1. The document discusses applying multi-curve reconstruction technology to seismic inversion to improve accuracy and reliability. It focuses on reconstructing SP and RMN curves from well logs that are affected by various distortions.
2. The process of reconstructing the curves involves removing baseline drift, standardizing values, applying linear filtering, and fitting the curves. This removes interference and retains valid lithological information.
3. Reconstructing high quality curves improves the resolution and credibility of seismic inversion results. The method is shown to effectively predict sand distribution with little error.
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Field and Theoretical Analysis of Accelerated Consolidation Using Vertical Dr...inventionjournals
Mumbai is the region consisting of soft compressible marine clay deposits. There are several construction problems on such soils and thus ground improvement is need to be carried out. Vertical drains is generally preferred technique as accelerated settlement is achieved during the construction phase itself if planned accordingly. The concept of vertical drains is based on the theory of three dimensional consolidation as described by Terzaghi (1943). Based on this concept, a consolidation programme is developed and an attempt is made to determine the field to laboratory coefficient of vertical consolidation ratio by Taylor’s Square Root of Time Method and Casagrande’s Logarithm of Time Fitting Method for this region. Based on this, the rate of consolidation and time required for consolidation in the field can be determined knowing the consolidation parameters. Equations are developed by using output of the programme and it is explained.
Effect of Petrophysical Parameters on Water Saturation in Carbonate FormationIJERA Editor
Assessment of petrophysical parameters is very essential for reservoir engineers. Three techniques can be used to
predict reservoir properties: well logging, well testing, and core analysis. Cementation factors and saturation
exponents are crucial for calculation, and their values pose a pronounced effect on water saturation estimation. In
this study, a sensitivity analysis was performed to investigate the influence of cementation factor and saturation
exponent variation, as it applies to logs and core analysis, for use in water saturation estimates. Measurements of
water saturation resulting from these variations showed a maximum spread difference of around fifteen percent.
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Reservoir characterization technique based on geostatistical inversion methodiosrjce
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Advances in Rock Physics Modelling and Improved Estimation of CO2 Saturation, Giorgos Papageorgiou - Geophysical Modelling for CO2 Storage, Leeds, 3 November 2015
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Passive seismic monitoring for CO2 storage sites - Anna Stork, University of Bristol at UKCCSRC specialist meeting Geophysical modelling for CO2 storage, monitoring and appraisal, 3 November 2015
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Reservoir characterization technique based on geostatistical inversion methodiosrjce
IOSR Journal of Applied Geology and Geophysics (IOSR-JAGG) is a double blind peer reviewed International Journal that provides rapid publication (within a month) of articles in all areas of Applied Geology and Geophysics. The journal welcomes publications of high quality papers on theoretical developments and practical applications in Applied Geology and Geophysics. Original research papers, state-of-the-art reviews, and high quality technical notes are invited for publications.
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Effects of shale volume distribution on the elastic properties of reserviors ...DR. RICHMOND IDEOZU
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Advanced logging evaluation gas reservoir of Levantine basinFabio Brambilla
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J05915457
1. IOSR Journal of Engineering (IOSRJEN) www.iosrjen.org
ISSN (e): 2250-3021, ISSN (p): 2278-8719
Vol. 05, Issue 09 (September. 2015), ||V1|| PP 54-57
International organization of Scientific Research 54 | P a g e
Application of the multi-curve reconstruction technology in
seismic inversion
Mingxue Zhang1
, Fengquan Zhao1
, Dianju Wang1
, Peng Cheng1
1. Northeast Petroleum University, Daqing, Heilongjiang, China, 163318
Abstract: - Well logs are usually used to constrained inversion during reservoir predicting. However the seismic
inversion cannot be accurately guiding because of the logs affected by the various factors, which will affect the
accuracy and reliability of prediction. Combined with the actual situation of Saertu areas, SP and RMN curve is
fitted through multi-curve reconstruction technology. Remove the interference information, and remain the valid
information of SP curve against the way that errors generate. Suppress the effects of high lithological
differences and random interference to their baseline by standardization, normalization, linear filtering method
and then fit SP and RMN curves. Proposed high-resolution, high-fidelity curve reconstruction, seismic inversion
guidance sand prediction, and achieved good results [1]. This indicates that the method is a simple, practical and
effective curve reconstruction techniques can be promoted in practical applications.
