Workflow of Petrophysical Analysis Performed at Mine in Karaganda Coal Basin

2021 ◽  
Author(s):  
Makpal Bektybayeva ◽  
Nurhat Mendybaev ◽  
Asfandiyar Bigeldiyev ◽  
Subhro Basu ◽  
Auez Abetov ◽  
...  
Keyword(s):  
Soviet Union ◽  
Former Soviet Union ◽  
Coalbed Methane ◽  
Proximate Analysis ◽  
Ash Content ◽  
Gas Content ◽  
Coal Bed ◽  
Integrated Analysis ◽  
Coal Beds ◽  
Lithology Identification

Abstract For accurate coal bed methane (CBM) reserves estimation, it is necessary to evaluate reservoir characteristics. We present a workflow for formation evaluation of coalbed-methane wells, by interpretation of a limited number of legacy logs, including data preprocessing, lithology identification, proximate analysis and estimation of gas content of coal beds. This workflow allowed the estimation of ash content from the available logs, including selective log (analogue of photoelectric absorption), which was recorded only on the territory of the former Soviet Union and never used for such calculations before. Even though the logs were recorded by old tools with low vertical resolution, we were able to identify heterogeneity of coal seams, using the principle of core ash content distribution. Integrated analysis of old core data and recent laboratory measurements of samples from coal pillars allowed to calculate proximate properties of the coal, which showed good match with observed data and could be considered as input parameters for property distribution in the geological model. Also, it is worth to mention that an advanced plug-in was deployed to perform calculation of proximate properties and gas content for all available options and to significantly reduce time for screening different algorithms and rapidly analyzing results.

Quantitative analysis of coal-bed methane components by downhole laser Raman spectroscopy

2021 ◽  
pp. 1-24
Author(s):  
Heng Wang ◽  
Lifa Zhou ◽  
Wang Yuxia
Keyword(s):  
Raman Spectroscopy ◽  
Coalbed Methane ◽  
Molecular Structures ◽  
Spectral Lines ◽  
Gas Content ◽  
Laser Raman Spectroscopy ◽  
Coal Bed ◽  
Laser Raman ◽  
Coiled Tubing ◽  
Ct System

Laser Raman spectroscopy can be used to acquire the unique fingerprint of a specific molecule, and it is widely used to identify substances and study the spectral line characteristics of molecular structures. The measurement of coalbed methane (CBM) content is essential in the exploration and development of CBM fields for optimizing the fracture design. For this purpose, laser Raman spectroscopy can be extremely beneficial because it detects the gas content rapidly and accurately. Moreover, conventional gas content testing methods are laborious, time-intensive, expensive, and yield inaccurate results. Therefore, we integrated a laser Raman spectroscopy system with a coiled tubing (CT) equipment for downhole deployment in gas wells to accurately determine the CBM content in situ. The developed system can directly determine the CBM content at a specific location in the target layer. The trace test characteristics enable this system to rapidly detect downhole gas components and contents. The real-time detection data are transmitted via a cable to a computer on the surface and are processed using a baseline correction algorithm and data enhancement algorithm. Fourier transform and wavelet transform are used to identify the Raman spectral lines, while analysis of Raman spectra is used to determine CBM content. By employing this equipment, we can shorten the cycle of depressurization, drainage, and recovery processes from multiple days to just a few hours. Furthermore, the integrated laser Raman spectroscopy-CT system enables a flexible operation and possesses strong site operability, making it suitable for complex and high-risk wells.

scholarly journals Geochemical investigation of hydrocarbon generation potential of coal from Raniganj Basin, India

2021 ◽  
Vol 11 (10) ◽  
pp. 3627-3636
Author(s):  
D. S. Panwar ◽  
Ram Chandra Chaurasia ◽  
V. K. Saxena ◽  
A. K. Singh ◽  
Akanksha
Keyword(s):  
Gas Content ◽  
Coal Bed ◽  
Hydrocarbon Generation ◽  
Type Iii ◽  
Coal Beds ◽  
Petrographic Examination ◽  
Raniganj Coalfield ◽  
Geochemical Investigation ◽  
A Minor ◽  
Van Krevelen Diagram

