Curvature of the strata.
This video shows how the drill traverses from the anticlinal type fold through the hinge area. It clearly shows the curvature of the strata on both flanks of the fold. In general, an anticlinal type fold stems from tectonic forces of various kinds, such as: tangential pressure, sliding or shifting, intrusion or ejection of material from deeper areas or vertical deformation of the substrate. In this case, it is due to the compressing resultant of tangential stresses.
Vertical fault, crossed by a drilling
This video shows the presence of a lithologic change associated to a subvertical fault crossed by the drilling. A vertical fault is caused by a material adjustment when tectonic forces exceed the strength of the rocks. The rupture zone may have a well defined area, called the fault plane and its formation is accompanied by a landslide of rocks tangential to this plane, which is what you see in the video as a discoloration of the rock.
Discoloration on the rock
It may be observed a change in the color of the rock associated with a lithologic change. In seudohorizontal character of the strata in that area, the change is caused with drilling depth. A variation in the conditions of sedimentation of materials and / or during the processes of lithification and diagenesis, it results in the heterogeneous nature of subsurface materials.
Fracture and brecciated rock
The video displays a vertical fracture in the rock, in which it can be appreciated the breccia fault in the left of the image and sound rock to the right, locating in the middle the fracture itself. This is due to the tectonic efforts that cause the breakdown of the materials when tectonic forces exceed the strength of the rocks. The rupture zone, rather than a net area is more heterogeneous and diffuse, due to the breakage and fragmentation of the rock near the slip plane, which is called fault zone, which results to the breccia fault (mylonite rock).
Fractures associated to drilling.
It can be observed an open fracture, with associated karst phenomenon. These fractures are responsible for the hydraulic performance of the drilling test, due to, through them is circulating most of the well's water flow in carbonate aquifers. In turn, the circulating water action creates karst phenomenon, dissolution-precipitation of minerals from existing carbonated rocks, in the case of carbonate aquifers, as in this case.