Open Access

ARTICLE

Research on Quantitative Identification of Three-Dimensional Connectivity of Fractured-Vuggy Reservoirs

Xingliang Deng¹, Peng Cao^2,*, Yintao Zhang¹, Yuhui Zhou³, Xiao Luo¹, Liang Wang³

1 Exploration and Development Research Institute, PetroChina Tarim Oilfield Company, Korla, 841000, China
2 PetroChina Hangzhou Research Institute of Geology, Hangzhou, 310023, China
3 School of Petroleum Engineering, Yangtze University, Wuhan, 430100, China

* Corresponding Author: Peng Cao. Email:

Energy Engineering 2024, 121(5), 1195-1207. https://doi.org/10.32604/ee.2023.045870

Received 10 September 2023; Accepted 10 November 2023; Issue published 30 April 2024

Abstract

The fractured-vuggy carbonate oil resources in the western basin of China are extremely rich. The connectivity of carbonate reservoirs is complex, and there is still a lack of clear understanding of the development and topological structure of the pore space in fractured-vuggy reservoirs. Thus, effective prediction of fractured-vuggy reservoirs is difficult. In view of this, this work employs adaptive point cloud technology to reproduce the shape and capture the characteristics of a fractured-vuggy reservoir. To identify the complex connectivity among pores, fractures, and vugs, a simplified one-dimensional connectivity model is established by using the meshless connection element method (CEM). Considering that different types of connection units have different flow characteristics, a sequential coupling calculation method that can efficiently calculate reservoir pressure and saturation is developed. By automatic history matching, the dynamic production data is fitted in real-time, and the characteristic parameters of the connection unit are inverted. Simulation results show that the three-dimensional connectivity model of the fractured-vuggy reservoir built in this work is as close as 90% of the fine grid model, while the dynamic simulation efficiency is much higher with good accuracy.

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