Effective porosity

About: Effective porosity is a research topic. Over the lifetime, 1199 publications have been published within this topic receiving 26511 citations.

On the field determination of effective porosity

Abstract: Effective porosity of geologic materials is a very important parameter for estimating groundwater travel time and modeling contaminant transport in hydrologic systems. Determination of a representative effective porosity for nonideal systems is a problem still challenging hydrogeologists. In this paper, some of the conventional field geophysical and hydrological methods for estimating effective porosity of geologic materials are reviewed. The limitations and uncertainties associated with each method are discussed. 30 refs., 8 figs.

Application of Kozeny-Carman Equation for the Estimation of Saturated Hydraulic Conductivity of Soils

Abstract: The generalized Kozeny-Carman equation was applied in the estimation of saturated hydraulic conductivity (Ks)from the estimated values of effective porosity of soils from six major subgroups in Kamarajar district of Tamil Nadu, India The a values of the equation for different soil subgroups varied very widely from 042 to 21 and the B values from 0004 to 1047, indicating that it cannot be universally adopted However, when profiles or each subgroup is considered separately, it is possible to have a better fit with KozenyCarman equation

Petrography and Diagenesis of the Hosston Sandstone Reservoirs at Bassfield, Jefferson Davis County, Mississippi

Abstract: Bassfield Field, discovered in 1974, is a gas accumulation in Lower Cretaceous Hosston Formation sandstone reservoirs above a deep-seated salt structure. Since 1974, it has served the Industry as an analog for later Hosston discoveries. Production at Bassfield is obtained from the Booth and Harper sandstone members of the Hosston Formation, which consist of a network of fluvial channel sandstones. The coarser-grained lower parts of the sandstone are the principal reservoirs, with porosities ranging from 8 to 16 percent and averaging 12 percent, and permeabilities ranging from 2 to 300 md and averaging 20 md. The finer-grained upper parts of the sandstones are generally tight with little or no effective porosity or permeability. Secondary quartz cement and compaction through pressure solution of grains are the principal causes of porosity reduction. Early stages of localized dolomite cementation and scattered kaolinite cementation are also instrumental to some degree in reducing porosity. A minus-cement porosity exercise suggests that oil moved into the porous lower parts of channels when they had been buried to a depth of about 6,000 feet, which may have prevented further diagenesis. The upper, tighter parts of the sandstone bodies were not invaded by oil and cementation and compaction proceeded to near completion here. Bottom-hole temperatures in the formation approach 300°F (150°C), the approximate threshold temperature of the illite zone of burial metamorphism. Scanning electron microscopy reveals the presence of small amounts of illite apparently forming from kaolinite. Such illite could seriously impair Hosston reservoirs which have undergone temperatures in excess of those at Bassfield.

Correlation between porosity and permeability of carbonate rock reservoirs

Abstract: It is critical to use proper definition of effective porosity, i.e., effective porosity as used in the USA minus the irreducible fluid saturation. Inasmuch as logs do not determine the irreducible fluid saturation, a lot of misinformation is spread around.