Abstract
AbstractCapillary pressure is an important characteristic that indicates the zones of interaction between two-phase fluids or fluid and rock occurring in the subsurface. The analysis of transition zones (TZs) using Goda (Sam) et al.’s empirical capillary pressure from well logs and 3D seismic data in ‘Stephs’ field, Niger Delta, was carried out to remove the effect of mobile water above the oil–water contact in reservoirs in the absence of core data/information. Two reservoirs (RES B and C) were utilized for this study with net thicknesses (NTG) ranging from 194.14 to 209.08 m. Petrophysical parameters computed from well logs indicate that the reservoirs’ effective porosity ranges from 10 to 30% and the permeability ranges from 100 to > 1000 mD, which are important characteristics of good hydrocarbon bearing zone. Checkshot data were used to tie the well to the seismic section. Faults and horizons were mapped on the seismic section. Time structure maps were generated, and a velocity model was used to convert the time structure maps to its depth equivalent. A total of six faults were mapped, three of which are major growth faults (F1, F4 and F5) and cut across the study area. Reservoir properties were modelled using SIS and SGS. The capillary pressure log, curves and models generated were useful in identifying the impact of mobile water in the reservoir as they show the trend of saturating and interacting fluids. The volume of oil estimated from reservoirs B and C without taking TZ into consideration was 273 × 106 and 406 × 106 mmbbls, respectively, and was found to be higher than the volume of oil estimated from the two reservoirs while taking TZ into consideration which was 242 × 106 and 256 × 106 mmbbls, respectively. The results have indicated the presence of mobile water, which have further established that conventionally recoverable hydrocarbon (RHC) is usually overestimated; hence, TZ analysis has to be performed for enhancing RHC for cost-effective extraction and profit maximization.
Publisher
Springer Science and Business Media LLC
Subject
General Energy,Geotechnical Engineering and Engineering Geology
Reference23 articles.
1. Abiola O, Olowokere MT, Ojo JS (2018) Sequence stratigraphy and depositional sequence interpretation, a case study of “george” Field Offshore Niger Delta, Nigeria. J Pet Res 3:25–32
2. Christiansen RL (2001) Two-phase flow through porous media: theory, art and reality of relative permeability and capillary pressure. Petroleum Engineering Department, Colorado School of Mines, Colorado
3. Doust H, Omatsola E (1990) Niger-Delta. In: Edwards JD, Santogrossi PA (eds) Divergent/passive margins basins: AAPG Memoir, vol 48, pp 201–238
4. Glover P (2000) Saturation and capillary pressure. Unpublished Lecture Note, chap 4, pp 1–23
5. Goda (Sam) H, PetroPerth Consulting SPE, Behrenbruch P (2011) A Universal formulation for the prediction of capillary pressure. University of Adelaide. SPE 147078. Copyright 2011, Society of Petroleum Engineer, pp 1–22
Cited by
3 articles.
订阅此论文施引文献
订阅此论文施引文献,注册后可以免费订阅5篇论文的施引文献,订阅后可以查看论文全部施引文献