A delicate calculation method for reservoir initial water saturation based on a novel approach to J-function construction.

ABSTRACT: Accurately determining initial water saturation is essential for assessing reservoir resources and optimizing development, yet conventional J-function methods face challenges such as variability in curve fitting due to sample heterogeneity, less-than-optimal grouping schemes, and limited core sample availability. This study addressed these issues by analyzing 55 J-function curves from the N reservoir in Iraq's Zagros Basin, identifying permeability as the primary factor influencing curve shape. A novel classification method was developed, categorizing curves into power function and exponential function types based on permeability thresholds. Improved J-function models were established by correlating undetermined coefficients with the reservoir quality index (RQI), enabling continuous, tail

SUBMITTER: Liu X 

PROVIDER: S-EPMC12410822 | biostudies-literature | 2025

REPOSITORIES: biostudies-literature