Relative amplitude preservation in high-resolution shallow reflection seismic: a case study from Fore-Sudetic Monocline, Poland

Cichostępski, Kamil; Dec, Jerzy; Kwietniak, Anna

doi:10.1007/s11600-018-00242-6

Cited by 9 publications

(11 citation statements)

References 28 publications

(27 reference statements)

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“…Shallow seismic reflection imaging requires the special design of acquisition parameters and processing sequence, when it is aimed at petrophysical reasoning due to inversion [31,32]. The main aim of our study was to image a carbonate sulfur deposit that occurs at depths of 260 m and is 28 m thick.…”

Section: Discussionmentioning

confidence: 99%

“…As a result, coherent noise did not interfere with the amplitudes of the target reflections. Hence, the removal of linear noise did not disturb the amplitudes reflected from the geological target [32]. In the acquisition we utilized 100 Hz geophones.…”

Section: Discussionmentioning

confidence: 99%

“…The acquired data were processed with relative amplitude preservation (RAP), which is necessary when using seismic data for seismic reservoir characterization [28][29][30][31][32]. The main goal of the processing was to obtain high quality pre-stack data that would be further used as an input for elastic moduli extraction through inversion workflow.…”

Section: Seismic Data Processingmentioning

confidence: 99%

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Simultaneous Inversion of Shallow Seismic Data for Imaging of Sulfurized Carbonates

Cichostępski¹,

Dec²,

Kwietniak³

2019

Minerals

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In this article, we present a high-resolution shallow seismic surveying method for imaging the inner structure of the Miocene evaporitic formation, where sulfur ore occurs. The survey was completed in the northern part of the Carpathian Foredeep (SE Poland) where sulfur deposits occur up to a depth of ca. 260 m. In this region, the sulfur ore is strata-bound and exists within a carbonate interval of a thickness of approximately 28 m. The average sulfur content reaches up to 30%. Five seismic profiles were acquired with a total length of 2450 m. The acquisition was designed to obtain high-resolution, long offsets and a satisfactory signal-to-noise ratio. In the field, we used 48 channels and variable end-on roll-along spread that allowed us to record offsets of up to 375 m. Data processing was aimed at preserving relative amplitudes (known as RAP, relative amplitude preservation processing), an approach that is necessary for seismic inversion application. With the utilization of well log data and results of simultaneous inversion, we were able to calculate the elastic properties of the deposit to evaluate sulfur ore content and changes in lithology. The sulfur content is strongly dependent on the carbonate reservoir’s porosity. To evaluate porosity changes and associated sulfur content, a simultaneous inversion procedure was used. This is a pioneering approach in which we applied pre-stack inversion methods to shallow carbonate sediments.

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Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Section: Seismic Data Processingmentioning

confidence: 99%

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Simultaneous Inversion of Shallow Seismic Data for Imaging of Sulfurized Carbonates

Cichostępski¹,

Dec²,

Kwietniak³

2019

Minerals

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“…For spectral decomposition a seismic volume with relative amplitude preservation (RAP volume) should be preferably used. Such processing would not modulate both amplitude relation and frequency relation [17,18]. More invasive processing sequences may introduce some frequency range [10] that will affect the response for a transition zone.…”

Section: Methodsmentioning

confidence: 99%

Seismic Signature of Transition Zone (Wolf Ramp) in Shale Deposits with Application of Frequency Analysis

2021

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The concept of a transition zone, known as Wolf ramp, was incorporated into the seismic interpretation of a 3D seismic survey situated within the Baltic Basin (Northern Poland). Within the survey area, there exists one formation, the Pasłęk Formation, (Lower Silurian—Llandovery), that exhibits a linear change of velocity. This characteristic—linear change of velocity—causes a reflection coefficient (i.e., seismic amplitude) produced at such a boundary to be frequency dependent. The Pasłęk Formation was considered to be a potential shale gas reservoir and it was necessary to determine its structural position and thickness. The formation is challenging for robust seismic interpretation on the migrated seismic section—it does not manifest a stable reflection coefficient, and the amplitude contrast associated with the borders of the formation is low. There is no impedance contrast that would produce a reflection of high amplitude at the top or base of the formation which excludes determination of the formation thickness, hence the estimation of reservoir volume. Within a 3D dataset, there exists only one well with complete logs that were used for the analysis. The Pasłęk Formation is a flat-lying layer that continues itself far beyond the 3D survey. It is present in wells in the vicinity of the study area. These wells lay within other 3D or 2D datasets, but the quality of the seismic is poor, and similar seismic analysis is not possible. Nevertheless, these wells were incorporated in the research to reason about the possible link between the existence of transition zone and mineral content. The method used for recognition of transition zone is spectral decomposition and spectral analyses. The integrated studies enabled us to find a link between the Wolf ramp and mudstone-claystone interval of the Silurian age and give a new example of a transition zone which is present in shale plays. The transition zone concept might be applied for shale plays identification and analysis.

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“…From many years of surveying within the area of sulphur deposits we have developed a special methodology for seismic acquisition and adopted the method of data processing, which is widely used in hydrocarbon seismic exploration, but rarely utilized in shallow seismic surveying. This allows us to obtain the relative amplitude preserved data necessary for reservoir characterisation [13,[20][21][22]. To evaluate the deposit, we used and compared two methods of estimating the sulphur content.…”

Section: Introductionmentioning

confidence: 99%

Estimation of Shallow Sulphur Deposit Resources Based on Reflection Seismic Studies and Well Logging

Cichostępski

Dec

2021

Energies

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In this article we present a novel method for the estimation of sulphur deposit resources based on high-resolution shallow reflection seismic survey and well logging. The study area was sited in the northern part of the Carpathian Foredeep (SE Poland), where sulphur ore occurs in carbonate rocks at a depth of about 120 m, with a thickness of approximately 25 m. The results of many years of seismic monitoring performed in the area of the sulphur deposit allowed us to determine the quantitative relationships between the amplitude of the seismic signal reflected from the top of the deposit and its petrophysical parameters such as porosity and sulphur content. The method of evaluating sulphur deposit is based on extensive statistics concerning the reservoir properties obtained from borehole data. We also discuss a methodology for conducting field acquisition and processing of seismic data in the aspect of mapping the actual amplitudes of the signal reflected from the top of a deposit. The results of estimating the abundance of carbonate sulphur deposits are presented based on the example of a seismic cross-section from the Osiek sulphur mine. Obtained results allow indicating the most prospective zones suitable for exploitation.

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Relative amplitude preservation in high-resolution shallow reflection seismic: a case study from Fore-Sudetic Monocline, Poland

Cited by 9 publications

References 28 publications

Simultaneous Inversion of Shallow Seismic Data for Imaging of Sulfurized Carbonates

Simultaneous Inversion of Shallow Seismic Data for Imaging of Sulfurized Carbonates

Seismic Signature of Transition Zone (Wolf Ramp) in Shale Deposits with Application of Frequency Analysis

Estimation of Shallow Sulphur Deposit Resources Based on Reflection Seismic Studies and Well Logging

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