A comprehensive porosity prediction model for the Upper Paleozoic tight sandstone reservoir in the Daniudi gas field, Ordos Basin

Qiu, Longwei; Yang, Shuangchun; Qu, Changsheng; Xu, Ningning; Gao, Qingsong; Zhang, Xiangjin; Liu, Xugang; Wang, Donghui

doi:10.1007/s12583-016-0935-2

Cited by 16 publications

(5 citation statements)

References 8 publications

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“…As the sorting coefficient increases, there is a decline tendency in reservoir porosity toward lower levels (Figure B). Therefore, sedimentation is the primary factor controlling the lithofacies, grain size, and sorting of sandstones, ultimately influencing its physical properties. ,, …”

Section: Discussionmentioning

confidence: 99%

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Characteristics and Controlling Factors of Tight Gas Sandstones from the Upper Shanxi and Lower Shihezi Formations in the Northern Sulige Area, Ordos Basin, China

Xu,

Yu,

et al. 2023

Energy Fuels

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Tight sandstone gas reservoirs with ultralow porosity (<10%) and permeability (<1.0 mD) in the Ordos Basin exhibit enormous resource potential. In this work, the characteristics of highquality tight sandstone reservoirs in the eighth member of the Shihezi Formation (He 8) and the first member of the Shanxi Formation (Shan 1) of the northern Sulige area are investigated. To study the characteristics and controlling factors of the tight sandstone, various technical methods, including casting thin sections, scanning electron microscopy (SEM), X-ray diffraction (XRD), mercury injection capillary pressure (MICP), and spontaneous imbibition, are conducted on typical sandstone samples. The results show that the He 8 and Shan 1 sandstones predominantly consist of medium-to fine-grained sandstones with high compositional maturity levels. These sandstone reservoirs have low porosity (mainly <12%) and ultralow permeability (mainly <0.5 mD), with a good correlation between porosity and permeability. Intragranular dissolved pores are predominant in both the He 8 and Shan 1 sandstones. In comparison to the He 8 Member, sandstones from the Shan 1 Member are much tighter, resulting in lower porosity and poor pore connectivity. Sedimentation and diagenesis play crucial roles in the development of high-quality reservoirs in the study area. High-quality reservoirs, mainly developed in the point bar and braided bar, are fine−medium sandstones with good sorting, followed by natural levee. Destructive diagenesis, including compaction and cementation, has significantly reduced pore volumes and reservoir physical properties, while extensive dissolution pores are generated by dissolution to improve reservoir space. Moreover, the presence of chlorite rims with an appropriate content can enhance the physical properties of sandstone reservoirs. Therefore, the findings of this work are beneficial for the predication and identification of high-quality reservoirs in the Ordos Basin, thus providing a foundation for further exploration of favorable reservoirs.

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Section: Discussionmentioning

confidence: 99%

“…Therefore, sedimentation is the primary factor controlling the lithofacies, grain size, and sorting of sandstones, ultimately influencing its physical properties. 11,12,51 5.2.3. Diagenesis.…”

Section: Controlling Factors Of Amentioning

confidence: 99%

Characteristics and Controlling Factors of Tight Gas Sandstones from the Upper Shanxi and Lower Shihezi Formations in the Northern Sulige Area, Ordos Basin, China

Xu,

Yu,

et al. 2023

Energy Fuels

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“…1), lying north from Ejin Horo, south of Ansai, west of Hengshan, and east of Fugu. The studied area is a typical ultra-low porosity and ultra-low permeability gas reservoir, exhibiting poor reservoir physical properties, strong heterogeneity, and a complicated micropore structure (Ding et al, 2016;Yang et al, 2017;Fu et al, 2018).…”

Section: Geological Settingsmentioning

confidence: 99%

“…In recent years, the focus of oil and gas exploration activities has shifted from high-quality reservoirs to tight reservoirs and from further exploration of local traps to exploration of large areas and whole basins. Thus, the exploitation of unconventional energy has played a leading role on guiding the thought of current exploration (Zhai et al, 2012;Hefley et al, 2014;Jiang et al, 2015;Mason et al, 2015;Qiu et al, 2017;Zhang et al, 2018). Unconventional oil and gas resources have great potential.…”

Section: Introductionmentioning

confidence: 99%

Controlling Effects of Tight Reservoir Micropore Structures on Seepage Ability: A Case Study of the Upper Paleozoic of the Eastern Ordos Basin, China

Yang

et al. 2020

Acta Geologica Sinica (Eng)

