Tight sandstone gas accumulation mechanism and development models

Jiang, Zhenxue; Li, Zhuo; Feng, Long; Pang, Xiongqi; Yang, Wei; Liu, Luofu; Jiang, Fujie

doi:10.1007/s12182-015-0061-6

Cited by 51 publications

(21 citation statements)

References 13 publications

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“…For the efficient tight reservoir exploitation and planning of possible fracturing processes, it is crucial to accurately determine the depth of the horizons with the best reservoir properties and flow capabilities. In the literature, there were many different rock type classification models presented, and the author tested three models to find the best indicator of different flow unit in tight formation (Jiang et al 2015;Ilkhchi et al 2014). The first model was based on the heterogeneous rock analysis (HRA) clustering workflow to define rock units.…”

Section: Rock Type Prediction Models: Descriptionmentioning

confidence: 99%

Petrophysical rock typing and permeability prediction in tight sandstone reservoir

Lis-Śledziona

2019

Acta Geophys.

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In this paper, the low-permeability reservoir was subdivided into several units based on three models; in the first model, porosity, permeability, pore sizes, and shale volume were used as an input in the heterogeneous rock analysis clustering workflow to define rock units; in the second model, rock types were defined using flow zone index. The third flow unit discriminator was proposed by the author; the model is based on relation between porosity, permeability, irreducible water saturation, and pore size distribution. Also, Wyllie-Rose equation for permeability in tight reservoir was core-calibrated, and coefficients e, d, and Kw were established. The reservoir is built of thin layers of sandstones with variable porosity, permeability, pore sizes, and irreducible water. The research was performed in two wells where as input well log data, the laboratory results of mercury injection porosimetry, permeability measurements, and nuclear magnetic resonance data were used. Furthermore, it was investigated whether the presence of fractures identified on XRMI images were strictly related to one flow unit.

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Section: Rock Type Prediction Models: Descriptionmentioning

confidence: 99%

Petrophysical rock typing and permeability prediction in tight sandstone reservoir

Lis-Śledziona

2019

Acta Geophys.

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“…The anomalous distribution of fluids in the Ahe Formation is closely related to the oil and gas accumulation process. Jiang et al (2015) classified tight sandstone gas reservoirs into three types based on the timing of gas charging and reservoir tightening, namely the accumulation-densification, densification-accumulation, and composite types. The three types of reservoir differ in terms of the reservoir-forming dynamics and fluid distribution.…”

Section: Hydrocarbon Accumulation Stage and Accumulation Processmentioning

confidence: 99%

Fluid geochemistry of the Jurassic Ahe Formation and implications for reservoir formation in the Dibei area, Tarim Basin, northwest China

Zhao

Wen

Wang

et al. 2018

Energy Exploration & Exploitation

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The condensate gas reservoirs of the Jurassic Ahe Formation in the Dibei area of the Tarim Basin, northwest China are typical tight sandstone gas reservoirs and contain abundant resources. However, the hydrocarbon sources and reservoir accumulation mechanism remain debated. Here the distribution and geochemistry of fluids in the Ahe gas reservoirs are used to investigate the formation of the hydrocarbon reservoirs, including the history of hydrocarbon generation, trap development, and reservoir evolution. Carbon isotopic analyses show that the oil and natural gas of the Ahe Formation originated from different sources. The natural gas was derived from Jurassic coal measure source rocks, whereas the oil has mixed sources of Lower Triassic lacustrine source rocks and minor amounts of coal-derived oil from Jurassic coal measure source rocks. The geochemistry of light hydrocarbon components and n-alkanes shows that the early accumulated oil was later altered by infilling gas due to gas washing. Consequently, n-alkanes in the oil are scarce, whereas naphthenic and aromatic hydrocarbons with the same carbon numbers are relatively abundant. The fluids in the Ahe Formation gas reservoirs have an unusual distribution, where oil is distributed above gas and water is locally produced from the middle of some gas reservoirs. The geochemical characteristics of the fluids show that this anomalous distribution was closely related to the dynamic accumulation of oil and gas. The period of reservoir densification occurred between the two stages of oil and gas accumulation, which

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“…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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Tight sandstone gas accumulation mechanism and development models

Cited by 51 publications

References 13 publications

Petrophysical rock typing and permeability prediction in tight sandstone reservoir

Petrophysical rock typing and permeability prediction in tight sandstone reservoir

Fluid geochemistry of the Jurassic Ahe Formation and implications for reservoir formation in the Dibei area, Tarim Basin, northwest China

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

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