Lithologic Reservoirs ›› 2022, Vol. 34 ›› Issue (1): 118-129.doi: 10.12108/yxyqc.20220112

• EXPLORATION TECHNOLOGY • Previous Articles     Next Articles

Logging identification method of lacustrine shale interlayers of Shahejie Formation in Zhanhua Sag

ZHAO Xiaoxiao1,2, YAN Jianping1,2,3, WANG Min4, HE Xian2, ZHONG Guanghai5, WANG Jun4, GENG Bin4, HU Qinhong6, LI Zhipeng4   

  1. 1. State Key Laboratory of Oil & Gas Reservoir Geology and Exploitation, Southwest Petroleum University, Chengdu 610500, China;
    2. School of Geoscience and Technology, Southwest Petroleum University, Chengdu 610500, China;
    3. Key Laboratory of Tectonics and Petroleum Resources, China University of Geosciences, Ministry of Education, Wuhan 430074, China;
    4. Research Institute of Exploration and Development, Sinopec Shengli Oilfield Company, Dongying 257015, Shandong, China;
    5. Research Institute of Shale Gas, PetroChina Southwest Oil & Gas Field Company, Chengdu 610500, China;
    6. Department of Earth and Environmental Sciences, University of Texas at Arlington, Arlington 76019, TX, USA
  • Received:2021-05-12 Revised:2021-07-14 Online:2022-01-01 Published:2022-01-21

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Abstract: To study the relationship between lacustrine shale interlayer and shale oil productivity of the third member of Shahejie Formation in Zhanhua Sag,based on the analysis of core description,thin section identification,X-ray diffraction,scanning electron microscope and mercury injection,deconvolution method was used to process logging data to identify interlayer types.The results show that:(1) The content of brittle minerals in sandy interlayers and calcareous interlayers is high,which is easy to form fractures. The mass fraction of quartz-feldspar and calcite-dolomite is as high as 46.7% and 57.95% respectively.(2) Abnormal pressure fractures,mineral contraction fractures and interlayer fractures are developed in the interlayer,and structural fractures are also developed in the sandy interlayer. The average permeability of fractured interlayer is 7.59 mD.(3) The interlayers mainly develop micro and nano pores with good pore connectivity,including intergranular pores,dissolved pores and intergranular pores. Intergranular pores are shown in sandy interlayer. Dissolved pores are shown in calcareous interlayer,with more macropores.(4) The logging curve response characteristics of the interlayers are as following:both sandy interlayers and limestone interlayers are characterized by low natural gamma and high resistivity,sandy interlayer has low return under high natural gamma background,three-porosity curve and deep lateral resistivity shift to the right and three-porosity curve of limestone interlayer is obviously closed to the right. Overlapping the natural gamma and deep lateral resistivity curves processed by deconvolution method, it is quick to identify the interlayer with higher resolution and more intuitive,and effective to identify the lacustrine shale interlayer, which provides a basis for shale oil evaluation.

Key words: shale oil, sandy interlayer, limestone interlayer, log identification, deconvolution, log overlapping method, Shahejie Formation, Zhanhua Sag

CLC Number: 

  • P631
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