AbstractMethane content in a coal seam is a necessary parameter for evaluating coal bed gas, and it poses an environmental risk to underground coal mining activities. Keeping in pace with comprehensive studies of coal bed gas, 12 coal samples were selected from the Sitarampur block of Raniganj Coalfield for analysis. The Petrographic examination illustrated that significant values of reactive macerals present in samples demonstrate that organic matter is dominated by the prominent source of aromatic hydrocarbons with a minor proportion of aliphatic hydrocarbon, which falls in the region of (Type III) kerogen, confirms the suitability for the potential of hydrocarbon generation. “A” factor (aliphatic/aromatic bands) and “C” factor (carbonyl/carboxyl bands) value concluded that the sample has the lowest aromaticity and the highest hydrocarbon-generating potential, which was also validated by the Van Krevelen diagram. The Van Krevelen diagram plots between the H/C and O/C ratio indicate that coal samples lie in the type III kerogen, and bituminous coal (gas prone zone) is present in the block, which is confirmed by the cross-plot between desorbed and total gas (cc/g). The in situ gas content values are high enough to produce methane from coal beds. The overall study concludes that the Sitarampur block from Raniganj Coalfield is suitable for hydrocarbon generation and extraction.

The Broad Concept and Resource Calculation Method of Coalbed Methane

2014 ◽  
Vol 962-965 ◽  
pp. 185-188
Author(s):  
Wei Hou ◽  
Fang Zhang
Keyword(s):  
Coal Seam ◽  
Calculation Method ◽  
Coalbed Methane ◽  
Surrounding Rock ◽  
Gas Content ◽  
Coal Bed ◽  
Broad Concept

It has become the focus of debate about Coalbed Methane (CBM) concept whether the surrounding rock is reservoir. The gas content of surrounding rock is considerable, and it may become valuable exploration targets. In lateral, the gas content of surrounding rock is negatively related with coal bed. In vertical, the closer distance between coal seam and surrounding rock is, the higher gas content is. The broad CBM is defined as the gas that mainly originates from coal, mainly exists in the coal seam, and also widely exists in the surrounding rock. The method of volume and capacity are used to resource calculation.

Research on Main Control Factors of Coalbed Methane Reservoir Formation in Turpan-Hami Basin

2011 ◽  
Vol 233-235 ◽  
pp. 2201-2204 ◽  
Author(s):  
Gui Zhong Li ◽  
Hong Yan Xu ◽  
Bo Wang ◽  
Ze Deng ◽  
Meng Geng
Keyword(s):  
Coalbed Methane ◽  
Structural Evolution ◽  
Coal Bed ◽  
Coal Rank ◽  
Hydrogeological Condition ◽  
Gas Reservoirs ◽  
Coal Resources ◽  
Coal Beds ◽  
Control Factors ◽  
Coalbed Methane Reservoir

Turpan-Hami Basin is a typical low coal rank coal bearing basin in China, with coal resources accounting for 50% of the total low coal rank resources. Structural evolution of the basin plays important controlling roles to generation；Fan delta and braided delta deposit systems are thick and stable sedimentary systems which are favorable for coal beds development；Hydrogeological condition is a major force for the adjustment and construction of coal-bed gas reservoirs.

Research the Structural Feature of Jibei Mining Area to Control the Gas Bearing

2012 ◽  
Vol 260-261 ◽  
pp. 284-289
Author(s):  
Hai Yan Liu ◽  
Zeng Xue Li ◽  
Da Wei Lv ◽  
Dong Dong Wang ◽  
Wen Feng Ning
Keyword(s):  
Structural Feature ◽  
Mining Area ◽  
Gas Content ◽  
Coal Bed ◽  
Coal Production ◽  
Coal Beds ◽  
Wide Range ◽  
Local Areas ◽  
The One ◽  
Gas Bearing

The mining area of Jibei is an important coal production base, which located at the northern of Jining coalfield in Shandong province. The coal beds have the wide range of distribution and thicker sedimentary thickness in Shanxi Formation. The influence of structural feature to control the gas bearing in 3 coal bed is the paper’s important content. Two conclusions can be drawn from this study. The one is that open faults in whole area facilitate gasgascoal bed gas emitted from coal bed. The other is that closed faults in the local areas hinder gas emitted from coal bed. So, the laws are that the coal bed gas content and emission quantity are generally low in the whole mining area, but higher in parts area, and there are the abnormal gas zones at the special locations, where closed faults location.

scholarly journals Effect of the Hydrate Saturation of the Pores of Coal Bed on the Gradient of Gas Pressure and the Rise of Outburst Danger

