A new approach for post-fracturing evaluation and productivity prediction based on a reservoir fracability index model in shale gas reservoirs

Abstract Multistage fracturing technology is the primary means of reservoir stimulation in shale gas wells. However, productivity contribution each stage varies greatly. It essential to evaluate effect order make an optimized treatment design. In this study, we adopted integrated workflow assess main control factors geological and engineering parameters a novel approach was proposed for post-fracturing evaluation. For purpose, H block Zhaotong demonstration zone Sichuan, China, has been taken as object study. The production predicting model built based on fracability index (RFI) which took both fluid type proppant size differences into consideration. results demonstrated that (1) if quality (RQI) target greater than 5.0, then area good development potential. (2) RFI Block generally at 4.0–6.0, it can be used key parameter screen out sweet spot. This method not only serves set practical evaluation methods but also prediction optimization methods, provide strong support reservoirs.