Articles
<![CDATA[Differenciating Oil, Gas And Water In Seismic Section Using Spectral Decomposition ]]>
<![CDATA[Suprajitno Munadi]]>;
<![CDATA[Humbang Purba]]>;
<![CDATA[Rosie A.S.]]>
<![CDATA[ Scientific Contributions Oil and Gas Vol. 35 No. 2 (2012): SCOG ]]>
Publisher : <![CDATA[Testing Center for Oil and Gas LEMIGAS ]]>
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DOI: 10.29017/scog.35.2.28
<![CDATA[Oil, Gas And Water Contained In The Pore Spaces Should Give Different Response In The Seismic Trace, But This Is Not An Easy Problem. However, From The Physical Point Of View Oil Is Quite Compressible, Gas Is Very Compressible And Water Is Incompressible, So In Principle They Should Give Different Response In Seismic Record. Since The Response In The Time Domain Is Sometimes Complicated In Nature, An Effort Has Been Carried Out To Remedy The Problem In The Frequency Domain. A Recent Advance In Signal Analysis Which Is Referred To As The Spectral Decomposition Has Been Used To Differentiate Oil, Gas And Water In Seismic Section. In This Case A Specifi C Method In Spectral Decomposition Called As The Continuous Wavelet Transform (CWT) Was Utilized For This Purpose. The Result Demonstrates That Oil, Gas And Water Can Be Differentiated Clearly In The CWT Spectrum Using The Data From The Deep Water Part In The Makassar Strait. The Results Are Encouraging.]]>
<![CDATA[Spectral Filtering For Removing Coal Bright Spot Effect In Seismic Interpretation ]]>
<![CDATA[Saputro, R. A]]>;
<![CDATA[Suprajitno Munadi]]>;
<![CDATA[Humbang Purba]]>
<![CDATA[ Scientific Contributions Oil and Gas Vol. 35 No. 3 (2012): SCOG ]]>
Publisher : <![CDATA[Testing Center for Oil and Gas LEMIGAS ]]>
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DOI: 10.29017/scog.35.3.31
<![CDATA[Gas Sand And Coal Bed Both Give Bright Appearence In Seismic Section. For The Purpose Of Gas Exploration One Has To Differentiate Between Gas Response And Coal Respone. A Spectral Fi Ltering Technique Is Introduced In This Paper To Solve This Problem. This Technique Is The Development Of The Spectral Decomposition Method Which Constitutes The Leading Edge In Seismic Data Analysis. Testing Using The Real Seismic Data Has Been Carried Out Using The Seimic Data From West Natuna Basin]]>
<![CDATA[A SIMPLE APPROACH FOR UNDERSTANDING SEISMIC WAVE PROPAGATION IN POROUS MEDIA ]]>
<![CDATA[Fakhriyadi Saptono]]>;
<![CDATA[Suprajitno Munadi]]>
<![CDATA[ Scientific Contributions Oil and Gas Vol. 22 No. 2 (1999): SCOG ]]>
Publisher : <![CDATA[Testing Center for Oil and Gas LEMIGAS ]]>
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DOI: 10.29017/scog.22.2.117
<![CDATA[A simple approach for understanding seismic wave propagation in, porous media has been developed based on the effect of stress gradient on compressibility of the matrix and the fluid. The fluid saturation is accommodated in the bulk density formulation. The approach started from Gassmann theoretical formulation followed by simplifying the mathematical detail by substituting their physical aspects. Finally a practical formula for core analysis purposes is introduced. The theoretical concepts and experimental results appear to be in a good agreement.]]>
<![CDATA[Application of Artificial Neural Network for Assisting Seismic-Based Reservoir Characterization ]]>
<![CDATA[Bambang Widarsono]]>;
<![CDATA[Fakhriyadi Saptono]]>;
<![CDATA[Patrick M Wong]]>;
<![CDATA[Suprajitno Munadi]]>
<![CDATA[ Scientific Contributions Oil and Gas Vol. 25 No. 1 (2002): SCOG ]]>
Publisher : <![CDATA[Testing Center for Oil and Gas LEMIGAS ]]>
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DOI: 10.29017/scog.25.1.138
<![CDATA[Reservoir rock physical properties, such as porosity and water saturation, always play prominent roles in the development of oil and gas fields. Accurate information regarding their distribution is always desired. For this new approach that uses a purpose, a combination of intelligent computing (artificial neural network or ANN) and rock physics, with a full utilization of core data, well logs and seismic-derived attributes, is proposed. The method is basically an effort to link the required rock physical properties to seismic- derived attributes through the use of rock physics theories. The ANN itself is used to fill the gaps of data array required by the proposed method through its capacity for pattern recognition. The proposed method is applied to a limestone reservoir in East Java. Validation is carried out by comparing the results to the observed data at well locations as well as by geological justification. The application has shown a new potential for supporting reservoir modeling and field development.]]>
<![CDATA[A Method For Generating Plane Wave And Zero-Offet Vsp Synthetic Seismograms ]]>
<![CDATA[Suprajitno Munadi]]>
<![CDATA[ Scientific Contributions Oil and Gas Vol. 8 No. 1 (1985): SCOG ]]>
Publisher : <![CDATA[Testing Center for Oil and Gas LEMIGAS ]]>
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DOI: 10.29017/scog.8.1.167
<![CDATA[Synthetic Vertical Seismic Profiles (VSP) seianograms are a useful aid to the interpretation of VSP re- conds, Plane wave VSP syntherics multiples and mode conversions can be computed rapldly n the frequency domain using a new recursive formulation. The method urilises the concept of "renultanz" phase related reflection and tranamission coefficients for a layer atack. High frequerncy signals can be handled with relative euse. The ability to control the order of the multiple avolds wraparound problems with the discrete Fourier transform. Several examples are used to lhustrate the method with relewance to seismic exploration.]]>
<![CDATA[SYNTHETIC SEISMIC RECORDS FROM HETEROGENEOUS MEDIA USING THE RAY TRACING METHOD ]]>
<![CDATA[Ahmad Yusuf]]>;
<![CDATA[Djoko Rubyanto]]>;
<![CDATA[Suprajitno Munadi]]>
