The Upper Cretaceous facies of Enugu Area are part of the sequence in the Anambra Basin of Southeastern Nigeria. These include the Enugu Shale, Mamu Formation, Ajali Sandstone and Nsukka Formation. The deformation structures within the Upper Cretaceous in Enugu area were dominant to sandstones of the Marnu Formation. The white silty fine sandstone, muddy fine sandstone and heteroliths of this f...

Introduction: Cryptoendolithic communities colonizing sandstones in the Dry Valleys of Antarctica have been the subject of much research over recent years, owing to their potential as analogues of Martian life-forms. Interest in them stems from the similarities between the Antarctic cold desert ecosystems, representing some of the most extreme of terrestrial environmental habitats, and the cond...

An integrated study using 3D seismic, wireline logs, and core analyses was conducted to establish strategies for exploring in compartmentalized, lowstand, prograding, deltaic systems. Frio sediments, averaging ~11,000 ft, are commercial gas reservoirs in several of the growth-faulted, intraslope subbasins in South Texas. These exploitation targets are typically located in faultbounded compartme...

The area studied covers unmined Pennsylvanian Ćwiklice and Dankowice coal deposits located in the southern part of Upper Silesian Coal Basin, Poland. geological structure clearly affects current distribution methane. content methane is lower seams lying within porous permeable sandstones (Łaziska sandstones), whereas it higher that occur sequences (Mudstone Series) where impermeable shales muds...

In the geological record one tends to think of formations composed of either limestones or sandstones, but rarely both. In fact, there are many cases of interbedded clastics and carbonates in repeated cyclic arrangements. Such units occur on the small-scale (metre-thick cycles or parasequences, 4/5 order), and on the larger-scale (10’s metre-thick, 4 order high-frequency sequences and 100’s met...

Current understanding of porosity preservation in deeply buried sandstone reservoirs tends to be focused on how diagenetic grain coatings of clay minerals and microquartz can inhibit macroquartz cementation. However, the importance of overpressure developed during initial (shallow) burial in maintaining high primary porosity during subsequent burial has generally not been appreciated. Where por...

The trace fossil Gyrochorte is common in Upper Jurassic siliciclastic rocks of the Kachchh Basin, western India. In the Kimmeridgian Katrol Formation, Gyrochorte comosa Heer, 1865 is tied to storm-generated fine-grained sandstones and exhibits an internal structure composed of double arches in cross-section, confirming the three-dimensional nature of the trace fossil and its interpretation as p...

The “λ”term, or incompressibility, is sensitive to pore fluid, whereas the “μ” term, or rigidity, is sensitive to the rock matrix as described in the original paper by Goodway et al(1997) that gives the physical interpretation of the lambda λ and mu (μ) attributes. As per the theory, it is impossible to de-couple the effects of density from” λ” and “μ“when extracting this information from sei...