Pore structure characteristics of an ultradeep carbonate gas reservoir and their effects on gas storage and percolation capacities in the Deng IV member, Gaoshiti-Moxi Area, Sichuan Basin, SW China

Wang, Lu; He, Yiqian; Peng, Xian; Deng, Hui; Liu, Yicheng; Xu, Wei

doi:10.1016/j.marpetgeo.2019.08.012

Cited by 52 publications

(31 citation statements)

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“…Fractures can be observed on the surface of fracture-pore and fracture-cavity type cores, and the development of fractures is quite different; the latter contains some cavities, which leads to a higher porosity (Figure 6c,d). The development and distribution characteristics of cavities and fractures lead to a weak correlation between porosity and permeability [14]. Fracture-pore type reservoirs show the characteristics of "low-porosity and high-permeability", while pore-type reservoirs show "high-porosity and low-permeability" characteristics.…”

Section: Pore Structure and Sb Distribution Characteristicsmentioning

confidence: 99%

“…The variable sedimentary environment and accumulation process lead to a complex pore structure of deep carbonate gas reservoirs, including pores, cavities and fractures, and the physical properties are quite different between layers [9][10][11][12]. Moreover, some pores and fractures in the Sinian and Cambrian reservoirs are filled with solid bitumen (SB) [13,14]. Although SB can provide information about geological changes [15][16][17][18], it creates greater challenges for reservoir analysis and development.…”

Section: Introductionmentioning

confidence: 99%

“…On the one hand, the Cambrian carbonate gas reservoirs in Sichuan Basin are rich in reserves, with obvious pore structures and SB distribution characteristics [3,5,9]. On the other hand, the porosity and permeability of the reservoirs in the Gaoshiti-Longnusi area are relatively low, and SB has great influence on reservoir identification and development [13,14]. Based on this, we take the Cambrian Longwangmiao carbonate gas reservoir in the Gaoshiti-Longnusi area as our target.…”

Section: Introductionmentioning

confidence: 99%

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Influence of Pore Structure and Solid Bitumen on the Development of Deep Carbonate Gas Reservoirs: A Case Study of the Longwangmiao Reservoir in Gaoshiti–Longnusi Area, Sichuan Basin, SW China

Chen

Yang

et al. 2020

Energies

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A variable sedimentary environment and accumulation process leads to a complex pore structure in deep carbonate gas reservoirs, and the physical properties are quite different between layers. Moreover, some pores and throats are filled with solid bitumen (SB), which not only interferes with reservoir analysis, but also affects efficient development. However, previous studies on SB mainly focused on the accumulation process and reservoir analysis, and there are few reports about the influence on development. In this paper, through scanning electron microscope analysis, SB extraction, gas flow experiments and depletion experiments, and a similar transformation between experimental results and reservoir production, the production characteristics of carbonate gas reservoirs with different pore structures were studied, and the influence of SB on pore structure, reservoir analysis and development were systematically analyzed. The results show that permeability is one of the key factors affecting gas production rate and recovery, and the production is mainly contributed by high-permeability layers. Although the reserves are abundant, the gas production rate and recovery of layers with a low permeability are relatively low. The SB reduces the pore and throat radius, resulting in porosity and permeability being decreased by 4.73–6.28% and 36.02–3.70%, respectively. With the increase in original permeability, the permeability loss rate decreases. During development, the loss rate of gas production rate is much higher than that of permeability. Increasing the production pressure difference is conducive to reducing the influence. SB also reduces the recovery, which leads to the loss rate of gas production being much higher than that of porosity. For reservoirs with a high permeability, the loss rates of gas production rate and the amount produced are close to those of permeability and porosity. Therefore, in the reservoir analysis and development of carbonate gas reservoirs bearing SB, it is necessary and significant to analyze the influence of reservoir types.

