Controlling functions of hydrothermal activity to shale gas content-taking lower Cambrian in Xiuwu Basin as an example

Zhang, Kun; Jiang, Zhenxue; Yin, Li; Gao, Zhiye; Wang, Pengfei; Yan, Song; Jia, Chengzao; Liu, Weiwei; Liu, Tianlin; Xie, Xuelian; Li, Yirun

doi:10.1016/j.marpetgeo.2017.05.012

Cited by 45 publications

(39 citation statements)

References 35 publications

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“…There are nearly no hydrothermal activities during the depositional process of SQ5, and most are terrigenous clastic silicon. Previous researches shows that the hydrothermal activi-ties play important role for organic matter [37][38][39][40][41][42][43][44]. On the one hand, hydrothermal activities can carry nutritions which are advantageous to the growth of plankton and is beneficial to the improvement of the biological productivity.…”

Section: Discussionmentioning

confidence: 99%

“…The content of excess silicon can reflect the intensity of hydrothermal activity [41]. As shown in Figure 3, hydrothermal activity was widespread in the Early Cambrian in the Lower Yangtze area, and the hydrothermal activity in the Wangyinpu Formation is stronger than that in the Guanyintang Formation.…”

Section: Calculation Of Excess Silicon and Analysis Of Its Causementioning

confidence: 99%

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Division of shale sequences and prediction of the favorable shale gas intervals: an example of the Lower Cambrian of Yangtze Region in Xiuwu Basin

Zhang

Song

et al. 2019

Open Geosciences

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It is a common method to use sequence stratigraphic theory to identify favourable intervals in hydrocarbon exploration. The Lower Cambrian shale of Well Jiangye-1 in Yangtze Region in Xiuwu Basin was chosen as the research object. The content of excess silicon of siliceous minerals in shale was calculated quantitatively, and the concentration distribution of Al, Fe, Mn showed that the excess silicon is of hydrothermally origin and the shale deposited in an environment with hydrothermal activity. Using U/Th values in the study, combined with lithology and logging data, in order to divide sequences of the Lower Cambrian shale in Yangtze Region in Xiuwu Basin. The result shows that the shale of the Lower Cambrian shale is recognized as 1 2nd sequence (TST-RST, TST = Transgressive systems tract; RST = Regressive systems tract) and then further subdivided into 5 3rd sequences (SQ1-SQ5). During the deposition of SQ2 and SQ3, hydrothermal activity was active, and their excess silicon content was generally above 20%-30%. Rising sea level and active hydrothermal activity were beneficial for the enrichment of siliceous minerals and organic matter. Based on the comparison of the reservoir parameters, it tells that SQ2 and SQ3 have relatively higher content of TOC, higher content of brittle minerals (such as siliceous minerals, carbonate minerals and so on), larger effective porosity and higher content of gas, which make it as the most favourable intervals of the Lower Cambrian in Xiuwu Basin.

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Section: Discussionmentioning

confidence: 99%

Section: Calculation Of Excess Silicon and Analysis Of Its Causementioning

confidence: 99%

Division of shale sequences and prediction of the favorable shale gas intervals: an example of the Lower Cambrian of Yangtze Region in Xiuwu Basin

Zhang

Song

et al. 2019

Open Geosciences

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“…According to previous research [33,34,[66][67][68], well X is located in the southern part of the Lower Yangtze, which is described as a deep-water shelf controlled by a foreland basin in the Late Ordovician and Early Silurian. The southern part of the Lower Yangtze generally transformed from shallow-water shelf into onshore and ancient land northwestwards, while the Cathaysia plate in the south changed dramatically from shallow-water shelf into and ancient land [34,35,67,68]. The location of Well X is near the connection of the Cathaysia and the Yangtze plates ( Figure 1).…”

