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GeoBaikal 2018
- Conference date: August 11-17, 2018
- Location: Irkutsk, Russia
- Published: 11 August 2018
101 - 114 of 114 results
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The First Experience of Using Quanta Geo in the Clastic Formation of Eastern Siberia - a New Word in Imagers in Oil-based Mud
Authors A. Islamov, I. Safarov and L. ShakirzyanovSummaryIn 2017 large project was started by Gazpromneft-Angara in order to update geological model of clastic Vendean formation on several oil & gas field of Eastern Siberia. During project on exploration wells new technologies was used including newest for industry electrical borehole imager - Quanta Geo - high-resolution imager for oil-based mud. Physical limitations related to electrical properties of near well zone can be overcome by a detailed calibration on Core data. Images along with sedimentological Core description allowed detail characteristics of paleocurrent directions. From petrophysical point of view based on images high-resolution sand thicknesses was reliably estimated. One of the main discoveries was made on basis of sedimentological analysis, new trends of paleocurrents shows a much more complex picture and help with well-to-well correlation.
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New Data on the Facies Model of the Nepa Formation
Authors V.S. Vorobyev, K.V. Zverev, D.V. Khipeli, N.A. Ivanova and V.V. PustylnikovaSummaryThe main deposits from the point of view of reserves and development of the Chona field are the clastic deposits of the Nepa formation. Due to the high vertical and lateral anisotrophy of the layers the big work was done. Deep and complex analysis of new and old wells core, Well logs, 3D seismic, analogue deposits was made. The results allow us to take a new look at the geological structure and the exploration program of terrigenous strata. This concept was put in the basis of the drilling program and successfully confirmed by new wells.
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The Role of Secondary Processes in the Formation of Oil and Gas Fields at the Lena-tunguska Province
Authors V.S. Vorobyev, N.A. Ivanova, V.V. Pustylnikova and I.V. LitvinovaSummaryOn the core of the Ignyalinsky, Tympuchikansky, Vakunaysky and adjoining licence blocks, the comprehensive research program of the secondary processes of Nepskaya suite was carried out for the first time. For each of the facies, the reservoir quality, mineral and grain composition, the salinization degree of rocks by halite/anhydrite and carbonatization, recrystallization have been determined. The basic hypotheses of secondary processes was formed. Hypotheses were integrated with geophysical data. The forecast of collectors and zones of secondary mineral crystallization was made.
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Geological Modeling in Areas With Complex Thrust-faults Zones for Velocity Modeling During Seismic Processing
Authors A. Stepanov, D. Fedorova, S. Korneeva, O. Berkimbay and V. VorobyevSummaryVelocity modeling is one of the most important stage during the Post-Stack Depth Migration processing. There are more than twenty thrust faults in the seismic survey area. In this work Velocity model was made by 3D geological model processing for precisely detail modeling and saving important geological features which have influence into change velocity by section.
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Identification of Perspective Hydrocarbon Deposits in the Vendian Sedimentary Cover Nepa - Botuoba Anteclise Based on Seismic Inversions
Authors M. Balagurov and M. GabovaSummaryThe report highlights the results of analysis of core material, various laboratory studies on samples, complex interpretation of geological and geophysical information, including the calculation of seismic inversions performed for a detailed description and characterization of the Vendian terrigenous deposits of the Nepsky arch of the Nepa-Botuoba anteclise in order to identify promising oil and gas.
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Creation of a Petrophysical Model of the Upper Devonian Sediments of the Platform Part of Bashkortostan on the Basis of Lithofacies Analysis
Authors T. Burikova, O. Privalova, A. Kinzikeeva, A. Dvorkin, A. Nugaeva and R. MasagutovSummaryThe paper presents the correlation of identified lithologic heterogeneity and petrophysical properties of the Upper Devonian carbonate plays within the Republic of Bashkortostan.
The main criterion for differentiating petrophysical classes in the Upper Devonian carbonate sequence is proved to be the type of the void space in lithologically homogeneous rocks subject to secondary diagenetic changes. The petrophysical classes are characterized by their own rock physics parameters and correlation functions, invariables and regular cut-off values.
