Correction Exam

Mid-Term Examination (1 hour) 1) Define geology and give the name of the three (03) layers that compose the earth structure. * Geology is the science that deals with the history and structure of the earth and its life forms, especially as recorded in the rock record. * the core, the mantle, and the crust.

2) What are the principal rocks type, which one of them is the most important for the petroleum industry and why? *Igneous rocks, Metamorphic rocks and Sedimentary rocks * Sedimentary rocks are the most important one because most oil and gas accumulations occur in them. 3) What are the three (03) principles on which the relative time scale is base on? *principle of original horizontality, principle of superposition and the principle of cross-cutting relationships 4) What are the five (05) types of sedimentary rocks that are important in the production of

hydrocarbons? *Sandstones, carbonates (limestone and dolomites), shales and evaporates. 5) What is a source rock and give an example of a rock that can be a source rock? * Source rock refers to the formation in which oil and gas originate. *Shales 6) What is primary migration?

*Primary migration is the process by which petroleum moves from source beds to reservoir rocks. 7) A fluid with a API gravities of 20 to 40 degrees ( or specific gravity of 0.83 to 0.93) is

consider as light, normal or heavy oil ? * normal oils. 8) Give four (04) majors hydrocarbons gases with their formula. * methane (CH4 ), ethane (C2H6), propane (C3H8), and butane (C4H10). 9) What is a reservoir rock and give an example of a rock that can be a reservoir rock? *A reservoir is a subsurface volume of porous and permeable rock that has both storage capacity and the ability to allow fluids to flow through it. * carbonates

10) Name the different type of structural trap. *Anticlinal, Salt Dome and Fault Traps 11) what are the different type of well logging and which types of information can we obtain from each of them? * open hole logging (porosity, permeability, lithology…) and cased hole logging ( flow rate, pressure, fluid types…)