The Effect Of Ductile-Lithic Sand Grains, Overpressure And Secondary Dissolution On Porosity And Permeability And Their Relevance To Hydrocarbon Exploration In Askale Sub-Basin, East Anatolia, Turkey

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Journal Article: The Effect Of Ductile-Lithic Sand Grains, Overpressure And Secondary Dissolution On Porosity And Permeability And Their Relevance To Hydrocarbon Exploration In Askale Sub-Basin, East Anatolia, Turkey

Abstract
Ductile lithic grain, secondary porosity, temperature, and overpressure control porosity and permeability in the Mio-Pliocene and Upper Oligocene sandstones of the Askale sub-basin in East Anatolia. Ductile lithic grains account for between approximately 60-90% of the original sand grain population. There is a pronounced loss of porosity with increasing bruial depth in this sub-basin. At depths of less than 3000 m, this is due solely to ductile-lithic grain compaction where the rate of porosity loss of with depth increases with increasing ductile-lithic grain content. But at depths greater than 3000 m, the steep porosity increases with depth due to secondary solution activities and overpressure in the Askale sub-basin in East Anatolia. Secondary porosity is a common diagenetic feature in the more deeply buried (>3000 m) sediments in the Askale sub-basin. The secondary porosity arises principally from dissolution of feldspar, to a lesser extent, of the quartz (approximately 10-30%). Overpressure is due to tectonic stress. Reservoir quality is thus controlled by secondary solution activities, overpressure, temperature (geothermal gradient) and depth of burial in the Askale sub-basin in East Anatolia Basin.

Authors 
A. G. Buyukutku and O. Sahinturk








Published Journal 
Energy Sources Part a-Recovery Utilization and Environmental Effects, 2006





DOI 
Not Provided
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Citation

A. G. Buyukutku,O. Sahinturk. 2006. The Effect Of Ductile-Lithic Sand Grains, Overpressure And Secondary Dissolution On Porosity And Permeability And Their Relevance To Hydrocarbon Exploration In Askale Sub-Basin, East Anatolia, Turkey. Energy Sources Part a-Recovery Utilization and Environmental Effects. (!) .