Reservoir Geometry Determination and Volumetric Reserve Estimation of an Offshore, Niger Delta Basin Nigeria

2019 ◽  
pp. 1-15
Author(s):  
K. O. Ukuedojor ◽  
G. E. Maju-Oyovwikowhe
Keyword(s):  
Continental Slope ◽  
Water Depth ◽  
Niger Delta ◽  
Gamma Ray ◽  
Well Logs ◽  
Reserve Estimation ◽  
Yield Production ◽  
Reservoir Geometry ◽  
Tertiary Recovery ◽  
Niger Delta Basin

Volumetric reserve estimation had been carried out as well as deducing the reservoir geometry of Idje field. Idje field is an 8.4 km2 area between latitudes 4°31’49”N and 4°33’23” N and longitudes 4°34’43”E and 4°36'17"E offshore Niger Delta in a water depth of approximately 1000 m on the continental slope. Well logs suites from ten wells comprising gamma-ray, resistivity, neutron and density were obtained and analyzed. From the result, it was observed that the reservoir was a sedimentary dome possibly resulting from an underlying shale diaper. The volumetric reserve estimate for the D-3 reservoir shows that it contains 15.8 million barrels of oil and 32 billion cubic feet of gas. If the field is produced at the rate of 10,000 barrels per day, it would yield production for approximately 4 years before subsequent secondary and tertiary recovery measures would be employed.

Evaluation of Reservoir’s Petrophysical Parameters, Niger Delta, Nigeria

2017 ◽  
Vol 5 (1) ◽  
pp. 19
Author(s):  
Ubong Essien ◽  
Akaninyene Akankpo ◽  
Okechukwu Agbasi
Keyword(s):  
Niger Delta ◽  
Gamma Ray ◽  
Water Saturation ◽  
Petrophysical Parameters ◽  
Niger Delta Region ◽  
Average Porosity ◽  
Irreducible Water Saturation ◽  
Open Hole ◽  
Bulk Volume ◽  
Niger Delta Basin

Petrophysical analysis was performed in two wells in the Niger Delta Region, Nigeria. This study is aimed at making available petrophysical data, basically water saturation calculation using cementation values of 2.0 for the reservoir formations of two wells in the Niger delta basin. A suite of geophysical open hole logs namely Gamma ray; Resistivity, Sonic, Caliper and Density were used to determine petrophysical parameters. The parameters determined are; volume of shale, porosity, water saturation, irreducible water saturation and bulk volume of water. The thickness of the reservoir varies between 127ft and 1620ft. Average porosity values vary between 0.061 and 0.600; generally decreasing with depth. The mean average computed values for the Petrophysical parameters for the reservoirs are: Bulk Volume of Water, 0.070 to 0.175; Apparent Water Resistivity, 0.239 to 7.969; Water Saturation, 0.229 to 0.749; Irreducible Water Saturation, 0.229 to 0.882 and Volume of Shale, 0.045 to 0.355. The findings will also enhance the proper characterization of the reservoir sands.

scholarly journals Petrophysical evaluation of reservoir sand bodies in Kwe Field Onshore Eastern Niger Delta

2016 ◽  
Vol 20 (2) ◽  
pp. 383-393
Author(s):  
T.M. Asubiojo ◽  
S.E. Okunuwadje
Keyword(s):  
Niger Delta ◽  
Depositional Environment ◽  
Gamma Ray ◽  
Petrophysical Properties ◽  
System Quality ◽  
Flow Units ◽  
Wireline Logs ◽  
And Performance ◽  
Niger Delta Basin ◽  
Sand Bodies

