Impacts of lithologic characteristics and diagenesis on reservoir quality of the 4th member of the Upper Triassic Xujiahe Formation tight gas sandstones in the western Sichuan Basin, southwest China

Yu, Yu; Lin, Liangbiao; Zhai, Changbo; Chen, Hongde; Wang, Yanan; Li, Yehan; Deng, Xiaoliang

doi:10.1016/j.marpetgeo.2019.04.040

Cited by 35 publications

(25 citation statements)

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“… 5 concluded that the lower the permeability and the stronger the heterogeneity in the layer are, the more complex the effect of water-flooding is. On the basis of reservoir core study and logging interpretation, 6 concluded that the effect of water-flooding is inversely proportional to the physical properties of the reservoir. By means of thin section observation and scanning electron microscope.…”

Section: Introductionmentioning

confidence: 99%

Water-flooding characteristics of lithologic reservoir in Ordos basin

Liu

Zhu

et al. 2021

Sci Rep

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Due to the poor situation of water-flooding mechanism research on Chang 4 + 5 reservoir of Ordos basin, the authors quantitatively studied the influence factors of water-flooding characteristics by sedimentology, casting thin sections, constant-speed mercury injection, scanning electron microscope as well as production records. The size and distribution of pore-throat were also found closely related with the water-flooding seepage law. The results show that the microscopic seepage paths of Chang 4 + 5 reservoir include uniform displacement, finger displacement and peak displacement, and their correspondent oil displacement efficiency reduces in turn under the same conditions. Reservoir heterogeneity, reservoir properties, distribution of pore structure and wettability play a decisive role in water-flooding efficiency. Generally, When the intra-layer range is greater than 4.65, the breakthrough coefficient is greater than 3.54, the coefficient of variation is greater than 0.7, the distribution frequency of inter-layer is greater than 0.5 per meter, and the distribution density is greater than 0.435%, the range between layers is greater than 6.86, the breakthrough coefficient is greater than 2.58, the coefficient of variation is greater than 0.51, and the thickness of inter-layer is greater than 7.54 m. the increasing trend of oil displacement efficiency will be obviously weakened.

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Section: Introductionmentioning

confidence: 99%

Water-flooding characteristics of lithologic reservoir in Ordos basin

Liu

Zhu

et al. 2021

Sci Rep

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“…Feldspars can be dissolved (R1) by organic acid and meteoric water in shallow open systems at relatively low temperatures (Bjørlykke & Jahren, 2012). The temperature range of silica cement (Figure 11a) shows that there were few samples near the temperature of feldspar dissolution (60 C) (Yu et al, 2019;Zeng, Zhu, Wu, & Peng, 2007).…”

Section: Source Of Silica Cementmentioning

confidence: 99%

“…shows that carbonate cementation has a wide temperature range and might have occurred at different stages of diagenesis. With increasing burial depth, the transformation of clay minerals is likely to release Ca 2+ , Fe 2+ , and Mg 2+ (Yu et al, 2019). The relatively low positive δ 13 C values from −0.85‰ to 3.58‰ (with an average of 1.1‰) suggest that carbonate cement mainly formed due to bacterial fermentation under methanogenic conditions (Figure 14) (Irwin et al, 1977;Wei et al, 2015;Xi et al, 2015b).…”

Section: Formation Of Carbonate Cementmentioning

confidence: 99%

“…The Upper Triassic Xujiahe Formation has become an essential tight gas unit over the last five decades of tight gas exploration and exploitation of the Western Sichuan Basin (Wang, Huang, Gong, Wu, & Yu, 2013). Numerous studies have been conducted on the diagenetic facies, porosity evolution, tectonic evolution, natural fractures, and sedimentary environment of the Xujiahe Formation Liu et al, 2018;Luo et al, 2019;Qin, Zhang, Zhao, & Zhou, 2018;Wu et al, 2020;Yu et al, 2017;Yu et al, 2019;Yue et al, 2018). However, the previous understanding of the Xujiahe Formation is mainly limited to the Xu4 member rather than the Xu2 sandstones.…”

