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Suprajitno Munadi
Research and Development Centre for Oil and Gas Technology "LEMIGAS"
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INDONESIAN TERTIARY SEDIMENTARY BASIN Djoko Sunarjanto; Sri Wijaya; Suprajitno Munadi; Bambang Wiyanto; Doma F. Prasetio
Scientific Contributions Oil and Gas Vol 31 No 2 (2008)
Publisher : Testing Center for Oil and Gas LEMIGAS

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29017/SCOG.31.2.1002

Abstract

Since 1980 the number of Indonesian Sedimentary Basin which is officially announced by the government are 60 basins, but informally the variation in the range of less than 60 up to around 66 basins. Based on stratigraphic and tectonics conditions of some areas there are overlapping layers between Tertiary Sedimentary and Pre Tertiary Basin. In general the definition of a sedimentary basin is a region, part of the earth's crust where sedimentary strata have been deposited in a relatively much greater thickness than its surrounding area. The nomenclature for basin is referred more to basinal areas. Based on sedimentary basin classification there are: type of plate where basin exists, basin position in the plate margin, type of plate interaction, time development of basin and basins fill with respect to tectonic and shape of the basin. The updating classification using new technology and knowledge of the basin, can also update previous knowledge because of the limitation of the data and the lack of new concept when the report was published. 63 Tertiary Sedimentary Basins (16 producing basin of oil and gas, 8 drilled basin with discovery, 15 drilled basin with has no discovery yet and 24 basin which has not been drilled yet) could be used as a basic data for development of science and technology, to support government policy and investor, to improve and accelerate oil and gas exploration and production in Indonesia.
UNDERSTANDING NATURALLY FRACTURED RESERVOIRS Suprajitno Munadi; Samsul Hidayat; Julikah Julikah; Oki Hendriana; Eko Susanto
Scientific Contributions Oil and Gas Vol 31 No 2 (2008)
Publisher : Testing Center for Oil and Gas LEMIGAS

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29017/SCOG.31.2.1003

Abstract

Naturally fractured reservoir differs from clastic reservoirs in the sense that the concepts of porous media which were usually applied for clastic reservoir analysis must be modified. This means that handling naturally fractured reservoir is also different compared to handling clastic reservoir. The porosity may be changed a bit bigger but the permeability is drastically changed. Also at a depth where rock layers are usually tight, naturally fractured reservoirs converts it to become a good reservoirs. Naturally fractured reservoirs can be found in some part of the Indonesian basin which may contribute a considerable additional reserves in the near future.
POSSIBILITY TO ESTIMATE BULK PERMEABILITY FROM SEISMIC DATA Suprajitno Munadi
Scientific Contributions Oil and Gas Vol 29 No 1 (2006)
Publisher : Testing Center for Oil and Gas LEMIGAS

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29017/SCOG.29.1.1022

Abstract

Permeability is one of the most important reservoir parameter which determines the reserves. Unlike the porosity which is considered to be the static property of oil and gas reservoir, permeability is the dynamic property. It reflects the ability of reservoir rock to transmit fluid (oil gas or water). The reservoir rock is located deep below the subsurface, so that the measurement of the permeability is usually carried out from the cores. So far there is no well logging tool which measures the rock permeability directly. Physically, there is no direct relationship between porosity and permeability, the estimation of permeability from the cross-plot between porosity and permeability is just a rough estimate, but it is usually accepted in practical application. Apart from cross- correlation method, there is now exist a sophisticated approach to estimate permeability based on well log data using artificial neural network. There now exist a method which is widely accepted to estimate the porosity of the subsurface layer using seismic method. This method exploits the relationship between porosity and acoustic impedance of the sub- surface layer. And since acoustic impedance can be derived from the seismic amplitudes, it means that the rock porosity can be estimated from seismic data. A new question can be exposed as follows : "Is there any seismic wave parameter or quantity which is theoretically can be releted to permability ?" (so that the estimation of reservoir permeability can be estimated from seimic data). This paper tries to propose an idea to use a specific seismic wave parameter whis is theoretically can be related to the permeability of a reservoir rock, with a hope that more detail research can be pointed to that direction. This idea is supported by qualitative analysis and some theoretical findings
A SIMPLE APPROACH FOR UNDERSTANDING SEISMIC WAVE PROPAGATION IN POROUS MEDIA Fakhriyadi Saptono; Suprajitno Munadi
Scientific Contributions Oil and Gas Vol 22 No 2 (1999)
Publisher : Testing Center for Oil and Gas LEMIGAS

