Increasing hydrocarbon production within the Krukenytsia depression of the Bolshe-Volytska zone of the Fore-Carpathian trough

Abstract

Increasing hydrocarbon production in Ukraine requires the development and introduction of new promising methodological and technological means of petrophysical support and drilling support for exploration areas based on modern scientific and technological achievements. The analysis of the geological structure of lithological and stratigraphic strata of the Neogene Krukenytska system of the Bilche-Volytska depression of the Precarpathian trough confirmed that each individual case has its own peculiarities both in the structure of the rock matrix and in the conditions of its formation. Based on the results of the analysis and evaluation of the quality of interpretation of physical parameters of geophysical surveys of complexly structured reservoir rocks of Neogene sediments, the influence of clay content, temperature and reservoir pressure on the readings of electrical, radioactive and acoustic measurements of mineralogical composition was established. Electrometric methods, which are part of a typical GDS complex, have their limitations when recording resistivity values, in particular, insufficient resolution and ambiguity in assessing the nature of saturation when studying complex reservoir rocks. In the process of assessing the nature of saturation of complexly constructed reservoir rocks of Neogene sediments, the presence of water-saturated rocks in the roof of gas-saturated formations without a continuous lintel was revealed, which also causes watering of productive horizons, thus reducing gas and condensate production. The sandy rocks of the Lower Dashava subsurface are characterized, in addition to normal interbedding, by the presence of hydrocarbon accumulations in lens-shaped traps with various petrophysical parameters. The established features of the geological structure of Neogene lithologic and stratigraphic strata confirm the complex geology of Neogene and Paleogene rocks and cause complications in geological and geophysical studies in exploration wells.

Keywords

• petrophysical parameters
• filtration and capacitance parameters
• calibration screen
• acoustic impedance
• wave velocity