A new and more precise experiment method for characterizing the mineralogical heterogeneity of unconventional hydrocarbon reservoirs

Du, Shanshan; Pang, Shan; Shi, Yongmin

doi:10.1016/j.fuel.2018.06.012

Cited by 21 publications

(11 citation statements)

References 20 publications

(15 reference statements)

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“…It is a large multicycle craton basin with the occurrence of whole lift and depression migration, and the structure inside the basin is relatively simple. Abundant oil resources existed in the Upper Triassic the ultra-low permeability Yanchang Formation, which is part of a lake-delta sedimentary system (Du et al, 2018a and2018b).…”

Section: Geologic Settingmentioning

confidence: 99%

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Prediction of permeability and its anisotropy of tight oil reservoir via precise pore-throat tortuosity characterization and “umbrella deconstruction” method

2019

Journal of Petroleum Science and Engineering

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A B S T R A C TThis study aimed to investigate the prediction method of permeability and its anisotropy of tight oil reservoir via precise pore-throat tortuosity characterization and "umbrella deconstruction" method combining the approaches of the field emission SEM imaging, high resolution image processing, fine and large-scale mathematical statistics, nonlinear regression and other technical means.In this paper, the authors proposed the new calculation model of pore-throat tortuosity, the absolute permeability and the permeability anisotropy based on the improved deep understanding of reservoir. Results of the prediction on the tight oil reservoir of "YANCHANG" formation in Ordos Basin show that the errors of the new method in this paper are the smallest among the total five methods, respectively 0.023 × 10 −3 μm 2 and 0.090 × 10 −3 μm 2 ; the average values of other four methods were 0.090 × 10 −3 μm 2 and 0.108 × 10 −3 μm 2 , respectively. The predicted results have higher accordance with the measured results, which proved the practicality of the new method. The samples has the highest permeability at the angle of 0°(180°/360°) and the permeability values are equal to 0.25 × 10 −3 μm 2 . Similarly, the sample has the lowest permeability at the angle of 22.5°(202.5°), 90°(270°), and 112.5°(292.5°), the permeability values are all equal to 0.06 × 10 −3 μm 2 . At the same time, the calculation of permeability anisotropy results shows that the anisotropy of tight oil reservoirs is very significant, and the permeability value in one direction is obviously higher than which in other directions.It is concluded that the precise description of pore throat geometry, especially the calculation of pore-throat tortuosity parameter, is one of the most important parameters affecting the prediction accuracy of permeability theoretically. Meanwhile, there are dominant seepage channels, which would play a very important guiding role in the prediction of hydrocarbon accumulation and seepage capacity.The conclusion will provide a more rigorous theoretical basis for the rapid and accurate evaluation of the physical properties of unconventional reservoirs. distortion of surface roughness into pore throat resulted in the underestimation of permeability. Arash et al. (2016) estimated three-dimensional coordination numbers from two-dimensional cross-sectional images and explored the error of absolute permeability prediction using pore network flow model. An et al. (2016) studied the effects of pore throat ratio, coordination number and pore throat orientation on absolute permeability using a regular network model. Shah et al. (2016) predicted the properties of pore network, such as the number of pore and throat, average pore throat radius and coordination number, and used Lattice Boltzmann (LBM) or pore network (PNM) modeling to simulate single-phase and dual-phase flow. Three-dimensional core image can be obtained after CT scanning, and digital core can be built after filtering and segmentation. Yang et al. (2016) gets the rock

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Section: Geologic Settingmentioning

confidence: 99%

“…Comprehensive technical process of the permeability prediction and its anisotropy in tight oil reservoir of yanchang formation in ordos basin via "umbrella deconstruction" method and precise pore geometry characterization. (Modified fromDu et al, 2018a and2018b).…”

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confidence: 99%

Prediction of permeability and its anisotropy of tight oil reservoir via precise pore-throat tortuosity characterization and “umbrella deconstruction” method

