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International Journal of Basic Science and Technology

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Archive | ISSUE: 115, Volume:4 Apr-Jun-2018

Petrophysical Analysis of Reservoirs at Etsako Field, Niger Delta Basin Nigeria, Using Open Hole Geophysical Logs


Author:Tokurah, M. ,Shuaibu, A.M.

published date:2018-Dec-31

FULL TEXT in - | page 86 - 98

Abstract

This research focused on petrophysical aspects of reservoirs within Etsako-Field, Niger Delta Basin, Nigeria using open hole geophysical well logs. The study area is about 1.22km2 and lies approximately within latitudes 5o 4ʹ 8˝N and 50 6ʹ 5˝ N and longitudes 604ʹ6˝ E and 60 7ʹ6˝ E. The study was conducted to update petrophysical estimates of Etsako-Field using techniques of sequence stratigraphy. Petrophysical evaluation is commonly conducted using effective porosity estimated from equation that is not time sensitive. Hydrocarbon saturation values estimated using such equations will be erroneous. Porosity estimates in the reservoirs ranges from 0.168 to 0.2466. Estimated hydrocarbon saturation ranges from 0.534 to 0.620 in the hydrocarbon reservoirs. Drilling should be concentrated on infill wells between ET-6 and ET-3, ET-3 and ET-1 which will result to increase volume of hydrocarbon in reservoir sand-I. Infill wells drilled between well ET-6 and ET-3, ET-3 and ET-1 will also increase productivity from reservoir sand-F2, Sand-B and Sand-M. Drilling should be avoided between ET-2 and ET-5; they will produce only water. Further exploration should focus on the Lowstand Systems (LST) Tracts because most of the producible hydrocarbon accumulations are found within the LST in the field.

Keywords: Hydrocarbon saturation, Petrophysical properties, Reservoirs, Water saturation ,

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