The Analysis of Bio-Precursor Organic Matter Compositions and Its Significance for Gas Shale Reservoir of Wufeng–Longmaxi Formation from Dingshan Area, Sichuan Basin
Round 1
Reviewer 1 Report
I have read the manuscript titled "The semi-quantitative analysis of bio-precursor organic matter 2 compositions and its significance of shale gas reservoir from 3 Wufeng-Longmaxi Fm. in Dingshan Area, Sichuan Basin" with high expectation and interest.
I found the researchers have included data sets from 66 samples analysed through various techniques. Though rich in data, the presentation and the language of the manuscript need to be revised. For instance, the title is suffered from grammatical errors; the abstract is supposed to be stand alone, but it is heavily affected by undefined acronyms. It could also be improved by putting one or two sentences which highlight the value of the research.
The keywords would increase the visibility of the work for the search engines, so as expected not to repeat what they stated in the title. Thus it needs a complete rewriting in such a way, they should pick new words or phrases from the body of the manuscript.
The plots of the data set represented with two symbols of black and white fill are not the best ways of data visualization. Had it been done as per the annotated suggestion in the pdf, it would have improved the readability of the manuscript. For instance, in Figure 2 the points may not need to connect with lines. If needed they could do it in the discussion part of the manuscript.
Even though I have given my comments and suggestion to improve the manuscript, I think it needs heavy language editing with an Earth science specialist.
Comments for author File: 
Comments.pdf
Author Response
Dear reviewer:
We thank you greatly for constructive comments which helped us to improve the manuscript. We answered the comments point-by-point in the uploaded pdf. Thank you.
With kind regards,
Corresponding author: Xiaomin Xie
(on behalf of authors)
Author Response File: Author Response.pdf
Reviewer 2 Report
This manuscript investigated the bio-precursor organic matter compositions. 66 samples from a well were tested and the semi-quantitative statistics was conducted. Some relationship between OM composition and TOC content was revealed. This is an interesting investigation and the writing-up is logically organized. This reviewer recommends it for publication with minor revisions or clarifications:
1. Title: Current title is too long and has ‘Fm.’ Word. It is not good.
2. English grammar: The current manuscript has many grammatical errors. Some statements like Line 215-217 have no clear meanings. ‘oil cracking’ (line 290)?
3. Figures: Line figures are of low quality.
Author Response
1. Title: Current title is too long and has ‘Fm.’ Word. It is not good.
Answer: We revised and used formation in the title. The new title is "
The analysis of bio-precursor organic matter compositions and its significance for gas shale reservior of Wufeng-Longmaxi formation from Dingshan Area, Sichuan Basin"
2. English grammar: The current manuscript has many grammatical errors. Some statements like Line 215-217 have no clear meanings. ‘oil cracking’ (line 290)?
Answer: Line 215-217 have been revised as "Compared to the results from Wufeng-Longmaxi intevals from Well YY1 in Guizhou province (Cao et al., 2020), the quantity adsorbed volumes in the study samples were much less than that in Well YY1. "
Line 290, "cracking" was deleted.
We have carefully check others, and made some revisions.
3. Figures: Line figures are of low quality.
Answer: Line figures have been improved.
