Lithologic Reservoirs ›› 2025, Vol. 37 ›› Issue (5): 34-48.doi: 10.12108/yxyqc.20250504

• PETROLEUM EXPLORATION • Previous Articles    

Exploration potential of shale gas in Ordovician Wulalike Formation in the western margin of Ordos Basin

LU Jiang1,2,3,4, WANG Jian1,2,3, WU Nan1,2,3, LI Chengshan5, FENG Zifei6   

  1. 1. College of Geosciences, Yangtze University, Wuhan 430100, China;
    2. Hubei Key Laboratory of Complex Shale Oil and Gas Geology and Development in Southern China, Wuhan 430100, China;
    3. Hubei Engineering Research Center of Unconventional Petroleum Geology and Engineering, Wuhan 430100, China;
    4. Southern Marine Science and Engineering Guangdong Laboratory(Zhanjiang), Zhanjiang 524000, Guangdong, China;
    5. Changqing Oilfield Company, PetroChina, Xi'an 710018, China;
    6. GWDC Mud Logging Company, CNPC, Panjin 124010, Liaoning, China
  • Received:2025-05-14 Revised:2025-06-09 Published:2025-09-06

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Abstract: Combined with well logging data analysis，mineral composition testing，scanning electron microscopy analysis，thin section observation，pore permeability analysis，nitrogen adsorption testing，and methane adsorption testing，the research of petrological characteristics，physical properties，pore structure characteristics，gas potential，and gas-bearing properties of Ordovician Wulalike Formation shale reservoir in the western margin of Ordos Basin were conducted. The results show that：（1）Ordovician Wulalike Formation in the western margin of Ordos Basin is dominated by dark gray to gray black mud shale，these mud shales exhibit stable distribution and have a thickness of about 78.9 m. The mineral composition is mainly quartz，with a brittle mineral mass fraction of 70.98%-90.32% and a brittleness index of 50.03%-71.16%.（2）The porosity of shale reservoirs in the research area is generally less than 0.1%，and the permeability is generally less than 0.01 mD. The pore types are mainly fractures，nano-micron micropores，and intergranular dissolved pores. The microscopic pore volume is 0.016 27-0.033 73 cm3/g，mainly micropores and mesopores. （3）In the research area，main types of organic matter of Wulalike Formation shale are Type Ⅰ and Type Ⅱ1，and TOC can reach to 1.54%，the organic matter is in high maturity to over maturity stage，with a maximum methane adsorption mass volume of 0.99 m3/t under experimental conditions of 30 ℃. The highest shale gas mass volume in logging interpretation is 3.4 m3/t. Compared with typical high-quality shale reservoirs at home and abroad，its organic matter abundance is relatively low，the content of brittle minerals is relatively high，and the gas content is at a moderate level，indicating great potential for shale gas exploration.

Key words: shale gas, brittleness index, isothermal adsorption experiment, microscopic pore structure, high maturity to over maturity, Wulalike Formation, Ordovician, western margin of Ordos Basin

CLC Number: 

  • TE122
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