Tech Division Events
International Division
There is no charge for International Division Talks. Please bring your lunch. The facilities for the talk are provided complimentary of EnCana and refreshments by Geochemtech Inc. For further information or if you would like to give a talk, please contact Bob Potter at (403) 863-9738 or ropotter@telusplanet.net or Trent Rehill at (403) 606-6717 or trehill@kulczykoil.ca.
Division Profile
The International Division has been running since the early 1990's.The Division mandate is to provide a CSPG forum for members who are interested in learning more about the geology and hydrocarbon potential of countries other than Canada. This is achieved by holding regular technical presentations and social events. The technical presentations vary between offering detailed investigations of specific basins or hydrocarbon provinces to more general overviews of a particular country. The talks always aim to offer some general interest geology (including elements of sequence stratigraphy, basin formation, structural geology, etc.), general interest geography, and personal insights on the cultural aspects of other countries. Also included are thoughts on the philosophy and economic imperatives of doing business in foreign places.
Our meeting schedule is to have one informal brown-bag talk every month except during the summer. Talks normally start at 12:00 noon and finish at 1 pm. Each meeting consists of a 10-15 minute "Rock Shots" warm-up presentation followed by a 30-40 minute "Main Event" technical presentation. Currently, our meetings are held on the second floor of the Calgary tower in the EnCana Amphitheatre.
Involvement of our CSPG members is the key to the success of the Division. Individuals are encouraged to take part in all activities. Service companies, students and non-CSPG members are also encouraged to attend Division meetings. The Division Chairs are Robert Potter and Trent Rehill.
If you are interested in joining our mailing list and learning more about the International Division please contact Bob at (403) 863-9738 or ropotter@telusplanet.net or Trent at (403) 606-6717 or trehill@kulczykoil.ca. Or visit our Facebook page ("CSPG International Division").
Division Talks
Tectonics and Hydrocarbon Systems of the East Gobi Basin, Mongolia
Speaker
Dr. Gary L. Prost,
ConocoPhillips Canada
12:00 Noon
Wednesday, March 10, 2010
EnCana Amphitheatre, 2nd floor
East end of the Calgary Tower Complex
1st Street and 9th Avenue S.E.
Calgary, Alberta
Abstract
Mapping and seismic data in the East Gobi basin reveal a structural and burial history for basins adjacent to the Zuunbayan and Tsagaan Els oil fields. The tectonic framework was combined with available well and outcrop data to model the timing and magnitude of hydrocarbon generation.
Five structural episodes are recognized: 1) pre-Jurassic northeast-directed shortening that formed the tectonic fabric; 2) Middle Jurassic to Early Cretaceous rifting along northeast trends that formed the sub-basins of the East Gobi Basin; 3) late Early Cretaceous north-south shortening and inversion on existing normal faults; shortening caused left-lateral and reverse displacements on northeast-trending faults; 4) middle Cretaceous uplift and erosion, followed by 5) east-west shortening and right-lateral movement on northeast faults. Folds formed by inversion over Late Jurassic-Early Cretaceous normal faults.
Modeling suggests that the bituminous member of the Zuunbayan Formation should be mature over large areas. Oil migrated from mature source areas toward several traps, including the Zuunbayan and Tsagaan Els fields. Modeling suggests that early oil was generated in the Zuunbayan and Tsagaan Els area because of Cretaceous burial. Although generation began in Early Cretaceous, peak generation occurred between 100-90 Ma. Generation continued at a decreasing rate to the present. Kerogen maturity suggests that oil is the most likely product. Calculations of hydrocarbon volumes generated indicate that the Unegt basin may have generated up to 86 billion BOE.
Biography
Gary Prost received his Ph.D. in Geology from the Colorado School of Mines and works for ConocoPhillips Canada. He has held Team Leader positions for both the Parsons Lake Gas Development Project and recently the Arctic Exploration program. Over 28 years in the energy industry, he has worked for the U.S. Geological Survey, Superior Oil, Amoco, and Gulf Canada and is author of Remote Sensing for Geologists and English–Spanish Glossary of Geoscience Terms.
The Geology, Geophysical Definition and Reservoir Characteristics of Oil and Gas Fields Producing from Basement Reservoirs: Examples from Asia – Vietnam, China and Indonesia
Speaker
Tako Koning,
Advisor Tullow Oil Luanda, Angola
12:00 Noon
Wednesday, April 21, 2010
EnCana Amphitheatre, 2nd floor
East end of the Calgary Tower Complex
1st Street and 9th Avenue S.E.
