What is chemical stratigraphy?

What is chemical stratigraphy?

Chemical stratigraphy, or chemostratigraphy, is the technique of sediment characterisation and correlation using subtle variations in the elemental composition of the sediments. As such, it is probably the most versatile stratigraphic tool available to the industry at this moment.

What is Allostratigraphy?

Allostratigraphy is a stratigraphical method that subdivides geological sequences based upon a hierarchical framework of bounding surfaces or discontinuities that serve to compartmentalize discrete packages of sediment or rock (NACSN, 1983).

What is seismic stratigraphy in geology?

Seismic stratigraphy, the science of interpreting or modeling stratigraphy, sedimentary facies, and geologic history from seismic reflection data, has been practiced for at least three decades. Seismic stratigraphy has initiated a revolution in stratigraphic analysis as profound as that caused by plate tectonics.

What stratigraphy involves?

stratigraphy, scientific discipline concerned with the description of rock successions and their interpretation in terms of a general time scale. It provides a basis for historical geology, and its principles and methods have found application in such fields as petroleum geology and archaeology.

What is the basic unit of lithostratigraphy?

The fundamental Lithostratigraphic unit is the formation. A formation is a lithologically distinctive stratigraphic unit that is large enough to be mappable and traceable. Formations may be subdivided into members and beds and aggregated with other formations into groups and supergroups.

What is the difference between lithostratigraphy and Allostratigraphy?

Lithostratigraphy maps these sedimentary rocks solely on the basis of their lithology and does not necessarily consider that these rocks may have accumulated over a particular period of time. In contrast allostratigraphy maps the rock units on the basis of the timing of their accumulation.

Why is seismic stratigraphy important?

Seismic stratigraphy techniques help us for stratigraphic interpretation of seismic reflectors. It is important because geological concepts of stratigraphy can be applied on seismic data and hence, seismic stratigraphy can be used as a predictive tool for petroleum system elements like reservoir, seal and source rock.

What is the seismic interpretation?

Seismic Interpretation is the extraction of subsurface geologic information from seismic data. Reflection seismic data comprise: Continuity of reflections indicating geologic structure. Variability of reflections indicating stratigraphy, fluids and reservoir fabric.

What is stratigraphy and strata?

Stratigraphy is a branch of geology concerned with the study of rock layers (strata) and layering (stratification). It is primarily used in the study of sedimentary and layered volcanic rocks.

What is the purpose of stratigraphy?

Stratigraphy is they classification of different layers or layering of sedimentary deposits, and in sedimentary or layered volcanic rocks. This field is important to understanding the geological history and forms the basis for classification of rocks into distinct units that can be easily mapped.

What is lithostratigraphic correlation?

Lithostratigraphic correlation establishes a similar age of strata based on lithology, which is the composition and physical properties of that strata. Lithos is Greek for stone and -logy comes from the Greek word for doctrine or science.

How does lithostratigraphy work?

Lithostratigraphy is the ‘classification of bodies of rock based on the observable lithological properties of the strata and their relative stratigraphic positions’1. Stratigraphy includes information about processes, geographical distributions, and the palaeo-environment of past glaciers and glaciation.

What is chemostratigraphy in geology?

Chemostratigraphy involves the examination of stratigraphic variations of elemental and isotopic geochemistry for the characterization of sedimentary sequences (Das, 1997). Chemostratigraphy is concerned with the characterization and correlation of strata based on geochemical composition of the sediments, rocks, and rock components of interest.

Can chemostratigraphy be used as a correlation tool in shale exploration?

When shale exploration first started, chemostratigraphy was routinely used as a correlation tool within a multi-disciplinary approach to stratigraphy. However, once such drilling entered the production stage, the requirement for quantitative data relating to 50 elements diminished.

What is chechemostratigraphy used for?

Chemostratigraphy is especially useful when used in conjunction with other stratigraphic techniques.

What is wellsite chemostratigraphy?

The concept of wellsite chemostratigraphy (not to be confused with wellsite XRF) was developed at Chemostrat back in the late 1990s and is now widely applied as a backup option to other wellsite techniques and as a drilling control tool in its own right.