Shale oil occurring between salt intervals in the Dongpu Depression, Bohai Bay Basin, China

Wang, Min; Sherwood, Neil; Li, Zhongsheng; Lu, Shuangfang; Wang, Wenguang; AiHua, Huang; Peng, Jun; Lu, Kun

doi:10.1016/j.coal.2015.07.004

Cited by 88 publications

(72 citation statements)

References 30 publications

(33 reference statements)

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“…A comparison of quartz, carbonate, and clay content of shales. Averaged mineralogical data of Bakken shale (Chalmers et al, ; Wang, Sherwood, et al, ; Wang, Wilkins, et al, ) [Colour figure can be viewed at wileyonlinelibrary.com]…”

Section: Resultsmentioning

confidence: 99%

“…Meanwhile, there is no positive correlation between TOC and porosity of the Lucaogou Formation shale (Figure ), which further illustrates that the contribution of the organic porosity to the total porosity of the shale should be very small and cannot cause a significant increase in porosity. At the same time, the heterogeneity of the continental lacustrine shales is extremely strong, and the mineral composition of the shale formed during the same period can differ greatly (Wang, Sherwood, et al, ; Wang, Wilkins, et al, ); the differences in mineral composition may be one of the causes of the shale porosity differences (Chen et al, ). To clarify the factors that influenced the porosity of the P2l Formation shale, this study statistically compared the relation between the shale porosity and the main mineral content.…”

Section: Resultsmentioning

confidence: 99%

“…Oil‐bearing capacity is one of the most fundamental factors considered in investigating shale oil potential (Hakimi et al, ; Jarvie, , ; Li, Lu, et al, ; Li, Wang, et al, ). Generally, the stronger the oil‐bearing capacity of the shale, the higher the enrichment of the shale oil, leading to more favourable shale oil exploration (Lu et al, ; Wang, Sherwood, et al, ; Wang, Wilkins, et al, ). Shale's oil‐bearing capacity could be represented by the oil crossover effect; that is, an oil saturation index (OSI = S 1 × 100/TOC, in milligram/gram) exceeding 100 mg/g indicates presence of potential economically producible oil (Jarvie, ).…”

Section: Resultsmentioning

confidence: 99%

“…Shale oil refers to oil generated in “unconventional resources” that has been retained in fine‐grained sedimentary rocks (Jarvie, ). Over the past several years, large quantities of shale oil have been extracted from marine shale in USA (Jarvie, ); and China has also produced shale oil extracted from lacustrine shale (Wang, Sherwood, et al, ; Wang, Wilkins, et al, ). China is estimated to possess rich lacustrine shale oil resources (approximately 47.6 billion tons; Liu et al, ).…”

Section: Introductionmentioning

confidence: 99%

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Geochemical and geological characteristics of Permian Lucaogou Formation shale of the well Ji174, Jimusar Sag, Junggar Basin, China: Implications for shale oil exploration

Pang

Wang

et al. 2017

Geological Journal

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Abundant shale oil resources were recently found in the organic‐rich Permian Lucaogou (P2l) Formation shale, Jimusar Sag, Junggar Basin. Although some scholars have conducted some researches on the basic geochemical characteristics of the Lucaogou Formation shale, it is not enough to effectively guide the shale oil exploration in the area. This is because during the exploration process of shale oil, besides the basic geochemical characteristics of shale, its mineral composition, physical properties, and oil‐bearing characteristics are all very important evaluation parameters. To systematically evaluate the favourable shale oil exploration sections in the Lucaogou Formation, 265 pieces of shale cores were sampled from well Ji174 in this study. Besides the basic geochemical characteristics of the 265 pieces of cores, the mineralogical, petrophysical, and oil‐bearing characteristics were also analysed. Results show that the shale has abundant organic matter (average total organic carbon 3.51%, average petroleum generation potential 15.67 mg/g), dominated by Type II1 and Type II2 kerogen, and has entered the early‐mature to mature stage. The Upper Member of the Lucaogou Formation has relatively higher organic matter and organic matter type is relatively more oil prone compared to the Lower Member; however, organic matter thermal maturity is lower. The P2l Formation shale is characterized by high carbonate minerals and low clay minerals, and when considering mineralogical brittleness, both the Upper and Lower members are ideally fracturable in shale oil development. The P2l Formation shale has a wide porosity range (1.1–13.9%), and the Lower Member's porosity is slightly greater. The inversion of shale porosity in the P2l Formation is controlled by the differentiated mineral composition. The oil saturation index values of the Lower Member shale are significantly greater than the Upper Member shale. From the above, the Lower Member of the P2l Formation shale is ideally suited and has greater shale oil potential in the Jimusar Sag, Junggar Basin, especially in the depth intervals of 3,255–3,272, 3,282–3,298, and 3,317–3,334 m in the well Ji174.

