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Geology assignment

As you read the article, answer the following questions. Write down your answers. We will address this article and these questions in class, so be prepared to answer and discuss any of these questions!

 

Questions: (some are definitely more important than others…)

 

  1. What does EGSP stand for, and why was the EGSP initiated?

 

 

 

 

  1. And, what were its two (2) main purposes?

 

 

 

 

 

 

  1. Gamma-ray log interpretation is used to locate which units? How so?

 

 

 

 

  1. What’s up with organic-rich, black shales?

 

 

 

  1. What’s their link to natural gas production?

 

 

 

  1. Deeper shales are less attractive as targets – why?

 

 

 

  1. Examine figures 5, 6, and 7 and read. Identify the following for the Marcellus Shale – its age (Time Scale name and numerical date), group name, position in group, basin of deposition.

 

 

 

 

 

 

 

  1. Which limestone units typically bound the Marcellus on bottom and top? Careful with the top one!

 

 

 

  1. Name the three basic subdivisions (members / formations) of the Marcellus, in ascending order. Sketch this basic stratigraphy.

(top)

 

 

 

 

 

 

 

(bottom)

  1. Describe briefly the Union Springs Member.

 

 

 

 

  1. To the (south)west, what happens to this unit? Figure 9 is helpful here also.

 

 

 

  1. How is the “corrosional” (= erosional) feature interpreted depositionally / tectonically?

 

 

 

  1. Describe briefly the Cherry Valley Limestone.

 

 

 

 

  1. In other areas, what name is given to strata that occupy this same horizon?

 

 

 

  1. How extensive is the Cherry Valley and its equivalents?

 

 

 

  1. What lies at the base of the Oatka Creek Member?

 

  1. How is this feature interpreted?

 

 

 

  1. Describe briefly the Oatka Creek Member.

 

 

 

 

  1. What types of fossilized critters occur in the Marcellus? In general, are fossils abundant?

 

 

 

 

  1. What fossil type is used to subdivide Devonian time? Recall from Earth History that these would be considered index fossils…

 

 

 

  1. The Devonian strata of the North American craton reveal what sort of cycles? In general, what do these mean?

 

 

 

 

  1. How many and which particular third-order sequences does the Marcellus Shale represent? Look closely at Figure 10. And, the answer is revealed later…

 

 

 

 

 

  1. What does TST mean?

 

 

 

  1. How about HST?

 

 

 

  1. What does the HST represent?

 

 

 

  1. Deep orshallow…Harper (one of the co-authors) favors what sort of setting for Marcellus deposition? Describe a bit…

 

 

 

 

 

 

  1. Continue by describing the geochemical character of this depositional setting.

 

 

 

 

 

 

  1. Which rocks in the Marcellus represent the HST?

 

 

 

  1. How aretheserocks revealed on wireline logs?

 

 

 

 

  1. What does FSST mean?

 

 

 

  1. How are FSST’s revealed in the Marcellus, and how many are present?

 

 

 

 

  1. LST means what?

 

 

 

  1. How are these revealed in the rock record, and where are they in Marcellus stratigraphy?

 

 

 

 

 

  1. Hah! Go back to Question #16. Now, you can answer it…

 

 

  1. What is the estimated time duration of one of these cycles?

 

 

 

  1. Speculate on the cause(s) of these cycles.

 

 

 

 

 

  1. Synthesis time…On the next page, connect the basic stratigraphy of the Marcellus Shale with sequence stratigraphic nomenclature and interpretation, especially with respect to sea level changes. Be fairly complete (and certainly clear) with this!

 

(top)

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

(bottom)

 

  1. Onward to structure … What is the primary gas-flow pathway in the Marcellus Shale?

 

 

 

 

  1. Success in producing Marcellus gas depends on a couple of key factors. What are these factors?

 

 

 

 

 

 

  1. Folding and faulting is “bad” for Marcellus gas production. Why so?

 

 

 

 

  1. Characterize each of the following: J1, J2, and J3. A small chart / table may work well here. For each, pay attention to orientation, timing of formation, and basic cause.

 

 

 

 

 

 

 

 

 

  1. With respect to these joint sets, describe the scenario for drilling the most successful wells in the Marcellus.

 

 

 

 

 

 

 

  1. Why is this the most successful scenario? Try to integrate information about the contemporary tectonic stress field as well! Draw a little map illustrating this scenario.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

  1. What aspect of this article (covered in this question set or not…) interests you most, and why?

 

 

 

 

 

 

 

 

 

 

  1. What remaining questions about the basics of Marcellus Shale geology do you have?

 

 

 

 

 

 

 

 

 

 

 

 

 

  1. FYI: Go to our class site on D2L and simply check out the series of PDF slide shows (in the Additional Resources module) on aspects of the Marcellus Shale.

Last Updated on October 8, 2019

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