Formation and enrichment mode of Jiaoshiba shale gas field, Sichuan Basin

Guo, Tonglou; Zhang, Hanrong

doi:10.1016/s1876-3804(14)60003-3

Cited by 471 publications

(264 citation statements)

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“…During the experimental process, for the purpose of reducing their testing errors, although the graptolite and bitumen can be distinguished based on the difference between their shapes, the anisotropy of optical property in graptolite will certainly affect their test results [13]. In addition, the samples used in the study are limited, which in an important factor affecting the test results, therefore there exist certain limitations in maturation of the reflected source rocks.…”

Section: The Results and Application Of Reflectance Measurement Of Micmentioning

confidence: 99%

Application and Research on Macroscopic Identification of Bitumen and Graptolite in Shale and Reflectance Detection

Jun¹,

He²,

Che³

et al. 2018

OJOGas

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Longmaxi Formation of Lower Palaeozoic Silurian System in Northwest of Guizhou Province is an import target layer of shale gas exploration; the study of its organic matter maturity is a necessary indicator for evaluating the resources of shale gas. Because the Longmaxi shale does not contain any vitrinite; its thermal evolution must be tested by the shale asphalt reflectance and the graptolite reflectance. The DM4500 microscope is used to test the shale of Graptolite reflectance and asphalt reflectance. The results show that the shale graptolite reflectance is between 2.91% -3.20%, average 3.08%; asphalt fragments reflectivity is between 2.93% -3.19%, average 2.94%; amorphous bitumen reflectance is between 2.89% -3.18%, average 2.89%. Graptolite reflectance is slightly higher than the reflectance of asphalt. The average of equivalent vitrinite reflectance is 2.06%; the equivalent vitrinite reflectance of asphalt debris is 2.20%, indicating that the shale of Northwest Guizhou Silurian Longmaxi has been in high-over mature stage of thermal evolution. The result of study provides a reliable parameter for the evaluation of shale gas resources in the area, and also shows the applicability of the evaluation of bitumen and graptolite reflectance of the maturity of organic matter of shale gas in the Silurian System.

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Section: The Results and Application Of Reflectance Measurement Of Micmentioning

confidence: 99%

Application and Research on Macroscopic Identification of Bitumen and Graptolite in Shale and Reflectance Detection

Jun¹,

He²,

Che³

et al. 2018

OJOGas

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“…The average gas content of the Lower Cambrian and Lower Silurian shales from the Weiyuan Block is 1.9 and 1.82 m 3 /t, respectively (Huang et al 2012a, b). For the Changning and Jiaoshiba blocks, the average gas content of the Lower Silurian shales is 1.93 and 2.96 m 3 /t, respectively (Huang et al 2012a;Guo and Zhang 2014). The gas content from the three blocks is similar to that of the Marcellus Shale and has a linear positive correlation with their TOC contents (Guo 2014;Wang et al 2012a;Wang et al 2013c).…”

Section: Gas Content Of Shale With a Very High Maturitymentioning

confidence: 99%

“…Most of the area outside the Sichuan Basin underwent faulting and folding (Deng et al 2009;Ma et al 2006;Wang et al 2013b;). Similar to coal bed methane in China, the preservation of the Lower Paleozoic shale gas is mainly controlled by the intensity and pattern of the tectonic deformation (Guo and Zhang 2014;Guo 2014;Hu et al 2014;Song et al 2005Song et al , 2009). The tectonic deformation can be largely divided into two patterns.…”

Section: Tectonic Deformation and Gas Content Of Shalementioning

confidence: 99%

“…Industrial shale gas production has been achieved from some areas, such as the Weiyuan, Changning, and Fuling blocks (Huang et al 2012a, b;Guo and Liu 2013;Li et al 2014;Wang et al 2013c;Wang 2013). Especially in the Jiaoshiba area of the Fuling Block, initial gas production of (10-50) 9 10 4 m 3 /d has been reported for most tested wells, and the average yield of well JY1 in the first year was 6 9 10 4 m 3 /d (Guo and Zhang 2014). The Jiaoshiba area is planned to the first commercial development demonstration base for shale gas in China.…”

Section: Introductionmentioning

confidence: 99%

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Main controlling factors and enrichment area evaluation of shale gas of the Lower Paleozoic marine strata in south China

et al. 2015

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The Lower Paleozoic shale in south China has a very high maturity and experienced strong tectonic deformation. This character is quite different from the North America shale and has inhibited the shale gas evaluation and exploration in this area. The present paper reports a comprehensive investigation of maturity, reservoir properties, fluid pressure, gas content, preservation conditions, and other relevant aspects of the Lower Paleozoic shale from the Sichuan Basin and its surrounding areas. It is found that within the main maturity range (2.5 % \ EqR o \ 3.5 %) of the shale, its porosity develops well, having a positive correlation with the TOC content, and its gas content is controlled mainly by the preservation conditions related to the tectonic deformation, but shale with a super high maturity (EqR o [ 3.5 %) is considered a high risk for shale gas exploration. Taking the southern area of the Sichuan Basin and the southeastern area of Chongqing as examples of uplifted/folded and faulted/folded areas, respectively, geological models of shale gas content and loss were proposed. For the uplifted/folded area with a simple tectonic deformation, the shale system (with a depth [ 2000 m) has largely retained overpressure during uplifting without a great loss of gas, and an industrial shale gas potential is generally possible. However, for the faulted/folded area with a strong tectonic deformation, the sealing condition of the shale system was usually destroyed to a certain degree with a great loss of free gas, which decreased the pressure coefficient and resulted in a low production capacity. It is predicted that the deeply buried shale ([3000 m) has a greater gas potential and will become the focus for further exploration and development in most of the south China region (outside the Sichuan Basin).

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“…Commercial production of shale gas from the Silurian Longmaxi Formation in the southeastern foldbelt (east of Chongqing, fig. 1) has been ongoing since late 2012 (Guo and Zhang, 2014;Guo, 2015).…”

Section: Introductionmentioning

confidence: 99%