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Rock Mechanics Bulletin 2024年第2期3卷 21-38页

作者： Romulus Mawa Tuzingila Lingyun Kong ruben koy kasongo Key Laboratory of Theory and Technology of Petroleum Exploration and Development in Hubei Province China University of GeosciencesWuhan 430074China Key Laboratory of Tectonics and Petroleum Resources(Ministry of Education) China University of GeosciencesWuhan 430074China Department of Petroleum Engineering College of Earth ResourcesChina University of GeosciencesWuhanChina Faculty of Oil Gas and Renewable EnergyDepartment of Exploration and ProductionUniversity of KinshasaDemocratic Republic of the Congo Faculty of Science Department of GeosciencesUniversity of KinshasaDemocratic Republic of the Congo

Understanding the effects of mineral composition on geomechanical characteristics is critical in order to design and optimize the hydraulic fracturing necessary for shale gas reservoir *** information is still missing in effects of mineral content and the experimental methodologies *** paper provided an in-depth assessment of the various experimental methodologies and their applications in the relationship between the mineralogical and geomechanical features of the shale *** results revealed that more brittle minerals increase their strength,but chemical reaction that creats pores decrease their *** content of carbonate or quartz increases a rock's brittleness,while a high content of clay increases a rock's plasticity and decreases its *** phyllosilicate content increases,the uniaxial compressive strength decreases,and this could be because phyllosilicate minerals have a weakening effect on the mineral ***'s modulus often climb as clay minerals decline and as silica with carbonate concentration rises,however Poisson's ratio increases in relation to an increase in clay minerals,which also increases the ductility of the reservoir shale ***,compared to minerals and matrix,does not significantly impact the strength of shale ***,the benefits and drawbacks of using uniaxial and triaxial compression,ultrasonic testing,and nano-indentation techniques in unconventional reservoirs were *** findings suggest that,because of the possibility for experimental testing repeatability for increased accuracy,ultrasonic testing is the most appropriate experimental approach in the scenes of assessing static and dynamic geomechanical properties of reservoir shale *** suggested that numerically-based simulation of experimental techniques used for shale geomechanical evaluations and numer-ical modeling of heterogeneous shale rock samples will be necessary in light of the limitations faced in the a

关键词： Reservoir shale rock Geomechanical properties Mineral content

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Cartographic Study and Modeling of the Bakwanga Kimberlite Massive 5 at Kasai Oriental in the Democratic Republic of Congo

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Journal of Geoscience and Environment Protection 2024年第4期12卷 78-95页

作者： Arnold Onya Ngila Ivon Ndala Tshiwisa ruben koy kasongo Alain Cibumba Cibumba Chamira Fwani Pambu Dona Kampata Mbwelele Centre National de Té l&#233d&#233tection (CNT) Kinshasa Democratic Republic of Congo Geosciences Department Faculty of Sciences and Technologies University of Kinshasa Kinshasa Democratic Republic of Congo Geo-Hydro-Energy Research Group Geosciences Department Faculty of Sciences and Technologies University of Kinshasa Kinshasa Democratic Republic of Congo

Bakwanga kimberlite massive 5 in Kasai Oriental is part of a set of 13 kimberlite massives numbered according to the order in which they were discovered. They are located on an alignment with a more or less W-E direction making up the Northern group known as Bakwanga. The importance of the Bakwanga kimberlite massives on the country’s economy in the production of diamonds sufficiently proves the interest of geological research work in this area. The objective of this work is to determine a mathematical model of the shape of the massive as close as possible to reality and through cartography. The cartographic study and modeling of this kimberlite massive were carried out using data from core samples taken on longitudinal and transverse profiles of the 50 × 50 meter mesh drilling plan intersecting this kimberlite massive. We intend to deduce the structure and lithostratigraphy of the kim-berlitic facies and the direct environment of massive 5. As a result, we note that the majority of surveys on the extent of this massive have intersected: Red clayey sand - Polymorphic sandstone - Nodular sandstone, with kaolin blocks and nodules - Epiclastic Kimberlite - Xenokimberlite - Massive Kimberlite - Mesozoic sandstone - Dolomite (enclosing). The shape of the Massive 5 model is vaguely elliptical with a W-E longitudinal axis of 575 m and N-S axis of 275 meters. Surveys have shown that Massive 5 is in fact composed of two pipes, located in the W (western pipe) and E (eastern pipe) ends of the massif. The two chimneys of the two pipes have walls ranging from subvertical at the eastern pipe to very steep walls of around 70˚ to 80˚ for the western pipe and the average diameter of the two pipes is ±50 meters. At level 600, the massive has an area of ±10.5 hectares and it gradually decreases in depth and the modeling of the latter shows a concentric decrease in the volume of the massive from the surface to depth in the shape of a mushroom. 3 eruptive phases established this Kimber-

关键词： Massive Kimberlite Cartography Modelization Epiclastic Kimberlite Xenokimberlite Pipe

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Exploratory and Descriptive Study of the Kimberlite Massif of Boya-02 at Eastern Kasai in the Democratic Republic of Congo

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Journal of Geoscience and Environment Protection 2024年第1期12卷 130-144页

作者： Arnold Onya Ngila Ivon Ndala Tshiwisa ruben koy kasongo Serge Diemo Alain Cibumba Cibumba Chamira Fwani Pambu Dona Kampata Mbwelele Centre National de Télédétection (CNT) Kinshasa The Democratic Republic of Congo Department of Exploration Faculty of Oil and Gas University of Kinshasa Kinshasa The Democratic Republic of Congo Geo-Hydro-Energy Research Group Department of Geosciences Faculty of Sciences and Technologies University of Kinshasa Kinshasa The Democratic Republic of Congo

The Boya-02 kimberlite was identified at depth by geophysical survey work (a single-probe AM survey in 1997 and a gravity survey in 2006) that De Beers DRC Exploration carried out around anomaly 193/172/0019. This anomaly located approximately 50 km southwest of the town of Mbuji-Mayi in the Kasaï-Oriental Province in the DRC should therefore be the subject of detailed exploration with the aim of better identifying and describing this kimberlite. Thus, through exploratory work and cross-checking of geophysical and geological data, the discovery of this Massif was made by drilling on the aeromagnetic anomaly 193/172/X298. Based on drilling, sampling and laboratory petrographic analysis reports, the Boya-02 kimberlite was classified among highly diluted re-sedimented volcaniclastic kimberlites (KVR), rich in olivine and incidentally in quartz and poor in juvenile substances. This kimberlite represents a deposit of very low economic interest following extremely high dilution. The Boya-02 kimberlite was modeled using ground magnetism data. It is a complex anomaly comprising 2 components with variable amplitude appearing on a subtly magnetized linear detail. The modeled dimensions of two components of this anomaly are 0.32 Ha and 0.2 Ha at depths of 32 m & 14 m for the deposits to the West and the East respectively. Garnet data for the Boya-02 occurrence reports a maximum Pmin value of 49.7 kbar (207 garnets). These data demonstrate the high diamond potential which assumes a conductive cratonic geotherm of 40 mWm2.

关键词： Exploratoire Massif Kimberlitique Kasaï Oriental

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