The Geology of Fluvial Deposits: Sedimentary Facies, Basin by Andrew D. Miall

By Andrew D. Miall

The Geology of Fluvial Deposits represents the 1st released synthesis of study at the sedimentary geology of fluvial deposits. It units out intimately the tools for the sector and subsurface research of those sediments, and gives geologists with special descriptions of the construction blocks of fluvial stratigraphic devices, from lithofacies via architectural parts and depositional platforms to large-scale stratigraphic sequences and basin-fill complexes. The e-book includes a new type of oil and gasoline fields in fluvial reservoirs, with descriptions of chosen case examples. Profusely illustrated and with an in depth connection with the hot literature this textbook may be welcomed via the coed alike.

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Example text

8). In practice, compaction laws on the basis of Terzaghi’s effective stress definition are written in terms of porosity loss versus the vertical component of the effective stress σz . The usage of porosity change instead of the volumetric bulk strain neglects volume changes of the solid matrix which are small. The restriction to the vertical effective stress means that a fixed ratio between horizontal and vertical stresses is assumed. The corresponding vertical total stress can then be simply approximated by the overburden sediment load pressure pl .

Practical solutions can, on the other hand, only be obtained for discretized models. A mesher generates grids with the cells as the smallest volumetric units of the geological model. The basin or region of interest is assumed to be covered continuously with cells. Every physical or geological quantity such as temperature, pressure, saturation, concentration, permeability, thermal conductivity, etc. is well defined in the cell as a single, effective or average value. Furthermore, the value can vary continuously from cell to cell at least within parts of the structure.

Transport processes for water (pore pressure and compaction), heat (temperature calculation), and petroleum (migration and diffusion) can be formulated in terms of flow equations with appropriate conservation equations for mass or energy which finally yield diffusion type differential equations. A sedimentary basin is a sequence of geological layers. Each layer was deposited in a given stratigraphical event and is subdivided into regions of similar facies. A facies type specifies the lithological rock type and the organic facies.

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