Characterization of marine-terrigenous transitional Taiyuan formation shale reservoirs in Hedong coal field, China

Li, Kunjie; Chen, Gang; Li, Wei; Wu, Xinlong; Tan, Jinchong; Qu, Jiangwen

doi:10.26804/ager.2018.01.07

Cited by 16 publications

(5 citation statements)

References 28 publications

(22 reference statements)

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“…2(c)). A possible explanation for this phenomenon is the oil micro-migration from areas rich in organic materials to neighboring regions with poor TOC contents, and such a micro-migration has a considerable impact on both the distribution and composition of shale oil, as indicated by Li and Cai (2023a) and Hu et al (2024). Within these spaces, oil molecules, described as dense, highly viscous, chemically intricate liquid hydrocarbons with a high carbonto-hydrogen ratio (He et al, 2015;Bai et al, 2023), could predominantly exist in both free and adsorbed states (Zhang et al, 2019;Li et al, 2021Li et al, , 2023bXu et al, 2022).…”

Section: Analyses Of Oil Occurrence Statusmentioning

confidence: 99%

“…The topics of ultra-low matrix permeability (Zhang et al, 2023), wide pore size distribution (PSD) (Sakurovs et al, 2012;Kuila and Prasad, 2013;Xu, 2020), complex oil occurrence status (Xu et al, 2022), and µm-scale mixed wettability (Hu et al, 2015) have emerged as crucial foci for an efficient development of shale oil, thereby receiving considerable studies. However, despite recent advancements (Wang et al, 2016;Hu et al, 2021;Li and Cai, 2023a), achieving direct nm-scale insights of oil occurrence status still remains challenging, resulting in a gap of a comprehensive understanding of shale oil mobility within pore spaces and subsequent production in wellbores (He et al, 2015;Saif et al, 2016).…”

Section: Introductionmentioning

confidence: 99%

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Small angle neutron scattering studies of shale oil occurrence status at nanopores

Zhang,

Hu,

Tian

et al. 2024

Adv. Geo-Energy Res.

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Utilizing small angle neutron scattering techniques on organic shales, this study presents an innovative approach for characterizing the status of oil occurrence, and new insights into pore scale assessment through scattering vector-pore size relationship. The results indicate the successful identification of different shale oil occurrence status, before and after solvent extraction of residual oil for four shale samples with different contents of total organic carbon. In addition, coupled with density distribution analyses, the work demonstrates that shale samples with lower total organic carbon contents typically signify a smaller radius of gyration with better oil mobility, which indicates a greater wave oscillation with a larger pore size to be estimated from the scattering vector. This work also elucidates the notable scenarios of an increasing pore size could correspond to a decreasing radius of gyration caused by mass density redistribution. For polydisperse systems, this research illustrates the variations in pore volumetric ratio impact the scattering intensity, whereas pore scale changes affect the oscillation pattern. This novel research of analyzing mass density distribution and pore scale information in real space is also suitable for other porous media systems.

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Section: Analyses Of Oil Occurrence Statusmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Small angle neutron scattering studies of shale oil occurrence status at nanopores

Zhang,

Hu,

Tian

et al. 2024

Adv. Geo-Energy Res.

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“…With the development of the global economy, the exploration and development process of oil and gas resources continues to expand, and a tight sandstone reservoir has been proven to be a main force in the world energy supply (Li et al, 2018;Xu et al, 2019a). A tight sandstone reservoir is typically classified as a reservoir with permeability less than 0.1 mD, which is not economically producible for a long history (Kazemi, 1982;Li et al, 2019).…”

Section: Introductionmentioning

confidence: 99%

Optimization of volume fracturing technology for shallow bow horizontal well in a tight sandstone oil reservoir

Gao

Cheng²,

Wang³

et al. 2023

Front. Energy Res.

