Characteristics and controlling factors of tight sandstone gas reservoirs in the Upper Paleozoic strata of Linxing area in the Ordos Basin, China

Zheng, Dingye; Pang, Xiongqi; Jiang, Fujie; Liu, Tieshu; Shao, Xinhe; Huyan, Yuying

doi:10.1016/j.jngse.2019.103135

Cited by 41 publications

(22 citation statements)

References 50 publications

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“…and Shiqianfeng Fm. consist of fluvial and lacustrine deposits, providing an effective sealing for the Permian tight sandstone gas [17,22] (Figure 2).…”

Section: Geological Settingsmentioning

confidence: 99%

“…The gas predominantly migrated vertically through the microfractures driven by gas expansion force from the source rocks and displaced the pore water in the near source rock reservoir [67]. Therefore, the hydrocarbon generation intensity and effective assemblages of source rocks and reservoirs are crucial for the gas accumulation of tight reservoirs [17]. Additionally, the consequent dissolution of feldspars and rock fragments greatly approved the reservoir properties, providing available spaces and favorable migration paths for natural gas (Figure 10).…”

Section: Coupling Among the Reservoir Densification Pressure Evolutio...mentioning

confidence: 99%

“…The continuous or quasi-continuous gas accumulations tended to be formed when the reservoir densification occurred before gas charging, which were generally characterized by extensive distribution without distinct boundaries, complicated gas-water contacts and abnormal original reservoir pressure [2,11,16]. It is very difficult for the gas to migrate over long distance due to the great capillary resistance and strong heterogeneity in this type of tight reservoir [17]. In contrast, if the gas charging was prior to the sandstone densification, the gas was prone to migrating over long distance and accumulating in the structural highs because of the good reservoir properties, which is analogous to the conventional gas accumulations [15].…”

Section: Introductionmentioning

confidence: 99%

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Reservoir Densification, Pressure Evolution, and Natural Gas Accumulation in the Upper Paleozoic Tight Sandstones in the North Ordos Basin, China

Wang

Shi

et al. 2022

Energies

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The vague understanding of the coupling relationship among natural gas charging, reservoir densification, and pressure evolution restricted the tight gas exploration in the Lower Shihezi Formation of the Hangjinqi area, north Ordos Basin. In this study, the quantitative porosity evolution model, the pressure evolution process, and the natural gas charging history of tight sandstone reservoirs were constructed by integrated investigation of the reservoir property, the thin section, SEM and cathode luminescence observations, the fluid inclusion analysis and the 1D basin modeling. The results show that the compaction and cementation reduced the primary porosity by 21.79% and 12.41%, respectively. The densification of the reservoir occurred at circa 230 Ma, which was before the natural gas charging time from 192 to 132 Ma. The paleo-overpressure within the tight reservoirs occurred since the Middle Jurassic with the pressure coefficients between 1.1 and 1.55. The continuous uplifting since the Late Cretaceous resulted in the under- and normal-pressure of the Lower Shihezi Formation with the pressure coefficients ranging from 0.67 to 1.05. The results indicate that the densification of the reservoirs was conducive to the formation of paleo-pressure produced by gas generating. The gas predominantly migrated vertically, driven by gas expansion force rather than buoyance and displaced the pore water in the reservoirs near source rocks.

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“…and Shiqianfeng Fm. consist of fluvial and lacustrine deposits, providing an effective sealing for the Permian tight sandstone gas [17,22] (Figure 2).…”

Section: Geological Settingsmentioning

confidence: 99%

Section: Coupling Among the Reservoir Densification Pressure Evolutio...mentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Reservoir Densification, Pressure Evolution, and Natural Gas Accumulation in the Upper Paleozoic Tight Sandstones in the North Ordos Basin, China

Wang

Shi

et al. 2022

Energies

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“…Tidal flat and sand flat sedimentary microfacies are mostly developed near the coastline and are divided into sand flat, mud flat and mixed flat microfacies. The main gas reservoirs in the LX block are concentrated in the upper Palaeozoic, namely, the Permian, and are divided into six groups, which constitute the main research objects of this paper [33].…”

Section: Geological Backgroundmentioning

confidence: 99%

Comparative study and discussion of diagenetic facies and conductivity characteristics based on experiments