Reservoir sand bodies in Kwe Field, coastal swamp depobelt, onshore eastern Niger Delta Basin were evaluated from a composite log suite comprising gamma ray, resistivity, density and neutron logs of five (5) wells with core photographs of one (1) reservoir of one well. The aim of the study was to evaluate the petrophysical properties of the reservoirs while the objectives were to identify the depositional environment and predict the reservoir system quality and performance. The study identified three reservoir sand bodies in the field on the basis of their petrophysical properties and architecture. Reservoir A has an average NTG (61.4 %), Ø (27.50 %), K (203.99 md), Sw (31.9 %) and Sh (68.1 %); Reservoir B has an average NTG (65.6 %), Ø (26.0 %), K (95.90 md), Sw (28.87 %) and Sh (71.13 %) while Reservoir C has an average NTG (70.4 %), Ø (26.1 %), K (91.4 md), Sw (25.0 %) and Sh (75.03 %) and therefore show that the field has good quality sandstone reservoirs saturated in hydrocarbon. However, the presence of marine shales (or mudstones) interbedding with these sandstones may likely form permeability baffles to vertical flow and compartmentalize the reservoirs. These reservoirs may therefore have different flow units. Integrating wireline logs and core data, the reservoir sand bodies were interpreted as deposited in an estuarineshoreface setting thus indicating that the Kwe Field lies within the marginal marine mega depositional environment.Keywords: Estuarine, Shoreface, Reservoir, Sand, Kwe, field

scholarly journals Analysis of shaly sand reservoir rocks in the eastern Niger Delta Basin using geophysical well logs

2019 ◽  
Vol 10 (1) ◽  
pp. 1-13
Author(s):  
K. F. Fozao ◽  
Lordon A. E. Djieto ◽  
E. A. A. Ali ◽  
C. M. Agying ◽  
D. M. Ndeh ◽  
...  
Keyword(s):  
Niger Delta ◽  
Well Logs ◽  
Reservoir Rocks ◽  
Shaly Sand ◽  
Geophysical Well Logs ◽  
Niger Delta Basin

Prediction Of Abnormal Pressures In The Niger Delta Basin Using Well Logs

1990 ◽  
Author(s):  
Olubunmi O. Owolabi ◽  
Godwin A. Okpobiri ◽  
Iyalia A. Obomanu
Keyword(s):  
Niger Delta ◽  
Well Logs ◽  
Niger Delta Basin

scholarly journals Depositional Environment and facies analysis of Useni- 1, Niger Delta Basin, using well logs, core data

2019 ◽  
Vol 7 (1) ◽  
pp. 58
Author(s):  
G. O. Aigbadon ◽  
E. O. Akpunonu ◽  
S. O. Agunloye ◽  
A. Ocheli ◽  
O. O .Akakaru
Keyword(s):  
Gamma Ray ◽  
Water Saturation ◽  
Oil Field ◽  
Well Logs ◽  
Depth Range ◽  
Depositional Facies ◽  
Core Data ◽  
Delta Plain ◽  
Niger Delta Basin ◽  
Gamma Ray Log

This study was carried out integrating well logs and core to build reservoir model for the Useni-1 oil field. Core data and well logs were used to evaluate the petrophysical characteristics of the reservoirs. The paleodepositional environment was deduce from the wells and cores data. The depositional facies model showed highly permeable channels where the wells where positioned. The environments identified that the fluvial channel facies with highly permeable zones constituted the reservoirs. Four reservoirs were mapped at depth range of 8000ft to 8400ft with thicknesses varying from 20ft to 400ft. Petrophysical results showed that porosity of the reservoirs varied from 12% to 28 %; permeability from 145.70 md to 454.70md; water saturation from 21.65% to 54.50% and hydrocarbon saturation from 45.50% to 78.50 %. Core data and the gamma ray log trends with right boxcar trend indicate fluvial point bar and tidal channel fills in the lower delta plain setting. By-passed hydrocarbons were identified in low resistivity pay sands D1, D2 at depth of 7800 – 78100ft in the field.  

scholarly journals 3-D Seismic Structural Interpretation of High Field Offshore Western Niger Delta

2021 ◽  
Vol 25 (8) ◽  
pp. 1361-1369
Author(s):  
S.S. Adebayo ◽  
E.O. Agbalagba ◽  
A.I. Korode ◽  
T.S. Fagbemigun ◽  
O.E. Oyanameh ◽  
...  
Keyword(s):  
Niger Delta ◽  
High Field ◽  
Gamma Ray ◽  
Tectonic Setting ◽  
Source Rocks ◽  
Structural Interpretation ◽  
Resistivity Logs ◽  
Seismic Sections ◽  
Niger Delta Basin ◽  
Structural Closure

