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  1.0 ABSTRACT This experiment was carried out to determine the capacity of oil reservoir by using planimeter on an isopach map.First of all,this experiment was started by measuring the area from the countour lines using planimeter.Isopach means a countour that connects points of equal thickness.Usually the countour lines that make up in isopach map shows the statigraphic thickness of a rock unit opposed to the true vertical thickness.Then,the reading of area from the  planimeter was recorded and plotted into a graph.The values of planimeter can be determined by multiplying the area and depth elevation of the reservoir.Therefore the area under graph is being calculated.Then, total area the under graph represents total volume of the capacity of oil reservoir.The result calculated for total area under the graph is 334.5x10 ⁻⁴  ft acre which shows the volume of the reservoir.This can concluded by using the planimeter and some calculation, the capacity of the reservoir can be determine.    2.0 INTRODUCTION A reservoir rock has permeable and porous rock properties.This properties shows that the reservoir rock contains and trap the hydrocarbon (petroleum). Porous means the interconnected space between the pore spaces in the rock that shows the ability of rocks to store hydrocarbon.Then, permeability means the ability of fluids such as hydrocarbon to flow through the rock. Geologic maps are the most important about rocks and other geologic material of different lithologies and ages over the Earth’s surface or below it. A geologic map or geological map is a special-purpose map made to show geological features. Rock units or geologic strata are shown by color or symbols to indicate where they are exposed at the surface. Bedding planes and structural features such as faults, folds, foliations, and lineations are shown with strike and dip or trend and plunge symbols which give these features' three-dimensional orientations. The geologist measures and describes the rock sections and plots the different formations on a map. Geologic mapping involves plotting the location and attitude of the various rock units, faults, and folds on a base map and its functions are used to investigate geologic hazards, mineral resources, groundwater aquifers, and just plain science.   An isopach map illustrates thickness variations within a tabular unit, layer or stratum. Isopachs are contour lines of equal thickness over an area. Isopach maps are utilized in hydrographic survey, stratigraphy, sedimentology, structural geology, petroleum geology and volcanology. An isopach map displays lines of equal thickness in a layer where the thicknesses are measured  perpendicular to the layer boundaries. Isopach maps in geology are also referred to as True Stratigraphic Thickness (TST) maps. Some functions of isopach maps are to aid in exploration work, to calculate how much petroleum remains in a formation, and to plan ways to recover it. From this map, the  petroleum engineers are able to determine and estimate the volume of the reservoir. This data can be used to determine the available quantity of hydrocarbons in the reservoir.    6.0 PROCEDURES 1) The point on the 0 of circumference lines was marked as a starting point as well as center of tracer lens. 2) Tracer lens of planimeter was placed on the mark and planimeter was on. 3) Tracer was moved in clockwise direction on contour line until it meets at starting point. 4) Memo’ key was pressed and the values was recorded.  5) The step was repeated for 3 times and the experiment was repeated for 50- 250 of circumference lines. 6) The graph of depth versus are was plotted to obtain volume. 7) Volume was obtained by measuring area under the graph.

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Jul 23, 2017
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