Abstract

This study emphasizes the significance of accurately estimating dry rock elastic properties, which is crucial for reservoir fluid flow and storage feasibility assessments in carbonate rocks. However, accurately estimating these properties, especially in carbonates prone to dissolution and reprecipitation during reservoir production cycles, is challenging. Core samples and well logs are typically used to estimate dry rock properties, but uncertainties in log quality and inversion processes make laboratory measurements on core samples more reliable. The research highlights the importance of textural variation for categorizing carbonate formations into homogeneous, intermediate, and heterogeneous facie classes. Utilizing ultrasonic measurements for compressive and shear wave velocity, this study reveals how morphological changes due to texture alterations significantly impact measured and calculated values of velocity, dominant frequencies, and seismic rock property attenuation. The observed ultrasonic P- and S-wave velocities range from 2.62 to 5 km/s and 1.9 to 2.91 km/s, respectively. Dominant frequencies vary between 0.25 MHz to 0.75 MHz, while attenuations (1/QP) exhibit values ranging from 0.6 to 0.05, illustrating pronounced differences as formations move from a heterogeneous to a homogeneous facie class. These findings provide valuable insights into understanding the influence of dry rock strength on modeling saturated seismic rock properties for feasibility investigations.