Abstract
Physical and mechanical properties of fractured sandstone reservoir present as significant anisotropy. Resistivity logging is used to evaluate oil bearing property of sandstone reservoir in production practices. Obvious deviation of resistivity value emerges in resistivity logging of fractured sandstone reservoir, which induces adverse effect on accurate evaluation of oil bearing property of reservoir. Cores in three directions along principal ground stresses were obtained with directional coring technique.
Highlights
Oil saturation is the basic data to judge reservoir quality and adjust development scheme
Fractures can induce conspicuous anisotropy in physical, mechanical, and electrical properties in sandstone reservoir, which affects the accuracy of petroliferous property evaluation
Normal stiffness of fracture is an important factor to affect the electrical property of reservoir
Summary
Oil saturation is the basic data to judge reservoir quality and adjust development scheme. Resistivity logging is used to evaluate petroliferous property of fractured sandstone reservoir in practical production process. Electrical parameters of 71 tight sandstone samples under different effective stress were determined [5]. A normalized resistivity formula of rock was introduced to compute gas saturation of fractured tight sandstone reservoir, which improved the double-porosity model [7]. In principal ground stress space, anisotropy of mechanical and electrical properties was obtained through experiments and analytical derivation. Young’s modulus, Poisson ratio, effective porosity of intact rock, and normal stiffness of fracture were determined by rock mechanics experiments. A formula based on Archie's formula was derived, which reflected the anisotropy of oil saturation in fractured sandstone reservoir. The method can be adopted to reduce logging cost and assess petroliferous property of fractured sandstone reservoir
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