Topic
Effective porosity
About: Effective porosity is a research topic. Over the lifetime, 1199 publications have been published within this topic receiving 26511 citations.
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01 Dec 2010
TL;DR: In this article, a study on the porosity of cores from Resende Basin (Rio de Janeiro) is presented, where the results of porosity from the core were correlated with data from the corrected effective porosity (gamma ray profile) in order to prove the results obtained with both methods.
Abstract: This work presents here a study on the porosity of cores from Resende Basin (Rio de Janeiro). The first step involved the selection, thinning of the material (core) and sample preparation for the use of porosimeter to obtain effective porosity. The material studied is sandstone, friable, coarse to very fine of three wells (GPR1, GPR2 and GPR3). The fuzzy logic (MatLab) was applied to the effective porosity data calculated from the gamma ray (GR) profile for the construction of a synthetic profile and from this we could identify the errors made in calculating the data. Then the results of porosity from the core were correlated with data from the corrected effective porosity (gamma ray profile) in order to prove the results obtained with both methods. The analysis of the synthetic porosity calculated by the fuzzy logic has shown that this is a promising method for assessing the quality of data and to obtain good fits.
1 citations
TL;DR: In this paper , the average values of gross thickness, volume of shale, effective porosity, total porosity and permeability, water saturation and hydrocarbon saturation of the delineated reservoir sand are 200.5ft for gross thickness and 18% for shale volume.
Abstract: Reservoir characterization of W-field, onshore Niger Delta was carried out using petrophysical evaluation of well logs. Three reservoir sand intervals (A, B, C) were identified and correlated across four wells (W1, W2, W3, W4) in W-field using the gamma ray, while the fluid identification of each reservoir was achieved using the resistivity log. The reservoir C interval was selected and utilized for petrophysical interpretation was penetrated at depths 11741-11945ft, 11933-12173ft, 11658-11847ft and 11926-12095ft across all wells respectively.The average values of gross thickness, volume of shale, effective porosity, total porosity, permeability, water saturation and hydrocarbon saturation of the delineated reservoir sand are 200.5ft for gross thickness, 18% for shale volume, 21% for effective porosity, 26% for total porosity, 1071.74mD for permeability, and 28% for water saturation and 77% for hydrocarbon saturation. Petrophysical evaluation revealed that porosity and permeability are very good to excellent in the field. The reservoir is classed as clean sands based on the high net to gross ratio (>70%) and the low shale volumes (<30%). Consequently, the low value of shale volume, low value water saturation, high value of hydrocarbon saturation and the good porosity and permeability properties of the reservoir of interest suggest economical and commercial quality and viability of the wells within this field.
1 citations
Journal Article•
TL;DR: In this paper, the estimated evaporation and surface run-off have been used to calculate the effective porosity of laterite and effective fissure porosity, which ranges between 0.50 to 6.04 per cent and from 0.94 to 1.67 per cent respectively.
Abstract: The estimated evaporation and surface run-off have been used to calculate the effective porosity of laterite and effective fissure porosity of weathered basalt which ranges between 0.50 to 6.04 per cent and from 0.94 to 1.67 per cent respectively.
1 citations
Journal Article•
TL;DR: In this paper, the influence of the late-diagenetic on reservoir porosity was discussed according to the sedimentary particle size analysis and scanning electron microscopy observation, and the conclusion that the chief destructions of reservoir-quality which is in the transform sequence of "Montmorillonite-Andreattite-Illite " are the cementation and the evolution of clay cementation.
Abstract: The typical low permeability lithological reservoir is the main reservoir which has been developed from Shan-2 member to He-8 member at the upper Paleozoic in Northern Shaanxi slope,Ordos Basin. The reservoir properties dominate the enrichment of oils and gas. The merits of tight reservoir porosity are associated with their sedimentary and diagenetic environment. In this paper,the influence of the late-diagenetic on reservoir porosity was discussed according to the sedimentary particle size analysis and scanning electron microscopy observation. From the result of this study,we can draw the conclusion that the chief destructions of reservoir-quality which is in the transform sequence of "Montmorillonite-Andreattite-Illite " are the cementation and the evolution of clay cementation. Furthermore,the clay membrane of chlorite which is developed in the surface of clastic particles can protect the reservoir porosity from the late-cementation while block the primary porosity. Therefore the clay membrane of chlorite can be one of the criteria to judge the reservoirquality in gas reservoir exploration.
1 citations