Keywords: - Well logging, Standardization, Multi-curve reconstruction technology,Seismic inversion
I. INTRODUCTION
Logging constrained inversion of seismic reservoir is a well logging, seismic, geological formations
and other data of the wave impedance (or speed) inversion technique. With the inversion continuous
development of technology, there are now a variety of wave impedance inversion method, the correct
application of these methods is the key to describe the reservoir, while effectively utilizing the raw data is
crucial inversion [2]. Therefore, analysis and application logging data is particularly important seismic inversion.
With the development of in-depth exploration, the requirements of reservoir prediction accuracy are high, so the
requirements for sonic log data used in the seismic inversion is also rising. Only the results of the inversion can
effectively reflect the speed or wave impedance difference between the reservoir and the surrounding rocks,
reservoir can be described correctly [3]. However, the differences between the reservoir and the surrounding
rock are small because the reservoir subsurface has a strong reservoir space complexity, controlling factors and
more features. In addition, in many cases, the well logs ,which are used for seismic and geologic horizon
calibration and wave impedance inversion, are enable to reflect the changes of lithology [4] due to the impact of
pollution wellbore formation and the degree of compaction logging conditions and other factors. It is
particularly obvious when subsurface horizons are thin and inter bedded.
In this article, SP curve and RMN curve is selected. Firstly, the correspondence between the two curves and
lithology are analyzed to find out the reasons for the distortion effects then their active ingredients are retained.
Finally, the curve is fitted by a suitable method. The process includes baseline drift, standardization, linear
filtering, curve fitting.
II. SP CURVE PROCESSING
This article is based on research by professor Wang Pujun who research volcanic rock in Xujiaweizi
proposed based on "Lithology - Fabric - Causes," the division method. It is mainly based on lithology, the
volcanic eruption phase is divided into 5 categories, including eruption phase, effusive phase, intrusive facies,
volcanic channel phase and volcanic sedimentary facies. According to the characters of volcanic rock formation
in Ying Shan depression, In the same process of volcanism, spatial distribution of volcanism product output
characteristics included crater - near crater facies, proximal facies group, far source facies, volcanic sedimentary
facies group (group handling and mixed phase), each phase group on the spatial location, lithologic combination,
seismic characteristics have bigger difference, reservoir capacity difference is also big. The process includes
baseline drift, standardization, linear filtering, curve fitting. The value of SP curve can vary greatly due to the
geological conditions and water conditions, which brings great difficulties to the next work.So it is very
important to be made in the suitable range.
2. Application of the multi-curve reconstruction technology in seismic inversion
International organization of Scientific Research 55 | P a g e
Three-dimensional coherent cube technology is the use of 3 d seismic cube in the similarity of seismic signals
between adjacent channels to describe the lateral heterogeneity of strata, lithology. The crater with the ring, the
radial structure, shows weak coherent, messy reflection insider on the coherence of coherent.
Fig 1 SP curve before drift Fig 2 SP curve after drift
In this article, SP curve and RMN curve is selected. Firstly, the correspondence between the two curves and
lithology are analyzed to find out the reasons for the distortion effects then their active ingredients are retained.
Finally, the curve is fitted by a suitable method. The process includes baseline drift, standardization, linear
filtering, curve fitting. The effect of baseline shift can be seen in Fig 1 and Fig 2.
Fig 3 SP before normalization Fig 4 SP after normalization
The value of SP curve can vary greatly due to the geological conditions and water conditions, which brings great
difficulties to the next work. So it seems very essential to correct the value of SP curve which is shown in Fig 3
and Fig 4.
