Natural gas trapped in hydrate deposits is a potentially enormous source of energy which can principle be extracted from the underground reservoir structures. These reserves also catastrophically release very large quantities greenhouse gases to atmosphere. One key parameter well known strongly influence fluid distribution, saturation, and production rock wettability. However, effect wettabilit...

2 DISCLAIMER This report was prepared as an account of work sponsored by an agency of the United States Government. Neither the United States Government nor any agency thereof, nor any of their employees, makes any warranty, express or implied, or assumes any legal liability or responsibility for the accuracy, completeness, or usefulness of any information, apparatus, product, or process disclo...

Geologic uncertainty in underground construction often leads to design and construction conservatism and hence to inflated costs. This paper presents a general model for the probabilistic prediction of tunnel geology, as a basis for developing more effective tunnel design and construction decision support systems. The geologic conditions along the tunnel alignment are modeled by a set of geolog...

Terrace profiles along rivers based on accurate correlations of terraces and geochronological examination are needed to reveal regional crustal deformation from the distribution river terrace surfaces. Tephra beds, which intercalated or cover sediments, used as beneficial information correlate surfaces accurately. On other hand, in cases lacking tephric correlation is mainly geomorphic characte...

Forward modeling of reflection seismic data is a computational process through which a geologic model (units: horizontal distance, vertical depth; layer acoustic impedance) of the subsurface is transformed into a synthetic reflection seismic record (units: horizontal distance, 2-way travel time; reflection amplitude). Synthetic seismic records (synthetics) are often generated both before and af...

OBJECTIVE Exposure to radon is associated with approximately 10% of U.S. lung cancer cases. Geologic rock units have varying concentrations of uranium, producing fluctuating amounts of radon. This exploratory study examined the spatial and statistical associations between radon values and geological formations to illustrate potential population-level lung cancer risk from radon exposure. METH...

Geologic maps are complex scientific documents that provide considerably more than cartographic representations of geologic information. Modeling these documents in sufficient detail that they can be recorded and manipulated in computer database form, not simply as raster graphics, is essential to continued progress in geologic science. This paper discusses the principal challenges in geologic ...

Ice and other mineral cements in Mars' shallow subsurface affect the mechanical properties of crust, geologic processes that shape planet's surface, search for past or extant Martian life. Cements increase seismic velocities. We use rock physics models to infer cement from Model results confirm upper 300 m Mars beneath InSight is most likely composed sediments fractured basalts. Grains within s...