An alternative approach to match field production data from unconventional gas-bearing systems
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ORIGINAL PAPER
An alternative approach to match field production data from unconventional gas‑bearing systems Zhi‑Gang Zhang1,2 · Yan‑Bao Liu1,2 · Hai‑Tao Sun1,3 · Wei Xiong1 · Kai Shen1 · Quan‑Bin Ba1 Received: 12 November 2019 © The Author(s) 2020
Abstract Nowadays, the unconventional gas-bearing system plays an increasingly important role in energy market. The performances of the current history-matching techniques are not satisfied when applied to such systems. To overcome this shortfall, an alternative approach was developed and applied to investigate production data from an unconventional gas-bearing system. In this approach, the fluid flow curve obtained from the field is the superposition of a series of Gaussian functions. An automatic computing program was developed in the MATLAB, and both gas and water field data collected from a vertical well in the Linxing Block, Ordos Basin, were used to present the data processing technique. In the reservoir study, the automatic computing program was applied to match the production data from a single coal seam, multiple coal seams and multiple vertically stacked reservoirs with favourable fitting results. Compared with previous approaches, the proposed approach yields better results for both gas and water production data and can calculate the contributions from different reservoirs. The start time of the extraction for each gas-containing unit can also be determined. The new approach can be applied to the field data prediction and designation for the well locations and patterns at the reservoir scale. Keywords Gaussian function · Flow rate · Unconventional gas · Ordos Basin · Gas-bearing reservoirs
1 Introduction The unconventional gas-bearing system, containing continuous accumulations of unconventional natural gases, has attracted much attention with the depletion of conventional natural gases (Feng et al. 2016; Cui et al. 2019). It is widely found in the Ordos Basin, China, and Cooper Basin, Australia. As two or more gas-bearing reservoirs co-exist in the systems bringing more difficulties, current Edited by Yan-Hua Sun * Zhi‑Gang Zhang zzg‑[email protected] * Yan‑Bao Liu [email protected] 1
National Key Laboratory of Gas Disaster Detecting, Preventing and Emergency Controlling, Chongqing 400037, China
2
Chongqing Research Institute of China Coal Technology and Engineering Group Crop., Chongqing 400037, China
3
School of Resources and Safety Engineering, Chongqing University, Chongqing 400045, China
history-matching approaches do not perform well when applied to such system. This work mainly attempts to overcome these difficulties. The concept of a gas-bearing system can be dated back to the 1970s by Dow (1974) and was further developed by Masters (1979) and Magoon (1994). In the system, a series of gas reservoirs can be developed continuously in adjacent strata in the same basin. With the exhaustion of conventional reservoirs, more researchers investigated unconventional gas-bearing systems (Collett 2002; Curtis 2002; Law 2002; Schmoker 2002; Shurr and
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