Investigation on the pore structure and multifractal characteristics of tight oil reservoirs using NMR measurements: Permian Lucaogou Formation in Jimusaer Sag, Junggar Basin
TL;DR: In this article, the pore structure and heterogeneity of the unconventional tight oil reservoirs of the Permian Lucaogou Formation of Jimusaer Sag, Junggar Basin are not studied well.
About: This article is published in Marine and Petroleum Geology.The article was published on 2017-09-01. It has received 202 citations till now.
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TL;DR: In this paper, the pore size distribution and 3D pore connectivity are evaluated from NMR and XCT analysis, and the NMR spectrum is also linked to the macroscopic performance, and pore network is determined from N 2 GA, and fractal theory is introduced to explain the irregularity and heterogeneity of pore throat structure characteristics.
410 citations
TL;DR: In this paper, the pore structures of unconventional reservoirs such as shale can assist in estimating their elastic transport and storage properties, thus enhancing the hydrocarbon recovery from such massive resources, and the results showed that all range of pore sizes: micro ( 50nm) exist in the Bakken shale samples.
196 citations
TL;DR: In this paper, the authors studied the properties of the pore space of low-permeability porous media and compared the results obtained from three different methods: scanning electron microscopy, MICP, and X-ray computed tomography (X-ray CT).
152 citations
TL;DR: In this article, the pore structure was comprehensively evaluated and characterized by linking NMR T2 spectrum with high pressure mercury intrusion (HPMI) analysis, and three typical types of pore structures were recognized through thin section, SEM analysis combined with the capillary curve and NMRT2 spectrum, and the microscopic and macroscopic characteristics of the three pore shapes were investigated.
126 citations
TL;DR: In this article, the effect of stress on the heterogeneity of pore-fracture system has a two-stage characteristic, at the initial stage that the confine pressure is less than 9 MPa, the pore and fracture heterogeneity tends to become more complex.
89 citations
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TL;DR: A description of normalized distributions (measures) lying upon possibly fractal sets; for example those arising in dynamical systems theory, focusing upon the scaling properties of such measures, which are characterized by two indices: \ensuremath{\alpha}, which determines the strength of their singularities; and f, which describes how densely they are distributed.
Abstract: We propose a description of normalized distributions (measures) lying upon possibly fractal sets; for example those arising in dynamical systems theory. We focus upon the scaling properties of such measures, by considering their singularities, which are characterized by two indices: \ensuremath{\alpha}, which determines the strength of their singularities; and f, which describes how densely they are distributed. The spectrum of singularities is described by giving the possible range of \ensuremath{\alpha} values and the function f(\ensuremath{\alpha}). We apply this formalism to the ${2}^{\ensuremath{\infty}}$ cycle of period doubling, to the devil's staircase of mode locking, and to trajectories on 2-tori with golden-mean winding numbers. In all cases the new formalism allows an introduction of smooth functions to characterize the measures. We believe that this formalism is readily applicable to experiments and should result in new tests of global universality.
2,696 citations
2,510 citations
01 Jan 2012
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1,081 citations
TL;DR: In this article, a simple method for computing f(ensuremath{\alpha}) based on the theorems of Shannon, Eggelston, and Billingsley is presented. But this method is not suitable for low-dimensional chaotic systems where the underlying dynamics are unknown.
Abstract: The direct determination of the f(\ensuremath{\alpha}) singularity spectrum from experimental data is a difficult problem. This Letter introduces a simple method for computing f(\ensuremath{\alpha}) based on the theorems of Shannon, Eggelston, and Billingsley which is markedly superior to other recently proposed methods, especially when dealing with experimental data from low-dimensional chaotic systems where the underlying dynamics are unknown.
887 citations
TL;DR: In this article, a new, practical and theoretically correct methodology is proposed for identi$cation and characterization of hydraulic units based on a modified Kozeny-Carmen equation and the concept of mean hydraulic raditis.
Abstract: Understanding complex variations in pare geomet~ within different Iithofacies is the key to improved reservoir description and exploitation. Core data provide in~ornration on various depositional and diagenetic controls on pore geometry. Variations in pore geometrical attributes in rum, de$ne the existenceof distinct zones(hydraulic units) with similar f?uid-jlow characteristics. Classic discrimination of mck types has been based on subjective geological observations and on empirical relationships between the log of permeability versus porosity. Howevec for any porosity within a given mck type,permeability can vary by several orders of nragnitnde, which indicates the existenceof severalflow units. In this papec a new, practical and theoretically correct methodology is proposedfor identi$cation and characterization of hydraulic units widtin mappable geological units (facies). The technique is based on a modified Kozeny-Carmen equation and the conceptof mean hydraulic raditis. The equation indicatesIhat for any hydraulic unit, a log-log p!ot of a “Reservoir Quality index,” (RQI), which is equal to 0.0314 ~. versus a “Normalized PorosityIndex” (+=) which is equal to WI-W should yield a straight line with a unit slope. 7he intercept of the unit slope line with +Z = 1, designated as the “FIow Zme Indicator” (M), is a unique parameter for each hydraulic unit. RQI, 4, and FZI are based on stressed potvsity and permeability data measuredon core samples.
878 citations