Calgary, Alberta
Abstract
Basement rocks are important oil and gas reservoirs in various basins in the world including the West Siberia Basin, Middle East (Yemen), North Africa (Libya, Algeria and Egypt), South America (Brazil and Venezuela) and the USA (California, Texas and Kansas). The reservoirs include fractured and weathered granites, quartzites and metamorphics. This presentation will focus on select oil and gas fields in Asia.
Most of Vietnam's oil production is from fractured granite basement in the Cuu Long basin with six major oil fields producing primarily from basement. Overlying and adjacent Oligocene lacustrine shales generated the oil which migrated into the fractured basement. Bach Ho (White Tiger) is a giant field with recoverable reserves of 1.0 - 1.4 million barrels of oil. Other fields include Rong, Rang Dong, Ruby and Su Tu Den with oil reserves ranging from 100 to 400 million barrels (reference: Hoan Vu JOC, AAPG 2004). The Ca Ngu Vang (CNV) field, discovered in 2002 is the deepest oil-bearing structure in the basin, where the top of basement is at a depth of 3,700 meters. Indeed, the CNV-3X well was the longest measured depth well drilled in Vietnam (6,123 meters) with over 2,000 meters of basement penetrated in a near-horizontal well and was tested at 13,040 BOEPD.
The Dongshenpu field, onshore central China is presented as an example of a Chinese "buried hill" basement oil field. This field was discovered in 1983 and the reservoir consists of Precambrian granites, granulites, diabases and hornblendic metamorphics (Guang & Zuan, AAPG, 1991). The rocks have no primary porosity but the porous reservoirs are due to weathering and fracturing. The discovery well tested at 1,570 BOPD and subsequent development drilling has proven the oil column to be 400 meters thick.
To date in Indonesia, oil production from basement rocks has been minimal but major gas discoveries in South Sumatra totaling some 5 TCF (Suban gas field) have been made in pre-Tertiary fractured granites. This has led to further exploration for gas in basement due to the need for more gas as the Indonesia economy continues to expand. The largest oil accumulation in basement in Indonesia is the Tanjung oil field in Kalimantan. This field has produced over 70 million barrels of oil from overlying Eocene sandstones and conglomerates and it has also produced over 20 million barrels of oil from basement rocks including weathered volcanic, pyroclastics and metasediments.
Although this presentation mostly reviews "success stories" about basement reservoirs, there are also failures since these reservoirs can be very complicated. Accordingly, the Beruk North East oil field in Central Sumatra will be presented as a small basement oil pool (approximately 2 million barrels cumulative production) which appeared promising based on initial flow rates but where subsequent development drilling and production proved the field to be barely commercial. This presentation will also present "best practices" for exploring for and producing oil and gas from basement reservoirs. This includes the need for adequate depth penetration by drilling (not just tagging into the top of basement), specialized 3D seismic to highlight the dominant fracture systems in the basement, and the need for optimally placed horizontal wells.
While oil and gas fields in crystalline basement are still discovered mostly by accident, there are a few companies which have been especially successful in their focused exploration effort in basement such as Soco International in Vietnam and Yemen. Very noteworthy also has been recent (2009) disclosures by Hurricane Exploration Plc about its highly significant Lancaster (West of Shetland) oil discovery in fractured Precambrian basement in the North Sea which to date has had no oil or gas produced from basement. This presentation concludes with the comment that it is surprising that no oil or gas has ever been produced from basement in the highly prolific Western Canada Sedimentary Basin. Perhaps this is because no companies have ever carried out a deliberate and highly focused exploration program for oil and gas in basement rocks in the Western Canada Basin.
Biography
Tako Koning is Holland-born and Alberta-raised with a B.Sc. in Geology from the University of Alberta (1971) and a B.A. in Economics from the University of Calgary (1981). He worked as a geologist and manager for Texaco for three decades in Canada, Indonesia, Nigeria and Angola. In 1982 he was involved with the development of the Beruk North East basement oil pool in Sumatra and has had an abiding interest in basement reservoirs since that time. He has written papers on oil and gas in basement in the proceedings of the Indonesian Petroleum Association and in Special Publication 214 "Hydrocarbons in Crystalline Rocks" published in 2003 by the Geological Society of London and he has given presentations on this subject matter at conferences worldwide. Koning has lived and worked in Angola since 1995 where he is currently advisor for Tullow Oil and he also is residential representative for Yme Foundation (www.yme.no), a Norwegian humanitarian organization drilling water wells in rural areas of Cabinda province, northern Angola.
Information
There is no charge for International Division Talks. Please bring your lunch. The facilities for the talk are provided complimentary of EnCana and refreshments by Geochemtech Inc. For further information or if you would like to give a talk, please contact Bob
Potter at (403) 863-9738 or ropotter@telusplanet.net or Trent Rehill at (403) 606-6717 or trehill@kulczykoil.ca.
