Sequence stratigraphic approach to hydrocarbon exploration: a case study of Chiadu field at eastern onshore Niger Delta Basin, Nigeria

Nwaezeapu, Victor Cypren; Okoro, A.U.; Akpunonu, Elesius O.; Ajaegwu, N. E.; Ezenwaka, Kingsley; Ahaneku, Chibuzo Valeria

doi:10.1007/s13202-017-0405-4

Cited by 7 publications

(5 citation statements)

References 12 publications

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“…The ancient redox conditions are mainly related to the content of free oxygen in the lake water, and the redox properties of the water are mainly characterized by the ratio of V/(V + Ni), Ni/Co and U/Th elements (Flemming, 2000; Nwaezeapu et al, 2018). The V/(V + Ni) ratios of this sample all ranged from 0.69 to 0.76, with an average of 0.73.…”

Section: Resultsmentioning

confidence: 99%

“…In the sequence framework, fine‐grained sediments often develop in the transgressive system tract (TST) or the early highstand system tract (LHST) and have different differences in different system tracts. The lithofacies characteristics (Cather et al, 2021; Lapidus, Kerimov, Mustaev, Movsumzade, & Zakharchenko, 2018; Leven, 2013; Nwaezeapu et al, 2018; Zhang, Bai, Jin, & Wang, 2016). Hemmesch, Harris, Mnich, and Selby (2014) studied the distribution characteristics of the minerals and lithofacies of the Woodford Shale in the Permian Basin and found that the high stand system tract (HST) developed mudstone and carbonate interbeds, and the TST developed organic‐rich shale (Hemmesch et al, 2014).…”

Section: Introductionmentioning

confidence: 99%

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The heterogeneity of lithofacies types, combination modes, and sedimentary model of lacustrine shale restricted by high‐frequency sequence

Sun

Liu

et al. 2022

Geological Journal

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The second Member of the Funing Formation in the Haian Sag of the Subei Basin is a set of organic-rich fine-grained sedimentary rocks, which is a key interval for shale oil exploration. Under the premise of establishing a high-frequency sequence framework, the fine description of the lithofacies change characteristics of the continental fine-grained sedimentary rocks is the basis for the prediction of shale oil favourable areas and the optimization of the production horizons. This study is established through wavelet transformation of the natural gamma curve of the high-frequency sequence framework of the second Member of the Funing Formation, using thinsection observation, total organic carbon analysis, and X-ray diffraction experiments to study the lithofacies types and characteristics of fine-grained sedimentary rocks, and discuss the combination of lithofacies under the high-frequency sequence framework Mode and influencing factors. The results show that the second Member of Funing Formation is composed of three-level sequence of low-level system tract (LST), transgressive system tract (TST), and early high-level system tract (EHST), corresponding to 6 fourth-level sequences and 10 fifth-level sequences. According to the division scheme of "abundance of organic matter + mineral composition + sedimentary structure", it is found that 12 types of lithofacies were developed in the fine-grained sedimentary rocks of the second Member of Funing Formation. The lithofacies type is affected by the palaeoenvironment. The organic matter facies are mainly controlled by palaeo-water depth and palaeo-redox conditions, the components are mainly controlled by palaeo-water depth and palaeo-salinity, and the tectonic facies are mainly controlled by palaeo-redox and palaeo-salinity. The lithofacies are regularly superimposed in the high-frequency sequence framework, and three combination modes of A, B, and C are developed. Among them, the type A lithofacies are developed in the low-stand system tract, and the type B lithofacies are developed in the transgressive system. The C-type lithofacies assemblage developed near the largest flooding surface and the early highstand system tract, and combined with palaeoenvironment analysis to establish a lithofacies sedimentary model.

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

The heterogeneity of lithofacies types, combination modes, and sedimentary model of lacustrine shale restricted by high‐frequency sequence

Sun

Liu

et al. 2022

Geological Journal

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“…At the same time during recent years new approaches to the use of the sequence-stratigraphy method have been proposed by many researchers (Abd Al-Salam Al-Masgari et al, 2021;Ainsworth, 2010;Miller et al, 2018;Nwaezeapu et al, 2018;Okpikoro and Olorunniwo, 2010;Zhu et al, 2013). In the work by Abd Al-Salam Al-Masgari et al, sequence-stratigraphic research was carried out mainly on the basis of seismic data.…”

Section: Literature Reviewmentioning

confidence: 99%

“…One more new sequence-stratigraphy approach was suggested by Nwaezeapu et al According to this approach, the high-resolution biostratigraphy, analysis of logging diagrams and interpretation of seismic data are three major components making up the sequence-stratigraphy. All these data were analyzed and combined in order to decrease the uncertainty during correlation and mapping of sequences and system tracts (Nwaezeapu et al, 2018).…”

Section: Literature Reviewmentioning

confidence: 99%

Sequence stratıgraphıc analysıs of the Galmaz field based on well loggıng data

Seidov¹,

Khalilova²

2023

Journ. Geol., Geogr., and Geoec..

