A method for interpretating acoustic reflection imaging logging data of fractured-vuggy reservoirs based on their theoretical response characteristics

Authors

HUANG Ruokun, Research Institute of Exploration and Development, Tarim Oilfield Company, PetroChina, Korla 841000, China; School of Geosciences, China University of Petroleum, Qingdao 266580, China; Xinjiang Key Laboratory of Ultra-deep Oil and Gas, Korla 841000, ChinaFollow
JIANG Kai, State Key Laboratory of Petroleum Resources and Engineering, China University of Petroleum(Beijing), Beijing 102249, China
WU Xingneng, Research Institute of Exploration and Development, Tarim Oilfield Company, PetroChina, Korla 841000, China; School of Geosciences, China University of Petroleum, Qingdao 266580, China; R&D Center for Ultra-Deep Complex Reservoir Exploration and Development, CNPC, Korla 841000, China
MA Kunyu, State Key Laboratory of Petroleum Resources and Engineering, China University of Petroleum(Beijing), Beijing 102249, China
SU Yuanda, School of Geosciences, China University of Petroleum, Qingdao 266580, China
WANG Bing, State Key Laboratory of Petroleum Resources and Engineering, China University of Petroleum(Beijing), Beijing 102249, ChinaFollow
CHEN Xu, Research Institute of Exploration and Development, Tarim Oilfield Company, PetroChina, Korla 841000, China; School of Geosciences, China University of Petroleum, Qingdao 266580, China; Xinjiang Key Laboratory of Ultra-deep Oil and Gas, Korla 841000, China

Abstract

Objective During the exploration and development of fractured-vuggy carbonate reservoirs, acoustic reflection imaging logging technology enables the detection of fractured-vuggy bodies around wells. However, this technology suffers from unclear response characteristics and a strong multiplicity of solutions. Focusing on the Tarim Oilfield, this study aims to establish a tailored interpretation method by integrating geological and geophysical characteristics. The purpose is to enhance the identification accuracy and reliability of fractured-vuggy bodies in these reservoirs. Methods Based on the distribution characteristics of fractured-vuggy carbonate reservoirs in the Tarim Oilfield, this study established the numerical simulation models of three typical fractured-vuggy bodies: inter-breccia porous, fault-cavity, and tectonic-fracture types. Then, the imaging results of acoustic reflection imaging logging data were optimized using Hilbert transform-based envelope extraction and vertical constraint-based data reconstruction technique. Using the finite-difference numerical algorithm, this study simulated the theoretical reflection wavefields of various fractured-vuggy bodies. Then, using the optimized procedure for the imaging results of acoustic reflection imaging logging data, this study processed the migration imaging results of different types of fractured-vuggy bodies and summarized their typical characteristics. Based on typical theoretical response characteristics, the imaging results of acoustic reflection imaging logging data can be interpreted. Results and Conclusions The imaging results of acoustic reflection imaging logging data, obtained using the optimized procedure, exhibited clearer features. Compared to the imaging response characteristics of forward modeling, the imaging results of acoustic reflection imaging logging data revealed the presence of three sets of reflectors in the target interval. These reflectors were characterized by clear and distinct imaging results, mutual independence, and the occurrence of arc-like pseudomorph caused by adjacent reflectors. These characteristics aligned with the imaging response characteristics of fault-cavity-type fractures, demonstrating that these extra-well reflectors at this well interval are of the fault-cavity type. The interpretation results corresponded well with conclusions from well tests, confirming the presence of high-productivity fault-cavity-type fractured-vuggy reservoirs at this interval. The processing results of actual data validated the reliability of the identification of fractured-vuggy carbonate bodies based on theoretical response characteristics. This method provides robust technical support for the precise identification and interpretation of near-well fractured-vuggy carbonate bodies in the Tarim Basin.

Keywords

fractured-vuggy carbonate reservoir, acoustic reflection imaging logging, 3D finite difference, theoretical response characteristics, identification of fractured-vuggy, imaging feature extraction

DOI

10.12363/issn.1001-1986.25.05.0392

Recommended Citation

HUANG Ruokun, JIANG Kai, WU Xingneng, et al. (2025) "A method for interpretating acoustic reflection imaging logging data of fractured-vuggy reservoirs based on their theoretical response characteristics," Coal Geology & Exploration: Vol. 53: Iss. 11, Article 8.
DOI: 10.12363/issn.1001-1986.25.05.0392
Available at: https://cge.researchcommons.org/journal/vol53/iss11/8

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