Relationship between fissility, composition, rock fabric and reservoir properties in Vaca Muerta Formation (Neuquén Basin, Argentina): from outcrop to subsurface core data

The fissility is the ability of some rocks to split along relatively smooth surfaces parallel bedding. This property observed mostly in fine-grained particularly expressed outcrops, where are subjected weathering processes. Most authors associate abundance clay minerals and their orientation horizontal fabric can be promoted by depositional conditions such as sediment composition, quantity total organic carbon content (TOC) mechanisms, giving rise a primary fissility. Alternatively, alignment platy linked burial history rock, processes mechanical compaction or secondary mineral growth, resulting present study aims identify main controls development at micro- macroscopic scale Vaca Muerta Formation exposed Cerro Mulichinco area 121-meter-long core extracted from well within Neuquén Basin. In related laminated facies with low carbonate content, revealing strong control exerted lithology. TOC measurements allow establishing positive correlation between matter intensity. Moreover, analysis transgressive-regressive cycles shows that higher around maximum flooding surfaces. Regarding characteristics, different interfaces classified into first second-order, last one including planes. Some these evolve potential (partially open) effective (totally discontinuities response changes stress during extraction due relaxation through time: weeks (T1), months (T2) years (T3) after extraction. time evolution points out rock intervals variably broken segments remain intact. Drying Alcohol Discontinuities (DAD) methodology reveals apparently intact segments. By using this technique, 4-class index established proxy for degree. When integrated geological, petrophysical geomechanical data, enables characterizing mechanisms controlling express promoting loss competence rock. Consequently, considered influence efficiency hydraulic fracture shale reservoir completion.