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It is known that over 90% of oil, gas and gas condensate in Azerbaijan is produced from Productive Series (PS) of the Early Pliocene. In this respect, the detailed study of Pro- ductive Series deposits and their evolution conditions has a special value. Currently in most sedimentary basins of the world the latest highly informative methods of stratigraphic analysis are applied and one of these methods is sequence-stratigraphy, which is used in this study. The application of the concept of sequence stratigraphy enables an in-depth analysis of the study area to be conducted from a geological point of view. Despite the fact that the search for oil and gas deposits in the basins of Azerbaijan Republic has been going on for many years, there is a limited understanding of the distribution of elements associated with the oil system within the sequence stratigraphic structure. This is evidenced by the small number of scientific publications that exist in this area at the moment. To study in more detail the sedimentation process of PS of the Pliocene in the Galmaz field the genetically tied facies have been outlined and correlated within the framework of chronostratigraphic boundaries. As the study targets we have chosen the stages of Absheron, Akchagyl and PS of Pliocene in the Galmaz field. New data acquired by well logging techniques were re-examined in detail. To analyze and interpret the data , NeuralogTM and PetrelTM software were applied. From positions of the sequence-stratigraphy and taking into account the curve features (gamma ray log) predictions of the sedimentation environment of PS have been made. In the study process the sequences and system tracts have been outlined and studied, the sedimentation periods of the outlined sequences have been defined. It has been suggested to apply stratigraphic surfaces for tracing changes in regression and transgression surfaces. Clay and sand fractions of rocks were evaluated with further lithological analysis. On the gamma-ray curves, the intervals with intensity values less than 3.5 mR/h were considered as reservoir layers. At the same time, the normalized value of αSP, calculated from the curve of Spontaneous Polarization, was assumed to be greater than 0.6. Based on the sequence-stratigraphy analysis of oil-field geophysical data it has been established that the geological section of the Galmaz area was developing at various rates and in frequently changing energy mode. It has been also made clear that parasequences of the Absheron stage and Productive Series were formed in progradation mode by detritus brought by river flows. Akchagyl sediments play the role of the regional major cap in the basin.

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“…Nwaezeapu et al presented that the electrofacies established on well logs correlate well with the sedimentary facies from core analysis, and the electrofacies established on well logs can be used to directly interpret the pale environments of the well formation [14].…”

Section: Well Log Facies Analysis and Associated Depositional Environmentioning

confidence: 99%

Prediction of Reservoir Performance of Moby Field, Niger Delta Basin using Integrated Facies and Petrophysical Analyses

KC¹,

II²,

VC³

et al. 2018

J Pet Environ Biotechnol

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To effectively predict reservoir performance, and make proper reservoir managements within the depleting Moby field, Niger Delta Basin of Nigeria, the effect of facies changes on reservoir quality has been studied. Well log and 3-D seismic facies analyses were used to determine the depositional facies within the study area, and have shown how the facies changes affect the petrophysical properties of the reservoirs. The facies analysis from the well log showed five subfacies environments and three facies associations. The identified subfacies include; up bar distributary channel subfacies (UD), distributary mouth bar subfacies (DM), intertidal subfacies (IT), sub tidal subfacies (ST), and Storm dominated shelf subfacies (SD). The UD and DM subfacies belong to the delta front facies association, the IT and ST subfacies are of Tidal flat facies association, while the SD subfacies is associated to the Shore face facies. Continuous high and low amplitude (D-facies), high amplitude convergent (CBH-facies), high and low amplitude convergent (CBHL-facies), and low amplitude discontinuous, shingled to chaotic (BLfacies) all make up the four identified seismic facies. The D-seismic facies correspond to the Delta front facies, CBHL-seismic facies correspond to the sub tidal subfacies, and CBH-seismic facies are of the intertidal subfacies, while the BL-seismic facies correspond to the storm dominated shelf facies. Calculation of the sand percentages for the seismic facies show that the D-seismic facies has the highest reservoir percentage, and is ranked highest than the other seismic facies identified. The paleoenvironment of the Moby field was therefore inferred to be marginal to shallow marine environments. Nine reservoirs (H1-H9) were identified from qualitative petrophysical analysis. The H1 and H2 reservoirs are deposits of the delta front facies, the H3-H6 reservoirs are deposits of the intertidal subfacies, while the H7-H9 reservoirs are deposits of the sub tidal subfacies. Quantitative Petrophysical analysis of the reservoirs shows that H1 and H2 reservoirs possess the best petrophysical properties. This is followed by that of the H7-H9 reservoirs, and lastly the H3-H6 reservoirs. The variations in petrophysical properties of the reservoirs within the study area are associated with different depositional conditions and settings.

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Sequence stratigraphic approach to hydrocarbon exploration: a case study of Chiadu field at eastern onshore Niger Delta Basin, Nigeria

Cited by 7 publications

References 12 publications

The heterogeneity of lithofacies types, combination modes, and sedimentary model of lacustrine shale restricted by high‐frequency sequence

The heterogeneity of lithofacies types, combination modes, and sedimentary model of lacustrine shale restricted by high‐frequency sequence

Sequence stratıgraphıc analysıs of the Galmaz field based on well loggıng data

Prediction of Reservoir Performance of Moby Field, Niger Delta Basin using Integrated Facies and Petrophysical Analyses

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