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

LI Zhipeng,LIU Xiantai,YANG Yong,BU Lixia

Table 1 Mechanical parameters of different lithofacies in low- permeability reservoirs, Bonan Oilfield.

Lithology Num- ber Poisson's ratio Young's modulus /GPa Maximum Minimum Average Maximum Minimum Average Coarse sandstone 4 0.225 0.216 0.219 29.50 29.31 29.43 Fine sand- stone 7 0.198 0.189 0.193 26.81 26.52 26.70 Siltstone 4 0.279 0.258 0.267 26.22 25.13 25.69 Mudstone 4 0.372 0.361 0.366 16.34 15.42 15.97