scholarly journals Distribution of organic matter and evaluation of brittleness index of the Lower Silurian shales of west Lithuania based on interpretation of well logs

Baltica ◽  
2020 ◽  
Vol 33 (2) ◽  
pp. 146-165
Author(s):  
Saulius Šliaupa ◽  
Jurga Lazauskienė ◽  
Saulius Lozovskis ◽  
Rasa Šliaupienė
Keyword(s):  
Organic Matter ◽  
Gamma Ray ◽  
Organic Matter Content ◽  
Matter Content ◽  
Black Shales ◽  
Well Logs ◽  
Brittleness Index ◽  
Lower Silurian ◽  
Combined Application ◽  
Area Of Interest

There is little known of the basic parameters of the Lower Silurian graptolitic black shales that are considered the most prospective unconventional gas reservoir in west Lithuania, situated in the deep central part of the Baltic sedimentary basin. Hundreds of deep oil exploration wells have been drilled in the area of interest, owing to extensive exploration of oil fields. The lower and middle Llandovery interval was mainly drilled with coring, while most of the section was covered by only logging. Therefore, the knowledge of major parameters of the Lower Silurian shales is rather obscure and is based on scarce rock sample data. The gamma-ray, electrical resistivity and sonic logs were utilised, together with mineralogical studies of rock samples to document vertical and lateral distribution of organic matter. Also, the brittleness index was defined to characterise the whole Lower Silurian section. Some unexpected trends were identified that may redirect exploration strategy in west Lithuania. The combined application of mineralogical studies and well logs indicate a much higher exploitation quality of the Lower Silurian shales than previously believed. A higher organic matter content and brittleness were derived from logging data in the Lower Silurian shales.

scholarly journals Contribution A La Caracterisation Diagraphique Des Depots Carbonates Du Cretace Du Bassin Sedimentaire De Cote D’ivoire

2016 ◽  
Vol 12 (33) ◽  
pp. 391
Author(s):  
Yao Kouadio Cyrille ◽  
Kouassi Kouamé Alfred ◽  
Boga Atabli Hervé ◽  
Monde Sylvain ◽  
Digbehi Zéli Bruno ◽  
...  
Keyword(s):  
Organic Matter ◽  
Cote D'ivoire ◽  
Côte D’Ivoire ◽  
Gamma Ray ◽  
Organic Matter Content ◽  
Sedimentary Facies ◽  
Matter Content ◽  
Cote D’Ivoire ◽  
Côte D'ivoire ◽  
Sonic Log

To know the petrophysical characteristics associated with sedimentary facies gammay ray logs providing information on the natural radioactivity of sedimentary rocks and the sonic logs which document on facies and petrophysical variations rocks were studied. This study focused on three (3) wells (BH-X, DH-X and MR-X) bored in the offshore basin of Abidjan margin (Côte d’Ivoire) for which the lithogy is constituted of clay alternating with sand an sandstone at the base surmounted by limestone and marls which are covered by clay series. It reveals that two deposits phases occurred during the carbonate sedimentation. Through the gamma ray logs, it appears that the clay phases have low radioactivity, which often progress to average values. This radioactivity recorded in clays would be linked to the low organic matter content and leaching reworked elements. In marl phases radioactivity is medium to high indicating a high content of uranium, thorium and potassium deriving from clay minerals. The gamma ray log varies significantly in limestone phases reflecting the heterogeneity of deposits. Strong radioactivity values in some limestone layers are related to their homogeneity and the present of organic matter. Fluctuations result from long-term changes in submarine hydrothermal flow and may indicate significant variations in facies (crystalline limestone, marl and clay). There are more or less dolomitised layers alternating with more homogeneous chemical limestone benches, biogenic limestone debris of organisms and past clay. The sonic log has two phases in the marl and limestone interval. In the marl phase, the acoustic wave velocity is almost constant, but in the limestone phase velocities fluctuate. Indeed, marl interval contains heterogeneous deposits. Generally the velocity is still low in impermeable and little porous clay. In marls, relatively high propagation velocity implies that they are less penetrable as clays because of the presence of fluid. The sonic log fluctuations in the limestone stage reflect the heterogeneity of deposits. Calcareous layers generally have a shorter time of wave propagation, suggesting that they are indurated, recrystallized and homogeneous. By against certain layers are poorly penetrable and show the presence of fluid. The limestone is fractured, so more porous than clay and marl. The porosity may be related to diagenesis after being dessoluted.

scholarly journals Vitrinite Equivalent Reflectance Estimation from Improved Maturity Indicator and Well Logs Based on Statistical Methods

Energies ◽  
2021 ◽  
Vol 14 (19) ◽  
pp. 6182
Author(s):  
Sebastian Waszkiewicz ◽  
Paulina I. Krakowska-Madejska
Keyword(s):  
Organic Matter ◽  
Organic Matter Content ◽  
Matter Content ◽  
Well Logs ◽  
Correct Determination ◽  
Study Interval ◽  
Resistivity Log ◽  
Hydrocarbon Deposits

