Accumulation condition and favorable area evaluation of shale gas from the Niutitang Formation in northern Guizhou, South China

Li, Xianqing; Wang, Yuan; Guo, Man; Wang, Zhe; Wang, Feiyu

doi:10.1016/j.jnggs.2018.03.001

Cited by 22 publications

(12 citation statements)

References 20 publications

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“…11,13 The Cengong Block is considered as a relatively favorable area for shale gas accumulation of the Lower Cambrian Niutitang Formation in northern Guizhou, but it is important to note that the organic matter has a high thermal maturity despite the advantageous shale gas geological conditions, 24 and the results of this study are consistent with those made previously. 11,13 The Cengong Block is considered as a relatively favorable area for shale gas accumulation of the Lower Cambrian Niutitang Formation in northern Guizhou, but it is important to note that the organic matter has a high thermal maturity despite the advantageous shale gas geological conditions, 24 and the results of this study are consistent with those made previously.…”

Section: Marine Shale Gassupporting

confidence: 90%

“…21,22 The preservation conditions might also be a crucial factor for the shale gas evaluation in structurally complex regions, 22 and the tight shales that form the direct seals and Lower Middle Triassic gypsum layers and mudstone that form regional seals with low TOC and porosity maintain the high gas content of the first member shale of the Longmaxi Formation, as well as overpressure systems in the Sichuan Basin. 24 Furthermore, there are a good number of quantitative approaches, for instance, the fuzzy evaluation method, fuzzy similarity method, and TOPSIS method, which can be used in the field of hydrocarbon evaluation. 24 Furthermore, there are a good number of quantitative approaches, for instance, the fuzzy evaluation method, fuzzy similarity method, and TOPSIS method, which can be used in the field of hydrocarbon evaluation.…”

mentioning

confidence: 99%

“…23 Integrated evaluation maps prepared by the stacking method are widely used in delineating the distribution of favorable areas in a specific region. 24 Furthermore, there are a good number of quantitative approaches, for instance, the fuzzy evaluation method, fuzzy similarity method, and TOPSIS method, which can be used in the field of hydrocarbon evaluation. [25][26][27][28] Actually, the selection of favorable shale gas areas can be abstracted mathematically as the multi-index decision, and these approaches, in principle, can be used to serve for the target.…”

mentioning

confidence: 99%

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Approaches for the evaluation of favorable shale gas areas and applications: Implications for China's exploration strategy

Zhang

Tang

et al. 2019

Energy Science & Engineering

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To explore practical approaches for the evaluation of favorable shale gas areas, a structural decomposition analysis with respect to the index system, evaluation criteria, weight determination, and evaluation methods was carried out. Five types of indexes were determined from 25 subindexes that formed the index system, and improved whitenization weight functions are proposed to establish evaluation criteria. The index weights calculated using entropy weight and Euclidean distance methods are consistent, whereas the weights determined by gray relational analysis are significantly affected by the relative number of indexes and evaluation objects, selected mother factor, and resolution coefficient. The significant linear positive correlation between the relative approach degree values calculated using TOPSIS and the scores obtained using fuzzy comprehensive evaluation (FCE) is indicative of a consistent evaluation result, but it should be noted that extreme indicator values can have strong effects on the evaluation using the fuzzy similarity method. Finally, an exploration strategy for China's shale gas is suggested: Areas with weak reformation and relatively low maturity are expected to be favorable for marine shale production in South China, and continental and transitional shale‐bearing basins are promising for the prospecting multiple‐origin shale gas and coal measure gas, respectively.

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Section: Marine Shale Gassupporting

confidence: 90%

mentioning

confidence: 99%

mentioning

confidence: 99%

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Approaches for the evaluation of favorable shale gas areas and applications: Implications for China's exploration strategy

Zhang

Tang

et al. 2019

Energy Science & Engineering

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“…Black shale series were widely deposited during the Upper Sinian and Lower Cambrian periods. The NTT shales are located in the lower part of the NTT formation and its dominant lithologies include a silty shale and a carbonaceous shale, intercalating by stone coal, silicolite, and phosphorite . Previous studies have shown that it contains kerogens of Type I and Type II with a relatively strong hydrocarbon generation potential…”

Section: Methodsmentioning

confidence: 99%

“…The NTT shales are located in the lower part of the NTT formation and its dominant lithologies include a silty shale and a carbonaceous shale, intercalating by stone coal, silicolite, and phosphorite. 29 Previous studies have shown that it contains kerogens of Type I and Type II with a relatively strong hydrocarbon generation potential. 30 The upper Ordovician-lower Silurian LMX formation is basically distributed in north part of Guizhou Province, close to the Sichuan Basin.…”

