Application of crossplot and prestack seismic-based impedance inversion for discrimination of lithofacies and fluid prediction in an old producing field, Eastern Niger Delta Basin

Okeugo, Chukwudike Gabriel; Onuoha, K. Mosto; Ekwe, C. A.; Anyiam, Okwudiri A.; Dim, Chidozie Izuchukwu Princeton

doi:10.1007/s13202-018-0508-6

Cited by 15 publications

(10 citation statements)

References 24 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Pre stack seismic simultaneous inversion is a stratigraphic deconvolution technique used for reservoir characterization due to its high resolution and ability to track thin beds (Okeugo et al 2018). One fundamental advantage of using this method of seismic inversion technique for constructing an earth model of various geomechanical properties is its ability to extract additional information such as shear velocity (V S ) and density (ρ) from seismic data.…”

Section: The Conceptual Frameworkmentioning

confidence: 99%

“…Advancement in seismic technology has led to the ease in estimation of geomechanical properties. Advances on the use of Prestack time-migrated (PreSTM) data have enormously helped in evaluating geomechanical properties with minimum error, thereby reducing the problem posed by inadequate knowledge of these properties (Okeugo et al 2018). The issue of band-limit vertical resolution and uniqueness of the deterministic inversion results has led to the use of Prestack seismic inversion for the evaluation of geomechanical properties (Trudeng et al 2014).…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Application of pre-stack seismic waveform inversion and empirical relationships for the estimation of geomechanical properties in Ruby field, central swamp depobelt, Onshore Niger Delta, Nigeria

Ugbor

Odong

Akpan

2021

J Petrol Explor Prod Technol

View full text Add to dashboard Cite

Pre-stack seismic inversion, well log analysis approach and empirical relations were adopted in this study to better estimate geomechanical properties of Ruby field with minimum error. The use of conventional well log empirical method alone to evaluate geomechanical properties in oil/gas fields sometimes becomes problematic. Geomechanical properties were divided into: elastic moduli [Young’s modulus, shear modulus, bulk modulus and Poisson ratio (PR)] and rock mechanical strength properties (closure stress ratio (CSR), brittleness (BRI) and compressibility). Four geomechanical earth models (CSR, BRI, Young’s modulus and PR) were generated from the inversion analysis to understand the distribution of rock strength properties across the field. The results deciphered high Young’s, shear and bulk modulus in the reservoir zone compared to the cap/seal rocks and a decrease in PR. This implies that, the cap/seal are more ductile and less compressible than the reservoir rocks, indicating that the reservoirs are highly brittle. CSR result reveals high in cap/seal indicating that the cap/seal rock are harder to fracture and has a greater chance to withstand higher compressive stress before failing as opposed to reservoir rocks. The inverted earth model shows that, Young’s modulus and brittleness increase toward the northeastern part of the field, while CSR and PR increase toward the southwestern part of the field. These results suggest that harder, stiffer, highly compressible and easily fractured rocks are found in the northern and eastern part of the field as opposed to the southern to western part of the field that is ductile.

show abstract

Section: The Conceptual Frameworkmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Application of pre-stack seismic waveform inversion and empirical relationships for the estimation of geomechanical properties in Ruby field, central swamp depobelt, Onshore Niger Delta, Nigeria

Ugbor

Odong

Akpan

2021

J Petrol Explor Prod Technol

View full text Add to dashboard Cite

show abstract

“…The Agbada Formation underlies the Benin Formation and ranges from Eocene to recent. It consists of alternating sands, silts and shales which are defined by progressive upward changes in grain size and bed thickness (12) . The Akata Formation ranges from Paleocene to recent and comprises of marine shales with sandy and silty beds thought to have been deposited as turbidites.…”

Section: Location and Geology Of The Study Areamentioning

confidence: 99%

Assessment of updated low frequency model in delineating bypassed hydrocarbon reservoir: A 4D seismic study of ’X’ - field, offshore, Niger Delta, Nigeria