Estimation and correct determination of vitrinite equivalent reflectance in rock is crucial for the assessment of the source rock in both conventional and unconventional hydrocarbon deposits. These parameters can be determined in laboratories on rock samples. Laboratory measurements provide only point information. However, the use of well logs could overcome discontinuities in the data and provide parameters throughout a study interval. Attention has been paid to the estimation of TOC based on well logs. Vitrinite equivalent reflectance estimation is less well discussed and most papers reported cases with high TOC content in analyzed deposits. In this paper, the estimation of improved Ro is presented using a calculated maturity indicator with well logs. As the organic matter content is not high, additional steps were required for the calculation. To improve the quality of the fit and to find similar intervals, the data were grouped using cluster and neural network analysis. The next step was to use the resistivity log to improve the obtained maturity indicator. Due to the changing properties of kerogen with the type and degree of thermal maturity, this approach turned out to be reliable. The use of resistivity significantly increased the correlation coefficient and reduced errors. The method was tested on two wells with different type and maturity of kerogen. The obtained results are satisfactory, which makes it possible to use the method even in formations with a low organic matter content.

scholarly journals Effects of organic manures and chemical fertilizers on the yield of brinjal and soil properties

1970 ◽  
Vol 6 (2) ◽  
pp. 271-276 ◽  
Author(s):  
MS Ullah ◽  
MS Islam ◽  
MA Islam ◽  
T Haque
Keyword(s):  
Organic Matter ◽  
Soil Properties ◽  
Combined Treatment ◽  
Organic Matter Content ◽  
Poultry Manure ◽  
Matter Content ◽  
Mustard Oil ◽  
Chemical Fertilizers ◽  
Chemical Application ◽  
Combined Application

A field experiment was conducted at the Horticultural Farm of Bangladesh Agricultural University (BAU), Mymensingh during the period from December 2004 to April 2005 to evaluate the effect of manures and fertilizers on the yield of brinjal. There were five treatments consisting of organic, inorganic and combined sources of nutrients, of which the combined treatment (60 % organic +40% inorganic) showed the best performances. The maximum branching (20.1) with the highest number fruits/plant (15.2), fruit length (14.1 cm) and fruit diameter (4.3 cm) were found combined application of manures and fertilizers. The highest yield (45.5 t ha-1) was also obtained from the combined application of organic and inorganic sources of nutrients. Application of mustard oil cake or poultry manure alone gave better performance compared to only chemical fertilizers. The organic matter content and availability of N, P, K and S in soil were increased by organic matter application. On the other hand soil pH was increased with chemical application than organic. Keywords: Manure; Fertilizer; Yield; Brinjal; Soil properties DOI: 10.3329/jbau.v6i2.4821 J. Bangladesh Agril. Univ. 6(2): 271-276, 2008

HEAVY METAL SPECIATION IN BOTTOM SEDIMENTS OF THE VYSHNEVOLOTSKY RESERVOIR

2018 ◽  
pp. 46-54
Author(s):  
O. A. Lipatnikova
Keyword(s):  
Heavy Metal ◽  
Organic Matter ◽  
Bottom Sediments ◽  
Metal Speciation ◽  
Organic Matter Content ◽  
Water Reservoir ◽  
Matter Content ◽  
Heavy Metal Speciation ◽  
Mobile Forms ◽  
Manganese Hydroxides

The study of heavy metal speciation in bottom sediments of the Vyshnevolotsky water reservoir is presented in this paper. Sequential selective procedure was used to determine the heavy metal speciation in bottom sediments and thermodynamic calculation — to determine ones in interstitial water. It has been shown that Mn are mainly presented in exchangeable and carbonate forms; for Fe, Zn, Pb и Co the forms are related to iron and manganese hydroxides is played an important role; and Cu and Ni are mainly associated with organic matter. In interstitial waters the main forms of heavy metal speciation are free ions for Zn, Ni, Co and Cd, carbonate complexes for Pb, fulvate complexes for Cu. Effects of particle size and organic matter content in sediments on distribution of mobile and potentially mobile forms of toxic elements have been revealed.

Physico-Chemical Properties of Soil Collected from Chandrabhaga River in Kalmeshwar, Nagpur, Maharashtra

2020 ◽  
Vol 07 (02) ◽  
pp. 1-3
Author(s):  
Amita M Watkar ◽  
Keyword(s):  
Organic Matter ◽  
Soil Quality ◽  
Agricultural Land ◽  
Organic Matter Content ◽  
Chemical Properties ◽  
Matter Content ◽  
Soil Attributes ◽  
Essential Components ◽  
Agricultural Land Management ◽  
Physical And Chemical

Soil, itself means Soul of Infinite Life. Soil is the naturally occurring unconsolidated or loose covering on the earth’s surface. Physical properties depend upon the amount, size, shape, arrangement, and mineral composition of soil particles. It also depends on the organic matter content and pore spaces. Chemical properties depend on the Inorganic and organic matter present in the soil. Soils are the essential components of the environment and foundation resources for nearly all types of land use, besides being the most important component of sustainable agriculture. Therefore, assessment of soil quality and its direction of change with time is an ideal and primary indicator of sustainable agricultural land management. Soil quality indicators refer to measurable soil attributes that influence the capacity of a soil to function, within the limits imposed by the ecosystem, to preserve biological productivity and environmental quality and promote plant, animal and human health. The present study is to assess these soil attributes such as physical and chemical properties season-wise.

scholarly journals Soil nitrogen supply of peat grasslands estimated by degree days and soil organic matter content

2020 ◽  
Vol 117 (3) ◽  
pp. 351-365
Author(s):  
J. Pijlman ◽  
G. Holshof ◽  
W. van den Berg ◽  
G. H. Ros ◽  
J. W. Erisman ◽  
...  
Keyword(s):  
Organic Matter ◽  
Soil Organic Matter ◽  
Soil Nitrogen ◽  
Organic Matter Content ◽  
Matter Content ◽  
Nitrogen Supply ◽  
Degree Days ◽  
Soil Organic Matter Content ◽  
Soil Nitrogen Supply
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