+ Site Statistics
+ Search Articles
+ PDF Full Text Service
How our service works
Request PDF Full Text
+ Follow Us
Follow on Facebook
Follow on Twitter
Follow on LinkedIn
+ Subscribe to Site Feeds
Most Shared
PDF Full Text
+ Translate
+ Recently Requested

Relation between petroleum accumulations and hydrogeothermics in Tunisia



Relation between petroleum accumulations and hydrogeothermics in Tunisia



ETAP's Memoir Series 5(Pages 1-47



The possibility that positive geothermal anomalies and hydrocarbon occurrences in deep sedimentary basins are genetically related to formation-water flow has been suggested by various authors in recent years. These suggestions have been corroborated by several studies in the central and the Saharan parts of Tunisia. In Central Tunisia, 8 of 10 known major accumulations are located within a region of positive geothermal gradient anomalies ranging from 35 degrees to 45 degrees C/Km. At a larger scale and for the whole Tunisia, it is noteworthy that temperature gradients are relatively low in the older reservoirs (25 degrees to 30 degrees C/km for Paleozoic fields), while they are high in the Tertiary fields (52 degrees C/km). The Douleb (Aptian) and Sidi Lytaiem (Ypresian) fields are located in areas of formation-water convergence and discharge. Other areas of flow convergence have been recognized from hydrogeological studies but their oil-potentials have not yet been assessed. In the Saharan region, including parts of Algeria, background heat flux is approximately 80 mWm-2, whereas the actual values range between 60 and 140 mWm-2. The anomalies appear to be due to regional formation-water flow, with the low values being associated with recharge areas (Algerian Tinrhert and High Plateaux), and the high ones with discharge areas (Tunisian Jeffara and Algerian Reggane). The hydraulic perturbation of the normal heat flux is estimated to be on the order of 10 to 20 mWm-2. The main vehicle for the transport of both heat and oil appears to be, therefore, regional formation-water flow. The role of the water in thermal perturbation is clearly demonstrated by the shallow geothermal studies showing that discharge zones are characterized by shallow hot water, high apparent geothermal gradient and low topography. While recharge zones are characterized by shallow cold water, low apparent geothermal gradient and high topography.

Please choose payment method:






(PDF emailed within 1 workday: $29.90)

Accession: 019885923

Download citation: RISBibTeXText


Related references

Hydrogeothermics of the Tunguska gas-petroleum basin. Izvestiya Vysshikh Uchebnykh Zavedeniy Geologiya i Razvedka, 1985

Organogeochemistry and its relation to the geology of petroleum accumulations in Japan. Pages 79 1970, 1970

Petroleum accumulations of the Eromanga Basin: a comparison with other Australian Mesozoic accumulations. Pages 371-389 1989, 1989

Relation of thorium-normalized surface and aerial radiometric data to subsurface petroleum accumulations. Geophysics 58(10): 1417-1427, 1993

Post-Paleocene evolution of regional groundwater flow-systems and their relation to petroleum accumulations, Taber area, southern Alberta, Canada. Bulletin of Canadian Petroleum Geology 34(3): 339-363, 1986

Post Palaeocene evolution of regional groundwater flow systems and their relation to petroleum accumulations, Taber area, southern Alberta, Canada. Geological Society Special Publications 34: 45-77, 1987

The role of petroleum- and gas-bearing complexes and the formation of petroleum and gas accumulations. Pages 239-242 1979, 1979

Petroleum accumulations from gas hydrate; implications for petroleum exploration in paleoplatforms. Experimental Petroleum Geology 31.1, 2009

The character and geologic conditions of petroleum and gas occurrences in the Chatminskiy Anticlinorium and some specific features of locating exploitable accumulations of petroleum and gas. Izvestiya Vysshikh Uchebnykh Zavedeniy Neft' i Gaz, 1970

Giant petroleum accumulations in the Volgian-Neocomian deposits of western Siberia; a complete petroleum system within a second order depositional sequence. Annual Meeting Abstracts - American Association of Petroleum Geologists and Society of Economic Paleontologists and Mineralogists 4: 48, 1995

The formation of large zones of petroleum and gas accumulations in foreign petroleum- and gas-bearing basins; North and South America, the Algerian Sahara, the Near and Far East. Trudy - Zapadno-Sibirski Nauchno-Issledovatel'skiy Geologorazvedochnyy Neftyanoy Institut 137): 73-80, 1978

Rock disturbances theory of petroleum emanations vs. the anticlinal or structural theory of petroleum accumulations (with discussion by Hans von Hoefer). Transactions of the Society of Mining Engineers of American Institute of Mining, Metallurgical and Petroleum Engineers, Incorporated (AIME) Pages 2415-2431, 1914

Tectonic setting and hydrocarbon accumulations in Tunisia. Annual Meeting Abstracts - American Association of Petroleum Geologists and Society of Economic Paleontologists and Mineralogists 1994: 203, 1994

Nummulite accumulations in central Tunisia; dynamics of their sedimentation. Gaea Heidelbergensis 3: 127-128, 1997

Discovery of the Ezzaouia and Robbana accumulations, Gulf of Gabes, Tunisia. AAPG Bulletin 74(5): 750, 1990