Diagenesis and reservoir characteristics analysis of the Late Triassic Xujiahe Formation tight gas sandstone in the northern Sichuan Basin, China

Yu, Yu; Lin, Liangbiao; Zhai, Changbo; Wang, Yanan; Li, Yehan; Guo, Yan

doi:10.1177/0144598717745778

Cited by 8 publications

(4 citation statements)

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“…Paleogeomorphological maps indicate that future exploration should focus on monadnocks. Yu et al (2018) use thin section, SEM, XRD, porosity, and permeability analyses to determine the diagenetic processes and reservoir characteristics of the Late Triassic continental Xujiahe Formation tight gas sandstone of the northern Sichuan Basin. The Xujiahe sandstone comprises feldspathic litharenite, litharenite, sublitharenite, and quartzarenite, and yields low porosities (0.79-10.43%; mean ¼ 4.55%) and permeabilities (0.0021-26.001 mD; mean ¼ 0.449 mD).…”

Section: Formation Of Natural Gas Reservoirs In the Sichuan Basinmentioning

confidence: 99%

Special Issue: Advances of petroleum exploration and geology research in West China's petroliferous basins

Cao

Wang

2018

Energy Exploration & Exploitation

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Section: Formation Of Natural Gas Reservoirs In the Sichuan Basinmentioning

confidence: 99%

Special Issue: Advances of petroleum exploration and geology research in West China's petroliferous basins

Cao

Wang

2018

Energy Exploration & Exploitation

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“…With the increasing demand for hydrocarbon resources, a series of surveys and explorations have been conducted in the Turpan–Hami Basin. As a result, new understandings and findings of the Wutonggou formation in the Yingyeer area have been gradually obtained, and increasing attention has been paid to special hydrocarbon reservoirs such as tight and conglomeratic reservoirs (Liu et al, 2022; Yu et al, 2018). Conglomeratic reservoirs, whose physical properties are significantly affected by diagenesis, have gradually become a new area of interest for hydrocarbon exploration (Zan et al, 2011; Zhang et al, 2014; Zhou et al, 2021).…”

Section: Introductionmentioning

confidence: 99%

The diagenesis and evolution of conglomeratic reservoirs in the Wutonggou Formation in the Yingyeer area

Wei

Wang

Guo

et al. 2023

Energy Exploration & Exploitation

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The conglomeratic reservoirs of the Permian Wutonggou Formation in the Yingyeer area of the Turpan–Hami Basin are key petroliferous horizons, with enormous potential for hydrocarbon exploration. Existing studies on the conglomeratic reservoirs in this area mainly focus on the sedimentary environment and sand body distribution, while few of them concern the diagenesis and evolution of the conglomeratic reservoirs, leading to deficient knowledge about relevant mechanisms. By comprehensively utilizing the data from ordinary and casting thin section identification, the x-ray diffraction analysis of whole rock and clay, scanning electron microscopy, and other analyses and assays, this study analyzed and investigated the petrological characteristics, diagenetic types, and characteristics, and diagenetic evolutionary stages and mechanisms of the conglomeratic reservoirs of the Permian Wutonggou Formation in the Yingyeer area. The study results are as follows. Under the influence of sedimentary provenances, tectonic evolution, and paleogeomorphology, the conglomeratic reservoirs of the Permian Wutonggou formation have low clastic grain maturity and low structural maturity, suggesting proximal provenances. The reservoirs are subjected to various diagenesis, including carbonate cementation, which fills pores and throats; compaction as a major factor leading to poor reservoir quality, and dissolution, which significantly improves the reservoir properties. The conglomeratic reservoirs in the Wutonggou formation are generally in substage A of the middle diagenetic stage. The diagenetic evolution of the reservoirs generally underwent early mechanical compaction, calcite precipitation, secondary quartz overgrowth, the injection of organic fluids, the dissolution of feldspars and lithic grains, the transformation of clay minerals, and calcite cementation in sequence. Hydrocarbon charging mainly occurred during the late Middle Jurassic and was greatly influenced by early compaction and dissolution.

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“…Generally, the initial sedimentary environment is the fundamental factor for reservoir quality. The subsequent diagenetic modification has an important effect on the porosity and permeability (Lai et al, 2017, b;Quasim, Ghosh, & Ahmad, 2018;Rahman & Worden, 2016;Yu et al, 2017;Zhou et al, 2016;Zou et al, 2012). Diagenesis consists of mechanical compaction, geochemical effects of dissolution and precipitation, and biological effects (Ahmad, Ahmad, & Quasim, 2017;Bjørlykke & Jahren, 2012;Higgs, Zwingmann, Reyes, & Funnell, 2007;Taylor et al, 2010).…”

mentioning

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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confidence: 99%

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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Diagenesis and reservoir characteristics analysis of the Late Triassic Xujiahe Formation tight gas sandstone in the northern Sichuan Basin, China

Cited by 8 publications

References 39 publications

Special Issue: Advances of petroleum exploration and geology research in West China's petroliferous basins

Special Issue: Advances of petroleum exploration and geology research in West China's petroliferous basins

The diagenesis and evolution of conglomeratic reservoirs in the Wutonggou Formation in the Yingyeer area

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

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