The developed petrophysical model will be used for reliable assessment of volumetric parameters in reserve calculations for the producing Upper Devonian platform carbonate plays in Bashkortostan.
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Analysis of the Effect of Structural Heterogeneity of the Carbonate Reservoirs on the Development Indicators
Authors G.R. Amineva, O.R. Privalova and K.D. ShumatbaevSummaryThe speaker paper considers the analysis of geological structure of Kashir and Podolsk Formations in Arlan oilfield and the development of this area. These formations occurred in uniform conditions of shallow marine shelf and marginal sea environment with alternating organogenic limestone, dolomite limestone and micro and fine-grained dolomites. The voids include primary and secondary pores, vugs and local microporosity. The dolomites are finegrained, micro-fine-grained. There are core samples from Arlan oilfield with microporosity up to 30% and permeability of about 0,01 μm2 having a large volume of bound water. Such rocks are named pelitomorphic.
Lithological and petrographic description of cores from Kashir and Podolsk formations recognized four petrotypes depending on rock structure and porosity.
Irregular alternation of pay zones of dolomites and limestone associated with not only irreducible saturation but a large transient zone with pelitomorphic rocks, containing bound, loosely bound water and free water defines the peculiarities of developing the pay zone. The research investigated the sensitivity of inflow mode to compartmentalization parameter given as a ratio of the number of net oil pays to total net oil pays and pelitomorphic layers in a pay zone. The criteria of forecasting the oil and oil-water inflow rates were recognized.
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The Petrophysical Models for Mature Fields With the New Data
Authors O. Privalova, K. Shumatbaev and G. AminevaSummaryThe basic prerequisites and factors leading to changes in petrophysical models of reservoirs of the fields at the late stage of development are considered on the example of oil fields of the platform part of Bashkortostan Republic in the Volga-Ural province. They are characterized by a limited complex of well log data, low and uneven removal of the core, lack of complex of the laboratory research, lack of accurate reference of the core to the depth. These disadvantages contributed to a significant difference in the approved parameters by the neighboring fields which are located in the same litho-facies zones. A prerequisite for reviewing of the reservoir model of the carbonate layer of Tournaisian Stage of some fields is a mismatch of the dynamics of watering in the oil deposits with equal effective thicknesses. Different rate of watering attests the heterogeneity of the reservoir. Analysis of production availability revealed deposits with low reserve multiplicity, while the decline in production in these deposits is not observed. The logical explanation is the underestimation of the pore volume. Significant factors which need to be taken into account for changing the traditional view of reservoir properties are noted during the revising of the petrophysical models. They include the problem of selection of analogues in conditions of low core removal, the typification of reservoirs by lithological and structural features, the influence of the properties of modern research (methods and techniques) of the core. Also the analysis of the influence of changes in the petrophysical model on the volumetric parameters which are obtained from the interpretation of geophysical well data is shown in this proposed article. The application of modern methodological approaches to the creation of petrophysical models leads to a differentiated assessment of the quality of the reservoir and should be accompanied by changes of dynamic parameters.
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Policy Shifting Towards New Regime of Production Sharing Contract
Authors T. Bramono and D.R. GalihSummaryIn 1960’s, Indonesia was starting to use Production Sharing Contract (“PSC”). Being the first country to enter to this model, the Government of Indonesia maintains the sovereignty of their petroleum resources. Cost of exploration and development will be recovered from production share if contractors manage to make a commercial discovery and commence production (“Cost Recovery”). After more than five decades using the PSC fiscal regime, in early 2017 Indonesia’s Ministry of Energy and Mineral Resources issued Regulation No. 8 of 2017 whereas new PSC contract must comply with new model PSC called Gross Split PSC (“Gross Split”). The new fiscal regime removes Cost Recovery from the system which has been the major feature of all PSC in Indonesia. Changing from production sharing base to revenue sharing base might change the whole game in upstream industries in Indonesia.
The paper is organized as follows: introduction, overview about PSC history and model in Indonesia. explaination the new fiscal regime called Gross Split, how the new fiscal regime (Gross Split) deal with problems in the industry.
