Application of Pre-Stack Inversion to a Complex Reservoir Prediction: a Case Study in LG34 Area, Tarim Basin

Abstract:

The Donghe Sandstone formation (DS fm. for simplicity) presents an excellent thin condensate gas reservoir in LG34 well area, Tarim Basin. Unfortunately, drilling results show that the reservoir is thin, deeply buried (below 5000m) and mix lithologies. Pre-stack inversion and fluid identification is implemented in this area. The feasibility and validity of pre-stack inversion for this kind of reservoir is tested, since that application of pre-stack inversion in this area is for the first time. A new rock physics model is used for estimating rock velocities and elastic attributes, and cross-plots of Poisson's ratio (σ) again LambdaRho (λρ) is found to be more favorable for lithofacies identification. Then, pre-stack inversion which uses seismic data with careful amplitude processing is performed to predict the reservoir. The inversion results agree and tie with most wells, suggesting that the pre-stack inversion is viable process for this complex lithological reservoir prediction in the area.

• Periodical: Advanced Materials Research (Volumes 468-471)
• Pages: 624-627
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.468-471.624
• Online since: February 2012
• Authors: Xin Chao Zhang, Sam Zan Dong Sun, Hai Yang Wang, Yuan Yin Zhang, Hong Liang Gao, Bing Jing
• Keywords: Donghe Sandstone, Elastic Attributes, Pre-Stack Inversion, Reservoir Prediction

References

[1] Z. Wang,, J. Tian, Y. Shen, et al, Journal of Palaeogeography, Vol. 6, No. 3, 289-296 (2004) (In Chinese)

[2] J. Gu, X. Zhang, and B. Guo, Journal of Palaeogeography, Vol. 8, No. 3, 285-294 (2006) (In Chinese)

[3] H. Wang, Sam Z.D. Sun, Y. Li, et al., The 79th Annual International Meeting, SEG, Expanded Abstracts, 2194-2198 (2009)

[4] Sam Z.D. Sun, S. R. Stretch, and R. J. Brown., From Rock Physics to Exploration Problem: JCPT, Vol.43, No.10 (2004)