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Geochemical and geological characteristics of Permian Lucaogou Formation shale of the well Ji174, Jimusar Sag, Junggar Basin, China: Implications for shale oil exploration

Pang

Wang

et al. 2017

Geological Journal

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“…Although a certain amount of progress had been made, large‐scale industrial production of shale gas has not yet begun in China because of delays in development and the need to determine particular geological issues. Most of the shale in the USA is marine deposits, whereas the main type in the Eastern and Northwestern China is continental deposits (Gao et al, ; T. Hu, Pang, Wang, & Jiang, ; T. Hu, Pang, Yu, Wang, & Pang, ; T. Hu, Pang, Wang, et al, ; W. H. Li, ; J. J. Li, Wang, et al, ; J. J. Li, Yin, et al, ; M. Wang, Sherwood, et al, ; M. Wang, Wilkins, et al, ; W. Wang, Xue, Tian, Wilkins, & Wang, ). Therefore, large differences exist between the geological and geochemical characteristics of the shale in both countries, and it is not possible for China to completely copy the exploration experiences associated with shale gas in the USA.…”

Section: Introductionmentioning

confidence: 99%

Geochemical and geological characteristics of the Jurassic continental black shale in the Southwestern Depression of Tarim Basin

Jiang

Liu

et al. 2018

Geological Journal

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Although Jurassic continental black shale within the Southwestern Depression of Tarim Basin (SDT) have received renewed attention during the past few years due to their potential to be prospected for shale gas, studies on shale characteristics remain rare. In this study, 31 black shale core samples were collected from a well (Buya‐1) drilled recently in the Hetian Sag of the southern SDT, and their geochemical, petrographical, mineralogical, petrophysical, and pore structural characteristics were determined through a series of tests. The results indicate that the black shale has high and variable total organic carbon (TOC) contents ranging between 0.1% and 17.0% (average 3.2%), is dominated by Type III kerogen (gas‐prone), and is in a mature to high‐mature stage. The shale is mainly composed of quartz, clay, and feldspar with mean contents of 40.0% (range = 15.0–72.0%), 51.0% (range = 25–77%), and 5.5% (range = 1–13.0%), respectively. The pore spaces are composed of primary pores, secondary pores, and microfractures. The mean sorbed gas content of the shale is approximately 2.4 m3/t, and the TOC is significantly positively and linearly correlated with the adsorbed gas capacity. The results show that the Jurassic continental shale in the SDT is very favourable for the formation of a large shale gas play, and the middle segment of the Jurassic shale is the most favourable target layer for shale gas exploration due to its greater gas generation capacity, higher mineralogical brittleness, larger gas storage space, and greater gas sorption capacity. This study is significant in guiding subsequent shale gas exploration and development in the Jurassic, SDT, and also is a reference for identifying favourable exploration targets of shale gas resource in other continental basins.

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Influence of geochemical features on the mechanical properties of organic matter in shale

Zhao

Zhang

et al. 2020

Preprint

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Organic matter is an important constituent in organic-rich shale, which influences the hydrocarbon generation, as well as the mechanical behavior, of shale reservoirs. The physical, chemical, and mechanical properties of organic matter depend on the source material and the thermal evolution process. Previous works attempted to investigate the impact of thermal maturation on the mechanical properties of organic matter. However, owing to the lack of maceral classification and the limitation of data volume during the mechanical measurement, no consistent trend has been identified. In this work, vitrinite reflectance test, scanning electron microscope observation, nanoindentation, and micro-Raman analysis were combined for geochemical and mechanical characterization. A total of 114 test areas were selected for testing, enhancing reliability of the test results. The Young's moduli of organic matter are from 3.57 to 8.32 GPa. With the same thermal maturity, inertinite has the highest Young's modulus, while the modulus of bitumen is the lowest. The Young's moduli of different organic types all increase with vitrinite reflectance. When vitrinite reflectance increases from 0.62% to 1.13%, the modulus of inertinite and vitrinite is increased by 57% and 78%, respectively. The indentation creep of different organic matter suggests that the stiffer organic type demonstrates less creep influence. In addition, with the increase of thermal maturity, the micro-Raman test results show a decrease of intensity ratio of D peak to G peak, indicating an increase of the ordered structure in organic matter. From the characterization results, it was found that organic type and thermal maturity reflect the diversity of the source material and the chemical structure change during the thermal evolution process, and together they influence the mechanical properties of organic matter.

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Shale oil occurring between salt intervals in the Dongpu Depression, Bohai Bay Basin, China

Cited by 88 publications

References 30 publications

Geochemical and geological characteristics of Permian Lucaogou Formation shale of the well Ji174, Jimusar Sag, Junggar Basin, China: Implications for shale oil exploration

Geochemical and geological characteristics of Permian Lucaogou Formation shale of the well Ji174, Jimusar Sag, Junggar Basin, China: Implications for shale oil exploration

Geochemical and geological characteristics of the Jurassic continental black shale in the Southwestern Depression of Tarim Basin

Influence of geochemical features on the mechanical properties of organic matter in shale

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