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The physical property of Chang 6 reservoir in Yanchang oilfield is poor, and the heterogeneity is strong. Multistage fracturing of horizontal wells is easy to form only one large horizontal fracture, but it is difficult to control the fracture height and length. The new mining method of “bow horizontal well + multistage horizontal joint” can effectively increase the multistage horizontal joint’s spatial position, which improves the drainage area and stimulation efficiency of oil wells. Due to the reservoir’s low permeability and strong heterogeneity, the single well mode of “bow horizontal well + multistage horizontal fracture” cannot effectively produce Chang 6 reservoir. To improve the production degree of the g 6 reservoir, the fracture model is established using equivalent conductivity and the multigrid method. The pressure response functions of horizontal wells and volume fracturing horizontal wells are established by using the source function, and the relationship between reservoir permeability and starting pressure gradient in the block is calculated. On this basis, the reservoir productivity equation of the block is established, which provides a basis for optimizing the fracturing design parameters of horizontal wells. It is proposed that the flow unit should be considered in the design of fracturing parameters of horizontal fractures, the number of fractures should comprehensively consider whether the fractures can make each flow unit be used, and have large controlled reserves, and the scale of fracturing should comprehensively consider the output and cost. The fracture network model is established by using equivalent conductivity and multi-gridthod, and the volume fracturing design parameters of horizontal wells are optimized, considering the seepage characteristics of the flow unit. The fracturing design parameters of the horizontal section are further defined, which provides a theoretical basis for the efficient development of shallow tight reservoirs.

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“…An evaluation of favorable areas for gas exploration requires a comprehensive analysis with a focus on the generation, storage, and sealing characteristics of shale gas. An analysis of the accumulation conditions based on a single factor is insufficient to support the subsequent oil and gas exploration [14]. This study focuses on the Daning-Jixian area at the southeastern margin of the Ordos Basin.…”

Section: Introductionmentioning

confidence: 99%

Evaluation of the Accumulation Conditions and Favorable Areas of Shale Gas in the Upper Palaeozoic Marine-Continental Transitional Facies in the Daning-Jixian Area, Ordos Basin

Zeng

Wang²,

Cao

et al. 2022

Geofluids

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This study focuses on the organic-rich mud shale in the Upper Palaeozoic transitional facies in the southeastern margin of the Ordos Basin. It systematically analyzes the shale gas accumulation conditions of the organic-rich mud shale in the Lower Permian Shanxi-Taiyuan Formation, including the thickness, distribution, organic matter type and content, thermal maturity, reservoir space, gas-bearing property, and rock brittleness. The results show that the thick dark mud shale contains a high organic matter content, is a suitable kerogen type for gas generation, and exhibits moderate thermal evolution, providing excellent conditions for hydrocarbon accumulation. Residual primary pores formed by shale compaction, secondary pores formed by organic matter hydrocarbon generation, clay mineral transformation and dissolution, and fractures provide suitable reservoir spaces for shale gas. The shale in the study area has a higher gas content than the shale strata in the marine basins of the United States. In addition, the content of brittle minerals such as quartz is higher, and Poisson’s ratio is lower, facilitating the subsequent transformation. The accumulation conditions indicate the high potential of the study area for shale gas exploration and development. The geological analogy method is used to compare the study area with five major shale gas basins in the United States. The results indicate that the shale gas resources of the Shanxi-Taiyuan Formation in the study area are in the range of 2800– 3200 × 10 8 m3. The primary controlling factors affecting shale gas reservoirs in this area are the abundance of organic matter, thermal maturity, shale thickness, and quartz content. Favorable areas are predicted based on these factors.

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Characterization of marine-terrigenous transitional Taiyuan formation shale reservoirs in Hedong coal field, China

Cited by 16 publications

References 28 publications

Small angle neutron scattering studies of shale oil occurrence status at nanopores

Small angle neutron scattering studies of shale oil occurrence status at nanopores

Optimization of volume fracturing technology for shallow bow horizontal well in a tight sandstone oil reservoir

Evaluation of the Accumulation Conditions and Favorable Areas of Shale Gas in the Upper Palaeozoic Marine-Continental Transitional Facies in the Daning-Jixian Area, Ordos Basin

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