Oi̇l and Gas Prospects Based on the Reservoir Characteri̇sti̇cs of the Western Absheron Fi̇eld

The Western Absheron structure that confined the field is 9.5 km, the width is 3 km, at the time the area of its 20.9 km is concidered. The Western Absheron fold was identified as a result of seismic exploration works conducted in 1958-1959. Initially, the industrially important oil flow was obtained from the field in 1985 from prospecting well 35, during testing of the well section. The modern sediments and the Oligocene age sedimentary complex were uncovered and studied in the cross-section of the field. Modern sediments consist of limestones with seashells and quartzose sands. Its thickness reaches up to 30 m. The Productive series section consists of sandy-clayey, sandy, aleuritic layers of different thicknesses, as in other oil-gas fields of Absheron. The productive oil formations are confined to the Subkirmaki and Kirmaki suites. Two parallel longitudinal faults pass through the crest part of the structure, which causes its crest part to rise and form a horst type of fault. Due to the northeast limb is steeper than the southwest one. In the northeast limb of the structure, Productive series sediments were identified, which unconformably rests on the Miocene sediments. Productive series sediments consist of clays and sand with sandstone interlayers. The oil reserve of the field was calculated by volume method while performing a number of research works. It was determined that the initial balance reserve of oil in the field increased by 17.77%, the initial recoverable reserve of oil increased by 29.6%, and the initial recoverable dissolved gas reserve decreased by 71.7%. Oil reserve in the field was calculated by category B+C1+C2. According to this calculations the initial balance reserve is 76,123.2 thousand tons, the initial recoverable reserve is 16,019 thousand tons, cumulative oil reserves is 264,6 thousand tons, the remaining balance is 75,858,6 thousand tons, the remaining recoverable is 15,754.4 thousand tons. The initial balance reserve of dissolved gas in oil is 2,779.7 million m3; the initial recoverable 576.9 million m3, and the cumulative gas reserve is 10.2 million m3. As well as remaining balance reserves are 2,769.4 million m3, the remaining recoverable are 566.6 million m3. Keywords: cumulative gas reserve, initial balance reserve, remaining balance, fold, seismic exploration works, Productive series sediments.