Water and gas distribution and its controlling factors of large scale tight sand gas fields: A case study of western Sulige gas field, Ordos Basin, NW China

Meng, Dewei; Jia, Ailin; Ji, Guang; He, Dengfa

doi:10.1016/s1876-3804(16)30077-5

Cited by 32 publications

(18 citation statements)

References 4 publications

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“…The basic properties of the tight sandstone cores used in this study are shown in Table 1. Tight sandstone gas reservoirs are characterized by low permeability, high heterogeneity, and high water saturation [22,27]. During the depletion-drive development, the reservoir pressure gradually decreases, and the pressure within the gas well drainage radius will exhibit a decreasing drawdown curve from the distal reservoir to the proximal.…”

Section: Experimental Samples and Methodsmentioning

confidence: 99%

Experimental Study on the Effective Utilization of Reserves in Tight Sandstone Gas Reservoirs and Their Applications

et al. 2020

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The effective utilization of reserves in tight sandstone reservoirs is one of the major concerns in terms of the development of tight sandstone gas reservoirs. However, the characteristics of reserve utilization are not fully understood, and many uncertainties still exist in the process. For this purpose, long cores on the Su 6 block of Sulige tight sandstone gas field in China were selected, and a multipoint embedded measurement system was established to study the characteristics of effective reserve utilization. Then, the effects of the related reservoir properties and production parameters were investigated. Based on the similarity theory, the effective conversion relationship between the physical experiment and the actual field production was established. The results showed that the pressure distribution in the exploitation of tight gas reservoir is nonlinear, and water cut in the reservoir will hinder the effective utilization of reserves. The lower the reservoir permeability, the larger the negative effect of water on reservoir utilization. Lower gas production rate and higher original pressure are associated with a smoother drawdown curve, which results in larger reserve utilization. The moving boundary expands with time, and its initial propagation velocity increase and then decrease. Additionally, the water cut in the reservoir can delay the spread of moving boundary propagation. The experimental results are consistent with the actual results of the field production by the similarity criterion, which can reflect and predict the production performance in tight gas reservoirs effectively. These results can provide a better understanding of reservoir pressure distribution and effective utilization of reserves to optimize the gas recovery and development benefit in tight sandstone gas reservoirs.

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Section: Experimental Samples and Methodsmentioning

confidence: 99%

Experimental Study on the Effective Utilization of Reserves in Tight Sandstone Gas Reservoirs and Their Applications

et al. 2020

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“…The Upper Palaeozoic strata in the SGF is approximately 700 m thick and consists of Carboniferous Benxi and Taiyuan formations, Shanxi Formation, Lower Shihezi Formation, Upper Shihezi Formation, and Permian Shiqianfeng Formation (Meng, Jia, Ji, & He, ). The contact relationship between the Shanxi and Taiyuan formations is a disconformity.…”

Section: Geological Settingmentioning

confidence: 99%

Potentials of low permeability gas in intracratonic basin: Insights from sedimentary facies of the Shan1 Member in the Su6‐Zhao42 Block of the Sulige gas field, Ordos Basin

Wang

Liu

et al. 2017

Geological Journal

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The Sulige gas field is a typical low permeability gas field with multi‐thin layer of pay zones. The upper member of the Shanxi Formation (Shan1) is the primary productive layer of the Su6‐Zhao42 area, located in the north‐west of the Shanbei Slope of the Sulige gas field. The Shan1 Member could be divided into 3 tiny sequences by coring and well logging data. On the basis of sedimentary sequence analysis, the sedimentary environment and facies are studied combined with lithological information, logging data, and sampling. This paper summarizes the characteristics and distribution of the sedimentary facies of the Shan1 Member in the Su6‐Zhao42 area. During the deposition of the Shan1 Member, this area developed a meandering river sedimentary facies, which can be subdivided into meandering riverbed, river floodplain, and abandoned channel subfacies. The sedimentary facies of meandering river in the Shan1 Member are characterized by point bars, crevasse splays, floodplains, flood swamps, and abandoned channels. The sedimentary facies bands extend roughly east‐west parallel to the meandering river. It is indicated that the sand bodies deposited in river channel have better physical conditions and larger thickness for gas accumulation based on the analysis of physical characteristics and seismic attributes. The effective reservoir, being controlled by the sedimentary facies belt, distributes along a NE–SW trending belt where is the favourable area for the gas reservoir.

