seismic sections. Root mean square and interval velocities are used for the calculation of average velocities to convert the given time into depth. The reflector Top Lower Goru is marked due to its prominent reflection on the seismic sections due to data quality. The depths of reflectors are found by using velocities and one-way travel time. For the structural interpretation of the area, time and depth contour maps are generated. The hydrocarbon potential of CHAK63-01 is calculated by evaluating their petrophysical analysis of the Well logs. Average values of porosity for each productive zone ranges from 18.15 to 20%; average water saturation is 31%, and average hydrocarbon saturation is 68%. The total reservoir rock volume is 1729.7 acres and the total volumetric recoverable gas reserves are 140.3 Billion Cubic Feet (BCF) of CHAK63-01. Whereas new productive zone has 741.31 acres total reservoir rock volume and its total volumetric recoverable gas reserves are 60.13 Billion Cubic Feet (BCF) Keywords: Seismic lines, hydrocarbon potential, Sanghar area, Lower Goru Formation, Seismic sections, Structural interpretation.