Lithologic Reservoirs ›› 2023, Vol. 35 ›› Issue (6): 147-158.doi: 10.12108/yxyqc.20230616

• PETROLEUM EXPLORATION • Previous Articles    

Characteristics and new prediction methods of Jurassic subsalt carbonate reservoirs in the eastern right bank of Amu Darya,Central Asia

TANG Yuzhe1,2, CHAI Hui3, WANG Hongjun1, ZHANG Liangjie1, CHEN Pengyu1, ZHANG Wenqi1, JIANG Lingzhi1, PAN Xingming2   

  1. 1. PetroChina Research Institute of Petroleum Exploration & Development, Beijing 100083, China;
    2. Beijing Petroleum Machinery Co., Ltd., CNPC Engineering Technology R & D Co., Ltd., Beijing 102206, China;
    3. China Amu Darya Gas Company, CNPC(Turkmenistan), Beijing 100101, China
  • Received:2023-05-30 Revised:2023-06-27 Online:2023-11-01 Published:2023-11-07

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Abstract: Based on core,thin section,and well logging data,the lithologies,reservoir space,and physical properties of Jurassic Oxfordian reservoir in the eastern right bank of Amu Darya in Central Asia were analyzed.3D seismic data were used to carry out semi-quantitative prediction of reservoir distribution and thickness through methods such as forward seismic modeling,waveform clustering,frequency-division RGB fusion and ensemble learning. The results show that:（1）The lithologies of Jurassic Oxfordian reservoir in the eastern right bank of Amu Darya are mainly bioclastic limestone,grainstone and micritic limestone,and the reservoirs are characterized by fractured-vuggy type. The reservoir space is dominated by biological framework pores,intragranular pores and fractures,and fractures provide a channel for later dissolution fluids. The average thickness of the reservoir is 41.6 m,and the average porosity is 4.65%.（2）The reservoirs in the study area are mostly developed in the XVhp layer,and can be divided into top-type,bottom-type,and dual-type according to their distribution position in the XVhp layer. The top-type reservoirs are mainly distributed in the central and eastern parts of the study area,the bottom-type reservoirs are concentrated in the west,while the dual-type reservoirs are extensively developed in the northwest. The reservoirs in the western and northeastern parts of the study area are well developed,with a thickness of 45-75 m,mostly distributed along fault zones. The reservoirs in the southeastern part are poorly developed,with a thickness less than 30 m,and are further away from faults.（3）When using ensemble learning method to calculate the reservoir thickness in the study area,the stacking method in the heterogeneous ensemble approach was used for model computation. Outliers were eliminated using a boxplotbased method,and the predictive performance of the models was evaluated through cross-validation. The calculated reservoir thickness showed a high degree of agreement with the thickness observed in 11 wells drilled in the study area,and the correlation coefficient is 0.74.

Key words: fractured-vuggy reservoir, forward modeling, waveform clustering, frequency-division RGB fusion, machine learning, subsalt carbonate, Oxfordian, Jurassic, right bank of Amu Darya

CLC Number: 

  • TE122.1
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