2019 ◽  
Vol 105 ◽  
pp. 01044 ◽  
Author(s):  
Vyacheslav Smirnov ◽  
Valery Dyrdin ◽  
Tatyana Kim ◽  
Andrey Manakov
Keyword(s):  
Experimental Data ◽  
Marginal Zone ◽  
Pore Space ◽  
Gas Pressure ◽  
Gas Content ◽  
Coal Bed ◽  
Substantial Fraction ◽  
Coal Beds ◽  
Hydrate Saturation ◽  
Major Factors

A substantial fraction of methane in undisturbed coal beds is present in the condensed latent state, so that methane evolution from coal may be not always quantitatively predicted reliably. On the basis of experimental data, an equation expressing the amount of gas hydrate through the sorption capacity and actual humidity of coal is obtained. Analysis showed that the gradient of gas pressure in the marginal zone of a coal bed is linearly dependent on the saturation of the pore space with the hydrate. The high gradient of gas pressure and high gas content of coal beds along with local disruption of coal and re-distribution of rock pressure are the major factors causing instantaneous outbursts of coal and gas.

scholarly journals EVALUATION OF INITIAL GAS VOLUME OF COALBED METHANE USING FOUR METHOD

2019 ◽  
Vol 3 (1) ◽  
pp. 28
Author(s):  
Heri Susanto ◽  
Karen Sondakh ◽  
Ratnayu Sitaresmi ◽  
Ryodi Hananda
Keyword(s):  
Coalbed Methane ◽  
Alternative Energy ◽  
Volatile Matter ◽  
Gas Content ◽  
Coal Bed ◽  
Coal Bed Methane ◽  
Resource Potential ◽  
Volume Calculation ◽  
Initial Volume ◽  
Gas Volume

<p>Coal bed methane (CBM) is an unconventional energy resources in which the main ingredient is methane gas formed in the process of formation of coal (coalification). Based on research Advance Resource International inc. (ARI), the CBM resource potential is 453 Tcf spread across 11 basins in Indonesia. CBM technology is expected to be one of the alternative energy can play a role in helping to suppress the natural gas needs of oil as one of the energy commodities di Indonesia.<br />This paper discusses about a calculated initial volume of gas in place (Gas in Place) on CBM reservoir “X” field. This initial gas volume calculation first calculating the gas content is becoming an important parameter in calculating the initial volume. This content gas value can be obtained through data analysis proximate such as ash content, moisture content, volatile matter, fixed carbon which such data can be obtained from laboratory results. But there is also the calculation of the gas content which can be obtained by simply using coal density data using several methods of calculation, such as the Mavor method, Bambang, Modified Kim, and Mullen method. In the “X” field there are five wells coalbed methane drilling has been done, namely, SS-1, SS-2, SS 3, SS-4 and SS-5 and there are five layers are seam-1, seam-2, seam-3, seam-4, and seam-5. Based on the calculations were also obtained in the “X” field coal rank, the average is sub-bitminous. Of the five wells will be calculated gas content and the initial volume of gas using a method Mavor, Bambang, Modified Kim, and Mullen.<br />Using four methods then the gas content in the SS well ranged between 200-500 SCF / ton. And assuming that the well drainage area (A) covering an area of 100 acres, the obtained large volumes of coal bed methane wells SS-1 with the four methods ranged from 3-9 BSCF, the SS-2 ranged between 1-3 BSCF, wells SS- 3 are 2-5 BSCF, the SS-4 range between 1-3 BSCF and the SS-5 ranges between 1-3 BSCF.<br />We will be compared the initial gas volume in the Field “X” using the four methods with data from the laboratory result. From that analysis it can be proved that the Bambang method is the most suitable method and represents CBM field in Indonesia. So the initial gas volume in Field “X” is using the result from Bambang method, and the result are 5312.17 MMscf on the SS-1well, 2385.77 MMscf on the SS-2 well, 3330.84 MMscf on the SS-3 well, 1635.44 MMscf on the SS-4 well, and 1608.74 MMscf on the SS-5 well. And the total initial gas volume in the “X” Field is 14273 MMSCF.</p>

scholarly journals Petrophysical Investigation of Hydrocarbon Generation Potential of Coal from Raniganj Basin, India

2021 ◽  
Author(s):  
Deepak Singh Panwar ◽  
Ram Chandra Chaurasia ◽  
V K Saxena ◽  
A K Singh ◽  
Akanksha .
Keyword(s):  
Gas Content ◽  
Coal Bed ◽  
Hydrocarbon Generation ◽  
Type Iii ◽  
Coal Beds ◽  
Kerogen Type ◽  
Petrographic Examination ◽  
The Cross ◽  
Raniganj Coalfield