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In this study, the types of micropores in a reservoir are analyzed using casting thin section (CTS) observation and scanning electron microscopy (SEM) experiments. The high-pressure mercury injection (HPMI) and constant-rate mercury injection (CRMI) experiments are performed to study the micropore structure of the reservoir. Nuclear magnetic resonance (NMR), gas-water relative seepage, and gas-water two-phase displacement studies are performed to examine the seepage ability and parameters of the reservoir, and further analyses are done to confirm the controlling effects of reservoir micropore structures on seepage ability. The experimental results show that Benxi, Taiyuan, Shanxi, and Shihezi formations in the study area are typical ultra-low porosity and ultra-low permeability reservoirs. Owing to compaction and later diagenetic transformation, they contain few primary pores. Secondary pores are the main pore types of reservoirs in the study area. Six main types of secondary pores are: intergranular dissolved pores, intragranular dissolved pores, lithic dissolved pores, intercrystalline dissolved pores, micropores, and microfracture. The results show that reservoirs with small pore-throat radius, medium displacement pressure, and large differences in pore-throat structures are present in the study area. The four types of micropore structures observed are: lower displacement pressure and fine pores with medium-fine throats, low displacement pressure and fine micropores with fine throats, medium displacement pressure and micropores with micro-fine throats, and high displacement pressure and micropores with micro throats. The micropore structure is complex, and the reservoir seepage ability is poor in the study areas. The movable fluid saturation, range of the gas-water two-phase seepage zone, and displacement types are the three parameters that well represent the reservoir seepage ability. According to the characteristic parameters of microscopic pore structure and seepage characteristics, the reservoirs in the study area are classified into four types (I-IV), and types I, II, and III are the main types observed. From type I to type IV, the displacement pressure increases, and the movable fluid saturation and gas-water two-phase seepage zone decrease, and the displacement type changes from the reticulation-uniform displacement to dendritic and snake like. Key words: micro-pore structure, seepage ability, movable fluid saturation, the range of gas-water two phase seepage zone, displacement types Citation: Yang et al., 2020. Controlling Effects of Tight Reservoir Micropore Structures on Seepage Ability: A Case Study of the Upper

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“…Thus, the interlayer contradictions become prominent and the oilfield development is seriously affected. Many cases on the developmental laws of waterflooding performance via commingling production in multilayer reservoirs have been recorded in different oilfields in the U.S. [1][2][3], China [4][5][6][7][8][9][10][11], Canada [12,13] and Australia [14].…”

Section: Introductionmentioning

confidence: 99%

Evaluation of the Vertical Producing Degree of Commingled Production via Waterflooding for Multilayer Offshore Heavy Oil Reservoirs

Shen

Cheng

Sun³

et al. 2018

Energies

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Recently, commingling production has been widely used for the development of offshore heavy oil reservoirs with multilayers. However, the differences between layers in terms of reservoir physical properties, oil properties and pressure have always resulted in interlayer interference, which makes it more difficult to evaluate the producing degree of commingled production. Based on the Buckley–Leverett theory, this paper presents two theoretical models, a one-dimensional linear flow model and a planar radial flow model, for water-flooded multilayer reservoirs. Through the models, this paper establishes a dynamic method to evaluate seepage resistance, sweep efficiency and recovery percent and then conducts an analysis with field data. The result indicates the following: (1) the dynamic difference in seepage resistance is an important form of interlayer interference during the commingled production of an offshore multilayer reservoir; (2) the difference between commingled production and separated production is small within a certain range of permeability ratio or viscosity ratio, but separated production should be adopted when the ratio exceeds a certain value.

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A comprehensive porosity prediction model for the Upper Paleozoic tight sandstone reservoir in the Daniudi gas field, Ordos Basin

Cited by 16 publications

References 8 publications

Characteristics and Controlling Factors of Tight Gas Sandstones from the Upper Shanxi and Lower Shihezi Formations in the Northern Sulige Area, Ordos Basin, China

Characteristics and Controlling Factors of Tight Gas Sandstones from the Upper Shanxi and Lower Shihezi Formations in the Northern Sulige Area, Ordos Basin, China

Controlling Effects of Tight Reservoir Micropore Structures on Seepage Ability: A Case Study of the Upper Paleozoic of the Eastern Ordos Basin, China

Evaluation of the Vertical Producing Degree of Commingled Production via Waterflooding for Multilayer Offshore Heavy Oil Reservoirs

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