Stable carbon isotopes of alkane gases from the Xujiahe coal measures and implication for gas-source correlation in the Sichuan Basin, SW China

Dai, Jianhua; Ni, Yunyan; Zou, Caineng; Tao, Shizhen; Hu, Guoyi; Hu, Anping; Yang, Chun; Tao, Xiaowan

doi:10.1016/j.orggeochem.2009.01.012

Cited by 105 publications

(69 citation statements)

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“…The δ 13 C values of the CMVs ranging from −23.4 to −26.4‰ fall well into the δ 13 C value range of the CMs in the Late Triassic Xujiahe Formation, about −24 to −27‰ (Dai et al, 2009). The later data are determined from type II and III kerogen collected from the dark mudstones of the Xujiahe Formation in the northwest and central Sichuan Basin, which is a stable tectonic region (Dai et al 2009).…”

Section: Origin Of Cms For the Cmvssupporting

confidence: 67%

“…The later data are determined from type II and III kerogen collected from the dark mudstones of the Xujiahe Formation in the northwest and central Sichuan Basin, which is a stable tectonic region (Dai et al 2009). …”

Section: Origin Of Cms For the Cmvsmentioning

confidence: 99%

“…The lithology of the WFSD-1 cores from 585.75 (the fault plane of the YBF) to 759-m depth is mainly gray sandstone, dark-gray siltstone, carbon shale, and coal lines, corresponding to the third section of the Xujiahe Formation (Li et al 2013), while the total organic carbon (TOC) of the third section is up to 9.7 % (Dai et al 2009). In other words, the trench we studied is localized in the carbon-rich section of the Xujiahe Formation.…”

Section: Origin Of Cms For the Cmvsmentioning

confidence: 99%

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Origin and formation of carbonaceous material veins in the 2008 Wenchuan earthquake fault zone

Jiang

Zhang

et al. 2016

Earth Planet Sp

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This paper establishes a reference data set of carbonaceous materials (CMs) from the active fault zone of the Longmen Shan fault belt that ruptured in the 2008 Mw7.9 Wenchuan earthquake and presents an application of these data for studies of both other exhumed carbonaceous-rich fault zones and deep-drilling cores. The CMs distributed in the active fault zone are found as narrow veins and located along the slip surfaces. Microstructural observation shows that the carbonaceous material veins (CMVs) are located along slip surfaces in the fault gouge zones. Some CMVs have a cataclastic fabric, and their branches intrude into voids around the slip surfaces. Raman spectra of the CMVs show a wide (full width at half maximum >200 cm −1 ) D-peak at~1345 cm −1 (defect peak), which is much lower than the O-peak at~1595 cm −1 (ordered peak), indicating a metamorphic temperature of zeolite facies or lower than 250°C. In addition, the stable carbon isotopic compositions (δ 13 C values) of the CMVs, ranging from −23.4 to −26.4‰, are very similar to that of the kerogen collected from the Late Triassic Xujiahe Formation in Sichuan Basin. Given the data at which it may be formed, the Xujiahe Formation is the most likely origin of CMs for the CMVs, and it seems that some CMVs in the fault zone were crushed and intruded into the voids during coseismic events, possibly driven by an enhanced pore fluid pressure. Since graphitization is suggested as an indicator of transient frictional heating in this area, our study providing a reference data set of CMs would help future CM-rich fault-zone research to retrieve seismic signatures presumably occurring in the Longmen Shan fault zone belt.

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Section: Origin Of Cms For the Cmvssupporting

confidence: 67%

Section: Origin Of Cms For the Cmvsmentioning

confidence: 99%

Section: Origin Of Cms For the Cmvsmentioning

confidence: 99%

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Origin and formation of carbonaceous material veins in the 2008 Wenchuan earthquake fault zone

Jiang

Zhang

et al. 2016

Earth Planet Sp

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“…Therefore, the partial reversal of carbon isotopic series of Jurassic alkane gas in Northwest gas district was inherited from the coal-formed gas in Xujiahe Formation. Since the study by Dai et al (2009a) indicated that the origin of partially reversed alkane δ 13 C values of coal-formed gas in Xujiahe Formation was mixing of gases from the same source rocks of varying maturity, and the natural gas in Northwestern Sichuan area was characterized by multistage hydrocarbon accumulation 2007b), the partial reversal of carbon isotopic series of Jurassic alkane gas in Northwestern Sichuan area was caused by mixing of gases from the same source rocks of varying maturity. Zhu et al, 2006;Qin et al, 2007a;Fan, 2003;Fan et al, 2005;Yin, 2000;Shen et al, 2008;Zhang et al, 1999;Tian et al, 2009;Han et al, 1990;Xiao et al, 2008;Dai, 2009a;Zhou, 1992;Dai et al, 2004 ).…”

