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Applied Sciences
Volume 11
Issue 23
10.3390/app112311244
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Article
Peer-Review Record

Compressive Behavior of Oil Shale with Calcareous Concretion: Parametric Study

Appl. Sci. 2021, 11(23), 11244; https://doi.org/10.3390/app112311244
by Jinxing Lyu 1,2, Jisen Shu 1, Liu Han 1,*, Gerson S. V. Tovele 1 and Tao Chen 1
Reviewer 1:
E. G. Panova
Reviewer 2: Anonymous
Reviewer 3: Anonymous
Appl. Sci. 2021, 11(23), 11244; https://doi.org/10.3390/app112311244
Submission received: 20 October 2021 / Revised: 21 November 2021 / Accepted: 23 November 2021 / Published: 26 November 2021
(This article belongs to the Special Issue The Numerical Analysis in Rock)

Round 1

Reviewer 1 Report

Dear editors, Dear authors, the article is very important due to the relevance of the development of oil shale. The article devotes to the parametric analysis of the system of the host shale and the concretion complex.  The parametric analysis is a multivariate analysis aimed at studying the influence of external and internal parameters of the system on the quality of its functioning.
At the same time, any type of modeling involves several stages: a detailed description of the natural system, a description of laboratory tests and models process, checking the operation of the model on a natural object. The resulting model will depend on the input parameters taken into account.
The article requires a more detailed description of the study object. The composition of the shale can affect the result of the simulation. The proportion of organic carbon, the composition of the hydrocarbon component, the porosity of the shale are parameters that need to be characterized.
The concretion complex usually has a calcite composition. Concretions have a dark brown color due to the presence of organic material in them.
Concretions are extremely uneven in crystal size. The lower part has a fine-grained structure, and the upper part is represented by giant-grained crystals.
The structural and chemical concretion characteristics can influence to the simulation result.

 

Author Response

Please see the attachment.

Author Response File: Author Response.pdf

Reviewer 2 Report

Thanks to Lyu et al. providing such a study regarding compressive behavior of shale focusing on the parametric study. The below are some comments/suggestions hopefully to improve the revised manuscript.

  1. Kindly improve the introduction part regarding unconventional shale development. The article below is suggested as a starting point for the authors. Investigations of CO2 storage capacity and flow behavior in the shale formation. Journal of Petroleum Science and Engineering
  2. Please provide more quantativle data in the abstract from the simulation results.
  3. Please add more details on what other previous work did not achieve that are objective of this study.
  4. Kindly add scale bars clearly in Fig. 1\2 and other figures.
  5. Kind add PFC2D version.

Author Response

Please see the attathment.

Author Response File: Author Response.pdf

Reviewer 3 Report

This paper investigated compressive behavior of oil shale with the concretion via the PFC2D.

The simulation results seem interesting, but I think there is still room to improve the structure of this paper for a strong conclusion. The four conclusions are all qualitative interpretations of simulation results, and the authors did not state why these conclusions of compressive behavior for oil shale are important. Nevertheless, I suggest a major revision for this paper because there is still plenty of room for improvement especially on summarizing the importance of findings from the numerical simulations and how could we leverage these findings to guide the cost-effectively excavate in the field. I will be happy to look at this paper after it has been carefully edited to make it easier for readers to digest.

My major comments can be found as below.

  • There is a gap between the experiments and numerical simulations. I cannot find what is the critical support provided by the experiment for the modeling settings for PFC2D.
  • I would like to see more quantitative results based on the numerical studies.
  • A table listing the relationship between failure modes and different groups will be great for readers to better understand the impact of concretion of failure modes.

 

After addressing those comments, readers will be able to have a better understanding of this paper and extract the contributions of this great work.

Author Response

Please see the atathment.

Author Response File: Author Response.pdf

Round 2

Reviewer 3 Report

I like the added Section 4.5 for practical applicaiton. Now the readers can understand the importance of this paper better.

Author Response

Thanks a lot for your appreciated work in reviewing the manuscript.

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