Formation conditions of organic porosity in low-permeability shale strata

2019 ◽  
pp. 13-18
Author(s):  
V. Yu. Kerimov ◽  
◽  
V. A. Kosyanov ◽  
R. N. Mustaev ◽  
D. D. Ismailov ◽  
...  
Keyword(s):  
Low Permeability ◽  
Formation Conditions ◽  
Organic Porosity

scholarly journals Geochemical conditions of hydrocarbon accumulation in low-permeability shale sequences

2019 ◽  
Vol 98 ◽  
pp. 02005
Author(s):  
Vagif Kerimov ◽  
Rustam Mustaev ◽  
Uliana Serikova ◽  
Javidan Ismailov
Keyword(s):  
Retention Volume ◽  
Low Permeability ◽  
Hydrocarbon Accumulation ◽  
Shale Formations ◽  
Geochemical Conditions ◽  
The World ◽  
Organic Porosity ◽  
Kerogen Porosity ◽  
Rock Eval ◽  
Gas Bearing

The report is devoted to the study of conditions for the formation of organic porosity–void spaces of organic origin formed during transformation of the organic matter into hydrocarbons, and their role in the formation of hydrocarbon accumulation in low-permeability shale strata. The experience of studying and developing known shale formations of the world testifies to the fact that such strata are hybrid phenomena, that is, they are both oiland gas-bearing strata containing traditional and non-traditional accumulations of hydrocarbons. Based on the results of the programmed pyrolysis by the Rock-Eval-6 method, an estimate has been performed to quantify organic (kerogen) porosity. This estimate allows for determining the forecast retention volume of HCs generated during catagenesis.

Study of Optimization Method for Variable-Density Completion of Horizontal Well

2013 ◽  
Vol 448-453 ◽  
pp. 3954-3957
Author(s):  
Liu Jia ◽  
Li Lu ◽  
Bao Jian Du
Keyword(s):  
Horizontal Well ◽  
Optimization Methods ◽  
Coupling Model ◽  
Optimization Method ◽  
Variable Density ◽  
Low Permeability ◽  
Model Optimization ◽  
High Permeability ◽  
Formation Conditions ◽  
Homogeneous Formation

Based on Landman variable density perforation model, a horizontal well variable-density completion coupling model is derived under non-homogeneous formation conditions. And an actual well is taken for example to calculate the production fluid profile of horizontal well under different perforation densities. The results show that the production fluid profile of the high and low permeability section tends to be even with the decrease of the perforation density of the high-permeability section. Based on the coupling model, optimization methods for the variable-density completion of horizontal well under uneven stratum conditions are put forward. The production fluid profiles of optimized perforation model, actual perforation model, and even perforation model are compared. According to the results, the horizontal well corresponding to the optimized perforation model is with the most balanced inflow profile.

Studies on Applying Acid Compositions to Treat the Western Siberian Field Bottomhole Formation Zone

2018 ◽  
Vol 785 ◽  
pp. 77-87
Author(s):  
Ivan Nesterov ◽  
Marsel Kadyrov ◽  
Alexander Markov ◽  
Denis Drugov ◽  
Vladimir Zapevalov
Keyword(s):  
Mineralogical Composition ◽  
Laboratory Research ◽  
Low Permeability ◽  
Acid Effect ◽  
Formation Zone ◽  
Porosity And Permeability ◽  
Optimum Reaction ◽  
Formation Conditions ◽  
Effective Development ◽  
Low Permeability Reservoirs

Effective development of oil deposits includes the measures to restore and improve the porosity and permeability properties (PPP) of reservoir units, which inevitably deteriorate during the operation of the field. For this purpose, various technologies of bottomhole formation zone acid treatment (BFZAT) are used. These approaches are sufficiently developed and usually do not require additional laboratory adaptation. Specific requirements for technologies that include acid effect on the formation are required for interventions on low-permeability reservoirs (LPR), where the influence of the mineralogical composition of rocks and their porosity and permeability properties on the efficiency of BFZAT is the most significant. Therefore, during interventions development for LPR using acid methods, it is necessary to correctly assess the capabilities of a particular method (composition) in relation to specific conditions. This can be achieved by conducting standard laboratory tests (determination of rock carbonation and mass loss in 12% hydrochloric acid) and additional experiments to determine the mass of the secondary sediment, as well as the optimum reaction time at the formation temperature. The research objective is a laboratory research on the selection of acid compositions for bottomhole formation zone treatment for a number of low-permeability reservoirs in Western Siberia. Standard and special laboratory studies have allowed suggesting the most optimum acid compositions adapted to “rigid” formation conditions.

A UNIQUE FINDING OF ZIRCON INTO BADDELEYITE TRANSFORMATION (THE ICHETJU ORE OCCURRENCE, THE MIDDLE TIMAN)

2018 ◽  
pp. 27-35
Author(s):  
S. G. Skublov ◽  
A. O. Krasotkina ◽  
A. B. Makeyev ◽  
O. L. Galankina ◽  
A. E. Melnik
Keyword(s):  
High Temperature ◽  
Experimental Studies ◽  
Middle Timan ◽  
Natural Analogues ◽  
Opposite Situation ◽  
Formation Conditions

Findings of the growth relationships between baddeleyite and zircon are rare, due to significant differences in the formation conditions of the minerals. A reaction replacement (partial to complete) of baddeleyite by zircon is possible during metamorphism accompanied by the interaction with high-Si fluids. The opposite situation, when zircon is replaced by baddeleyite, is extremely rare in the nature. Transformation of zircon from polymineral (compound) ore occurrence Ichetju (the Middle Timan) with the formation of microaggregates of baddeleyite, ratile and florencite has been found out. The size of the largest segregations of baddeleyite does not exceed 10 microns in diameter. Microaggregates are unevenly related to the rim of zircon with a thickness of 10 to 50 rfn, voids and cracks across the grain. Altered zircon rim (a mixture of newly formed minerals) is characterized by sharply increased composition of REE (especially LREE), Y, Nb, Ca, Ti. The composition of Th and U also increases. An overview of the experimental studies on the reaction between zircon and baddeleyite and single natural analogues allows to make a conclusion that the most likely mechanism of the transformation of zircon from ore occurrence Ichetju to baddeleyite (intergrowth with ratile and florencite) is due to the effect of interaction of primary zircon with high-temperature (higher than 500—600°C) alkaline fluids transporting HFSE (REE, Y, Nb, Ti). This is indirectly confirmed by the findings of zircon with anomalous high composition of Y and REE up to 100000 and 70000 ppm respectively.

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