Porosity and permeability

A. M. S. Trabelsi andL. S. Al-Samarraie. Fiber content affects porosity, permeability, and strength of cement. OilGasJ, 97(18) 108,110,112, 114, 1999. 

Accurate interpretation of the formation properties (porosity, permeability and irreducible water saturation) requires reliable estimates of NMR fluid properties or the relationship between diffusivity and relaxation time. Estimation of oil viscosity and solution-gas content require their correlation with NMR measurable fluid properties. These include the hydrogen index, bulk fluid relaxation time and bulk fluid diffusivity [8]. 

Fig. 1. Log data showing the variation of porosity, permeability, and gas hydrate saturation for the Mallik Gas Hydrate Research Program Well-5L-38 (Uddin et al. 2008b).

Karathanasis AD, Johnson DMC, Matocha CJ (2005) Biosolid colloid mediated transport of copper zinc and lead in waste-amended soils. J Environ Qual 34 1153-1164 Kieffer B, Jove CF, Oelkers EK, Schott J (1999) An experimental study of the reactive surface area of the Fontainebleau sandstone as a function of porosity, permeability, and fluid flow rate. Geochim Cosmochim Acta 63 3525-3534... 

Tar sands are composed of a mixture of 84-88% sand and mineral-ricli clays, 4% water, and 8-12% bitumen. Bitumen is a dense, sticky, semisolid that is about 83% carbon. The substance does not flow at room temperature and is heavier than water. At higher temperatures, it flows freely and floats on water. Characteristics of tar sands important to mining, recovery, and processing indude grain size, composition, sortability, porosity, permeability, and microscopic habitat. 

Many modern scientific tools were applied to Mallik that were not available at the time of Messoyakha. For example, well logs had advanced substantially so that it was possible to determine, for example, the porosity, permeability, and hydrate saturation of the sediments at Mallik, which were not available at Messoyakha. In addition, reservoir models for hydrate production could be based upon well-constrained Mallik 2002 production data, such as pressure stimulation tests over constrained well intervals or thermal stimulation tests. 

Supercritical C02 (sc C02) is being used to accelerate the natural aging reactions (i.e., carbonation) of Portland cement. This treatment method alters the bulk properties of cement, producing profound changes in both structure and chemical composition. As a result of these changes, the mechanical and transport properties of these cements are also dramatically affected, and they display reduced porosity, permeability and pH, as well as increased density and compressive strength. 

The shaliness of a basin and the continuity of the shale layers depend on the original depositional environment (Figure 2.12). The original porosity, permeability and connectivity of the fine-grained and coarse-grained rocks are... 

Chilingar, G.V., 1964. Relationship between porosity, permeability, and grainsize distribution of sands and sandstones. In Van Straaten, L.M.J.U. (ed.) Deltaic and shallow marine deposits I. Elsevier, Amsterdam, pp. 71-75 Chilingarian, G.V., Mazzullo, S.J. and H.H. Rieke, 1992. Carbonate reservoir characterization a geologic - engineering analysis, part I, Developments in Petroleum Science 30, Elsevier, Amsterdam, 639 pp. 

A core drill provides a continuous rock core section by section. Analysis of the rock specimens can determine porosity, permeability, and capillarity, and indicate the potential productivity. 

A porous medium is simply a solid containing void spaces. Several properties of porous media that affect the flow of suspensions in these media are as follows porosity, permeability, and pore size distribution of the rock. In the following sections, a brief description of these properties is given. 

The long-term performance of the repository at Yucca Mountain will be affected by the coupling of thermal, hydrological and chemical (THC) processes in the rock around the emplacement drifts. The transport of heat, fluid, and vapor will result in changes in water and gas chemistry, as well as mineral dissolution and precipitation which may lead to permanent changes in porosity, permeability and unsaturated hydrological properties. The purpose of this contribution is to describe the approach used to model reaction-transport processes in the Drift Scale Test (DST) with comparisons of simulation results to measured geochemical data on water, gas, and minerals. 

Simulations of THC processes were performed using the TOUGHREACT code (Xu and Pruess, 2001 Xu et al 2003). TOUGHREACT is based on TOUGH2 (Pruess, 1991) and in addition to the coupling between heat, water, and vapor flow for multiphase systems, it solves aqueous and gaseous species transport, kinetic and equilibrium mineral-water reactions, and feedback of mineral precipitation/dissolution on porosity, permeability, and capillary pressure. 

Fig. 3.2. Generalized field correlations of porosity, permeability and density with depth and distribution in the Oued el-Mya and Ghadames Basins (based on statistical processing of reservoir petrophysical data)...

The compression force distribution can affect the GDL durability significantly. Severe compression may result in substrate fibers puncture into the membrane, and light compression may result in high contact resistance between the cell components and poor sealing effect. The optimized compression is a compromise between durability and performance. The compression force also changes the GDL properties under the land (e.g., porosity, permeability, and effective thermal and electron conductivities). The... 

---