Abstract Methane content in a coal seam is a necessary parameter for evaluating coal bed gas, and it is a threat to underground coal mining activities from environmental aspects. Keeping in pace with comprehensive studies of coal bed gas, the authors had selected 12 coal samples from the Sitarampur block of Raniganj Coalfield. The Petrographic examination illustrated that significant values of reactive macerals present in samples demonstrate that organic matter is dominated by kerogen Type III, making it suitable for hydrocarbon generation. “A” factor (aliphatic/aromatic bands) and “C” factor (carbonyl/carboxyl bands) value concluded that the sample has the lowest aromaticity and the highest hydrocarbon-generating potential, which also validated by the cross plot between atomic H/C and O/C. The plots between the H/C and O/C ratio in the Van Krevelen diagram indicate that the coal samples lie in the type III kerogen, and bituminous coal (gas prone zone) is present in the block, which confirmed by the cross plot between desorbed and total gas (cc/g). The in-situ gas content values are high enough to produce methane from coal beds. The overall study concludes that the Sitarampur block from Raniganj Coalfield is suitable for hydrocarbon generation and extraction.

Marital Stability Among Jewish and Mixed Couples Following Immigration to Israel From the Former Soviet Union

2012 ◽  
Vol 17 (2) ◽  
pp. 158-167 ◽  
Author(s):  
Yoav Lavee ◽  
Ludmila Krivosh
Keyword(s):  
Soviet Union ◽  
Cultural Identity ◽  
Social Adjustment ◽  
Former Soviet Union ◽  
Marital Stability ◽  
Marital Instability ◽  
Factors Associated ◽  
Mixed Marriages ◽  
Marital Outcomes ◽  
Jewish Immigrants

This research aims to identify factors associated with marital instability among Jewish and mixed (Jewish and non-Jewish) couples following immigration from the former Soviet Union. Based on the Strangeness Theory and the Model of Acculturation, we predicted that non-Jewish immigrants would be less well adjusted personally and socially to Israeli society than Jewish immigrants and that endogamous Jewish couples would have better interpersonal congruence than mixed couples in terms of personal and social adjustment. The sample included 92 Jewish couples and 92 ethnically-mixed couples, of which 82 couples (40 Jewish, 42 mixed) divorced or separated after immigration and 102 couples (52 Jewish, 50 ethnically mixed) remained married. Significant differences were found between Jewish and non-Jewish immigrants in personal adjustment, and between endogamous and ethnically-mixed couples in the congruence between spouses in their personal and social adjustment. Marital instability was best explained by interpersonal disparity in cultural identity and in adjustment to life in Israel. The findings expand the knowledge on marital outcomes of immigration, in general, and immigration of mixed marriages, in particular.

The Contribution of Pavlov's Typology of CNS Properties to Personality Research

1997 ◽  
Vol 2 (2) ◽  
pp. 125-138 ◽  
Author(s):  
Jan Strelau
Keyword(s):  
Soviet Union ◽  
Former Soviet Union ◽  
Animal Species ◽  
Special Significance ◽  
The West ◽  
Personality Dimensions ◽  
Personality Research ◽  
Personality Theories ◽  
Strength Of Excitation ◽  
Point Of Departure

This paper presents Pavlov's contribution to the development of biological-oriented personality theories. Taking a short description of Pavlov's typology of central nervous system (CNS) properties as a point of departure, it shows how, and to what extent, this typology influenced further research in the former Soviet Union as well as in the West. Of special significance for the development of biologically oriented personality dimensions was the conditioned reflex paradigm introduced by Pavlov for studying individual differences in dogs. This paradigm was used by Russian psychologists in research on types of nervous systems conducted in different animal species as well as for assessing temperament in children and adults. Also, personality psychologists in the West, such as Eysenck, Spence, and Gray, incorporated the CR paradigm into their theories. Among the basic properties of excitation and inhibition on which Pavlov's typology was based, strength of excitation and the basic indicator of this property, protective inhibition, gained the highest popularity in arousaloriented personality theories. Many studies have been conducted in which the Pavlovian constructs of CNS properties have been related to different personality dimensions. In current research the behavioral expressions of the Pavlovian constructs of strength of excitation, strength of inhibition, and mobility of nervous processes as measured by the Pavlovian Temperament Survey (PTS) have been related to over a dozen of personality dimensions, mostly referring to temperament.

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