2019

Journal of Petroleum Science and Engineering

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“…At almost the same time point, based on the research of Du et al [22], Du et al [23] broadened the application scope of "Umbrella Deconstruction" for the first time. A kind of mineral named "calcite" with special geological and engineering significance is identified by combining the point measurement of Energy Dispersive Spectrometer (EDS).…”

Section: Introductionmentioning

confidence: 99%

“…By drawing the calcite property curve of reservoir slices in eight directions, the potential and dominant direction of formation of pressure fracture can be well understood. Du et al [23] is the first extension of "Umbrella Deconstruction" technology.…”

Section: Introductionmentioning

confidence: 99%

Profound connotations of parameters on the geometric anisotropy of pores in which oil store and flow: A new detailed case study which aimed to dissect, conclude and improve the theoretical meaning and practicability of “Umbrella Deconstruction” method furtherly

2020

Energy

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Umbrella Deconstruction" method has already been raised in a set of published papers accomplished by the author of this study and his collaborators. This method aimed to unlock the "black box" of the anisotropic pores, elements and minerals of reservoirs from a new perspective. Compared with all the previous case studies, the purpose of this study is to investigate the profound connotations and special significance of the geometric parameters describing the pores in the study of "Umbrella Deconstruction" method furtherly.This new case study shows the extreme points of reservoir properties could be the turning points of some complex geological processes. It also shows that there are two possible mechanisms which would control the geometry of the pore boundary, including "the differential corrosion due to compaction process" and "the seepage process controlled by dominant channels". The location of the maximum and minimum values of eight sections and the angle between the maximum and minimum values had significance in the geologic mechanism and development processes.The conclusions suggest that, when we carry out the study of micro-anisotropy characterization, we should investigate what relative quantitative enlightenment can be brought to us by the change characteristics and laws of pore geometry parameters from both the geological and engineering perspectives. This will contribute to the further explanation and improvement of the practicability of "Umbrella Deconstruction" in pore characterization.

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“…Moreover, compaction, deposition, and modification performances have primarily affected by the characterization of pore throats (Du et al, 2018a(Du et al, , 2019. A new experimental investigation which is named umbrella deconstruction has been used to measure the pore heterogeneity in microscopic scale for unconventional hydrocarbon reservoirs.…”

Section: Introductionmentioning

confidence: 99%

A parametric study to numerically analyze the formation damage effect

Davarpanah

Mirshekari

Razmjoo

2019

Energy Exploration & Exploitation

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Spontaneous countercurrent imbibition is one of the essential parameters in the study of formation damage effect in hydrocarbon reservoirs when the drilling fluid is contacted with the drilled formation. Formation damage is considered as one of the harmful phenomena which would seriously affect the efficiency of drilling performances. In this paper, a numerical model was proposed to analyze the main parameters which have profoundly impacted the formation damage. Based on the following parameters of porosity, permeability, water saturation, oil viscosity, pressure drop, contact time, and capillary pressure which were performed in the proposed model, the dominant influence of each parameter was evaluated in more detail. Regarding the high expenditures of scanning electron microscopy and CT scan in petroleum industries, the proposed analytical model would be beneficial instead of spending vast expenditures of experimental evaluation. Subsequently, to provide the accuracy of the model, a set of experimental CT scan data were used to validate the proposed model, and according to the results of this study, it is evident that the proposed model results are in a good agreement with the laboratory data.

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A new and more precise experiment method for characterizing the mineralogical heterogeneity of unconventional hydrocarbon reservoirs

Cited by 21 publications

References 20 publications

Prediction of permeability and its anisotropy of tight oil reservoir via precise pore-throat tortuosity characterization and “umbrella deconstruction” method

Prediction of permeability and its anisotropy of tight oil reservoir via precise pore-throat tortuosity characterization and “umbrella deconstruction” method

Profound connotations of parameters on the geometric anisotropy of pores in which oil store and flow: A new detailed case study which aimed to dissect, conclude and improve the theoretical meaning and practicability of “Umbrella Deconstruction” method furtherly

A parametric study to numerically analyze the formation damage effect

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