UGA GEOL 4320-6320 - 4320ExamLecture02 (3 pages)

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4320ExamLecture02



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4320ExamLecture02

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3
School:
University of Georgia
Course:
Geol 4320-6320 - Petroleum Geology
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GEOL 4320 6320 Lecture Exam November 10 2011 Draft of October 31 2011 Three to six of the following questions will account for at least 85 of the points on a closed note closed book 75 minute exam You will be expected to answer every question that is asked on the exam so that you are responsible for all of the following questions Questions 26a and 37 were added to the draft of October 23 2011 1 What are to date the depths of the world s deepest onshore petroleum well the world s deepest offshore petroleum well and the world s deepest well of any sort Rounding to multiples of 5000 feet is acceptable for these answers Where was each drilled 2 What solutes are typically most abundant in the deep waters of the sedimentary basins Put a star next to the one that is typically most abundant 3 What are the three mechanisms that make the bit turn at the bottom of boreholes drilled in the early Twenty first Century 4 What is or are the role or roles of drilling mud in the drilling of a petroleum borehole 5 What kinds of blowout preventers are used in drilling petroleum boreholes Sketch the external appearance of a set of them and label the two principle kinds that should be evident 6 Explain the differences between drilling pipe drilling riser casing and tubing 7 What kinds of drilling mud have been and or are presently used in drilling petroleum boreholes 8 What is the relevance of the existence and kind of drilling mud used in a particular borehole to a geoscientist who years later has no physical connection to the drilling of that borehole 9 What is overpressure and why should a geoscientist care 10 What information typically appears on a mud log 11 What process and or measurement does the logging tool do in generating a log and what lithologic characteristic s do we think the log tells us 12 As you hand your completed exam to the instructor in the hallway say the name of the oldest and most internationally recognizable well logging company 13 What can be the cause of missing section in the logs of a borehole 14 Petroleum can be divided into five categories of organic compounds For each give the name and sketch a representative or small typical structure Put a star next to the two that are most abundant in most crude oils 15 What are the two more or less scientific explanations of the origin of petroleum and what lines of evidence support each 16 Envision a body of organic rich sediment that is deposited on the sea floor and subsequently buried to great depth At what stages as defined by depth and or temperature and or time in its history are hydrocarbons emitted from such a sediment and what is their chemical nature 17 What does Rock eval do what does it report and what can be inferred from it 18 What is API gravity and what other characteristics of petroleum are commonly correlative with it 19 Sketch a typical whole oil gas chromatogram labeling the axes and indicating the significance of the peaks 20 What is primary migration and how does it happen 21 What kinds of rocks commonly function as seals for petroleum accumulations and why do they do so 22 What determines at the most fundamental level whether a particular stratum functions as a seal or as a migration pathway for a particular accumulation of petroleum 23 What determines whether a fault functions as a seal or as a migration pathway for petroleum 24 Define porosity and explain how geoscientists commonly quantify it 25 Make a table showing a classification of porosity by its relationship to rock fabric and to its time of origin 26 What is the porosity of a typical moderately sorted sand What range of porosity is found in petroleum reservoir rocks What accounts for the difference between the first answer and the second 26a What parameters control the porosity of a siliciclastic sand or sandstone and how does porosity typically vary with each You can make a two column table with controlling parameter on left and trend in porosity on the right but make sure that the relationship between parameter and trend is explicit and clear e g Porosity decreases with increasing X or Porosity less in sands with greater Y 27 What kind of porosity is most commonly envisioned by explorationists or by their less than thoroughly geologically aware management as the principle residence of hydrocarbons in petroleum accumulations 28 What is permeability by what unit or units do geoscientists commonly quantitatively measure it and what are typical quantitative values of permeability in reservoir rocks 29 The attached diagram shows the results of mercury injection tests of three reservoir rocks Which is the curve for the most permeable reservoir rock Explain why you make that inference from that curve 30 Make one micro scale sketch of grains and fluids in a petroleum reservoir before its exploitation and one of the same afterwards Subdivide the fluids to the maximum extent possible 31 Make a large scale sketch of a petroleum reservoir showing the locations of different fluids and labeling all of the relevant features 32 Make a list of categories of trapping mechanisms listing subsets where appropriate Put a star a five pointed figure next to the most common category and put an asterisk a six to eight pointed figure next to the most abundant subset of at least one category 33 Define or explain the concept of the petroleum system 34 What are the relative thermal conductivities of various siliciclastic sedimentary rocks carbonate rocks and salt halite and why is this of interest to petroleum geoscientists 35 When given a seismic section or map what questions should a geoscientist ask about that section or map before beginning to interpret it 36 Explain using a sketch or sketches what goes into generating a single vertical seismic trace on a seismic section 37 Make a sketch of what a gas bearing petroleum accumulation trapped in an anticline would look like in a black and white seismic presentation you don t need to sketch individual traces just the lighter and darker areas or lines Then make the same sketch for a modern American style color presentation if you don t have pencils or pens of the appropriate colors just use two different shadings and label what color each represents Then make the same sketch for a modern European style color presentation again if you don t have pencils or pens of the appropriate colors just use two different shadings and label what color each represents but be consistent with the scheme that you used for the American style


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