Mineral Resources:

The grater Sylhet region is the most enriched area of Bangladesh in mineral resources. A large quantity of the total proven gas reserve and the only oil field of the country are located here. The area has also vast deposit of limestone, peat, glass-sand hard- rock grave. But the economic value of hydrocarbon reserves are overwhelmingly dominant. The region is geologically known as the Surma Basin and covers the north-eastern parts of the foredeep and Folded-Belt division of the Bengal Basin which happens to be one of the most prominent tectonically-active sedimentary basins of the world. Parts of the Sylhet region which are apparently flat having are within the foredeep division while the hilly areas are called folded Belt. Thickness of the sedimentary pile with the foredeep area is in excess of 15 kilometers; the Folded Belt representing the uplifted parts of this sedimentary pile. This huge sedimentary body is dominantly composed of sand and mud with subordinated limestone which started depositing in a deep-basement (bottom of the basin being composed of igneous-metamorphic complex) basin about 5o million years ago with the gradual rise of the Himalayas due to collision between Indian and Burmese Plates and subsequent erosion. The sand-mud composition of the sedimentary body, along with technically-developed favorable structural set up (exposed and covered folds and faults mainly) have made the Sylhet region highly potential for occurrence of natural resources. Muds act as sources, sands as reservoirs, while folds (anticlines) act as traps for hydrocarbons (gas and oil). Age of the sediments, local geothermal gradient, pressure of the overburden etc. have been sufficient for the source materials to be"cooked" to from hydrocarbon.

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