Influência da geometria das fraturas na conectividade dos aquíferos fissurais

Abstract

The geology of the Brazilian Northeast Region is marked by crystalline bedrock. Aquifers found in this kind of formation are characterized by discontinuous forms of storativity. In them, water is stored and flows through fractures present in the rock. However, in order to exist flow it must exist physical joints among fractures. If those connections exist, fractures act as conduits which transport water from reservoir to wells drilled in the formation. In this paper it was used a fractured media groundwater flow model to find out which factors mainly influence the existence of the connections ando f the transmissivity. Results indicated that fracture’s frequency, length, and orientation do influence the medium connectivity. Systems holding great frequency exhibit better connectivity than those with few fractures. Systems that have long fractures are better connected than those that have short fractures and systems that have a great standard deviation in their orientation show better connectivity than those that have parallel fractures. It was found that systems with greater openness have better transmissivity.