# Seismic facies-controlled prestack simultaneous inversion of elastic and petrophysical parameters for favourable reservoir prediction

Sheng Zhang^{1}

^{2}

^{4}Handong Huang

^{1}

^{2}Baoheng Zhu

^{1}Huijie Li

^{3}Lihua Zhang

^{3}

^{1} China University of Petroleum, State Key Laboratory of Petroleum Resources and Prospecting, CNPC Key Lab of Geophysical Exploration, Beijing 102249, China.

^{2} Taiyuan University of Technology, College of Mining Engineering, Taiyuan 030024, China.

^{3} No. 1 Oil Production Plant, Petro China Huabei Oilfield Company, Renqiu 062552, China.

^{4} Corresponding author. Email: zhangsheng_2005@126.com

*Exploration Geophysics* - https://doi.org/10.1071/EG17048

Submitted: 20 March 2017 Accepted: 23 September 2017 Published online: 14 November 2017

## Abstract

Comprehensive utilisation of elastic and petrophysical parameters to predict favourable reservoirs can help reduce the possibility of misidentification of resources. Existing simultaneous inversion methods for estimating the elastic and petrophysical parameters are typically based on either the Gassmann equation, with which these parameters are inverted from prestack seismic data through stochastic optimisation methods, or Wyllie’s modified equation, with which these parameters are inverted from poststack seismic data using deterministic optimisation methods. The purpose of this work is to develop a strategy for estimating the elastic and petrophysical parameters based on the Gassmann equation using deterministic prestack inversion. We employ the Gassmann equation to construct the relationship between the prestack seismic data and petrophysical parameters. We treat the joint posterior probability of elastic and petrophysical parameters as the objective function under a Bayesian framework. Given the macroscopic geological background and the poor-quality prestack seismic data, seismic facies regularisation constraints were introduced to improve the robustness and accuracy of the inversion. The very fast-simulated annealing method is used to quickly find the optimal solutions for the elastic and petrophysical parameters. Based on a model test and the application of real data demonstrates that the proposed inversion method has high accuracy and strong reliability.

**Key words:** elastic parameters, favourable reservoir, petrophysical parameters, seismic facies-controlled, simultaneous inversion.

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