Anisotropy characteristics of element composition in Upper Triassic “Chang 8” shale in Jiyuan district of Ordos Basin, China: Microscopic evidence for the existence of predominant fracture zone

Du, Shanshan; Xu, Feng; Abitkazy, Taskyn; Zhou, Bo; Kou, Gen; Shi, Yongmin

doi:10.1016/j.fuel.2019.05.031

Cited by 11 publications

(5 citation statements)

References 20 publications

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“…At the same time, Du et al [25] also selects samples from adjacent areas for supplementary verification. This is undoubtedly a special progress compared with [9] and Du et al [23].…”

Section: Introductionmentioning

confidence: 80%

“…With the popularity of unconventional oil and gas reservoir research, the direction of scholars' efforts mostly lies in how to see the smaller and smaller pores. This will undoubtedly make us ignore the significance of taking into account both sample size (Scale) and resolution (Rev) for pore heterogeneity quantification in reservoirs [9,10].…”

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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“…At the same time, Du et al [25] also selects samples from adjacent areas for supplementary verification. This is undoubtedly a special progress compared with [9] and Du et al [23].…”

Section: Introductionmentioning

confidence: 80%

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

Self Cite

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“…For instance, despite its higher permeability, the low pore connectivity obtained from Ilaro-5 is due to its less complicated inorganic pore network compared to the convoluted nature in other samples characterized by higher effective tortuosity. Shale permeability is influenced by an anisotropic connected pore throat distribution and tortuosity. , …”

Section: Discussionmentioning

confidence: 99%

Pore Structure and Seal Capacity of Ilaro Formation Shales in the Eastern Dahomey Basin: Implications from Mercury Injection Capillary Pressure and Spontaneous Imbibition Analyses

Ukaomah

Zhang

et al. 2021

Energy Fuels

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A petrophysical evaluation of caprock pore characteristics and seal capacity is critical for geologic storage of CO 2 . In this study, integration of X-ray diffraction, mercury injection capillary pressure (MICP), and spontaneous imbibition analyses is used to evaluate the pore characteristics and seal capacity of shale samples from the Ilaro formation, which could serve as a seal for CO 2 injected into the reservoir units of the eastern Dahomey basin. X-ray diffraction reveals the samples as clay-rich and early diagenetic, while spontaneous imbibition reveals pore connectivity heterogeneity. MICP analysis shows the samples as being characterized by a low breakthrough pressure and reveals the mesopore dominance with majority of pore volumes dominated by 5 to 10 nmsized pore throats. Furthermore, high CO 2 column heights are obtained from conversion of MICP data (at 20% saturation) for mesopore-dominated samples containing ankerite and kaolinite. The study reveals that should injected CO 2 migrate upward from the reservoir units of the onshore eastern Dahomey basin, portions of the Ilaro formation may function as a good seal due to the mesopore mineralogical composition influence on the CO 2 −brine−rock interaction. This result should therefore serve as an important insight for future caprock sealing studies conducted on the onshore eastern Dahomey basin.

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“…In particular, the Chang 8 1 formation is the main formation. The macroscopic research aspects include sequence stratigraphic analysis [2], sedimentary characteristics research [3], sandbody structure genesis research [4,5], and fault zone development and distribution characteristics research [6]. The microscopic research aspects include the influence of diagenesis and densification upon accumulation [7][8][9][10], quantitative evaluation of the microscopic pore structure origin [11][12][13], and research on the characteristics of movable fluid and water flooding [14,15].…”

Section: Introductionmentioning

confidence: 99%

Study on the Genetic Differences in Reservoir Characteristics Based on the Bidirectional Provenance of the Yanchang Formation in the Jiyuan Area, Ordos Basin, China

et al. 2022

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Ordos Basin is a Mesozoic sedimentary basin that underwent long-term evolution on the North China Craton. Many scholars have confirmed that in the Late Triassic, the basin was surrounded by ancient continents, and there were multiple provenance supply directions. Combined with the nature of the basement of the basin and the characteristics of the present structure, it is believed that the Jiyuan area is located in the central and western parts of the basin, spanning two first-level structural units, the Tianhuan Depression and the Yishan Ramp. This special geographical location makes Jiyuan area affected by bidirectional provenance. Controlled by the northwest and northeast depositional systems in the basin, Jiyuan area has accepted complex sedimentation and diagenesis, forming a low-porosity ultralow-permeability reservoir. However, the understanding of bidirectional provenance has been neglected in many previous studies on reservoir characteristics in the Jiyuan area. Therefore, the differential evolution of sedimentation and diagenesis caused by bidirectional provenance will cause serious deviations in the original understanding of reservoir characteristics in the Jiyuan area, which will inevitably affect subsequent exploration and development research work. In this paper, the mineral composition, physical properties, diagenesis, and diagenetic evolution of the Jiyuan area are studied by combining a large number of tests such as core physical properties, casting thin sections, scanning electron microscopy, cathodoluminescence, and X-ray diffraction. Then, the origins of reservoir development in two areas dominated by bidirectional provenance are analyzed and compared. Furthermore, the diagenetic facies are characterized by a cluster analysis of logging data, and finally, the reasons for the differences in reservoir distribution and the genetic mechanism between the Yinshan provenance area (YPA) and Alxa provenance area (APA) are obtained. The results show that, first, due to the different provenance, compared with the YPA, the reservoir pore space in the APA is better developed and the physical properties are better. Second, the clay mineral content and diagenesis are more important causes of reservoir differentiation, and the reservoir pores in the YPA are more affected by kaolinite and chlorite filling than those in the APA. Although more dissolution improvements have been obtained, the damage to the reservoir caused by cementation in the middle and late stages is extremely fatal, while the chlorite film in the APA reservoir has a better protection effect on the primary intergranular pores. Third, after the evolution of pores in the APA reservoir, more intergranular pores are preserved, and the distribution range of high-quality diagenetic facies is wider than that in the YPA. Finally, sedimentation is the basis for high-quality reservoir development, and good mineral content composition and favorable diagenetic transformation cause reservoir dissimilarity.

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Anisotropy characteristics of element composition in Upper Triassic “Chang 8” shale in Jiyuan district of Ordos Basin, China: Microscopic evidence for the existence of predominant fracture zone

Cited by 11 publications

References 20 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

Pore Structure and Seal Capacity of Ilaro Formation Shales in the Eastern Dahomey Basin: Implications from Mercury Injection Capillary Pressure and Spontaneous Imbibition Analyses

Study on the Genetic Differences in Reservoir Characteristics Based on the Bidirectional Provenance of the Yanchang Formation in the Jiyuan Area, Ordos Basin, China

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