Seismic Structural interpretation of subsurface system is a vital tool in mapping source rocks and good trapping system which enhances good understanding of the subsurface system for productive drilling operation. This study is geared towards mapping the structural traps available within the hydrocarbon bearing zones of the “High field” with the use of well log and 3D seismic data. Seven horizons (H1, H2, H3, H4, H5, H6 and H7) were identified on well logs using gamma ray log and resistivity logs. Nine (9) faults were mapped on seismic sections across the field, two (2) of which are major growth faults (F1 and F2), two (2) synthetic faults (F3 and F7) and five (5) antithetic faults (F4, F5, F6, F8 and F9). Rollover anticlines which are structural closure and displayed on the depth structural maps suggest probable hydrocarbon accumulation at the down throw side of the fault F1. Structural interpretation of high field has revealed a highly fault assisted reservoir which depicts the tectonic setting of Niger Delta basin.

scholarly journals Geological Evaluation of Hydrocarbon Prospect of FOB-field, Coastal Swamp Depobelt, Onshore, Niger Delta Basin, Nigeria

2019 ◽  
pp. 1-12
Author(s):  
Frankie O. Balogun ◽  
Franklin A. Lucas ◽  
Osarodion Ebomwonyi
Keyword(s):  
Late Miocene ◽  
Niger Delta ◽  
Seismic Facies ◽  
Well Logs ◽  
Environment Model ◽  
Multidisciplinary Data ◽  
Sedimentary Succession ◽  
Sequence Boundaries ◽  
Niger Delta Basin ◽  
Geological Position

Well logs, biostratigraphic data, seismic data and semblance map which together form a multidisciplinary data approach, were utilized in the geological evaluation of hydrocarbon prospect FOB-Field, onshore Coastal Swamp Depobelt in the Niger Delta Basin. Structural interpretation of faults, correlation of wells and 3D seismic interpretation were carried out using Schlumberger’s window based petrel software integrated with various lines of evidence such as sequence boundaries and maximum flooding surfaces. The penetrated sedimentary succession was established to constrain the alternation of sand packages from proximal to distal. The studied wells were dated mid to late Miocene based on the geological position of the sequence boundary (10.35Ma) and geological ages of the Mfs (9.5MaMfs) and (10.4MaMfs) respectively corresponding to the Coastal Swamp Depobelt of the Niger Delta Basin. Integration of well logs, seismic, semblance, paleobathymetric and biostratigraphic data indicated mid to late Miocene and neritic to bathyal paleoenvironment of deposition. Integration of fault integrity, seismic, well logs and key stratigraphic markers were utilized to build a seismic facies model and a gross depositional environment model for the FOB-Field.

scholarly journals Evaluation of Petrophysical Parameters of Reservoir Sand Wells in Uzot-Field, Onshore Niger Delta Basin, Nigeria

2021 ◽  
Vol 25 (2) ◽  
pp. 157-171
Author(s):  
UC Omoja ◽  
T.N. Obiekezie
Keyword(s):  
Niger Delta ◽  
Gamma Ray ◽  
Depth Range ◽  
High Hydrocarbon ◽  
Hydrocarbon Production ◽  
Petrophysical Parameters ◽  
Resistivity Logs ◽  
Hydrocarbon Saturation ◽  
Niger Delta Basin ◽  
Sand Bodies

Evaluation of the petrophysical parameters in Uzot-field was carried out using Well log data. The target for this study was the D3100 reservoir sand of wells Uz 004, Uz 005, U008 and Uz 011 with depth range of 5540ft to 5800ft across the four wells. Resistivity logs were used to identify hydrocarbon or water-bearing zones and hence indicate permeable zones while the various sand bodies were then identified using the gamma ray logs. The results showed the delineated reservoir units having porosity ranging from 21.40% to 33.80% indicating a suitable reservoir quality; permeability values from 1314md to 18089md attributed to the well sorted nature of the sands and hydrocarbon saturation range from 12.00% to 85.79% implying high hydrocarbon production. These results suggest a reservoir system whose performance is considered satisfactory for hydrocarbon production. Keywords: Petrophysical parameters, porosity, permeability, hydrocarbon saturation, Niger Delta Basin

Prediction Of Abnormal Pressures In The Niger Delta Basin Using Well Logs

10.2118/90-75 ◽  
1990 ◽  
Author(s):  
O.O. Owolabt ◽  
G.A. Okpobiri ◽  
L.A. Obamanu
Keyword(s):  
Niger Delta ◽  
Well Logs ◽  
Niger Delta Basin
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