Lithologic Reservoirs ›› 2026, Vol. 38 ›› Issue (2): 76-85.doi: 10.12108/yxyqc.20260207

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Fluid activity attribute-constrained inversion method for tight reservoirs of Jurassic Ahe Formation in Dibei gas reservoir, Kuqa Depression

PENG Fen1(), REN Dengfeng1, PENG Jianxin1, WEI Hongxing2   

  1. 1 Oil and Gas Engineering Research Institute, PetroChina Tarim Oilfield Company, Korla 841000, Xinjiang, China
    2 Research Institute of Exploration and Development, PetroChina Tarim Oilfield Company, Korla 841000, Xinjiang, China
  • Received:2024-12-10 Revised:2025-03-24 Online:2026-03-01 Published:2026-02-05

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Abstract:

Tight sandstone gas reservoirs generally suffer from poor physical properties and strong heterogenei-ty, and conventional seismic inversion methods have poor performance in fluid identification in such reservoirs. Based on matching pursuit, ensemble empirical mode decomposition, fluid activity attribute extraction, and Bayesian theory, a regularized inversion method constrained by fluid activity attributes was proposed. The method was validated through model data testing and applied to predict tight sandstone reservoirs in Jurassic Ahe Formation of Dibei gas reservoir in Kuqa Depression. The results show that: （1） The main idea of fluid activity attribute-constrained inversion is to perform time-frequency analysis using MP-EEMD technique to extract fluid activity attributes, and to construct the inversion objective function under Bayesian theory, in which the norma-lized fluid activity attributes are incorporated as soft constraints. (2) Model data tests show that MP-EEMD time-frequency spectrum overcomes multi-frequency interference, achieving higher resolution in both time and frequency domains. Furthermore, the inversion results with fluid constraints demonstrate superior predictive performance for fluid-bearing formations compared with conventional inversion. (3) The application of fluid activity attributes-constrained inversion in Jurassic Ahe Formation reservoirs in Dibei gas field of Kuqa Depression shows that： inverted P-wave velocity results exhibit higher consistency with well-logging interpretations, and with improved thin-bed characterization, achieving higher vertical resolution compared with conventional methods.

Key words: tight sandstone, reservoir prediciton, fluid activity attribute, post-stack inversion, matching pursuit, fluid detection, Ahe Formation, Jurassic, Dibei gas reservoir, Kuqa Depression

CLC Number: 

  • TE3111

Fig. 1

Tectonic unit division (a)， reservoir profile (b), and comprehensive stratigraphic column of Jurassic （c） of Dibei gas reservoir in Kuqa Depression"

Fig. 2

Synthetic signals containing multi-frequency interference"

Table 1

Wavelet parameters"

子波 表达式 参数
W1 $ D \cdot \sin (2 \pi \cdot v t)$ D = 1,v = 10 Hz
W2 $ \begin{array}{c}D \cdot \exp \left[-4 \ln 2 v^{2} \sigma^{-2}(t-\tau)^{2}+\right. \\i 2 \pi v(t-\tau)]\end{array}$ D = 5,σ = 1,
v = 20 Hz,τ = 0.1 s
W3 D = 5,σ = 1,
v = 40 Hz,τ = 0.2 s
W4 D = 5,σ = 1,
v = 60 Hz,τ = 0.3 s

Fig. 3

Reconstruction of synthetic signals and comparison of methods"

Fig. 4

Post-stack amplitude spectra for different lithologies (a) and the corresponding amplitude gradients (b) of Jurassic Ahe Formation in gas-bearing well A1，Kuqa Depression"

Fig. 5

Seismic trace (a) and seismic fluid activity attribute (b) of Jurassic Ahe Formation near gas-bearing well A1 in Kuqa Depression"

Fig. 6

Seismic trace (a) and corresponding seismic fluid activity attribute (b) of Jurassic Ahe Formation near water-cut well A2 in Kuqa Depression"

Fig. 7

Fluid activity attribute profile of Jurassic Ahe Formation between well A1 and well A2 in Kuqa Depression"

Fig. 8

Comparison between 1D sparse-spike inversion and fluid activity attribute-constrained inversion based on 1D synthetic data"

Fig. 9

Seismic sections of Jurassic Ahe Formation of well A to well B in Dibei gas reservoir, Kuqa Depression"

Fig. 10

Spectral characteristics of seismic data from Jurassic Ahe Formation in Dibei gas reservoir, Kuqa Depression"

Fig. 11

Post-stack fluid detection profile of Jurassic Ahe Formation in well C of Dibei gas reservoir, Kuqa Depression"

Fig. 12

Results comparison of conventional inversion and fluid-constrained inversion of Jurassic Ahe Formation between well A and well B in Dibei gas reservoir, Kuqa Depression"

Fig. 13

Effective reservoir thickness of H0 sublayer of Jurassic Ahe Formation between well A and well B in Dibei gas reservoir, Kuqa Depression"

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