Dear Dr.

The reviewers have commented on your above paper. They indicated that it is not acceptable for publication in its present form.

I would appreciate if you could submit your revised paper by Jul 22, 2016.

However, if you feel that you can suitably address the reviewers\' comments (included below), I invite you to revise and resubmit your manuscript.

Please carefully address the issues raised in the comments.

If you are submitting a revised manuscript, please also:

a) outline each change made (point by point) as raised in the reviewer comments
   
  AND/OR

b) provide a suitable rebuttal to each reviewer comment not addressed


To submit your revision, please do the following:

1. Go to: http
2. Enter your login details

3. Click [Author Login]
This takes you to the Author Main Menu.

4. Click [Submissions Needing Revision]

NOTE: Upon submitting your revised manuscript, please upload the source files for your article. For additional details regarding acceptable file formats, please refer to the Guide for Authors at

When submitting your revised paper, we ask that you include the following items:

Manuscript and Figure Source Files (mandatory)

We cannot accommodate PDF manuscript files for production purposes. We also ask that when submitting your revision you follow the journal formatting guidelines.  Figures and tables may be embedded within the source file for the submission as long as they are of sufficient resolution for Production. For any figure that cannot be embedded within the source file (such as *.PSD Photoshop files), the original figure needs to be uploaded separately. Refer to the Guide for Authors for additional information.


Highlights (mandatory)

Highlights consist of a short collection of bullet points that convey the core findings of the article and should be submitted in a separate file in the online submission system. Please use \'Highlights\' in the file name and include 3 to 5 bullet points (maximum 85 characters, including spaces, per bullet point). See the following website for more information


Graphical Abstract (optional)

Graphical Abstracts should summarize the contents of the article in a concise, pictorial form designed to capture the attention of a wide readership online. Refer to the following website for more information: https://www.elsevier.com/graphicalabstracts

Please note that this journal offers a new, free service called AudioSlides: brief, webcast-style presentations that are shown next to published articles on ScienceDirect  If your paper is accepted for publication, you will automatically receive an invitation to create an AudioSlides presentation.

I look forward to receiving your revised manuscript.

Yours sincerely,

David A. Wood, Ph.D.
Editor-in-Chief
Journal of Natural Gas Science & Engineering

Note: While submitting the revised manuscript, please double check the author names provided in the submission so that authorship related changes are made in the revision stage. If your manuscript is accepted, any authorship change will involve approval from co-authors and respective editor handling the submission and this may cause a significant delay in publishing your manuscript.

Reviewers\' comments:

Reviewer #1: The manuscript presents an interesting idea. The proposed idea is practically important for fracture studies.

* The title should be modified to be more specific/informative.
** The authors should elaborate of their CFD analysis, providing some details.
Q- Is 69.3 pixels correct? I think it should be an integer.

Reviewer #2: Page 2; Introduction section
*        Line 13. "Fracture structures scatter in coal mass". This sentence needs more clarification; do you mean fracture structures are scattered or pervasive in the coal mass. Kindly clarify?
*        Line 17. "…statistical regularity"; I think you mean statistical irregularity
*        Line 25. The cited  reference "Ma et al. (2014)" is not in the references list
*        Line 60. The cited year of reference "Persoff and Pruess (1988)" showed up at 1995 in the reference list 返回小木虫查看更多