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Applications of AVO Attributes in the Prediction of Tight Gas Reservoirs and Optimization of Horizontal Well Trajectory in Xihu Sag of the East China Sea

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Abstract

The target formation of a gas field in the middle south part of the Xihu sag of the East China Sea as the characteristics of deep burial depth, serious heterogeneity, low porosity, and permeability is inapplicable to predict reservoir using the post-stack seismic attribute and inversion technique failed to because the acoustic impedance of sand and shale is overlapped. However, AVO attribute has a good effect on the prediction of gas-bearing sandstone reservoirs. In this paper, AVO attribute is used to predict the reservoir. First, the influence of gas saturation, reservoir porosity, and thickness on the AVO is analyzed by seismic forward modeling. Results suggest that gas saturation has little effect on the AVO, and porosity and thickness of sandstones have significant influence on the AVO for the tight gas reservoirs. And then use the stored filter technique to complete the −90° phase conversion and frequency division interpretation work to obtain the relative Poisson ratio attribute for lithology prediction. According to the relative Poisson ratio attribute and result of strata slices, the distribution of sandstones is studied and the result is used to optimize the trajectory of the horizontal well, which is designed to develop the target tight gas reservoir. The drilling result shows a good consistent with reservoir prediction that the encountering rate of sandstone is 100%.

Keywords

  • Tight gas-bearing reservoir
  • AVO attribute
  • Relative poison’s ratio
  • Stored filter technique
  • Strata slices
  • Horizontal well trajectory
  • East China Sea

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Acknowledgements

We would like to thank Professor Zhong Guangfa of Tongji University, Guo Shisheng and Shan Lijun (CNOOC Shanghai Branch) for their help. This work is funded by the National Science and Technology Major Project of China (2016ZX05027-003). And thanks CNOOC Shanghai Branch for permission to publish this paper.

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Correspondence to Dewen Qin .

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Gao, H., Qin, D., Cao, B., Liu, C., Zhong, T. (2019). Applications of AVO Attributes in the Prediction of Tight Gas Reservoirs and Optimization of Horizontal Well Trajectory in Xihu Sag of the East China Sea. In: Shemwell, S., Lin, J. (eds) Proceedings of the International Petroleum and Petrochemical Technology Conference 2018. IPPTC 2018. Springer, Singapore. https://doi.org/10.1007/978-981-13-2173-3_1

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  • DOI: https://doi.org/10.1007/978-981-13-2173-3_1

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