Characteristics and the formation mechanism of the heterogeneous microfractures in the tight oil reservoir of Ordos Basin, China

Du, Shanshan

doi:10.1016/j.petrol.2020.107176

Cited by 22 publications

(7 citation statements)

References 31 publications

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“…Therefore, it is reasonable to assume that the overall concavity of the pore should be high in the reservoir with strong compaction. The average degrees of concave and convex pores can be used as indicative parameters of reservoir compaction [27,29].…”

Section: The Average Pore-throat Soliditymentioning

confidence: 99%

“…With respect to the new parameter, the "S" and "Sc" in equation ( 2) would be the pore area and the area of the convex hull of the pore boundary, respectively. Therefore, the smaller the pore-throat solidity, the higher the degree of compaction [27,29].…”

Section: The Average Pore-throat Soliditymentioning

confidence: 99%

“…Fluid particles flow through the medium in unit distancedthe actual length of the motion trajectory of the particle. This is an important parameter for evaluation of the complexity of the seepage channel, and also one of the most important in the prediction of reservoir permeability [27].…”

Section: The Average Pore-throat Tortuositymentioning

confidence: 99%

“…In fact, the author has mentioned the practical application of the relevant fracture or pore geometric parameters in some other occasions, but this does not mean that the special significance of these geometric parameters in the study of "Umbrella Deconstruction" has been solved thoroughly. Therefore, we still need to explore furtherly [27].…”

Section: Introductionmentioning

confidence: 99%

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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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Section: The Average Pore-throat Soliditymentioning

confidence: 99%

Section: The Average Pore-throat Soliditymentioning

confidence: 99%

Section: The Average Pore-throat Tortuositymentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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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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“…Energy sources around the world have been changing from solid (firewood and coals) and liquid (petroleum) states to gas state (natural gas) [1], where tight sandstone reservoirs have been playing an important role and exploited industrially in many countries as an effective storage of natural gas, which is a complicated porous material with a highly heterogeneous nanopore structure [2][3][4][5][6][7][8]. Owing to the complexity of the its pore-throat system, pore structure and its fractal characteristics analysis become the core work of reservoir quality evaluation, which includes the research content of specific surface area (SSA), pore volume (PV), pore size distribution (PSD), pore morphology, and anisotropy [9][10][11].…”

Section: Introductionmentioning

confidence: 99%

Nano-Scale Pore Structure and Its Multi-Fractal Characteristics of Tight Sandstone by N2 Adsorption/Desorption Analyses: A Case Study of Shihezi Formation from the Sulige Gas Filed, Ordos Basin, China

et al. 2020

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Fractal dimension is a critical parameter to evaluate the heterogeneity of complex pore structure in tight sandstone gas and other low permeability reservoirs. To quantify the fractal dimension of tight sandstone at various pore size classes and evaluate their implications on mineral composition and nano pore structure parameters, we conducted an integrated approach of N2 adsorption/desorption experiment (N2-GA), X-ray diffraction (X-RD), and field emission scanning electron microscopy (FE-SEM) on Sulige tight sandstone reservoirs. By comparing the nine types of fractal dimensions calculated from N2 adsorption data, we put forward the concept of “concentrated” fractal dimensions and “scattered” fractal dimensions (DN2, DN3, DN5, DN7 and DN8) for the first time according to its concentration extent of distribute in different samples. Result shows that mineral composition has a significant influence of a different level on specific surface area (SSA), pore volume (PV), and fractal dimensions (DN), respectively, where the “scattered” fractal dimension is more sensitive to certain specific property of the reservoir, including mineral content and the specific surface area contribution rate (Sr) of type II mesopores (Mesopore-II: 10~50nm). In addition, three type of hysteresis loops were distinguished corresponding to different pore shape combination of N2-GA isotherm curve, which reveals that pore structure heterogeneity is mainly controlled by inkbottle-shaped pores and the volume contribution rate (Vr) of mesopores in this study area. These findings could contribute to a better understanding of the controlling effect of pore heterogeneity on natural gas storage and adsorption.

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A Novel Method for Predicting Productivity of the Multi-stage Fractured Horizontal Well with Tighter Clusters in the Heterogeneous Tight Oil Reservoir and Its Applications

Jiang¹,

Lin²,

Zhao³

et al. 2022

Proceedings of the International Field Exploration and Development Conference 2021

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Characteristics and the formation mechanism of the heterogeneous microfractures in the tight oil reservoir of Ordos Basin, China

Cited by 22 publications

References 31 publications

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

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

Nano-Scale Pore Structure and Its Multi-Fractal Characteristics of Tight Sandstone by N2 Adsorption/Desorption Analyses: A Case Study of Shihezi Formation from the Sulige Gas Filed, Ordos Basin, China

A Novel Method for Predicting Productivity of the Multi-stage Fractured Horizontal Well with Tighter Clusters in the Heterogeneous Tight Oil Reservoir and Its Applications

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