Keywords : Mishraq

Environmental Study in Mishraq-1 Sulphur Field from 2DRI and ARS

Bashar A. Al-Juraisy; Marwan Mutib Thabit D. Mahder-Bashi

Iraqi National Journal of Earth Science, 2009, Volume 9, Issue 2, Pages 1-16
DOI: 10.33899/earth.2009.5491

The study includes the environmental impact of three decades of extraction of Mishraq's Sulphur using offset Wenner measurements by two main methods. The first method is applying 2D resistivity imaging through four lines.Line-1 (800m.length) and line1-1 (99m.length) are situated relatively far from the extraction sites .The results show the resistivity values of subsurface rocks were in agreement with their values calculated from the borehole resistivity logs, which assert the absence of effect for the process of extraction on the rocks at those sites.While Line-2 (800m.length) and line2-1 (99m.length) were fixed near the extraction site. The results obtained show that the resistivity values of most Fat'ha Formation rocks decreased substantially in comparison with those values calculated from the borehole resistivity logs before the process of extraction, which proves the effect of extraction on those rocks.
The second method was done by conducting Azimuthal Resistivity Survey in two regions, one (A1) far from the extraction site, and the other (A2) was near from it. The former results have given a good information which helped in determining some directions of the subsurface fractures, while the results of the latter have indicated that the loss of fractures was due to the effect of subsidence following the process of sulphur extraction.

Detecting the water-bearing zones by the temp.-log at Mishraq

Thabit D. Mahder-Bashi

Iraqi National Journal of Earth Science, 2002, Volume 2, Issue 1, Pages 62-73
DOI: 10.33899/earth.2002.43832

Al-Fat'ha formation at mishraq structure considered from the hydrogeological point of view as one of the most complicated multiple aquifer, where containing cavities and the water zones formed by the action of dissolution and alteration of evaporate rocks to sulphur, the thickness ranges from 1 m to 10 m and their number exceeding 10 zones. Temp. profiles were observed in 20 hydrogeological boreholes to locate the distribution of water bearing zone vertically by the infection in the temp. profiles
Temp profiles are classified into four types according to their patterns of variation in temperature gradient with depth. It has been found the degree of inflection and the changes in temperature gradient have a relation with the hydraulic properties and ground water movement horizontally and vertically between the aquifers.