A Short Course held on December 05th ,2012 at the Lecturer Meeting Room of Institute Technology Medan with the title “Basic Petroleum Geochemistry & Job Career Sharing Knowledge”, attended by 95 students of Geology include Mining, and lecturer from two departments. The objectives of this course to get the good-shaped knowledge on Petroleum Geochemistry and also sharing about career. In this event, Mr. Fuad Ahmadin Nasution as Exploration Geologist Total EP, acted as the speaker.
This event opened by Head of Geological Engineering Department Institute Technology of Medan is Mr. Gustam Lubis. ST, MT, with proudly say thanks to Total EP for coming to Institute Technology of Medan for sharing knowledge and information to Geology and Mining students. We believed that course already increased the knowledge and skill in oil and gas industry. Another welcome speech was coming from Mr. Ir. Eka Onwardana, MT as Faculty Advisor of GITMSC of AAPG said gladness and thank to Total EP and him for theirs visit to Institute Technology of Medan also as alumnus of ITM. In addition, Mr. Ir. Eka Onwardana, MT appreciate the students to attend the short course.
Total EP is a big company in the world whisch is the headquarter of Total EP is in La Defense, Paris – France and operated in more than 130 countries and use more than 3000 employements. In Indonesia, Total EP have 7 (seven) field as follow as Tunu, Sifi – Nubi, Tambora, Peciko, Handil, South Mahakam, Bekapai with > 2000 wells. If one well dry, Total EP operation leave that well and looking for other well.
Basic Petroleum System and Petroleum Geochemistry
Petroleum system is the essential elements and processes and all genetically related hydrocarbon that occur in petroleum shows, and accumulations whose provenance is a single pod of active source rock.The petroleum system elements such as Source rock with generation process, Migration route with migration process, reservoir rock with accumulation process, seal rock with preservation process also trap with timing critical.
Petroelum Geochemistry is application of chemical principles to the study of the origin, migration, accumulation, and alteration of petroleum (oil and gas) and the use of this knowledge in exploring for and recovering petroleum. (Hunt, 1996). With petroleum geochemistry predict the fluid (oil/gas/water) in a prospect ahead of drilling in terms of its phase (liquid/gas), composition (GOR, CGR, sulphur, wax, etc.), and properties (API gravity, viscosity), determine volumetrics of petroleum generated, migrated, and accumulated in a basin, determine how many oil and gas families are present in a basin,
relate those oil and gas families to known source rocks and basin geology, predict in-reservoir alteration (e.g. biodegradation, oil to gas cracking), predict/understand intra-field/-reservoir petroleum variations, and predict lithological variations in a prospect and overpressures ahead of drilling.
Through geochemistry can to calculate the estimation reserves because if we have reserves from geochemistry calculation but we have a place (limited or not). predict the fluid (oil/gas/water) in a prospect ahead of drilling in terms of its phase (liquid/gas), composition (GOR, CGR, sulphur, wax, etc.), and properties (API gravity, viscosity), determine volumetrics of petroleum generated, migrated, and accumulated in a basin, determine how many oil and gas families are present in a basin, relate those oil and gas families to known source rocks and basin geology, predict in-reservoir alteration (e.g. biodegradation, oil to gas cracking), predict/understand intra-field/-reservoir petroleum variations, and predict lithological variations in a prospect and overpressures ahead of drilling. Source Rock Richness is determined by measurement of the Total Organic Carbon content of the rock (Leco Analyser). Source rock have Total Organic Carbon : Poor <0.50%, Fair 0.50% – 1.00%, Good 1.00% – 2.00%, Very Good 2.00% – 4.00%, Excellent >4.00%. In general, shales with less than 0.50% TOC or carbonates with less than 0.20% TOC will not be good source rocks and are not worthy of further study. An exception to this, however, is if a rock contains a predominance of algal kerogen (highly oil prone), in which case lower TOC values can still be considered.
Fault zones can act as both conduits and barriers to secondary migrtion. The material crushed by the frictional movement of the fault, the fault gouge, is frequently impermeable and does not allow the passage of petroleum. Clay smeared along fault planes also blocks petroeum migration. Fractures formed in either the footwall or hangingwall, if they remain open, may form effective vertical migration pathways. This may occur in the uplifted hangingwalls of compressive faults on release of compressive stresses. Tensional fractures in the crestal zones of anticlinal structures may also allow migration of petroleum. Lateral migration will tend to be inhibited by the presence of faults, since they interrupt the lateral continuity of the carrier bed.