Quantitative fracture evaluation method based on core-image logging: A case study of Cretaceous Bashijiqike Formation in ks2 well area, Kuqa depression, Tarim Basin, NW China

Hu, Qin; Zhang, Fuxiang; Wang, Zhenyu; Yang, Xiawei; Liu, Hongtao; Dan, Ba; Xi, Wang

doi:10.1016/s1876-3804(16)30054-4

Cited by 31 publications

(2 citation statements)

References 5 publications

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“…The effectiveness of fractures is a direct indicator of the reservoir's performance. Two main criteria are used to evaluate the effectiveness of fractured reservoirs: firstly, the degree of fracture development [18,19], which encompasses the number, scale and distribution of fractures. The existence of fractures greatly improves the permeability of the reservoir and increases the storage space.…”

Section: Construction Of Fracture Effectiveness Indexmentioning

confidence: 99%

A New Approach of Well Productivity Evaluation for Fractured Buried Hill Gas Reservoirs Based on Imaging Logging Data

Bi,

Chen

2023

Applied Sciences

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Fractures function as storage spaces and effective seepage channels for metamorphic rock buried hill reservoirs. Their effectiveness and permeability govern the content and enrichment of oil and gas. Owing to the convoluted distribution patterns of fractures, it is arduous to gauge the effectiveness and permeability of fractures with precision, thus rendering well productivity prediction difficult. This article cites fractured gas reservoirs in a metamorphic rock buried hill as an example. Through comprehensive usage of core and imaging logging data to finely interpret fractures, calculate the fracture parameters that control productivity, including fracture density, fracture width, and fracture porosity. According to the evaluation index of fracture effectiveness, the method of constructing effectiveness index is proposed to quantitatively evaluate the effectiveness. Combined with the study of the law of influence of fracture parameters on reservoir permeability, the permeability index is established to reflect permeability. Productivity coefficients for fractured reservoirs with pollution factors have been established by using well-test interpretation data. To evaluate the well productivity of buried hill reservoirs, a productivity assessment chart is constructed by integrating the fracture effectiveness index, permeability index, and productivity coefficient. This chart enables prompt predictions of the buried hill reservoir’s productivity. In order to verify the reliability of the method, a comprehensive comparison is made through conventional, array acoustic logging data and test data. The results show that the method is well applied in the evaluation of metamorphic rock buried hill reservoirs and provides a new idea for the rapid prediction of well productivity.

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Section: Construction Of Fracture Effectiveness Indexmentioning

confidence: 99%

A New Approach of Well Productivity Evaluation for Fractured Buried Hill Gas Reservoirs Based on Imaging Logging Data

Bi,

Chen

2023

Applied Sciences

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“…In this study, we aim to take the Lower Cretaceous Kuqa Depression tight sandstones as an example to depict natural fractures in macro-and microscopic views and further understand their distribution patterns in tight sandstones at depths more than 6500 m. The studied formation was classified as typical tight sandstones with matrix permeability varying between 0.01 mD and 0.1 mD (Zhang et al 2014), and natural fractures have dominated flow of natural gas within the formation (Zhang et al 2011;Yang et al 2013;Qu et al 2016;Liu et al 2017). Previously, considerable studies have concentrated on macrofracture observation in outcrops and cores and suggested that these fractures were formed during the strata bending, and outcrop surveys reveal that at least one pair of conjugate shear fractures with high dip-angles could be the main fracture pattern in the tight sandstones (Zhang et al 2012;Sun et al 2015;Liu et al 2016;; microfractures were barely mentioned except they have been noticed recently with the help of microscopic techniques (Liu et al 2017).…”

Section: Introductionmentioning

confidence: 99%

Natural fractures at depth in the Lower Cretaceous Kuqa Depression tight sandstones: identification and characteristics

Nian

Li²,

Hou³

et al. 2020

Geol. Mag.

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The Kuqa Depression in the northern Tarim Basin, NW China, is characterized by fault-controlled anticlines where natural fractures may influence production. Natural fractures in the Lower Cretaceous tight sandstones in the depression have been studied using seismic profiles, borehole images, cores and thin-sections. Results show that thrust faults, two types of opening-mode macrofractures and two types of microfractures are present. Thrust faults were generated during Cenozoic N–S-directed tectonic shortening and have hydraulically linked Jurassic source rocks and Cretaceous sandstones. Opening-mode fractures can be subdivided on the basis of sizes, filling characteristics and distribution patterns. Type 1 macrofractures are barren or mainly calcite-lined. They have straight traces with widths (opening displacements) that are of the order of magnitude of 10 μm, suggesting that their primary role is that of migration channels. Type 2 macrofractures are calcite-filled opening-mode fractures. They have an elliptical or tabular shape with sharply tapering tips. Transgranular microfractures are lens-shaped and open or filled mostly by calcite; maximum widths range between 0.01 mm and 0.1 mm. Intragranular microfractures are the most common microfracture type. They are filled by calcite, feldspar or quartz. The macrofractures and transgranular microfractures have regular distributions, while most intragranular microfractures are irregularly distributed owing to their inherited origin. The results imply that natural fractures in the tight sandstones were formed as tectonic, diagenetic and natural hydraulic origins. In situ stress and cementation analyses suggest that Type 1 macrofractures and their genesis-related microfractures have controlled the present flow system of the tight sandstones.

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Natural fractures within unconventional reservoirs of Linxing Block, eastern Ordos Basin, central China

Shen

et al. 2020

Front. Earth Sci.

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Quantitative fracture evaluation method based on core-image logging: A case study of Cretaceous Bashijiqike Formation in ks2 well area, Kuqa depression, Tarim Basin, NW China

Cited by 31 publications

References 5 publications

A New Approach of Well Productivity Evaluation for Fractured Buried Hill Gas Reservoirs Based on Imaging Logging Data

A New Approach of Well Productivity Evaluation for Fractured Buried Hill Gas Reservoirs Based on Imaging Logging Data

Natural fractures at depth in the Lower Cretaceous Kuqa Depression tight sandstones: identification and characteristics

Natural fractures within unconventional reservoirs of Linxing Block, eastern Ordos Basin, central China

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