The formation resistivity factor evaluation of brine-filled reservoir rock is an essential part of electrical resistivity log interpretation in petroleum exploration. Empirical relations such as Archie’s law are widely employed to model the relationship between the formation resistivity factor and porosity. Historically, the Archie cementation exponent has been obtained from experimental labora...

17 A model for the formation and distribution of sedimentary rocks on Mars 18 is proposed. The rate–limiting step is supply of liquid water from seasonal 19 melting of snow or ice. The model is run for a O(10) mbar pure CO2 atmo20 sphere, dusty snow, and solar luminosity reduced by 23%. For these conditions 21 snow only melts near the equator, and only when obliquity &40◦, eccentricity 22 &0.12...

A large, shallow braided river delta sedimentary system developed in the Yanchang Formation during the Triassic in the southwest of the Ordos basin. In this braided delta system, abundant oil and gas resources have been observed, and the area is a hotspot for oil and gas resource exploration. Through extensive field work on outcrops and cores and analyses of geophysical data, it was determined ...

the siyah bisheh area is located in central part of alborz zone, 40km south of amol, iran. rock units exposing in the area consists of sedimentary (carbonates, sandstone, siltstone), volcano- sedimentary (andesite to andesitic tuff, tuff), ignimbrite and basalt. when erosion and tectonics have rendered volcanic structures undetectable, remote sensing provides an invaluable tool for their ide...

Rhythmically deposited argillites of the Gowganda Formation (ca. 2.0^2.5 Ga) probably formed in a glacial setting. Drop stones and layered sedimentary couplets in the rock presumably indicate formation in a lacustrine environment with repeating freeze^thaw cycles. It is plausible that temporal variations in the thickness of sedimentary layers are related to interannual climatic variability, e.g...

stylolite networks and their insoluble residues (ir) are among the major concerns and the fundamental controls on the mining and processing of sedimentary decorative stones, largely made from dolomitized limestones. they are mainly used, as natural rock blocks and polished slabs, to construct and decorate floors and walls of buildings and monuments. representative quarries in khur areas, east o...

The nature of ancient hydrological systems onMars has been the subject of ongoing controversy, driven largely by a disconnect between observational evidence for flowing water on the Martian surface at multiple scales and the incompatibility of such observations with theoretical models that predict a cold early Martian environment in which liquid water is unstable. Here we present geochemical da...

Elemental (C, N, Pb) and isotopic (dC, dN) measurements of cored sediment from a small bog in northern New Mexico reveal changes in climate during the Late Pleistocene and Holocene. Abrupt increases in Pb concentration and dC values ca. 14 420 cal. YBP indicate significant runoff to the shallow lake that existed at that time. Weathering and transport of local volcanic rocks resulted in the deli...