Quantitative Characterization of Fractured-Vuggy Carbonate Reservoirs

doi:10.7657/XJPG20210216

Abstract

Abstract:

The Ordovician carbonate reservoirs in the north of Tarim basin are fractured and vuggy. On seismic sections, the seismic responses of the fractured-vuggy reservoirs are mostly “bead-like” strong reflections and chaotic reflections. We designed different fracture-vug models, compared the seismic response characteristics with the heights and external shapes of the fractures and vugs in the fracture-vug models, and quantitatively characterized the fractures and vugs on various scales based on the results calculated from the seismic resolution theory formula. The results are that: the external shape of the fractures and vugs more than 50 m high can be quantitatively described, and their volumes can be calculated with high reliability; the volume, center points and roofs of fractures and vugs of 10-50 m high can be identified, semi-quantitative identification and accurate calculation of their volumes can be carried out with average reliability; and the fractures and vugs less than 10 m high can only be qualitatively predicted on their lateral and vertical distribution, and the reliability of volume calculation is low. After characterization and quantitative calculation using seismic attributes on various scales, the multiplicity of quantitative characterization of fractures and vugs is effectively reduced. The results provide basic data for target evaluation and well location optimization.

Key words: Tarim basin, Ordovician, carbonate rock, fractured-vuggy reservoir, seismic response, forward modeling, quantitative characterization

CLC Number:

TE112.221

DENG Guangxiao, HU Wenge, WANG Zhen. Quantitative Characterization of Fractured-Vuggy Carbonate Reservoirs[J]. Xinjiang Petroleum Geology, 2021, 42(2): 232-237.

Figures/Tables 8

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Table 1

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