GEOL 404 E1 QUIZZES QUESTIONS ANSWERED CORRECTLY LATEST UPDATE 2026

GEOL 404 E1 QUIZZES QUESTIONS ANSWERED CORRECTLY LATEST UPDATE 2026 The ultimate objective of studying petroleum geology is - Answers to use geology to find petroleum in the subsurface Which of thew following resources is the easiest to develop? - Answers sandstone reservoirs Which of thew following resources is the most difficult to develop? - Answers Oil shales A sweet spot means ______________. - Answers one of the most productive areas Petroleum exploration needs huge up-front capital investment and has great risk of drilling dry holes which could lead to business failure. Risk analysis in petroleum geology to reduce such risks has the following five components: - Answers source rock, reservoir rock, structural trap, seal and timing The four levels of petroleum investigation proceed in the following order: - Answers Sedimentary basin, petroleum system, play, prospect Plate tectonics is important in petroleum system analysis, because it helps to determine ________. - Answers sedimentary basin types, source property, reservoir types and structure types To know the "Period" names and times of the Pahanerozoic is very important because ______________. - Answers the knowledge of the stratigraphic column is needed to calibrate the occurrence of the five system elements including the critical "timing". In which Period have the most oil and gas reserves been discovered so far? - Answers Cretaceous ______________ is mostly composed of granites, related igneous and metamorphic rocks, as well as sedimentary rocks. - Answers continent crust ___________ is thicker than __________. _______ is denser than ______. - Answers continent crust, oceanic crust; oceanic crust, continental crust Higher a mountain, shallower its root. - Answers False Passive margins are usually formed during the stage of _____ in Wilson cycle. - Answers sea floor speading Foreland basins are usually formed during the stage of _____ in Wilson cycle. - Answers Continental Collision Rocks tend to be more ductile as depth increases to the lower part of the crust or the upper mantle because _______. - Answers both temperature and pressure increase Sandstone usually has more fractures and faults than shale because ____ - Answers shale is more ductile than sandstone Normal faults are produced by _____ - Answers tensional stress For conventional hydrocarbon exploration, oil/gas reserves are trapped in __________. - Answers anticlinal structures instead of synclinal ones For unconventional hydrocarbon exploration, oil/gas reserves are trapped in __________. - Answers synclinal structures instead of anticlines Under what condition may a fault not be a good seal for fluid migration? - Answers The region has active tectonic activity. Which of the following structures is the best to hold hydrocarbons? - Answers open upright fold which gives you the true vertical depth of subsurface formations? - Answers Structural cross-section Which gives you a true stratigraphic thickness map of a subsurface formation? - Answers Isopach map Net pay is always ________________ gross pay. - Answers less than Coarse-grained sand is deposited in _____________ environment. - Answers high energy Clay is deposited in _____________ environment. - Answers low energy limestone is formed from calcite ______________. - Answers transported by water and precipitaed organically from solution. Shale is formed from clay ______________. - Answers transported by water as mineral grains. Permeability is affected strongly by _________. - Answers porosity and grain size as well as sorting Shale can be formed in _____________. - Answers continental environments shoreline enviroments marine environments (All the above) Limestone can be formed in ______________. - Answers marine environments A 2-meter interval of cores from a drilled well contains an interbedded coal. What is the depositional environment in which this interval of rocks was deposited most likely? - Answers continental environments Conglomerates are deposited in _________. - Answers continental environments Channel bars are formed in _________ whereas point bars in _____. - Answers braided stream systems; meandering river systems Conductivity of the formation in an uninvaded zone increases _________. - Answers as the conductivity of the formation water, water saturation and porosity increase Conductivity of the formation in an invaded zone increases _________. - Answers as the conductivity of the mud filtrate, mud filtrate saturation and porosity increase Sxo measures the mud filtrate saturation in the invaded zone which is ____________________, whereas Smo is _________. - Answers water and movable hydrocarbon; movable hydrocarbon Mudcake is one of the four important zones in borehole environment. In which formation do expect thick layer of mudcake on the borehole wall? - Answers porous sandstone When you measure the conductivity of a solution in a container, you find its conductivity is very high, which lead yo to conclude: The most favorable scenario is that ___________. - Answers its salinity is high and temperature is high What is the most important property of a reservoir rock? - Answers high porosity Identify the 4 attributes necessary for a petroleum system - Answers source rock, seal rock, reservoir rock, trap/closure What is the most important property of a seal rock? - Answers low permeability sedimentary rocks formed from the weathering and erosion of pre-existing rocks - Answers detrital/ clastic sedimentary rocks are formed from the accumulation of biological material—such as shells, skeletons, or organic remains—produced by living organisms - Answers organic/ biogenic sedimentary rocks form by the direct precipitation of minerals from solution - Answers chemical / inorganic Which of the following options is not a characteristic of mudrock? Composed predominantly of clay minerals and quartz Mud-sized particles 1 mm Can be rich in organic material Deposited in quiet depositional environment - Answers Mud-sized particles 1 mm Parallel and Massive bedding are indicative of which depositional environment energy? - Answers Low-energy environment