Section: Geological Backgroundmentioning

confidence: 99%

Adsorption characteristics of clay‐organic complexes and their role in shale gas resource evaluation

Mao

Zhang

Pei

et al. 2018

Energy Science & Engineering

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Adsorbed gas can share a significant portion of total gas content in shale reservoirs. At the same time, the adsorption characteristics of clay‐organic complexes which commonly exist in reservoir formations differ from other lithologies. To better understand the effect of adsorption characteristics of clay‐organic complexes on shale gas storage mechanism and estimation of resources, clay‐organic complexes were extracted from original core samples obtained from shales of Niutitang (NTT) and Longmaxi (LMX) formations in the northern Guizhou region, China. Petrophysical and adsorption experiments were performed and results show that the adsorbability of the clay‐organic complexes is obviously higher than regular shales in the reservoir. Therefore, the gas contents calculated based on the adsorbability of clay‐organic complexes are higher by 30%‐70% than that based on regular shales. Combined with other measured petrophysical properties, the NTT and LMX shales display a promising potential for further exploration and development. The clay‐organic complexes may accumulate in certain areas in the reservoir, and these accumulated areas could form the “sweet spots” for shale gas development. Methodologies and results presented in this study are beneficial in more accurately understanding gas storage mechanism, estimating gas resources and identifying sweet spots in shale reservoirs.

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Early Cambrian highly metalliferous black shale in South China: Cu and Zn isotopes and a short review of other non-traditional stable isotopes

et al. 2022

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Early Cambrian black shales on the Yangtze Platform host a regionally distributed highly metalliferous sulfide-rich carbonaceous unit which has been the subject of extensive debate. This marker unit, with a few centimeters or tens of centimeters in thickness, displays extreme enrichment in Mo and Ni (wt% range), and in a broad spectrum of other metals such as As, Au, PGE, Re, Cu, Zn, Cd, Ag, Sb, Se, Tl, and Hg, and occurs discontinuously along the western passive margin of the Yangtze Platform. It grades laterally in stratigraphically equivalent meter-thick vanadium-rich shale and tens-of-meter-thick sapropelite (combustible shale). New Cu and Zn isotope data, combined with existing Cd, Cr, Ni, Mo, Hg, and Se isotope and other chemical data, allow to attempt an integrated view on the formation of this intriguing unit of hyper-enriched metalliferous black shale. The authigenic Cu enrichment in the 1000-ppm range has produced no or little Cu isotope fractionation (0.03 ± 0.26 ‰ δ65Cu) beyond the lithogenic background. Heavy zinc and cadmium isotope enrichment in the sulfidic samples (1.11 ± 0.18 ‰ δ66Zn, 0.31 ± 0.10 ‰ δ114Cd) is controlled by sulfide fractionation and contrasts with V-rich and barren shale (0.60 ± 0.18 ‰ δ66Zn, 0.00 ± 0.14 ‰ δ114Cd). The distinctly negative Ni isotope composition of the metalliferous unit (−0.84 ± 0.05 ‰ δ60Ni) with Ni in the percent range has been interpreted as due to hydrothermal activity related to the leaching of mafic rocks and their sulfides. Sorption processes (Fe-oxyhydroxides) and redox cycling in the water column and the bottom sediment with microbial activity could be an alternative interpretation. The extreme metal enrichment can be understood as due to a process chain, from high biological productivity in the oxic photic zone to sulfate reduction in the deeper sulfidic water column and upper sediment layer. Key to the metal enrichment seems to be extremely low clastic sedimentation and advanced carbon destruction by anaerobic oxidation. Hydrothermal input of basinal brines along the rifted margin of the Yangtze Platform was likely a part of this scenario.

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Accumulation condition and favorable area evaluation of shale gas from the Niutitang Formation in northern Guizhou, South China

Cited by 22 publications

References 20 publications

Approaches for the evaluation of favorable shale gas areas and applications: Implications for China's exploration strategy

Approaches for the evaluation of favorable shale gas areas and applications: Implications for China's exploration strategy

Adsorption characteristics of clay‐organic complexes and their role in shale gas resource evaluation

Early Cambrian highly metalliferous black shale in South China: Cu and Zn isotopes and a short review of other non-traditional stable isotopes

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