The Ganga basin in the northern part of the Indian plate is characterized by a thick sequence of Neoproterozoic Cambrian sediments that are similar in age to hydrocarbon producing Oman Salt basins in Arabian plate and Bikaner Nagaur basin in western India. Though a number of exploratory wells have been drilled throughout the Ganga basin, commercial success in terms of hydrocarbon discovery still remains elusive. The present study attempts to re-evaluate the prospectivity of the Ganga basin by tectonic reconstruction of the Indian plate during Neoproterozoic-Cambrian. Correlations with similar producing basins in Arabian plate and western part of Indian plate are made. Based on the tectonic reconstruction, the strike-slip Najd Fault system in the Arabian plate is envisaged to continue on to the Indian plate extending across the Aravalli Delhi Fold Belt on to the Ganga basin in its eastern part. The constituent faults of the Najd Fault system are deciphered by gravity, seismic data and geomorphology to have the present day en-echelon E-W trend. Strike-slip activity along these trends developed two broadly N-S oriented rift systems correlating with the Sarda and the Gandak depressions. These serve as areas of deposition of Neoproterozoic Ujhani, Tilhar and Karanpur Formation that are coeval stratigraphically to their counterparts in western Indian plate and the Arabian plate.

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Hydrocarbon Prospectively of the Ganga Basin (India) Based on Plate Tectonic Reconstruction

  • Subhobroto Mazumder,
  • Sushil Kumar

摘要

The Ganga basin in the northern part of the Indian plate is characterized by a thick sequence of Neoproterozoic Cambrian sediments that are similar in age to hydrocarbon producing Oman Salt basins in Arabian plate and Bikaner Nagaur basin in western India. Though a number of exploratory wells have been drilled throughout the Ganga basin, commercial success in terms of hydrocarbon discovery still remains elusive. The present study attempts to re-evaluate the prospectivity of the Ganga basin by tectonic reconstruction of the Indian plate during Neoproterozoic-Cambrian. Correlations with similar producing basins in Arabian plate and western part of Indian plate are made. Based on the tectonic reconstruction, the strike-slip Najd Fault system in the Arabian plate is envisaged to continue on to the Indian plate extending across the Aravalli Delhi Fold Belt on to the Ganga basin in its eastern part. The constituent faults of the Najd Fault system are deciphered by gravity, seismic data and geomorphology to have the present day en-echelon E-W trend. Strike-slip activity along these trends developed two broadly N-S oriented rift systems correlating with the Sarda and the Gandak depressions. These serve as areas of deposition of Neoproterozoic Ujhani, Tilhar and Karanpur Formation that are coeval stratigraphically to their counterparts in western Indian plate and the Arabian plate.