Pore Characteristics of the Upper Carboniferous Taiyuan Shale in Liaohe Depression

Document Type: Research Paper

Authors

1 China University of Geosciences,Beijing; National Research and Development (Experimental) Center for Shale Gas, LangFang 065007, China

2 China University of Petroleum, Beijing, 102249, China; Research Institute of Petroleum Exploration and Development-LangFang, LangFang 065007, China; National Research and Development (Experimental) Center for Shale Gas, LangFang 065007, China

3 China University of Geosciences, Beijing 100083, China

4 Research Institute of Petroleum Exploration and Development-LangFang, LangFang 065007, China

Abstract

High pressure mercury, nitrogen adsorption, nano-CT, and scanning electron microscope with energy spectrum analysis were conducted on core shale samples for studying the characteristics of Taiyuan formation in the eastern uplift of Liaohe depression. The research results show that the shale gas reservoir pores are mainly open pores such as the wedge-shape pores and parallel-plate pores. By a genetic type, pores mainly include organic pore, pyrite crystal particle pore, illite intragranular pore, illite-smectite mixed layer intragranular pore, and feldspar dissolved pore. The micropore and mesopore play an important role in shale gas reservoir, and their surface area and pore volume are 9.56 m2/g, 0.0414 mL/g, 97.3%, and 68.8% respectively. The pores diameter presents a bimodal distribution with two main peaks at 43 nm and 6.35 μm. Based on the nano-CT, the porosity is 4.36% and the permeability is 204 nD. The brittle minerals played a supportive and protective role for the pores and controlled their spatial distribution.
 

Keywords


References

Jinchuan Z., Zhijun J., and Mingsheng Y., “Reservoiring Mechanism of Shale Gas and its Distribution,” Natural Gas Industry, 2004, 24(7), 15-18.

Caineng Z., Zhi Y., Guosheng Z., et al, “Conventional and Unconventional Petroleum “Orderly Accumulation”: Concept and Practical Significance,” Petroleum Exploration and Development, 2014, 41(1), 14-27.

Currtis J.B., “Fracture Shale-gas Systems,” AAPG Bulletin, 2002, 86(11), 1921-1928.

Loucks R. G., Reed R. M., Ruppel S. C., et al., “Spectrum of Pore Types and Networks in Mud Rocks and a Descriptive Classification for Matrix-related Mud Rocks Pores,” AAPG Bulletin, 2012, 96(6), 1071-1098.

Honglin L. and Hongyan W, “Adsorptivity and Influential Factors of Marine Shales in South China,” Natural Gas Industry, 2012, 32(9), 5–9.

Libo W., Kai J., Weite Z., et al., “Characteristics of Lower Cambrian Marine Black Shales and Evaluation of Shale gas Prospective Area in Qianbei Area, Upper Yangtze Region,” Acta Petrologica Sinica, 2013, 29(9), 3263–3278.

Boling P., Dazhong D., Songtao W., et al., “Microscopic Space Types of Lower Paleozoic Marine Shale in Southern Sichuan Basin,” Journal of China University of Petroleum (Edition of Natural Science), 2014, 38(4), 19–25.

Tong-lou G. and Ruo-bing L., “Implications from Marine Gas Exploration Breakthrough in Complicated Structural Area at High Thermal Stage: Taking Longmaxi Formation in Well JY1 as an Example,” Natural Gas Geoscience, 2013, 24(4), 643–651.

Zhigang W., “Breakthrough of Fuling Shale Gas Exploration and Development and its Inspiration,” Oil & Gas Geology, 2015, 36(2), 1–6.

Peng L and Liming J, “Reservoir Characteristics and Potential Evaluation of Continental Shale Gas,” Natural Gas Geoscience, 2013, 24(5), 1060–1068.

Xiangzeng W., Shengli G., and Chao G., “Geological Features of Mesozoic Continental Shale gas inSouth of Ordos Basin, NW China,” Petroleum Exploration and Development, 2014, 41(3), 294–304.

Guoheng L., Zhilong H, Zhenxue J., et al, “The Characteristics and Reservoir Significance of Lamina in Shale from Yanchang Formation of Ordos Basin,” Natural Gas Geoscience, 2015, 26(3), 408–417.

Wei Y., Guojun C., Chengfu L., et al., “Micropore Characteristics of the Organic Rich Shale in the 7th Member of the Yanchang Formation in the Southeast of Ordos Basin,” Natural Gas Geoscience, 2015, 26(3), 418–426.

Xiangzeng W., Jinqiao W., and Juntao Z., “Application of Fracturing Technology for Terrestrial Shale Gas Reservoirs,” Natural Gas Industry, 2014, 34(1), 64–67.

Xin-jing L., Su-yun H., and Cheng Ke-ming C., “Suggestions from the Development of Fractured Shale Gas in North America,” Petroleum Exploration and Development, 2007, 34(4), 392-400.

Xian-ming X., Zhi-guang S., Yan-ming Z., et al., “Summary of Shale Gas Research in North American and Revelations to Shale Gas Exploration of Lower Paleozoic Strata in China South Area” Journal of China Coal Society, 2013, 38(5), 721-727.

Ming-na G, Jin-chuan Z., Xiao-guang L., et al., “Gas-bearing Property Analysis on Upper Paleozoic Shale in Eastern Uplift of Liaohe Basin,” Fault-Block Oil Gas Field, 2012, 19(6), 722-726 (in Chinese with English abstract).