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“…The Northern Tianhuan (NT) in the Ordos Basin is adjacent to the largest gas field in China, the Sulige gas field, and is considered a potential high-yield area due to its special geographical pattern . However, the high-water production and the complicated gas–water relationship limit the exploration and development process in this area . Although there have been studies on the characteristics of formation water and the diagenesis of reservoir rocks, the influence of formation water on hydrocarbon accumulation and the indication of favorable areas remain unclear.…”

Section: Introductionmentioning

confidence: 99%

“… 30 However, the high-water production and the complicated gas–water relationship limit the exploration and development process in this area. 31 Although there have been studies on the characteristics of formation water and the diagenesis of reservoir rocks, the influence of formation water on hydrocarbon accumulation and the indication of favorable areas remain unclear. Therefore, in this work, we analyzed the geochemical composition of the formation water from the He8 Member of Permian in the Ordos Basin (a typical tight sandstone strata deposited at Upper Paleozoic) and assessed its relationship with the distribution of hydrocarbons.…”

Section: Introductionmentioning

confidence: 99%

Indication of Formation Water Geochemistry for Hydrocarbon Preservation: New Applications of Machine Learning in Tight Sandstone Gas Reservoirs

Yang

Wang

et al. 2022

ACS Omega

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The migration of formation water plays a crucial role in hydrocarbon accumulation and preservation. The hydrodynamic field controls the content of various ions in formation water and is an important participant in hydrocarbon evolution. One potential high-yield gas field is the tight sandstone gas reservoirs in the northern Tianhuan Depression of the Ordos Basin, China. However, due to the complex gas–water relationship and limited water sample data, the development of gas reservoirs has encountered great difficulties; we thus analyzed the geochemical characteristics of a large scale of formation water acquired from the Permian in the Ordos Basin (60 water samples collected from 45 wells in the He8 Member). The results showed that formation water is the original sedimentary water in tight sandstone reservoirs, which represent a closed hydrological environment, which is conducive to gas accumulation. This is also related to the demonstrated strong water–rock reaction and diagenetic. We also developed a statistical model between these geochemical parameters and gas preservation based on machine learning algorithms (decision trees). Note that machine learning, as a data-driven artificial intelligence algorithm, generates massive correlation models that can learn from the structured training data sets to carry out predictions or evaluations in newly presented data. This algorithm can process large amounts of information data more quickly and can build more perfect correlation models through deep learning mechanisms than traditional statistical methods. The results suggest that the metamorphism coefficient has the best indication effect on the preservation of gas reservoirs. The hydrological environment with (Cl–-Na+)/Mg2+ > 50.066, Na+/Cl– ≤ 0.476, and Ma2+/Ca2+ ≤ 0.102 is a good hydrocarbon accumulation area. This study can be applied, by analogy, to more comprehensively interpret the correlation between the geochemical characteristics of formation water and hydrocarbon storage and to improve the accuracy of predicting favorable hydrocarbon accumulation areas in tight sandstone gas reservoirs.

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Water and gas distribution and its controlling factors of large scale tight sand gas fields: A case study of western Sulige gas field, Ordos Basin, NW China

Cited by 32 publications

References 4 publications

Experimental Study on the Effective Utilization of Reserves in Tight Sandstone Gas Reservoirs and Their Applications

Experimental Study on the Effective Utilization of Reserves in Tight Sandstone Gas Reservoirs and Their Applications

Potentials of low permeability gas in intracratonic basin: Insights from sedimentary facies of the Shan1 Member in the Su6‐Zhao42 Block of the Sulige gas field, Ordos Basin

Indication of Formation Water Geochemistry for Hydrocarbon Preservation: New Applications of Machine Learning in Tight Sandstone Gas Reservoirs

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