Section: Carbon Isotopic Characteristics Of Coal-formed Alkanesmentioning

confidence: 99%

“…Sichuan Basin is an important oil-and gas-bearing region in China, and the layers of gas fields (reservoirs) range from Sinian to Jurassic (Wang, 1994;Dai et al, 2009a).…”

Section: Introductionmentioning

confidence: 99%

Carbon Isotopic Characteristics of Jurassic Alkane Gases in the Sichuan Basin, China

Huang

Liao

et al. 2010

Energy Exploration & Exploitation

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There are plentiful natural gas resources in Jurassic in the Sichuan basin, where a lot of gas fields (reservoirs) have been discovered, and the natural gas is mainly alkane gas. Comprehensive study on carbon isotopic characteristics indicated that Jurassic alkane gas in Sichuan Basin can be divided into two types, coal-formed gas and oil-type gas. As the majority of the natural gas, coalformed gas distributed in Central and Northwest gas districts and was mainly from the underlying coal-measure hydrocarbon source rocks in Xujiahe Formation. The carbon isotopic series were mainly normal, while a minority were reversed. The reversal ones in Northwest gas district were caused by mixing of gases from the same source rocks with different maturity, while those in Central gas district were caused by mixing of oil-type and coal-formed gases. Oil-type gas was only discovered in Bajiaochang gas field in Central oil and gas district, and derived from self-generation and self-accumulation in Lower Jurassic, with normal carbon isotopic series and without any reversal. Comprehensive analysis suggested that the carbon isotopic characteristics of Jurassic alkane gas were different according to different regions and layers. The δ 13 C 1 and δ 13C 2 values of Jurassic alkane gas in central area were significantly lower than those in northwestern area for the influence by oil-type gas generated from Lower Jurassic Ziliujing Formation.

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Diagenesis and reservoir quality in tight gas sandstones: The fourth member of the Upper Triassic Xujiahe Formation, Central Sichuan Basin, Southwest China

Lai

Wang

Cai³

et al. 2017

Geological Journal

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Mineralogical, petrographic, and geochemical analyses were performed to investigate the sandstone composition and texture, pore system, and diagenetic minerals of Upper Triassic sandstones in the Central Sichuan Basin, Southwest China. The results show that authigenic quartz, clay minerals, and carbonates are the main pore‐filling constituents. The pore systems consist of intergranular porosity, secondary porosity, microporosity, and microfractures. Loss of depositional porosity is greater due to compaction than to cementation. Eodiagenesis includes mechanical compaction, precipitation of early calcite cements, kaolinite, and smectite, and leaching of feldspars by meteoric water. Mesodiagenesis consists of compaction, framework grain dissolution, and subsequent precipitation of illite, quartz, and late carbonate cements. Six lithofacies were identified on the basis of petrographic analyses, namely, (a) argillaceous sandstones; (b) poorly sorted sandstones; (c) quartz‐cemented sandstones; (d) carbonate‐cemented sandstones; (e) clay‐mineral‐cemented sandstones, and (f) clean sandstones with abundant secondary porosity. The best reservoir‐quality rocks have high percentages of detrital quartz but low percentages of matrix, quartz, and carbonate cement. Differences in textural and compositional attributes of various lithofacies significantly affect porosity‐depth trends. The diagenetic evolution pathways and reservoir‐quality prediction models of various lithofacies are reconstructed by integrated petrographic data. This work provides insights into describing the different lithofacies by petrographic analysis and helps to investigate how detrital composition and texture influence the diagenesis and reservoir quality evolution in tight gas sandstones.

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Stable carbon isotopes of alkane gases from the Xujiahe coal measures and implication for gas-source correlation in the Sichuan Basin, SW China

Cited by 105 publications

References 10 publications

Origin and formation of carbonaceous material veins in the 2008 Wenchuan earthquake fault zone

Origin and formation of carbonaceous material veins in the 2008 Wenchuan earthquake fault zone

Carbon Isotopic Characteristics of Jurassic Alkane Gases in the Sichuan Basin, China

Diagenesis and reservoir quality in tight gas sandstones: The fourth member of the Upper Triassic Xujiahe Formation, Central Sichuan Basin, Southwest China

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