نوع مقاله : مقاله تحقیقی (پژوهشی)
1 دانشجوی دکترای گروه مهندسی نفت، معدن و ژئوفیزیک دانشکده مهندسی عمران و منابع زمین دانشگاه آزاد اسلامی واحد تهران مرکزی، تهران، ایران
2 استادیار گروه زمین شناسی دانشکده علوم پایه دانشگاه آزاد اسلامی، واحد چالوس، چالوس، ایران
3 استاد گروه فیزیک دانشکده علوم و فن آوری های همگرا، دانشگاه آزاد اسلامی واحد تهران مرکزی، تهران، ایران
عنوان مقاله [English]
The inversion of gravity data is one of the most important topics in the quantitative interpretation of practical data, since construction of density contrast models could increase the amount of information that can be achieved from the gravity data.
This study shows the gravity response to the assumed model. In this model, , where tthe sub-surface ground has been partitioned into 15×10 prisms ands the dimension of each prism is 20 m × 5 m. As is shown, the 2D model includes 9 prisms whose density contrast is 1000 kg/cm3. The inverted gravity correspondings to the resulted causative body from inverting the observed gravity. This inverted model that is corresponding to the exactly similar of to the original causative body, achieved at 4th iteration, where the L2 norm as the stopping criterion attained the smallest amount. We have used the reweighting focusing inversion method for inverting the gravity horizontal gradient data. The computed density distributions are located on the vertical borders of the sub- surface mass. The gravity horizontal gradient related to the assumed model. The inversion response to the gravity horizontal gradient related to the assumed model is demonstrated, asshows the estimated densitiesy are situated on the vertical edges of the model. The L2 norm of the as shows gravity horizontal gradient is 0.0036 mGal/m.
We have applied the reweighting focusing inversion algorithm to invert the 2D gravity and its horizontal gradient data related to a salt dome situated in the Aji Chay, East Azerbaijan Province, Iran.from Iran.The calculated gravity horizontal gradient has been shown, where the L2 norm is 0.0833 mGal. The real gravity is related to a salt dome, situated in the Aji Chay, East AzerbaijanProvince, Iran. Salt domes in this region in terms of potash reserves are significant in terms of potash reserves. The inverted density contrasts for the sub- surface salt dome. We have applied the reweighting focusing inversion algorithm to invert the 2D gravity and its horizontal gradient data related to a salt dome from Iran. The method has been tested for a theoretical gravity set data, with and without added random noise random. The results demonstrate the ability of the reweighting focusing inversion method in recovering subsurface density contrast distribution and detecting the vertical border.