<![CDATA[ Scientific Contributions Oil and Gas Vol. 18 No. 1 (1995): SCOG ]]>
Publisher : <![CDATA[Testing Center for Oil and Gas LEMIGAS ]]>
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DOI: 10.29017/scog.18.1.194
<![CDATA[Ray tracing method can be used to generate artificial seismic records from a heterogeneous medium which depend on the structure and stratification of the geologic model. The ray tracing method is a forward modelling process which is able to visualize the seismic wave propagation and its corresponding seismic record from different geologic models, so that the dominant parameters which control the model can be understood.]]>
<![CDATA[A COMPUTER PROGAM FOR COMPUTING SISMIC WAVE REFLECTION AND TRANSMISSION COEFFICIENTS OF A SINGLE INTERFACE ]]>
<![CDATA[Suprajitno Munadi]]>
<![CDATA[ Scientific Contributions Oil and Gas Vol. 8 No. 2 (1985): SCOG ]]>
Publisher : <![CDATA[Testing Center for Oil and Gas LEMIGAS ]]>
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DOI: 10.29017/scog.8.2.197
<![CDATA[Reflection and transmission properties of a single interface form the basic step in understanding and solving many problems of seismic waves propagation in multilayered media. The computational procedure of these coefficients is an essential element for numerical modeling or simulation purposes. A computer program for computing seismic wave reflection and transmission coefficients of a single interface has been effectively performed using the Gauss-Jordan elimination technique which is operated on a 4x 4 system of simultaneous linear equations with complex elements. The simultaneous equations have been ar ranged in matribx from. Elements of the matrix are obtained from the application of the boundary conditions to the solution of the seismic wave equations. The reflection and transmission coefficients for the compressional and shear waves constitute the unknowns of the simultaneous linear equations. Experiments using the program demonstrate the efficiency and the precislon of this procedure.]]>
<![CDATA[A New Type Of Digital Band - Pass Filter ]]>
<![CDATA[Suprajitno Munadi]]>
<![CDATA[ Scientific Contributions Oil and Gas Vol. 9 No. 1 (1986): SCOG ]]>
Publisher : <![CDATA[Testing Center for Oil and Gas LEMIGAS ]]>
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DOI: 10.29017/scog.9.1.203
<![CDATA[Digital filtering is mathematical process which provides a means of filtering data numerically. The filtering process can be carried out in the frequency domain to discriminate signal and noise based on the frequency differencesThe digital band-pass frequency filtering has been effectively accomplished using a new type of digital filter. This filter is the result of compolving a boxcar spectral window with a frequency shifted Gaussian function which produces a very smooth transition between the pass-band and the stop-band region. The slope of the filter is controlled by the exponential coefficient of the Gaussian function. For a very narrow pass-band the exponential coefficient also controls the resolution of the filter.Experiments have been done with the Synthetic Vertical Seismic Profiles data to prove the performance of the filter and shows a good results.]]>
<![CDATA[ATTENUATION ANALYSIS OF VSP DATA ]]>
<![CDATA[Suprajitno Munadi]]>
<![CDATA[ Scientific Contributions Oil and Gas Vol. 10 No. 2 (1987): SCOG ]]>
Publisher : <![CDATA[Testing Center for Oil and Gas LEMIGAS ]]>
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DOI: 10.29017/scog.10.2.230
<![CDATA[Attenuation is usually defined to include all types of frequency selective process wich contribute to the am- plitude decay of propagating waves. It depends on porosity of rock, grain size, over pressure zones and fluid saturation. Attenuation can at least double the information obtained from velocities alone. The measurement of attenuation from a Vertical Seismic Profiles (VSP) has been carried out using two dif- ferent methods ie. the Spectral Magnitude Decay Method and the Pulse Broadening Method. The Spectral Magni- tude Decay Method is executed in the frequency domaiün, while the Pulse Broadening Method is entirely executed in the time domain. Both methods have been tested using two shallow, high resolution VSP data. The deduced quality factor Q. obtained from the Spectral Magnitude Decay Method is slightly lower than those obtained from the Pulse Broadening Method. Thèse discTepancies can be attributed to reflection/transmission loses at layer boundaries which are lumped together with absorption in the frequency domain estimates.]]>
<![CDATA[Seismo-Electric Phenomena From Granite Crack Containing Crude Oil ]]>
<![CDATA[Suprajitno Munadi]]>
<![CDATA[ Scientific Contributions Oil and Gas Vol. 30 No. 1 (2007): SCOG ]]>
Publisher : <![CDATA[Testing Center for Oil and Gas LEMIGAS ]]>
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<![CDATA[Seismo-electric phenomena gained more attention from geophysicists over the last de-cade. The development of theoretical background and the success of laboratory experi-ments as well as limited field applications give a lot of opportunities and hope as a meansfor providing exploration and production data. Seismo-electric effect accommodates anyphenomena which links seismic and electrical energy including seismic to electric conver-sion as well as electro kinetic in origin. Experiment has been conducted to prove that free ions can be considered to accumu-late inside a granite crack containing crude oil which in turn can generate strearn oscilla-tory electric current when a seismic wave hit the fracture. As a result, electric potential canbe detected at the rnouth of the fracture which intersects the borehole. The environmentalnature of the rnouth which is full of fluid facilitates the detection of high resolution seismo-electric signal by simple electrodes which is rnade of metal.]]>
