What is facies in sedimentology?

Sedimentary facies are either descriptive or interpretative. Sedimentary facies are bodies of sediment that are recognizably distinct from adjacent sediments that resulted from different depositional environments. Generally, geologists distinguish facies by the aspect of the rock or sediment being studied.

What is facies analysis?

Facies analysis is the description and classifi- cation of any body of sediment followed by the interpretation of its processes and environments of deposition, usually in the form of a facies model (Table 1).

What is the difference between stratigraphy and sedimentology?

Sedimentology is the study of sediment, particularly focusing on how it is transported, and deposited. Stratigraphy emphasizes the analysis of sedimentary strata, the layers of sedimentary (and some volcanic) rocks that cover about 3/4 of the earth’s surface.

What is Walther’s law of succession of facies?

Walther’s Law states that any vertical progression of facies is the result of a succession of depositional environments that are laterally juxtaposed to each other.

What are facies used for?

Facies are used mostly to establish different units of rock from adjacent units within a contiguous body of rock by physical, chemical, or biological means.

What is the definition of a facies?

Medical Definition of facies 1 : an appearance and expression of the face characteristic of a particular condition especially when abnormal adenoid facies — see hippocratic facies, moon facies. 2 : an anatomical surface.

What is the purpose of sedimentology?

The aim of sedimentology, studying sediments, is to derive information on the depositional conditions which acted to deposit the rock unit, and the relation of the individual rock units in a basin into a coherent understanding of the evolution of the sedimentary sequences and basins, and thus, the Earth’s geological …

What are the application of sedimentology?

Most applications of sedimentology to ancient sedimentary rocks are concerned with the extraction of raw materials. They fall into two main groups: the extraction of certain strata of sediment, and the extraction of fluids from pores, leaving the strata intact.

What is the importance of Walther’s Law in sequence stratigraphy?

Walther’s Law. This allows us to convert a vertical straigraphic section into a reconstructed map of original depositional environments, very powerful concept. It’s important to understand where we can or cannot apply Walther’s Law, or else we may apply it incorrectly and arrive at an unsupportable intepretation.

What is shallowing upward sequence?

The shallowing-upward succession indicates that accommodation space was filled more rapidly than it was created. Flooding surfaces represent a relative rise in sea level, such that accommodation space is being created at a faster rate than it is being filled with sediment.

What is facies sequence?

A facies sequence is a series of facies that pass gradually from one into another. A sequence can have an abrupt or erosive boundary, or be bounded by a hiatus, as indicated by a rootlet bed, reworking, or early diagenesis. Clastic environments have two important types of sequences.

What is facies map?

Facies maps are made at an isochronous surface or within a coeval interval. We map reservoir system thickness (1) to compare the distribution of reservoir-system thickness and field location and (2) to identify or predict locations with thick reservoirs and trapping conditions that are undrilled.