[en] Abstract only

[en] Laboratory researches with using of alloys of energy accumulating substances are carried out with the purpose of petroleum output increase on Kumkol deposit. Factor of petroleum replacement within range from 79.5 to 82.0 % is received by use silico-barium, silico-calcium and ferro-silicium with alkali and aluminium. (author)

[en] Severe sloughing zones encountered while drilling large diameter emplacement holes in Yucca Flat, Nevada Test Site, have been identified, correlated and predicted through detailed geologic investigations. In central and southeastern Area 7 and in northern Area 3, the unstable zones are a very fine-grained, well-sorted, unconsolidated sand deposit, probably eolian in origin, which will readily flow into large diameter drill holes. Other areas exhibit hole erosion related to poor induration or extensive zeolitization of the Tertiary tuff units which are very friable and porous. By examining drill hole samples, geophysical logs, caliper logs and drilling histories, these problem zones can be characterized, correlated and then projected into nearby sites. Maps have been generated to show the depth, thickness and areal extent of these strata. In some cases, they are local and have a lenticular geometry, while in others they are quite extensive. The ability to predict such features can enhance the quality of the hole construction and completion operations to avoid costly delays and the loss of valuable testing real estate. The control of hole enlargements will also eliminate related containment concerns, such as stemming uncertainties

No abstract available

No abstract available

[en] This paper introduces some examples of bleached zone in interlayer oxidation zone at sandstone-type uranium deposits at home and abroad, and analyses the genesis of bleached zone both macroscopically and microscopically. Authors suggest that the bleached zone is originated from the reduction of oxidized sand bodies by reducing gas of oil-gas ascending from the deep after the formation of interlayer oxidation zone, that main uranium orebodies are located between bleached zone and zone of primary unaltered rocks. As the bleached zone is the result of secondary reduction of oxidized sandstone, it might be wrongly regarded as unaltered primary grey sandstone thus leading to the missing out of uranium orebodies. From the above discussion, a deduction could be made, that uranium orebodies may occur in V-depositional cycle further ahead to the north of explored area, at the area of exploration line No.253, the western area of Wukurqi deposit, and the area between exploration lines No.389-421, the middle of Wukurqi deposit

[en] With the purpose of petroleum strata output increase, the maintenance of uniform stratum interlayer producing and the increase of replacement compass a way of superseding agents forcing processes regulation in a layer with various penetrability is offered. (author)

[en] Short communication

[en] New stratigraphic names and correlations are given for parts of the Early Proterozoic Pine Creek Geosyncline metasedimentary sequence and overlying felsic volcanics of the Darwin-Katherine region. They have significant implications for the stratigraphic distribution of uranium mineralisation in the Rum Jungle, Alligator Rivers and South Alligator Valley uranium fields

[en] The purpose of this paper is to present the results of preliminary assessment on the orbitolinids discovered for the first time from an isolated hillock (locally known as Peinyoin Hill) situated at just northwest of Lebyin village (lying on the Thazi-Shwenyaung Rail Road), and from the limestone lenses embedded within a sequence of tuffaceous sandstone, mudstone and conglomerates that is exposed on the west of the Myit-thar Stream. The present preliminary examination reveals that the orbitolinid fauna at the limestone hillock consists of Paracoskinolina cf. sunnilandensis Iraqia sp., and Simplorbitolina spp., indicating an early Cretaceous age (probably Aptian-Albian). On the other hand, the limestone lenses exposed on the west of the Myit-thar Stream bear Iraqia thailandensis (=Haurania thailandensis Kemper]. From this faunal evidence and prevailing lithostratigraphic characteristics, it has reached to the final conclusion that these controversial outcrops are no longer needed to be lumped in the Late Paleozoic Lebyin Group in the Plateau Limestone Group, but must be designated as a southern continuation of the Pan Laung Formation of Jurassic-Cretaceous age. (author)