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29017/SCOG.22.2.1088

Abstract

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.
SYNTHETIC SEISMIC RECORDS FROM HETEROGENEOUS MEDIA USING THE RAY TRACING METHOD Ahmad Yusuf; Djoko Rubyanto; Suprajitno Munadi
Scientific Contributions Oil and Gas Vol 18 No 1 (1995)
Publisher : Testing Center for Oil and Gas LEMIGAS

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29017/SCOG.18.1.1102

Abstract

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.
ANALOG SEISMIC RECORDING REVISITED Suprajitno Munadi
Scientific Contributions Oil and Gas Vol 16 No 1 (1993)
Publisher : Testing Center for Oil and Gas LEMIGAS

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29017/SCOG.16.1.1108

Abstract

Analog single channel seismic recording is a conventional technique commonly used in subsurface profiling. One of its advantage is the resolution much higher than that of digital seismic recording. This advantage can be very useful in interpreting detail stratigraphic and structural subsurface features of the digital seismic section. In this case both profile are complementary.
THE HYPERBOLIC RADON TRANSFORM AND SOME OF ITS APPLICATION IN SEISMIC DATA PROCESSING Suprajitno Munadi
Scientific Contributions Oil and Gas Vol 15 No 1 (1992)
Publisher : Testing Center for Oil and Gas LEMIGAS

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29017/SCOG.15.1.1113

Abstract

The Radon transform has been used in exploration seismology for a decade. It consists of stacking seismic traces along a line of constant ray parameter p. this transform is used to map seismic data from time distance space into tau-p space, where tau is the intercept time.
SEPARATION OF UP GOING AND DOWN GOING WAVES IN VSP USING SINGULAR VALUE DECOMPOSITION Suprajitno Munadi; Lasmi Kustiowati; Moh. Bunjamin
Scientific Contributions Oil and Gas Vol 14 No 1 (1991)
Publisher : Testing Center for Oil and Gas LEMIGAS

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29017/SCOG.14.1.1118

Abstract

The separation of upgoing and downgoing waves in Vertical Seismic Profiling (VSP) is effectively accomplished using the singular value decomposition method. The VSP data can be decomposed into eigenimages which is directly proportional to the singular value.
VELOCITY ANALYSIS USING N-TH ROOT STACK Suprajitno Munadi; Pambudi Pambudi
Scientific Contributions Oil and Gas Vol 12 No 1 (1989)
Publisher : Testing Center for Oil and Gas LEMIGAS

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29017/SCOG.12.1.1138

Abstract

The estimation of seicmic wave velocity in the subsurface is one of the most important process in seismic data processing. The result is very crucial for the conversion af seismic data fromtime section into depth section.            The N-th Root Stack which has not been widely used in the industry in fact a powerful method for estimating seismic wave velocity from seicmic record. The method attenuates the background/random noise effectiviely which facilitates tre fitting of the velocity spectrum can be done anccurately. In addition, the noise is also effectivdy suppressed during the CDP stackins, yielding the clear inrim i doking amplitude            Synthetic records have been used to demonstrate the effectiveness of the N-th Root Stack Comparison with the Delay and Sum method also demonstrate the superiority of the N-th Root Stack.
ATTENUATION ANALYSIS OF VSP DATA Suprajitno Munadi
Scientific Contributions Oil and Gas Vol 10 No 2 (1987)
Publisher : Testing Center for Oil and Gas LEMIGAS

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29017/SCOG.10.2.1151

Abstract

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.
Co-Authors Ahmad Yusuf Bambang Wiyanto Djoko Rubyanto Djoko Sunarjanto Doma F. Prasetio Eko Susanto Fakhriyadi Saptono Julikah Julikah Lasmi Kustiowati Moh. Bunjamin Oki Hendriana Pambudi Pambudi Samsul Hidayat Sri Wijaya