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Natural Gas Exploration and Development >

2023 , Vol. 46 >Issue 3: 33 - 41

DOI: https://doi.org/10.12055/gaskk.issn.1673-3177.2023.03.004

RESOURCES EXPLORATION

Application of array acoustic logging technology in volcanic reservoir evaluation

  • WU Yuyu ,
  • ZHAO Zuoan ,
  • LAI Qiang ,
  • ZHUANG Chunxi ,
  • ZHANG Yihua ,
  • WANG Zeyu
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  • 1. Exploration and Development Research Institute, PetroChina Southwest Oil & Gasfield Company, Chengdu, Sichuan 610041, China;
    2. PetroChina Southwest Oil & Gasfield Company, Chengdu, Sichuan 610051, China;
    3. China University of Petroleum (East China), Qingdao, Shandong 266555, China;
    4. Southwest Branch, China Petroleum Engineering & Construction Corporation, Chengdu, Sichuan 610017, China

Revised date: 2023-07-20

  Online published: 2023-09-21

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Abstract

To finely evaluate the effectiveness and gas potential of volcanic reservoirs of the Permian in the Sichuan Basin, an in-depth study was conducted on array acoustic logging data. A method for evaluating reservoir effectiveness was established based on the Stoneley wave attenuation, and reflection wave and P-wave velocity tomography. And a method for discriminating reservoir fluid property was developed using the rock mechanical parameters calculated from array acoustic data. Finally, the development of fractures/vugs near wellbore was quantitatively characterized by dipole S-wave remote detection, providing reasonable interpretations for single-well testing. The research results are as follows: (i) Volcanic reservoirs in the Sichuan Basin are mainly composed of volcaniclastic rocks, characterized by good reservoir properties, significant Stoneley wave attenuation, high reflection coefficient (higher in the low-frequency interval than in the high-frequency interval), obvious radial variation of acoustic velocity in formation, and significant hysteresis of the arrival time curve, reflecting strong permeability and good effectiveness of reservoir. (ii) When the formation contains gas, the velocity ratio of P wave to S wave decreases, the Poisson’s ratio decreases while the bulk modulus increases. The envelope area derived by the intersection of Poisson’s ratio and bulk modulus can effectively discriminate the gas potential of reservoir. (iii) The image of dipole S-wave remote detection shows that high-angle fractures are developed outside the interval of Well T2, which provide pathways for formation water, resulting in formation water produced from gas-bearing interval.

Key words： Array acoustic logging; Stoneley wave attenuation; Velocity tomography; Dipole S-wave remote detection; Volcanic rock; Reservoir evaluation

Cite this article

WU Yuyu , ZHAO Zuoan , LAI Qiang , ZHUANG Chunxi , ZHANG Yihua , WANG Zeyu . Application of array acoustic logging technology in volcanic reservoir evaluation[J]. Natural Gas Exploration and Development, 2023 , 46(3) : 33 -41 . DOI: 10.12055/gaskk.issn.1673-3177.2023.03.004

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