Tag Archives: Geological Description

=Clay Stone & Shale (Clst&Sh).

Clay Stone & Shale are formed from accumulation of clay minerals and silt particles. Its grain size is less than 4 microns.

= Marl (Mrl).

Marl is formed from accumulation of clay minerals and calcium carbonate (calcite) and its grain size is less than 4 microns.

= Sandstone (Sst)

Sandstone is formed of accumulation of mineral grains (quartz) and its grain size is from 60 microns to 2 mm.

= Siltstone (SLst)

Siltstone is formed of accumulation of mineral grains (quartz) and its grain size is from 4 to 60 microns.

= Conglomerate (Cgl), its grain size is greater than 2 mm.

Conglomerate is formed from accumulation of primarily granule, pebble and boulder size particle.

= Geological fault

It is very important to understand what geological description used in oil filed business. Hence, I collect the geological description from the book in order to be your reference and you will be able to understand meaning of each photo describing type of rock.

= Limestone (Ls)

= Dolomite&Chalk (Dol & Chk)

= Chert (Cht)

Limestones, Dolomite and Chalk are formed from large deposit of calcium carbonate (calcite) and calcium magnesium (dolomite).

= Gypsum & Anhydrite (Gyp & Anhy)

= Salt (Sa)

Gypsum, Anhydrite and Salt are composed of minerals precipitated from solution during evaporation of water.

= Basement (Bm)

= Volcanics (Volc)

Basement and Volcanics are formed from the cooling of molten magma.