III. RMN CURVE PROCESSING
The rive sands of Saertu during thin horizons develop well. Thin horizons that contain calcium are
often found, which seem knife in the curve and will bring difficult to next work. It may mislead the result of
seismic inversion. For this problem, how to deal with this abnormal values become very import and its effect
3. Application of the multi-curve reconstruction technology in seismic inversion
International organization of Scientific Research 56 | P a g e
will reflect on the result of inversion directly. Naturally, an appropriate mean should be taken--linear filtering is
proposed, which sets a range of normal value and then fills proper values in abnormal range. In this way the
negative effect of calcium horizons is effectively repressed.
The structure of this area varies quickly and has huge difference, which result in a large difference curve value
of the RMN curve. For this problem, the approach of trend surface standardization is chosen because this
method can solve this problem effectively [6].
A basic model is established to study by trend surface fitting formula several times duality equation like this:
2 2
51 2 3 4 6
' ...Z B B X B Y B X B X Y B Y e
In this equations, e is the random deviation; 1, 2, ...,i
B i p is undetermined coefficients of the polynomial
'Z ; ,X Y is the location coordinates.
Due to the measured point number is limited, fitting measuring point is limited, and it can be changed the fitting
polynomial to:
2 2
1 2 3 4 5 6
...Z B B Y B Y B X B X Y B Y
Fig 5 RMN curve before processing Fig 6 RMN curve after processing
Square and random deviations for optimal estimation to determine the coefficients of the polynomial, as follows:
2 2
1 2 3 4 5 6
' ' ...f e Z Z Z B B Y B Y B X B X Y B Y m in
f
Making it zero-order partial derivatives:
0 1, 2, ...,
i
f
i n
B
Solving the equations, the coefficients 1 2
, ,...B B can be obtained.
In this process, the geological information is effectively joined to make the standardization more meaningful
through improving parameters. It is shown in Fig 5 and Fig 6.
IV. SEISMIC INVERSION
The resolution of impedance inversion is low and its details is not clear. The thickness of sand is bigger then its
real thickness. High quality curve ensure the accuracy and reliability of the well logs constraint seismic
inversion. The reconstructed curve is obtained on the basis of several tests in this area. The reconstructed curve
promises these:
It has high resolution because the RMN curve has high resolution and high stability.
It is shown in Fig 7 and Fig 8.
Fig 7 Impedance inversion Fig 8 reconstructed curve inversion
4. Application of the multi-curve reconstruction technology in seismic inversion
International organization of Scientific Research 57 | P a g e
The high resolution and accuracy of multi-curve inversion is shown in Fig 9, the map of sand thickness, which
are extracted from the results of inversion data. Error statistics: >2m 93%.
Fig 9 the map of sand thickness of inversion
V. CONCLUSION
For the conventional problem—low resolution and low credibility, high quality multi- curve
reconstruction is proposed through analyzing the sources of noise, improving coefficient, suppressing the noise
by linear means. The result of the prediction of distribution of sands proves that the high quality multi- curve
reconstruction seismic inversion can solve low resolution and low credibility with little error.
REFERENCES
[1] F.Y.Ren,X.J.Zhu,et al:Progress in Geophysics,(2012)no.27,p.1640-1647.
[2] Z.D.Li,W.Zhao,Y.Li,et al:Oil & Gas Geology,(2011)no.32,p.797-806.
[3] Z.Cai,L.Quan:Geological review,(1993)no.39,p.371-377.
[4] Wang Pujun, Chi Yuan lin, Liu Wanzhu, Volcanic facies of the Songliao Basin: Classification,
Charcteristics and reservoir significance, Journal of Jilin University Earth Science Edition, 33(4), 2003,
449-456.
[5] Chen Changle, Liu Yang, Liu Cai, Volcanic rock recognition by local seismic attribution, Global
Geology, 30(4), 2011, 660-665.
[6] Zhou Tianqi, Ji Ling, Volcanic rock distribution prediction in Zao 35 block based on seismic attribute
analysis technology, Journal of Yangtze University 11(10), 70-73.