Predicting the
Temperature of Hydrocarbon Expulsion from oil Asphaltene
Kinetics and Oil Source Correlation:a
Case Study of
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
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