Zhou

Zhang²,

Zhang³

2022

R. Soc. open sci.

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The study of conduction mechanisms is the key to establishing physical derivations, resistivity simulations and saturation models. The purpose of this research is to clarify conduction mechanisms under different diagenetic facies and build suitable saturation evaluation models. Experimental data of tight gas sandstone from the Ordos Basin were analysed, including data from scanning electron microscopy, conventional core physical property analysis, core casting thin-section analysis, core mercury intrusion experimentation and rock electrical conductivity experimentation. Accordingly, the diagenetic minerals of the study block were examined, and the diagenetic facies were classified by the differences in the diagenetic properties across the study area. The reservoir was divided into three types of diagenetic facies: construction facies, cementation facies and destruction facies. On this basis, the conductivity characteristics and saturation models of different diagenetic facies within the study area were systematically discussed for the first time. A number of experiments showed that according to the type of diagenesis, the structure of the pores and the influence of the reservoir, a classification scheme for diagenetic facies (consisting of construction, cementation and destruction facies) can be established. According to the influence of the diagenesis of various diagenetic facies, theoretical pore structure models of the three diagenetic facies were established, in which the construction facies includes mainly dissolved feldspar pores and intergranular pores, the destruction facies includes clay residual intergranular pores and intergranular pores, and the cementation facies includes primarily residual intergranular pores. Based on these theoretical pore structure models, the construction facies was evaluated with a pore-connected vuggy conductivity model, the destruction facies was evaluated with a non-connected matrix pore conductivity model, and the cementation facies was evaluated with a residual intergranular pore conductivity model. Then, the rationality of each model and the effects of the parameters in each model on the final cementation exponent were analysed by simulation. The predicted cementation exponents of the diagenetic facies match the measured cementation exponents well and can guide the qualitative description of these characteristics in such reservoirs.

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“…Saturation is one of the key parameters during reservoir interpretation, because it can directly indicate the oil and gas bearing property of the formation. However, different from the conventional reservoirs, tight sandstone reservoir is characterized by low porosity, low permeability, complex pore structure and high heterogeneity, which makes the conductive law of reservoir complicated, and the saturation evaluation is facing great challenges (Gao et al., 2019; Li et al., 2018; Zheng et al., 2020).…”

Section: Introductionmentioning

confidence: 99%

An improved saturation evaluation method of Chang 8 tight sandstone reservoir in Longdong West area of Ordos Basin, China

Bai

Tan

Shi

et al. 2021

Energy Exploration & Exploitation

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This study focus on saturation evaluation of Chang 8 tight sandstone reservoir in Longdong West area of Ordos Basin, China. An improved saturation calculation method was proposed based on the equivalent rock capillary bundle theory. Firstly, according to characteristics of reservoir pore structure and rock conductivity, the conductive space of reservoir rock is equivalent to the parallel conductive of micro capillary bundle representing the micro pores and the coarse capillary bundle representing the macro pores. Then, the variable cementation index(m) saturation model was deduced by using Poiseuille flow equation and Darcy's law. During the calculation of model parameters, the T2 spectrum data of nuclear magnetic resonance (NMR) was used to calculate the equivalent radius of reservoir micro pores and macro pores, which ensured the ability of model popularization and application. Finally, the proposed saturation calculation method is applied to reservoir evaluation of the study area, and compared with the classical Archie saturation model. The application effect shows that the calculated saturation from the proposed variable m model is much closer to the sealed coring data than that from classical Archie model, and the average relative error of saturation calculated by the variable m model is within 7%, which proves that the proposed saturation calculation method is applicable and effective.

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Characteristics and controlling factors of tight sandstone gas reservoirs in the Upper Paleozoic strata of Linxing area in the Ordos Basin, China

Cited by 41 publications

References 50 publications

Reservoir Densification, Pressure Evolution, and Natural Gas Accumulation in the Upper Paleozoic Tight Sandstones in the North Ordos Basin, China

Reservoir Densification, Pressure Evolution, and Natural Gas Accumulation in the Upper Paleozoic Tight Sandstones in the North Ordos Basin, China

Comparative study and discussion of diagenetic facies and conductivity characteristics based on experiments

An improved saturation evaluation method of Chang 8 tight sandstone reservoir in Longdong West area of Ordos Basin, China

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