KnowraReservoir rockReservoir rockA porous, permeable underground rock that stores and transmits fluids such as groundwater, oil, or natural gas.BriefConnectPorosity: The fraction of a material's volume occupied by pores or open spaces. It measures how much fluid a reservoir rock can store.Darcy's law: An equation relating fluid flow through porous media to pressure gradient, permeability, and fluid viscosity. It quantifies flow through reservoir rock under a pressure difference.Aquifer: A permeable geological formation that stores and transmits groundwater. Aquifers are reservoir rocks or formations used for groundwater supply.Navajo Sandstone: A Jurassic sandstone formation exposed across parts of the southwestern United States. Its porous sandstone layers host groundwater and reveal fluid movement through rock.Caprock: A low-permeability rock layer that overlies a reservoir and restricts fluid escape. Unlike reservoir rock, it acts as a barrier that retains fluids below.Permeability: A measure of how readily fluids flow through connected pores or fractures in a material. It governs how readily fluids move through the rock.Relative permeability: A measure of how effectively each fluid flows through a porous medium when multiple fluids are present. It describes how oil, gas, and water impede one another in pores.Petroleum reservoir: A subsurface accumulation of hydrocarbons held within permeable rock beneath a sealing formation. It is the principal setting for conventional oil and gas production.Bakken Formation: A Devonian–Mississippian rock unit beneath parts of the northern United States and Canada. Its tight reservoir rocks require extensive horizontal drilling and hydraulic fracturing.Source rock: Organic-rich rock in which hydrocarbons form from buried organic matter. It generates hydrocarbons, whereas reservoir rock stores and transmits them.Show all 29Linked from 10 pagesLithologyBroader topic: Lithologic properties influence the pore space and fluid flow of reservoirs.Sequence stratigraphyRelated: Sequence architecture helps predict the distribution and connectivity of sedimentary reservoirs.Sedimentary basinRelated: Basin sandstones and carbonates may form reservoirs for petroleum or groundwater.LithificationRelated: Lithification determines the pore network that governs whether a sedimentary rock can hold fluids.PetroleumRelated: Petroleum accumulates in reservoir rock beneath an effective seal.CompactionRelated: Compaction can diminish the pore space and flow pathways that make a reservoir productive.SedimentologyRelated: Sediment texture and depositional geometry help predict reservoir quality.PetrographyRelated: Petrographic analysis reveals pore geometry, cement, and grain changes that affect reservoir quality.Show all 10