Lithologic Reservoirs ›› 2024, Vol. 36 ›› Issue (3): 31-39.doi: 10.12108/yxyqc.20240303

• PETROLEUM EXPLORATION • Previous Articles    

Low resistivity response characteristics and main controlling factors of shale gas reservoirs of Ordovician Wufeng Formation-Silurian Longmaxi Formation in Changning area，southern Sichuan Basin

CHENG Jing1,2, YAN Jianping1,2, SONG Dongjiang3, LIAO Maojie4, GUO Wei5, DING Minghai6, LUO Guangdong6, LIU Yanmei7   

  1. 1. School of Geoscience and Technology, Southwest Petroleum University, Chengdu 610500, China;
    2. National Key Laboratory of Oil and Gas Reservoir Geology and Exploitation(Southwest Petroleum University), Chengdu 610500, China;
    3. Shandong Ruilin Energy Technology Co., Ltd., Dongying 257000, Shandong, China;
    4. Research Institute of Shale Gas, PetroChina Southwest Oil & Gas Field Company, Chengdu 610500, China;
    5. PetroChina Research Institute of Petroleum Exploration and Development, Beijing 100083, China;
    6. Drilling Engineering Company, PetroChina Daqing Oilfield Company, Daqing 163712, Heilongjiang, China;
    7. Schlumberger Technology Service(Chengdu) Co., Ltd., Chengdu 610095, China
  • Received:2023-04-29 Revised:2023-06-24 Published:2024-04-30

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Abstract: Taking low resistivity shale gas reservoirs of Wufeng Formation-Longmaxi Formation of well NX22 in Changning area in southern Sichuan Basin as an example, the data of core mineral composition, scanning electron microscope, total organic carbon（TOC）content, water saturation test and logging curves were used to establish a rock volume physical model of low resistivity shale gas reservoirs. A three-dimensional digital core model was constructed by random method, and the resistivity response characteristics were simulated under different mineral components content, water saturation and organic matter graphitization by finite element numerical simulation method, and the main controlling factors were analyzed. The results show that:（1）The rock volume physical model of low resistivity shale gas reservoirs of Wufeng Formation-Longmaxi Formation in Chang-ning area consists of six parts:skeleton（quartz, feldspar, calcite and dolomite）, clay minerals, pyrite, ungraphitized organic matter, graphitized organic matter and pores.（2）The 3D digital core is of 100×100×100 pixels in length, width, and height, respectively. It integrates the six parts of the physical model mentioned above, and uses different colors to identify the conductive components. It can display slices in different directions to characterize the composition characteristics of low resistivity shale gas reservoirs.（3）An increase in clay mineral content, pyrite content, water saturation and organic matter graphitization degree can cause a decrease in the resistivity of shale gas reservoirs. However, the high degree of organic matter graphitization（25%）and high water saturation （88.0%）cause the resistivity of shale gas reservoirs to decrease from normal resistivity（greater than 15 Ω·m）to low or even ultra-low resistivity（less than 5 Ω·m）, which are the two core factors leading to the ultra-low resistivity response of shale gas reservoirs in the study area.

Key words: low resistivity, shale gas reservoir, digital core, finite element method, conductive factor, water saturation, organic matter graphitization degree, clay minerals, pyrite content, Ordovician Wufeng FormationSilurian Longmaxi Formation, Changning area in Sichaun Basin

CLC Number: 

  • TE348
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