Analysis of the geological structure and hydrocarbon fields development for the Caspian Sea aquatory (by example of Palchig Pilpila field)

This article presents the step-by-step analysis of the development of the Pre-Kirmaki-1, Pre-Kirmaki-2 and Pre-Kirmaki-3 horizons of the Palchig Pilpila field. It is part of the Absheron oil and gas region. Objects being examined belong to the PK (Pre-Kirmaki) suite. Despite the fact that the horizons have been developed for a long time, more than 60 years, there are sufficient residual oil reserves, while estimated 18,508 thousand tons. Currently, the oil recovery factor is 0.07%. In addition, the article provides general information about of the stratigraphy, tectonics, thickness, lithological composition, reservoir properties, oil and gas content, reservoir pressure, temperature, reserves developed PK horizons and development analysis carried out. This article also talks about increasing the final oil recovery factor of the object, by using enhanced oil recovery (EOR) methods, and also calculates the additional amount of oil obtained after application of new methods. This article shows the necessary measures for the effective completion of development process, identification of the developed object as a result of the analysis. The established initial balance reserves of oil are estimated at 19,571 thousand tons. At the beginning of development, 1,063 thousand tons of oil, 320.8 thousand m3 of water, 1,383.6 thousand tons of liquid have been produced from the PK suite. The average gas factor of the suite is 73.5 m3 / t. Remaining reserves in-place of oil are 18,508 thousand tons, remaining recoverable reserves of oil are 1,287 thousand tons. The final oil recovery factor is 0.12. To increase oil recovery in the horizons of the PK suite of the Palchig Pilpila field, the following thermal methods should be used such as steam and hot water exposure, which will produce an effect of 20% and 4-10%, respectively. Thus, it is determined that deposits are developed by the low-efficiency dissolved gas regime, combined with weak water pressure in individual layers, contributed to low and uneven development of reserves. To achieve higher oil recovery, it is necessary to further develop the deposit. It is advisable to plan further development activities after drilling appraisal wells in various parts of the deposit, having carried out core sampling and a full range of geological and geophysical studies.