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Single Domestic Gas Price Concept in Indonesia
Authors Z. Manan and A. HermawanSummaryThe paper is organized as follows: After the introduction, the second section gives a brief overview about domestic gas price in Indonesia. The third part of the paper will explain about gas distribution scheme, and in section four we will offer about single domestic gas price concept that can be applied in Indonesia.
This paper was undertaken to get the single gas price concept that can be applied in Indonesia. The method that used in this paper is literature and desk study to maping the gas distribution scheme, then calculate the Weighted Average Price (“WAP”) gas in every distribution scheme also the tariff based on cost of services per gas volume to obtain single gas price formula
First, the single gas price formula that can be applied even though different distribution scheme.
Second, the gas price differentiation still can be applied according to the gas distribution scheme
Indonesia should apply single gas price concept in order to make uniformity of gas prices in Indonesia and provide an institution that controls gas business in Indonesia
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Daily Variations in the Electric Field Potential Gradient During Fair Weather at the Observatory Mikhevo
By S. RiabovaSummaryChanging the Earth’s electric and magnetic fields in the diurnal time range is a hindrance when shooting using the natural field method, making it difficult to isolate the anomalies, linking profiles and tablets. In particular, there is a change in the daily course of fields over ore formations. The study of the dynamics of the natural electric field on engineering-geological objects (in the construction of tunnels, dams, roads and railways, etc.) will allow mapping tectonic disturbances characterizing modern tectonic activity. The results of observations of variations in the vertical strength component (potential graadient) of the Earth’s electric field at the Geophysical observatory "Mikhnevo" (54.959ºN; 37.766ºE) from 2015 to 2017 are analyzed. The average daily variation during fair weather showed a typical continental double wave variation with the first maximum between 10 and 12 LT and the second maximum at 22 LT. A positive correlation is established between the averaged diurnal variation at the observatory “Mikhnevo” and the unitary variation (Carnegie’s curve). In winter, daily values are lower compared to the summer period, and spring and autumn values are between them.
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Vibration Source “Batyr”, As a Result of Import Substitution of Foreign Technologies in the Field of Seismic Exploration
By R. IdiyatovSummaryJSC Bashneftegeofizika, the largest domestic oilfield services company with more than 85 years of history, is a group of high-tech companies that specialize in performing a wide range of geophysical research to develop and operate oil and gas fields.
Due to the wide spread of the idea of import substitution, Bashneftegeofizika JSC set itself the task of creating a domestic source of excitation of a seismic vibration signal, which by its characteristics will not be inferior to foreign analogues. Technical capabilities of our company allowed us to develop and launch our own vibrating installations “Batyr”. The tests performed showed the results corresponding to the task in hand.
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Modern Geophysical Investigation in Limits of Offshore Engineering Survey
Authors D.I. Chernikov, D.A. Naumenko and N.V. ParamonovSummaryThe article briefly presents the most important types of marine geophysical survey and their peculiarities that allow to solve in detail all the problems related to design and construction of temporary as well as permanent installations on the Arctic Shelf
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The Complex of Geophysical Methods to Exploration for Mineral Deposits in Wheathering Crusts
More LessSummaryThe main geophysical methods of prospecting, evaluation and exploration of the wheathering crusts are: magnetic survey; near-surface resistivity survey (ground penetrating radar - georadar-sounding; radiowavws sounding - RWS, frequency electromagnetic sounding - FES, sounding of induction polarization - IP, the sounding in the near zone - Team - FAST); near-surface seismic survey of method of refracted waves. As helper methods you can use methods such as: vertical electrical sounding (VES); electrical profiling DC (EP-DC); high-precision gravity surveys; radiometric, etc. Used complex of geophysical studies depends on the detail of the work, tasks assigned, the specific characteristics and the degree of certainty the territory. Also geophysical methods used for search and exploration of indigenous sources of placer. Use to made determination the total power of the intercession of loose sediment, lithological dissection and identification of structures of loose cover, research of the nature of the relief bedrock, the detection position of the buried valleys. It should repeat that the application of geophysical methods on placer ore objects can be geologically effectively only for complex of methods. Each individual method gives anomalies both and over ore objects and over “false”. This results in waste of material resources in the certification of geophysical anomalies by drilling and mining.
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