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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TL;DR: In this paper, the relationship between velocity and effective porosity with the effects of the clay minerals was discussed and the area of the data was determined by two equations: one equation expressed the relation between the velocity and porosity for clean sandstone and another expression expressed the relations between the velocities of 100% clay minerals in the pore space.
Abstract: In this paper, we discussed the relationship between velocity and effective porosity with the effects of the clay minerals. The relation between velocity and porosity is shown on the crossplot (Fig. 1); the velocity generally increases as the porosity decreases but the data are so dispersed that we are not able to come up with an equation that exhibits strong linear relation between velocity and porosity. We supposed that the existence of clay is the cause of this dispersion. We determined the area of the data by two equations: one equation expresses the relation between the velocity and porosity for clean sandstone and another expresses the relation between the velocity and effective porosity of 100% clay minerals in the pore space. The effective porosity is moved between two lines.Using the technique of well log interpretation, we estimate the volume of bound water and show the effects of clay minerals for the relationship between velocity and effective porosity.The velocities of shale show the effects of velocity reduction due to clay minerals.
1 citations
15 Nov 2015
TL;DR: In this paper, three porosity models (total porosity, effective porosity and a movable fluid model) are compared from a simulator to seismic (sim2seis) modeling perspective.
Abstract: In this study, porosity concepts in Gassmann’s fluid substitution model are examined and their implications for quantitative 4D seismic studies are discussed. Three porosity models (total porosity, effective porosity, and a movable fluid model) are compared from a simulator to seismic (sim2seis) modelling perspective. From the three selected models, total porosity predicts the largest softening effect due to gas breakout and the smallest hardening effect from water-flooding; whereas the movable fluid model predicts the least softening due to gas breakout and the largest effects for water-flooding. Effective porosity predictions lie between the total porosity and movable fluid models. The differences between these models are due to the proportion of fluids in the mixture which are input into Gassmann’s equations. Sim2seis results based on different porosity models were evaluated against the observed 4D seismic. This comparison shows that the magnitude of the saturation-induced hardening and softening signals due to the movable fluid model is closer to the observed seismic. The total porosity model is in least agreement with the observed 4D seismic.
1 citations
23 May 2011
TL;DR: In this paper, the authors used the Burdine and Brooks-Corey model as the most common approximations of the relative permeability curves and proposed a new analytical approximation based on log data with high reliability.
Abstract: Proposed paper is devoted to the investigation of the relative permeability model and algorithm for relative permeability determination with log suite data. In practice it is used Burdine and Brooks-Corey model as the most common approximations of relative permeability curves. But these models describe laboratory core measurements data poor in the low relative permeability area. We obtained new analytical approximations for more detailed and accurate description of relative permeability curves and describe more than 160 core samples of Western Siberia Jurassic reservoirs (shaly sandstones) with it. Description results show that proposed model has better accuracy in comparison with known analogues. The curvature parameter of the new approximation has strong correlation with reservoir properties (effective porosity and dynamic porosity). This fact makes possible to predict relative permeability according to log data with high reliability. Relative permeability calculated according to log data can be used for prediction of the brine share in production volume with Leverett function and, as a consequence, has great practical importance for field development design.
1 citations
Journal Article•
TL;DR: In this article, the authors used conventional logging data to evaluate the secondary porosity in the Budate Group Reservoir in Beier Depression of Hailarer Basin, whose lithology is more complex and belongs to dual-porosity reservoir.
Abstract: Budate Group Reservoir in Beier Depression of Hailarer Basin is buried hill oil reservoir,whose lithology is more complex and belongs to dual-porosity reservoir. It is difficult to use conventional logging data to evaluate the reservoir.Therefore,conventional well logging data,combine imaging logging data, with advanced PoroSpect analysis technique,etc.are used to evaluate the development of the secondary porosity in the reservoir quantitatively,realizing quantitatively reservoir effective porosity calculation.It provides new measures for evaluating dual-porosity reservoir logging in buried hill reservoirs,and has a guiding effect for well logging evaluation in other fractural oil and gas reservoirs.
1 citations