Integrated fracability assessment methodology for unconventional naturally fractured reservoirs: Bridging the gap between geophysics and production

A comprehensive approach for fracability evaluation in naturally fractured sandstone reservoirs based on analytical hierarchy process method

“…The schematic diagram of RTR-1000 triaxial rock mechanics system, among which (1) represents vacuum saturation inlet, (2) represents cell base plate, (3) represents bottom platen, (4) represents cell wall, (5) represents cell tile-rods, (6) represents top platen, (7) represents cell top plate, (8) represents lvdt clamps, (9) represents loading piston, (10) represents axial load, (11) represents external lvtd's, (12) represents cell pressure inlet, (13) represents porous stone, (14) represents internal lvtd's, (15) represents sample membrane, (16) represents vacuum inlet, and (17) represents specimen Table 2. According to the data in Jinshan gas filed, YM cmin and YM cmax are 10 000 and 60 000, respectively; PR cmin and PR cmax are 0.12 and 0.4, respectively.…”

“…6 Higher fracability indicates that larger SRV will be obtained. Geng et al 15 proposed an integrated fracability assessment methodology to correlate conventional post-stack seismic data with well production rate. Originally, rock brittleness was adopted to evaluate fracability.…”

“…Fang and Amro 14 discussed the influencing factors of shale fracability, such as the sedimentary environment, mineral composition, brittleness, and natural fractures. Geng et al 15 proposed an integrated fracability assessment methodology to correlate conventional post-stack seismic data with well production rate. Kivi et al 16 established an intelligent approach to evaluate brittleness from conventional well logs and adaptive neuro-fuzzy inference system (ANFIS) was employed to develop a robust correlation of brittleness index with well logs.…”

The Main Controlling Factors and Evaluation Method of the Reservoir Stimulation Potential: A Case Study of the Changning Shale Gas Field, Southern Sichuan Basin, SW China

“…It is crucial to evaluate the complexity of hydraulic fractures. Therefore, different evaluation theories and methods have been formed, including concept evaluation using brittle mineral mass fraction (Rickman et al, 2008;Rybacki et al, 2016;Tang et al, 2016;Kumar et al, 2018;Arijit and Milan, 2019;Ayyaz et al, 2019;Vafaie and Rahimzadeh Kivi, 2020); emphasized the influence of natural weak plane, and established the threedimensional evaluation method of natural weak surface through sedimentary facies-control theory (Fu et al, 2015;Geng et al, 2016;Ou and Li, 2017;Yi et al, 2019); evaluation of rock stress-strain properties based on experiments (Jin et al, 2014;Govindarajan et al, 2017); evaluation of the potential of forming three-dimensional maps based on rock and fracture mechanics (Yuan et al, 2013;Ji et al, 2019); A brittleness ductility evaluation method considering the effect of burial depth changes in ancient and modern times (Yuan et al, 2018;He et al, 2019); Coupling evaluation of mineral and rock mechanics which carried out with consideration of petrophysical fabric (Liu and Sun, 2015); The potential evaluation method considered stress state at fracture interaction (Wang H. et al, 2016;Wang S. et al, 2016;Sheng and Li, 2016;Liu et al, 2019); A superposition evaluation method considering multiple factors was established (Tang et al, 2012;Zhao et al, 2015;Chen et al, 2017;Cui et al, 2019;Shen et al, 2017). From the perspective of engineering, some scholars proposed that stage length, operation (net) pressure, well (segment, cluster) spacing, fracturing fluid scale and performance, pumping rate and proppant dosage can also be used as evaluation indexes (Zhao et al, 2013;Huang et al, 2016;Liao and Lu, 2018).…”