Influences of lithology on in-situ stress field in low permeability reservoirs in Bonan Oilfield, Bohai Bay Basin, China

• 作者: BU Lixia LI Zhipeng LIU Xiantai YANG Yong
• 来源期刊: 石油勘探与开发:英文版
• 学科: 工学
• 关键词: lithofacies mechanical property RESERVOIR IN-SITU STRESS low PERMEABILITY RESERVOIR STRESS field Bonan OILFIELD
• 年，卷（期）: 2019,（4）
• 页码范围: 729-738
• 页数: 10页
• 分类号: TE348

摘要

The differences of rock mechanical properties were analyzed based on triaxial compression test in low permeability reservoirs of the Bonan Oilfield. Through the analysis of reservoir mechanics, the influence mechanisms of different mechanical properties of rocks on reservoir in-situ stress were studied. By means of stress ellipse and finite element simulation, the influence rules of different mechanical properties of rocks on in-situ stress field were discussed. For the low permeability reservoirs of the Bonan Oilfield, the coarser rock has a larger Young’s modulus value and a lower Poisson’s ratio. The rock mechanical parameters and stress-strain relationship of sandstone facies and mudstone facies are different. Different rocks have different mechanical properties, which cause extra stress at the lithological contact interface, and the existence of extra stress affects the reservoir in-situ stress. Without considering the influence of structural features on the in-situ stress field, the reservoir in-situ stress is controlled by the magnitude of extra stress and the angle between lithological contact surface and boundary stress.