Akpan¹

2020

IJST

View full text Add to dashboard Cite

Aim/objectives: The aim of this research is, to use Time lapse (4D) seismic and investigate the influence of low frequency update in deterministic model-based seismic inversion employed in delineating a prospect saturated with bypassed hydrocarbon accumulation. Method: The dataset employed in this study incorporates 4D seismic volumes with fifteen (15) years production, interval between 2001 baseline and 2016 monitor seismic vintages. The inversion was carried out using full bandwidth of the updated low frequency and bandpass filtered low frequency approaches. The seismic vintages (baseline and monitor) were simultaneously inverted into acoustic impedance volumes for the two approaches. The formation fluid and lithology were discriminated through fluid replacement modelling (FRM) based on the colour separation between brine and gas saturation scenarios. Findings: The two inversion methods employed reveal six (6) zones suspected to be saturated with bypassed hydrocarbons. The delineated bypassed zones are masked in the full bandwidth approach,depicting the effect of the updated low frequency model. Meanwhile, the bandpass filtered approach result presents a better delineated bypassed reservoir as the zones are more pronounced when compared with the full bandwidth approach. Porosity estimate reveals that the bandpass filtered approach is characterized with excellent porosity in the suspected bypassed zones. The results equally gave more reliable and full delineated bypassed zones. Originality and novelty: The dataset employed in this study were obtained from a producing hydrocarbon field which, interest is to maximize the production of oil/gas. The study will bridge the inherent gab observed in using model-based seismic inversion approach to analyse and interpret seismic data in order to delineate hydrocarbon prospects. The research reveals that,the model-based seismic inversion method is still very effective in delineating hydrocarbon prospect when the updated low frequency is bandpass filtered to remove the model effect which influences the inverted acoustic impedance results. Keywords: Porosity; frequency; bypassed; reservoir and impedance

show abstract

“…In June 2019, P. Connolly [13], by using the normalized elastic property reflectance pair as the base vector, determined that the position of the reflectance point in the intercept gradient space can be directly determined from the elastic property comparison, which can more intuitively understand the structure of the intercept gradient crossplot. C. G. Okeugo, K. M. Onuoha [14] et al used cross-plots to distinguish lithofacies and predict fluids for accurate positioning of new wells. In July, Un Young Lim, Richard L. Gibson, and others [15] proposed a new method of crossplots based on the Zoeppritz equation, and applied this method to the estimation of total organic carbon (TOC) content in shale.…”

Section: Introductionmentioning

confidence: 99%

A Visualization and Analysis Method by Multi-Dimensional Crossplots from Multi-Well Heterogeneous Data

et al. 2022

View full text Add to dashboard Cite

Crossplot is an important tool for data visualization analysis in well logging processing and interpretation. Generally, the color of the points in the crossplot is calibrated by the data to improve the plane crossplot from two dimensions (2D) to three dimensions (3D). However, this method is limited to the logging data. In many cases, it is necessary to use crossplots for comprehensive evaluation with the well logging, geology, mud logging, and oil testing data, or to deeply analyze the data from multiple wells and multiple layers. The traditional crossplots cannot meet the demands. To expand the traditional crossplot to multiple dimensions, we proposed an augmented-dimensional visualization and analysis method by the crossplot with multi-well and multi-dimensional heterogeneous data, which is developed based on the traditional crossplots. Firstly, we built the match matrix of the augmented-dimensional heterogeneous data from different depths and set up the crossplots of the heterogeneous data after depth normalization. In this way, the attribute calibrations of the points in the crossplots by logging data were realized, and the auxiliary figures of the augmented-dimensional crossplots were established. In addition, the crossplots were expanded to more dimensions by collaborative analysis of the multiple crossplots and synchronous display in different single-well and multi-well modules with the feature points projection. Secondly, we established the display method of the crossplots from multi-well data by quadtree index. The display and interaction performance of the augmented-dimensional crossplots under the conditions of large amount of data from multiple wells were greatly improved by optimizing the overlapped and covered points in the crossplots. This method can provide more information about the reservoirs and realize the comprehensive well logging comparison, analysis, and visualization from different views. It has been developed and integrated into a CIFLog software platform and has been widely used in many domestic oilfields.

show abstract

Application of crossplot and prestack seismic-based impedance inversion for discrimination of lithofacies and fluid prediction in an old producing field, Eastern Niger Delta Basin

Cited by 15 publications

References 24 publications

Application of pre-stack seismic waveform inversion and empirical relationships for the estimation of geomechanical properties in Ruby field, central swamp depobelt, Onshore Niger Delta, Nigeria

Application of pre-stack seismic waveform inversion and empirical relationships for the estimation of geomechanical properties in Ruby field, central swamp depobelt, Onshore Niger Delta, Nigeria

Assessment of updated low frequency model in delineating bypassed hydrocarbon reservoir: A 4D seismic study of ’X’ - field, offshore, Niger Delta, Nigeria

A Visualization and Analysis Method by Multi-Dimensional Crossplots from Multi-Well Heterogeneous Data

Contact Info

Product

Resources

About