The sequence stratigraphic methodology establishes the order in which bodies of sediments were laid down and their geometric relationship to each other. It guides the interpretation of the origins of sedimentary rocks enabling the mapping and interpretation of single and multiple cycles of sedimentary rocks. For precise sequence stratigraphic analysis it must has integrated interpretation of well logs data, Seismic and Biostratigraphy etc

Sunday, October 26, 2014

System Tracts and their deposition

System Tract

A system tract is  part of a sequence, identified on the basis of stratal stacking pattern, position in a sequence and in the sea level curve and type of its bounding surfaces..

Generally there are four system tracts in a sequence  i.e. 

High Stand System Tract (HST),

Falling Stage System Tract (FSST),

Lowstand Stand System Tract (LST),

Trangressive System Tract (TST),

This figure shows deposition of different system tracts with reference to sea level changes and hierarchy of straigraphic sequences.

Order of Sequences (Sequence Stratigraphy)

Cycle Order

Attenuation of cycles produces maximum sea level high and lowstands

Sequence Straigraphic orders

Sequence Straigraphic orders:

Duration of different orders of sequence is different according to different authors. (See Table Below)

Duration of sequence cycles according to different authors.

Tuesday, April 29, 2014

Wireline Logging Latest Techniques