Stress Prediction Technology Based on AVAZ Inverison and its Application in Sichuan Basin of China

In this paper, we mainly talk about stress prediction technology, it has proven to be important and effective for shale gas evaluation and development. We use pre-stack AVAZ inversion to predict stress field, it is carried on pre-stack azimuthal gathers with constrained wells. A slight modification was made on the basis of Shaw’s (2004) equation in order to obtain elastic parameters such as P-wave impedance, S-wave impedance and fracture weakness from inversion. The stress indicator like DHSR (Differential Horizontal Stress Ratio) can be further estimated with P-wave impedance, S-wave impedance and fracture weakness. This work could help geophysicists and engineers better understand where engineer “sweet spot” is and guide well deployment. This method is applied in real data of Sichuan Basin, it shows that the result of stress prediction is effective and reasonable.