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Section: Pore Structure and Sb Distribution Characteristicsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Influence of Pore Structure and Solid Bitumen on the Development of Deep Carbonate Gas Reservoirs: A Case Study of the Longwangmiao Reservoir in Gaoshiti–Longnusi Area, Sichuan Basin, SW China

Chen

Yang

et al. 2020

Energies

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“…With the advanced technology and growing demand for oil and gas, increasing attention has been paid to the development of unconventional oil and gas resources [1]. Unconventional reservoirs have multiple types of pore spaces, complex pore structures, and various mineral compositions and usually feature a high degree of heterogeneity and multiscale characteristics [2][3][4]. The flow mechanisms in unconventional reservoirs are greatly affected by microscale effects, and it is very challenging to describe the complex pore structures accurately and transmission characteristics of such porous media [5].…”

Section: Introductionmentioning

confidence: 99%

A New Upscaling Method for Fluid Flow Simulation in Highly Heterogeneous Unconventional Reservoirs

Zhang

et al. 2020

Geofluids

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High heterogeneity and nonuniformly distributed multiscale pore systems are two characteristics of the unconventional reservoirs, which lead to very complex transport mechanisms. Limited by inadequate computational capability and imaging field of view, flow simulation cannot be directly performed on complex pore structures. The traditional methods usually coarsen the grid to reduce the computational load but will lead to the missing microstructure information and inaccurate simulation results. To develop a better understanding of flow properties in unconventional reservoirs, this study proposed a new upscaling method integrated gray lattice Boltzmann method (GLBM) and pore network model (PNM), accounting for the fluid flow in heterogeneous porous media. This method can reasonably reduce the computational loads while preserving certain micropore characteristics. Verifications are conducted by comparing the simulation and experimental results on tight sandstones, and good agreements are achieved. The proposed method is proven to be capable of estimating bulk properties in highly heterogenous unconventional reservoirs. This method could contribute to the development of multiscale pore structure characterizations and enhance the understandings of fluid flow mechanisms in unconventional reservoirs.

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“…5,30,31 The systematic evaluation of the parameters of underground gas storage is a higherlevel evaluation work which depends on the increase of a large number of new data (static and dynamic data) and more detailed research. 27,28,[32][33][34][35] Currently, most of the basic geological research in this field follows the conventional gas reservoir geology theory without a selfcontained system, and relatively few domestic and foreign-related documents have been published. However, currently, the main research focus is the 'reconstruction' of the geological body, which aims to clarify the differences between the geological research process of gas storage and that of gas reservoirs in order to provide a good theoretical basis for future processes, such as construction, expansion, and operation.…”

mentioning

confidence: 99%

Estimating reservoir parameters and gas storage volume available in the DU6 gas field, Northeast China

Wang

2021

Int J Energy Res

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This study comprehensively evaluated the feasibility of the DU6 gas reservoir for gas storage in terms of storage performance, safety, and effectiveness. First, based on the fine division of small layers in the target area, the existing sedimentary facies markers, and paleoenvironment were identified and the fan delta front subfacies sedimentary model was established. The microfacies included an underwater distributary channel, mouth bar, sand sheet, and interdistributary bay, and the horizontal and vertical distributions of the effective reservoir sandstone were determined. Then, using petrophysical experimental data, the macroscopic and microstructural characteristics of the reservoir rock were examined, and the type and composition characteristics of the sandstone, pores, and the connectivity between pores were evaluated. By employing mechanical experiments, it was found that the sandstone permeability change rate with pressure is very large, reaching as high as 50%. In addition, the relationship between the pressure and rock micropore structure change was established. Finally, based on the fine reservoir characterization, the potential of transforming DU6 reservoir into gas storage was evaluated, and the sealing properties of its faults, top caprocks, and surrounding water were identified. The effective pore volume for underground gas storage was determined quantitatively, and the utilization rates of pores were calculated according to different sedimentary microfacies. Overall, the available gas sand body volume of the DU6 gas reservoir was found to be 9048 × 10 4 m 3 , with a gas storage capacity reaching 99.27 × 10 8 m 3 . These results will provide reliable technical support for the successful reconstruction of underground gas storage areas.

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Pore structure characteristics of an ultradeep carbonate gas reservoir and their effects on gas storage and percolation capacities in the Deng IV member, Gaoshiti-Moxi Area, Sichuan Basin, SW China

Cited by 52 publications

References 53 publications

Influence of Pore Structure and Solid Bitumen on the Development of Deep Carbonate Gas Reservoirs: A Case Study of the Longwangmiao Reservoir in Gaoshiti–Longnusi Area, Sichuan Basin, SW China

Influence of Pore Structure and Solid Bitumen on the Development of Deep Carbonate Gas Reservoirs: A Case Study of the Longwangmiao Reservoir in Gaoshiti–Longnusi Area, Sichuan Basin, SW China

A New Upscaling Method for Fluid Flow Simulation in Highly Heterogeneous Unconventional Reservoirs

Estimating reservoir parameters and gas storage volume available in the DU6 gas field, Northeast China

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