Ming-na G, Jin-chuan Z, Xiao-guang L., and et al., “Evaluation on Neopaleozoic Shale Gas Resource Potential in the Eastern Salient of the Liaohe Depression,” Natural Gas Industry, 2012, 32(9), 28-32.

Junli M., Xiaoguang L., Yansheng S., et al., “Shale Gas Accumulation Conditions of Eastern Region of Liaohe Depression,” Earth Science Frontiers, 2012, 19(5), 348-355.

Zhunlin R and Xiaoguang L., “Enrichment Condition of Lishugou Formation Shale Gas and Favorable Area Selection in Eastern Area of Liaohe,” Fault-block Oil & Gas Field, 2013, 20(6), 704-708.

Peng Y., “Application of Widely-covered Hydrocarbon Generation Concept to Hydrocarbon Accumulation in Eastern Uplift, Liaohe Depression,” Journal of Xi’an Shiyou University (Natural Science Edition), 2014, 29(4), 24-37.

Dazhong D., Caineng Z., Jianzhong L., et al., “Resource Potential, Exploration and Development Prospect of Shale Gas in the Whole World,” Geological Bulletin of China, 2011, 30

(2/3)

, 324-326.

Hongyan W., Yuzhang L., Dazhong D., et al., “Scientific Issues on Effective Development of Marine Shale Gas in Southern China,” Petroleum Exploration and Development, 2013, 40(5), 574-579.

 

Caineng Z., Dazhong D., Shejiao W., et al., “Geological Characteristics, Formation Mechanism and Resource Potential of Shale Gas in China,” Petroleum Exploration and Development, 2010, 37(6), 641-643.

 

Shujing J., Hui H., Qingping W., et al., “Scanning Electron Microscope Analysis of Porosity in Shale,” Journal of Chinese Electron Microscopy Society, 2012, 31(5), 432-436.

 

Gengshe Y. and Hui L., “Study on the Rock Damage Characteristics Based on the Technique of CT Image Processing,” Journal of China Coal Society, 2007, 32(5), 463-468.

 

Bin B., Rukai Z., Songtao W., et al, “Multi-scale Method of Nano(Micro)-CT Study on Microscopic Pore Structure of Tight Sandstone of Yanchang Formation, Ordos Basin,” Petroleum Exploration and Development, 2013, 40(3), 329-333.

 

Wang Jialu W., Jian G., and Li L., “Porosity Characteristics of Sandstone by X-ray CT Scanning System,” Acta Petrolei Sinica, 2009, 30(6), 887-893.

 

Xiaoxia S., Yuegang T., Wei L., et al., “Advanced Characterization of Seepage Pores in Deformed Coals Based on Micro-CT,” Journal of China Coal Society, 2013, 38(3), 435-440.

 

Haikuan N., Ruikang B., Peixian Z., et al., “Micro-types and Characteristics of Shale Reservoir of the Lower Paleozoic in Southeast Sichuan Basin, and their Effects on the Gas Content,” Earth Science Frontiers, 2014, 21(4), 331-343.

 

Boling P., Dazhong D., Chuang E., et al., “Favorable Reservoir Characteristics of the Longmaxi Shale in the Southern Sichuan Basin and their Influencing Factors,” Natural Gas Industry, 2013, 33(12), 41-47.

 

Caineng Z., Rukai Z., Bin B., et al., “First Discovery of Nano-pore Throat in Oil and Gas Reservoir in China and its Scientific Value,” Acta Petrologica Sinica, 2011, 27(6), 1857-1864.

 

Rouquerol J., Avnir D., Fairbridge C. W., et al., “Recommendations for the Characterization of Porous Solids,” Pure & Applied Chemistry, 1994, 66(8), 1739-1785.

 

Hui L., Shaohua W., Xiumin J., et al., “The Configuration Analysis of the Adsorption Isotherm of Nitrogen in Low Temperature with the Lignite Char Produced under Fast Pyrolysis,” Journal of China Coal Society, 2005, 30(4), 507-510.

 

Ping C. and Xiuyi T., “The Research on the Adsorption of Nitrogen in Low Temperature and Micro-pore Properties in Coal,” Journal of China Coal Society, 2001, 26(5), 552-556.

 

Ross D. J. and Bustin R. M., “Shale Gas Potential of the Lower Jurassic Gordondale Member, Northeastern British Columbia, Canada,” AAPG Bulletin, 2007, 55(1), 51-75.

 

Shuheng T. and Erping F., “Methane Adsorption Characteristics of Clay Minerals in Organic-rich Shales,” Journal of China Coal Society, 2014, 39(8), 1700-1706.

 

Feng Y., Zhengfu N., Detao K., et al., “Pore Structure of Shales from High Pressure Mercury Injection and Nitrogen Method,” Natural Gas Geoscience, 2013, 24(3), 450-455.

 

Jialu W., Jian G., and Li L., “Porosity Characteristics of Sandstone by X-ray CT Scanning System,” Acta Petrolei Sinica, 2009, 30(6), 887-893.

 

Nelson P H., “Pore-throat Sizes in Sandstones, Tight Sandstones, and Shales,” AAPG Bulletin, 2009, 93(3), 329-340.