In a similar fashion, the Ordovician rocks are thought to have formed by weathering of more feldspar-rich sedimentary rocks at the margins of the Lachlan Fold Belt. Two episodes of chemical weathering are therefore recognised. The first produced the feldspar-poor Ordovician rocks; the second acted...
Considering the development of organic-rich carbonate rocks, black shale and coal seams in the Permian in southern Sichuan Basin, it is considered that there is a possibility of paleo-oil reservoirs in the region. Keywords: sedimentary environment / carbonate slope / gas exploration / Permian /...
Geochemistry of precambrian sedimentary rocks used to solve stratigraphical problems: an example from the Neoproterozoic Volta basin, Ghana. Precambrian Res. 176, 65-76. Kalsbeck, Feiko and Frei, Ribert (2010) Geochemistry of Precambrian sedimentary rocks used to solve stratigraphical problems: ...
In order to help unraveling the thermal history of Late Paleozoic sedimentary rocks in West Virginia, a rock magnetic study was conducted with a focus on the Marcellus Shales which are of interest for petroleum exploitation. Vitrinite reflectance, fluid inclusions microthermometry data and conodont alt...
A complex sequence of chemical reactions is involved in converting the original solid organic matter to oil and gas, and additional chemical changes may occur in the oil and gas even after they have formed. It is now well established that petroleum migrates through aquifers and can become trappe...
The pedogenesis pattern is a mixed type of residual parent material and aeolian dust deposition. (3) The whole profile is in a weak chemical stage and a weak soil development degree, coinciding with the low chemical weathering degree and weak soil development under the background of cold and ...
In the chemical weathering of rocks to soil the sequence of energy effects begins first with the disruption of relatively strong crystal bonds between ions, thereby making the ions vulnerable to pick up by plants by way of the exchange bonding energy of rootlets. As weathering advances, however,...
Nelms DL, Harlow GE, Plummer LN, Busenberg E (2003) Aquifer susceptibility in Virginia: data on chemical and isotopic composition, recharge temperature, and apparent age of water from wells and springs, 1998–2000. US Geol Surv Open-File Rep 03-246, 101 pp Google Scholar Nowak DJ, Green...
Various types of fracture systems have been formed in the Mawu 5 member of the Majiagou Formation under the weathering, denudation and chemical dissolution of surface water or groundwater. These fractures provide a foundation for the migration and storage of natural gas. Based on the existing dat...
of different facies among the three rock-types. Transitional facies show a patchy composition forming a different, sparsely distributed, mineralogical assemblage with a different chemical composition. The absence of plagioclase, paucity of amphibole and feldspar and the presence of calcite pseudomorphs ...