Section: Sedimentary and Stratigraphymentioning

confidence: 99%

“…Yuan et al [31] and Wang et al [32] used difference of elements accumulation in deposition processes, applying the indicators Ca/(Ca + Fe) and Ti/Al for the characterization of different sedimentary environments and changes in water depth. Zhang et al [33][34][35] proposed a sequence division method for shale by lithology, well logging, and outcrop data, using U/Th as the principle index, Ca/(Ca + Fe) and Ti/Al as supporting indices.…”

Section: Introductionmentioning

confidence: 99%

“…Holdaway and Clayton [61] defined no-terrigenous siliceous minerals as excess silicon, and proposed a quantitative calculation method. In addition, based on large amount of statistics, Wedepohl [62], Adachi et al [63], and Yamamoto [64] proposed an Al-Fe-Mn method to identify the genesis of excess silicon (hydrothermal or biologic origin) widely applied under pelagic settings [33][34][35]60,65]. All these techniques help to reveal the influence of sedimentary environments on organic matter enrichment.…”

Section: Introductionmentioning

confidence: 99%

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Effect of Hydrothermal Activity on Organic Matter Enrichment of Shale: A Case Study of the Upper Ordovician and the Lower Silurian in the Lower Yangtze, South China

et al. 2018

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The effect of organic matter on hydrocarbon potential, storage space, and gas content of shale is well-known. Additionally, present-day content of sedimentary organic matter in shale is controlled by depositional and preservation processes. Therefore, a study of the enrichment mechanisms of sedimentary organic matter provides a scientific basis for the determination of favorable areas of shale gas. In this study the Upper Ordovician Xinkailing Fm. and the first member of the Lower Silurian Lishuwo Fm. were examined. Stratigraphic sequences were identified through conventional logs and elemental capture spectrum data. Oxygen isotope analysis was applied to recover paleotemperature of seawater in the study area. The excess silicon content was calculated and the origin of the silica was determined by the Fe-Al-Mn ternary plot. The enrichment mechanism of organic matter was analyzed by two aspects: redox conditions and paleoproductivity. As a result, the stratigraphic interval was divided into two 3rd-order sequences. Through oxygen isotope, the paleotemperature of seawater was 62.7–79.2 °C, providing evidence of the development of hydrothermal activity. Analysis of excess siliceous minerals identified two siliceous mineral origins: terrigenous and hydrothermal. It also revealed an upwards decreasing tendency in hydrothermal activity intensity. Strong hydrothermal activity during the Late Ordovician, recognized as TST1, formed a weak-oxidizing to poor-oxygen environment with high paleoproductivity, which promoted organic matter enrichment. During the Late Ordovician to the Early Silurian, identified as RST1, TST2, and RST2, weakening hydrothermal activity caused the decline of paleoproductivity and increased oxidation of bottom waters, leading to a relative decrease of organic matter content in the shale. Therefore, favorable areas of shale gas accumulation in the Upper Ordovician and Lower Silurian are determined stratigraphically as the TST1, with a high total organic carbonate content. Geographically, the hydrothermally-active area near the plate connection of the Yangtze and the Cathaysian is most favorable.

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Re-evaluation of original carbonate mineralogy, an integration of petrographic and geochemical data, Southwestern margin of Neo-Tethys Ocean

Moosavizadeh

2022

Carbonates Evaporites

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Controlling functions of hydrothermal activity to shale gas content-taking lower Cambrian in Xiuwu Basin as an example

Cited by 45 publications

References 35 publications

Division of shale sequences and prediction of the favorable shale gas intervals: an example of the Lower Cambrian of Yangtze Region in Xiuwu Basin

Division of shale sequences and prediction of the favorable shale gas intervals: an example of the Lower Cambrian of Yangtze Region in Xiuwu Basin

Effect of Hydrothermal Activity on Organic Matter Enrichment of Shale: A Case Study of the Upper Ordovician and the Lower Silurian in the Lower Yangtze, South China

Re-evaluation of original carbonate mineralogy, an integration of petrographic and geochemical data, Southwestern margin of Neo-Tethys Ocean

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