--> Abstract: Predicting the Temperature of Hydrocarbon Expulsion from oil Asphaltene Kinetics and Oil Source Correlation:a Case Study of South Cambay Basin,India; #90063 (2007)

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Predicting the Temperature of Hydrocarbon Expulsion from oil Asphaltene Kinetics and Oil Source Correlation:a Case Study of South Cambay Basin,India

 

Saxena, Shishir Kant1, R. K. Saxena1, Rashmi Anand1, K. P. Singh1, Harvir Singh2, Ram Raj Singh2 (1) KDM Institute of petroleum Exploration,Oil and Gas Corporation Ltd, Dehradun, India (2) KDM Institute of Petroleum Exploration, Oil & Natural Gas Corporation Ltd, Dehradun, India

 

The oil asphaltene has structural similarity with parent kerogen. The kinetic data based on actual data from the reservoir oil found to be a better method in reducing the risks associated with oil exploration and assessing the petroleum generation characteristics .An attempt has been made to assess the petroleum expulsion temperature/ timing for predicting the kitchen in South Cambay Basin using oil asphaltene kinetics.

 

The Gandhar field covers an area of about 800 km2 and is located on the rising northwestern flank of the Broach depression in the Jambusar-Broach block. The Olpad Formation was deposited during Paleocene age and. Cambay Shale unconformably overlies the Olpad Formation was deposited during Eocene age has excellent source rock characteristics. The Hazad members of south Cambay basin is a major hydrocarbon reservoir consist of 12-individual sand units from GS XII-GS-I.

 

The oil asphaltene kinetic/ expulsion temperature studies have been carried out on Rock eval-6 instrument and GENEX-1D software. The saturate/ aromatic biomarkers data and n-fatty acid studies are also integrated with present study. The Gandhar oils are placed in three groups. The group A oils (GS-XII & GS-XI) indicate that temperature of expulsion from asphaltene kinetics Tasph (90-1120C) correponds to isothermal sequence of source rock 2500-2800m. Group B (GS- IX-IV) oils indicate Tasph (119-1320C) correspond to isothermal sequence (2900-3200m where as Group C oils (GS-1II-I) indicate expulsion temperature (141-1420C) correspond to 3600-3800m sedimentary sequence. Asphaltene expulsion temperature data has shown positive correlation with biomarker maturity data, fatty acid distribution pattern and good matching with actual identified source units. The expulsion temperature determined by light hydrocarbon has no correlation with asphaltene expulsion temperature. This study will be very useful in fine tuning the existing petroleum system and where source rock data is not available.

 

AAPG Search and Discover Article #90063©2007 AAPG Annual Convention, Long Beach, California