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The Leading Edge; October 2004; v. 23; no. 10; p. 966-972; DOI: 10.1190/1.1813354
© 2004 Society of Exploration Geophysicists
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A case study of stratigraphic and lithologic interpretation of thin reservoirs through an integrated approach

A. Bose, V. Singh, A.K. Tandon, B.S. Josyulu and Mahesh Chandra

Oil and Natural Gas Corp. Ltd., Dehradun, India

Corresponding author: dvs@ongc.net

The first 20% of the full text of this article appears below.

To improve modeling, understanding and drilling of new wells in thin reservoirs, we developed an advanced quantitative methodology that integrates 3D poststack seismic data, impedance logs, and geologic knowledge. The approach uses well-log analysis, seismic wavelet estimation and well-to-seismic calibration, horizon tracking, instantaneous and multidimensional attribute analysis for structural mapping, stratigraphic interpretation using window-based attributes, and inverted acoustic impedance obtained from 3D poststack stratigraphic inversion.

This paper demonstrates the effectiveness of this methodology through a case study of producing reservoirs with Miocene basal sands, which are thin and discrete in nature. In addition, lateral facies (frequently observed in these producing sands) pose a major challenge in delineation and development of these reservoirs.


   Geologic background
 
The study area, in the Cambay-Tarapur block of Cambay Basin, India (Figure 1), lies between the Vatrak and Mahi rivers to the west of Cambay Field. The N-S trending paleohighs with bounding faults in this field are considered genetically related to the basement paleohighs of the Cambay and Gulf areas that are also oriented N-S. These anticlinal features produce hydrocarbons from Miocene reservoir rocks in commercial quantities and there have been oil indications from the Eocene and Oligocene reservoirs of the Kalol and Tarapur formations.


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  		Figure 1. Map of Cambay Basin, India, showing the study area. The basin has produced commercial hydrocarbons since the first discovery of oil in 1958. Oil and gas fields are shown in red. The 3D seismic survey covers 64 km2 and 13 wells have been drilled in the area to date.

 
Both Tarapur and Kalol (Figure 2) are thought to have been deposited under alternate regressive and transgressive cycles, indicating fluctuating brackish-to-shallow marine conditions. The marine transgression was most pronounced and widespread during the late Eocene period in which Tarapur Formation was deposited. The uppermost Babaguru section is considered fluvial-to-shallow marine . . . [Full Text of this Article]






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