RESERVOIR CHARACTERIZATION OF LOWER GORU SANDS AT MIANO AREA USING MODEL BASED INVERSION TECHNIQUE, CENTRAL INDUS BASIN, PAKISTAN

Abstract

Fields that are significantly producing hydrocarbons in the Central Indus Basin has Miano in the category too. Real goal of this exploration was to describe the reservoir potential and to further exploit the reservoirs of Lower Goru B Sands. These channel sands dependably put a challenge before geoscientists to exploit the reservoirs that are channeled in such a territory for the assessment of hydrocarbon potential. To determine this issue, this exploration work uses the advanced seismic methods like seismic inversion and seismic attribute analysis alongside the help of seismically interpreting and petrophysical examination of Miano region, Pakistan. The available data helps in defining the physical attributes of the reservoir with the help of certain types of modelling techniques. The simulated behavior of fluids in reservoir modelling provide a head start to the Exploration and Production companies to progress their optimal production techniques. Not one but different geophysical techniques are brought into use to attain accurately characterized reservoirs, including the correlation of the results. At the level of Lower Goru B Sands negative flower structure (strike slip component) is observed. At the level of Lower Goru B Sands fault blocks that are tilted in NE-SW orientation with a two-way dip closure exists. Horsts graben structures are also observed at the level of Lower Goru B Sands. In compartmentalizing the reservoir, NW-SE trending faults plays a fundamental role. Petrophysical investigation demonstrated that at least one reservoir zone having sufficient thickness and hydrocarbon saturation in each Miano well is possibly sufficiently stable to deliver at commercial level. Comparison of different frequency ranges with9 Lower Goru B Sands response was made using spectral decomposition, the response indicated inverse relation between frequency and sand beds thickness. Using spectral decomposition clear zones of sand bodies having channeled geometries are stipulated. Bright spots are marked with the help of instantaneous amplitude attribute at Lower Goru B Sands hence making it a potential reservoir zone of Miano area. Different seismic inversion methods based on acoustic impedance variation over the investigation region and porosity calculation unmistakably upgraded the sweet spots eastbound way at Lower Goru B Sands level which is solid for encouraging improvement of this field.