Abstract
An hydrocarbon reservoir was characterized via a detailed geologic model, which allowed estimation of the original oil in place. The study characterizes a hydrocarbon reservoir of two fields of unit C7 of the Carbonera Formation within the Llanos Orientales basin of Colombia. This was done using well logs, the structural surface of the regional datum of the area, segments of the Yuca fault and a local fault of the reservoir, the permeability equation, and J functions of the reservoir provided by the operating company. With this information, a two-fault model and a grid with 3D cells was created. Each cell was assigned with a value of facies and petrophysical properties: porosity, permeability, and water saturation, to obtain a 3D model of facies and petrophysical properties. Subsequently, we used the constructed models and oil-water contacts to calculate the original oil in place for each field. Field 1 has a volume of six million barrels of oil and field 2 has 9 million barrels.
Highlights
The Llanos Orientales is one of the most important oil basins in Colombia
An hydrocarbon reservoir was characterized via a detailed geologic model, which allowed estimation of the original oil in place
These samples are studied to determine the lithology of the drilled formation and the cores are subjected to laboratory tests for direct measurement of the petrophysical properties of the formation, such as porosity and permeability
Summary
The production of hydrocarbons and economic profitability of the development of fields in this basin have contributed to the country’s energy supply For this reason, it is essential for the oil industry to determine the volume of hydrocarbons in a reservoir. Direct methods consist of core sampling and drill cuttings, corresponding to the extracted rock These samples are studied to determine the lithology of the drilled formation and the cores are subjected to laboratory tests for direct measurement of the petrophysical properties of the formation, such as porosity and permeability. Indirect methods consist of quantitative measurements of formation properties These include electric well logs of gamma rays, density, and resistivity, using a sensor and receiver. The main objective of the present work was to calculate the original oil in place (OOIP) from the geological modeling of a reservoir in two fields, with interest in unit C7 of the Carbonera Formation in the Llanos Orientales basin.
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