Lithologic Reservoirs ›› 2023, Vol. 35 ›› Issue (2): 1-10.doi: 10.12108/yxyqc.20230201

• PETROLEUM EXPLORATION • Previous Articles     Next Articles

Evaluation of pore effectiveness of Quaternary mudstone biogas reservoirs in Sebei area, Qaidam Basin

SIMA Liqiang1,2, MA Jun1,2, LIU Junfeng3, YANG Huijie3, WANG Liang4, ZHAO Ning1,2   

  1. 1. School of Geoscience and Technology, Southwest Petroleum University, Chengdu 610500, China;
    2. State Key Laboratory of Oil and Gas Reservoir Geology and Exploration, Southwest Petroleum University, Chengdu 610500, China;
    3. Research Institute of Exploration and Development, PetroChina Qinghai Oilfield Company, Dunhuang 736202, Gansu, China;
    4. College of Energy Resources, Chengdu University of Technology, Chengdu 610059, China
  • Received:2022-05-24 Revised:2022-07-18 Online:2023-03-01 Published:2023-03-07

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Abstract: Through low-field NMR experiments, the T2 spectra of the Quaternary mudstone biogas reservoirs in the Sebei area of Qaidam Basin were analyzed under saturated water state and gradient drying temperature state, and the NMR response characteristics of pore fluids were clarified to evaluate the effectiveness of pores. The results show that:(1) Based on the T2 spectrum under the saturated water state, the centrifugal bound water T2 spectrum was constructed by fitting the normal distribution function, the T2 cutoff values of movable fluid and capillary bound fluid were determined, the fluid types were divided, and the pore effectiveness evaluation was carried out. (2) The T2 spectral peaks of water-saturated rock samples in the study area are small on the left and large on the right, and the amplitude of the right peak is much larger than that of the left peak, accounting for more than 90% of the T2 spectral amplitude. With the increase of drying temperature, the amplitude of the T2 spectrum decreases and the left shift trend is obvious. The T2 spectrum shape of the bound water is approximately normal distribution, and the starting position basically coincides with the T2 spectrum under the saturated water state.(3) The T2 cutoff value(T2 C1) of movable fluid in the study area is 3.3 ms on average, and the average T2 cutoff value(T2 C2) of capillary bound fluid is 1.8 ms. The pore fluids include movable water, capillary bound water and clay bound water. The clay bound water T2 is less than T2 C2, and the capillary bound water T2 is larger than T2 C2 and less than T2 C1, and the movable fluid T2 is larger than T2 C1. The capillary bound water content is the highest, followed by the clay irreducible water, which account for 84.43%-95.06% of the total pore fluids, and the movable water content is low.(4) The effective pores of the reservoir in the study area account for 54.99% of the total pores and are mainly capillary-bound pores, and clay-bound pores are ineffective pores. The higher the clay content, the smaller the effective porosity.

Key words: biogas, mudstone-type reservoir, low-field NMR, T2 spectrum, pore availability, Quaternary, Sebei area, Qaidam Basin

CLC Number: 

  • TE122.2
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