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PROJECT TOPIC- RESERVOIR CHARACTERIZATION AND VOLUMETRIC ANALYSIS OF “LONA” FIELD, NIGER DELTA, USING 3-D SEISMIC AND WELL LOG DATA

PROJECT TOPIC- RESERVOIR CHARACTERIZATION AND VOLUMETRIC ANALYSIS OF “LONA” FIELD, NIGER DELTA, USING 3-D SEISMIC AND WELL LOG DATA

 

ABSTRACT

An integrated 3-D seismic data, checkshot data and a suite of four well log located at the Lona field, Niger Delta were analysed with Petrel software for reservoir characterization and volumetric analysis of the field. The method adopted involves petrophysical analysis, structural analysis, volumetric
analysis and reservoir classification. Detailed petrophysical analysis revealed three reservoirs.Average reservoir parameters such as porosity (0.25), gross thickness (27 m), hydrocarbon saturation (0.66)permeability (3734 md) and netgross (0.54) were derived from the petrophysical analysis. Structural analysis of the data showed fault assisted anticlinal structures which serve as structural traps that prevent the leakage of hydrocarbon
from the reservoirs. The analysis of the all the well sections revealed that each of the sand units extends through the field and varies in thickness with some unit occurring at greater depth than their adjacent unit that is possibly an evidence of faulting. The shale layers were observed to increase with depth along with a corresponding decrease in sand layers. From the analysis, particularly the resistivity log, all the three delineated reservoirs were identified as hydrocarbon bearing units across the four wells i.e Lona1, Lona2, Lona3 and Lona4.Volumetric study of the hydrocarbon in place shows that the reservoirs are of appreciable areas and thicknesses. The volume of hydrocarbon originally in place was estimated to be 550 thousand barrels of oil. The three reservoirs have been classified using average results of petrophysical parameters. And based on these, R1 is said to be the most prolific while R2 is the least prolific within Lona field.

CHAPTER ONE
INTRODUCTION

1.1 Background

The prolific demand for hydrocarbon products since the 20th century prompted intensified exploration for oil and gas accumulation in reservoir rocks. This led to an extensive study of the Niger Delta depocenters after a long while of non-productive search in the Cretaceous sediments of the Benue Trough (Doust, 1989; Doust and Omatsola, 1990). Understanding of reservoir characteristicsmost importantly porosity, permeability, water saturation thickness and area extent of the reservoir are crucial factorsing quantifying producible hydrocarbon (Schlumberger, 1989). These parameters are important because they serve as veritable inputs for reservoir volumetric analysis i.e. the volume of hydrocarbon in place (Edward, 1990).
Petroleum in the Niger Delta is produced from sandstone and unconsolidated sands predominantly in the Agbada formation. It is necessary to delineate the hydrocarbon reservoirs and evaluate them because they are the zones of interest for hydrocarbon exploitations (Adewoyeet al., 2013).Based on reservoir geometry and quality, the lateral variation in reservoir thickness is strongly controlled by growth faults; with the reservoirs thickening towards the fault within the down-thrown block (Weber and Daukoru, 1975). It is therefore neccessary to use technologically and economically viable methods in the exploration and exploitation for hydrocarborn because geophysical survey and the subsequent exploitation via drilling of wells require large capital.In order to avert any loss or wastage of resources, there is need to properly and adequately characterise a reservoir and to determine the hydrocarborn in place. This will help to ascertain the hydrocarbon potential of the reservoirs.

PROJECT TOPIC- RESERVOIR CHARACTERIZATION AND VOLUMETRIC ANALYSIS OF “LONA” FIELD, NIGER DELTA, USING 3-D SEISMIC AND WELL LOG DATA

 

The objectives of this work are to make detailed use of available wireline log data to delineate the reservoir units of the wells in parts of the Niger Delta, calculate the petrophysical properties of the reservoir rocks, and infer the reservoir geometry distribution and reservoir quality trends using the reservoir correlation. This study will provide an understanding of the reservoir properties, and their lateral variation in thickness.

1.2 Purpose of study

The purpose of this study is to characterize the reservoirs and determine the hydrocarbon in place in the study area. This is achieved by
i. Identification of the reservoirs and estimating the petrophysical parameters from the well logs,
ii. generating time and depth structure of mapped horizons from structural analysis,
iii. carrying out a volumetric analysis in order to estimate the hydrocarbon in place.

1.3 Location of the study area

PROJECT TOPIC- RESERVOIR CHARACTERIZATION AND VOLUMETRIC ANALYSIS OF “LONA” FIELD, NIGER DELTA, USING 3-D SEISMIC AND WELL LOG DATA

 

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