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Diagenesis and reservoir quality of the second member of the Upper Triassic Xujiahe Formation tight gas sandstones in the Western Sichuan Depression, southwest China

et al. 2021

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The tight sandstones reservoir of the second member of the Xujiahe Formation (Xu2 member) is gradually becoming the main reservoir for natural gas exploration and exploitation in the Western Sichuan Basin. The tight sandstone is normally deeply buried, where it is controlled by complex diagenetic processes. To gain insights into reservoir exploration of the Xu2 member, the diagenetic history and the impacts of diagenesis on reservoir quality were established using several experimental methods.The sandstones were found to be mainly litharenite, sublitharenite, and feldspathic litharenite. The reservoir quality was characterized by low porosity (3.4% on average), low permeability (0.17 mD on average), low pore throat radius, and high displacement pressure. The tight sandstones experienced a series of significant diagenetic processes, including mechanical compaction, early dissolution, and precipitation of carbonate and siliceous cements during eodiagenesis. They also underwent chemical compaction, late dissolution, and transformation of clay minerals during mesodiagenesis. The silica cementation mainly resulted from chemical compaction, feldspar dissolution, and the transformation of clay minerals. A higher degree of compaction has a vital role in destroying most of the primary pores. Cementation had a significant impact on reducing the porosity and permeability, although chlorite preserved primary pores by slowing the compaction. This study aimed to provide a comprehensive insight into diagenesis and its impact on the reservoir quality of deeply buried sandstone, and provide insights into reservoir exploration and development in deeply buried tight sandstones.

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“…The absence of early calcite cement, as well as large amounts of feldspar dissolution and quartz cementation, has been typical characteristics of tight sandstones in coal-bearing strata (Hou et al, 2020;Yu et al, 2019), where the impact of texture and detrital composition on reservoir quality can be very different. Previous studies have paid much attention on how coal evolution affects diagenetic process of sandstones, while the impact of petrographic characteristics on reservoir quality during the process is not well understood.…”

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confidence: 99%

Impact of petrographic characteristics on reservoir quality of tight sandstone reservoirs in coal‐bearing strata: A case study in Lower Permian Shihezi Formation in northern Ordos Basin, China

Liu

et al. 2021

Geological Journal

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The lower Shihezi Formation in the Sulige gas field is the main gas exploitation target in the Ordos Basin and is crucial in finding high-quality reservoirs for further exploration.Using X-ray diffraction, cathodoluminescence (CL), and scanning electron microscope (SEM) techniques, the eighth member of lower Shihezi Formation (He8) sandstones are characterized as fine-to coarse-grained quartzarenite and litharenite with good sorting, which are controlled by different sources and depositional faces. Four types of sandstones are recognized according to varied petrographic characteristics, among which fine-grained sandstones (type I) has the poorest reservoir quality and coarse-grained sandstones with chlorite coating (type II) are the best reservoirs. The complicated diagenetic process mainly includes intense compaction, two-stage dissolution, quartz and calcite cementation, which is closely associated with the thermal evolution of coals. The increased ductile fragments account for low reservoir quality in type I sandstones. Due to the absence of feldspar, the influence of other detrital components on the reservoir quality has increased. Sandstones with abundant volcanic fragments (type II) usually formed grain-coating chlorite, which inhibit tight compaction and quartz cementations.Quartz overgrowth originated from feldspar dissolution as well as pressure dissolution of detrital quartz are frequently observed in medium-to coarse-grained quartzarenite (type III). The high-quality reservoir exits when the ductile grains content is about 4%, according to the negative relationship between quartz cement and ductile content.Although there are a lot of dissolution pores in medium-to coarse-grained litharenite (type IV), the reservoir quality did not improve much due to the diagenetic minerals filling in the secondary pores. K E Y W O R D S coal-bearing strata, diagenesis, Ordos Basin, petrographic characteristics, quartz cementation, tight gas reservoir 1 | INTRODUCTION Tight sandstone reservoirs in coal-bearing strata are gradually receiving much interest because of their large hydrocarbon reserves worldwide (Zou et al., 2012). In China, the production of gas in coal buried strata has reached 902 × 10 8 m 3 , accounting for 61.5% of the total production (Zou et al., 2019). Therefore, it is very significant to focus on factors affecting production in coal buried tight sandstones.

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Impacts of lithologic characteristics and diagenesis on reservoir quality of the 4th member of the Upper Triassic Xujiahe Formation tight gas sandstones in the western Sichuan Basin, southwest China

Cited by 35 publications

References 35 publications

Water-flooding characteristics of lithologic reservoir in Ordos basin

Water-flooding characteristics of lithologic reservoir in Ordos basin

Diagenesis and reservoir quality of the second member of the Upper Triassic Xujiahe Formation tight gas sandstones in the Western Sichuan Depression, southwest China

Impact of petrographic characteristics on reservoir quality of tight sandstone reservoirs in coal‐bearing strata: A case study in Lower Permian Shihezi Formation in northern Ordos Basin, China

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