Lithologic Reservoirs ›› 2020, Vol. 32 ›› Issue (6): 50-61.doi: 10.12108/yxyqc.20200605

• PETROLEUM GEOLOGY • Previous Articles     Next Articles

Division of sedimentary cycle of sandy conglomerate body and its relationship with physical properties: a case study from the upper submenber of the fourth member of Shahejie Formation in Y920 block of northern steep slope zone in Dongying Sag

QING Fan1,2, YAN Jianping1,2,3, WANG Jun4, GENG Bin4, WANG Min4, ZHAO Zhenyu5, CHAO Jing4   

  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, Ministry of Education, China University of Geosciences, Wuhan 430074, China;
    4. Institute of Exploration and Development, Shengli Oilfield Company, Sinopec, Dongying 257015, Shandong, China;
    5. PetroChina Research Institute of Petroleum Exploration & Development, Beijing 100083, China
  • Received:2020-02-09 Revised:2020-04-20 Online:2020-12-01 Published:2020-10-30

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Abstract: The sandy conglomerate reservoirs have complex lithology and strong heterogeneity,and the fan bodies are stacked in multiple stages,making it difficult to divide the sedimentary cycle. Based on core and FMI images, with the well logging information wavelet transform technology as the core,and with 3D seismic as the constraint,the method of sedimentary cycle division of sandy conglomerate fan body was established by taking the upper submenber of the fourth member of Shahejie Formation in Y920 block of the northern steep slope zone in Dongying Sag as the research object. Based on core and FMI images,the interface of sedimentary cycle can be identified intuitively,and then conventional logging data can be calibrated. The wavelet coefficient curve showing oscillation characteristics after the wavelet transform of logging information can reflect the response characteristics of the sedimentary interface,and the sedimentary period of a single well can be divided quantitatively by combining the scale factor of power spectrum screening. Through the well-seismic combination,the isochronic comparison of the cycle interfaces in the entire region was achieved,and the sandy conglomerate body in Y920 block was divided into 8 sedimentary cycles. The development of the sedimentary cycle controls the distribution of sedimentary facies and lithology,which is also closely related to the distribution of physical properties. The results show that the strata in the study area show good physical properties in the middle and upper part of sedimentary cycle in the initial stage of retrograde deposition(root-middle fan)from the bottom to the top(8 to 1 sedimentary cycle),and the strata show good physical properties in the entire sedimentary cycle of the intermediate deposition stage(middle fan)and the middle and lower parts of sedimentary cycle in the final deposition stage(middle-bottom fan). Furthermore,the thickness of the effective reservoirs in each cycle of a single well was counted,and the planar distribution characteristics of the effective reservoirs were described in cycles. It is found that the northwest of 3,4 and 5 sedimentary cycles is the favorable reservoir distribution range of Y920 block. The research results provide a basis for fine exploration and development of sandy conglomerate reservoirs in the northern steep slope zone of Dongying Sag.

Key words: sandy conglomerate, sedimentary cycle, wavelet transform, physical properties, effective reservoir distribution, Dongying Sag

CLC Number: 

  • TE121.3
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