Oolite

Classification：Sedimentary Rock

A rock composed of spherical or ellipsoidal particles consisting of core and surrounding core cladding. The main component of oolitic is calcium carbonate.

 

50% of the total content of rock is Oolite. According to the difference of the fillings, they are divided into the bright Oolite and the microcrystalline pupae grained limestone; according to the size of the particles, they are divided into the grained limestone and the Oolite, and the oolitic (concentric or radiate oolitic) limestone, the thin skin Oolitic Limestone and the complex Oolitic Limestone are different according to the oolitic types. [1] Oolitic Limestone (Oolitic Limestone), also known as Oolite, is a limestone which is mainly composed of oolitic particles. It is a good reservoir rock. It is a limestone with both chemical and mechanical causes, which is formed in the sea, Lake wave activity zone or tidal channel flow zone in the supersaturated state of calcium carbonate.

 

Classification:
According to the interstitial composition of oolitic particles, it can be divided into bright Oolitic Limestone and argillaceous Oolite. According to the structural characteristics of oolitic interior, it can be divided into normal Oolitic Limestone, thin Oolitic Limestone, pseudo Oolitic Limestone, Oolitic Limestone and complex Oolitic Limestone.
Form：
The main component of Oolite is calcium carbonate, and it also contains chert, phosphate, dolomite, hematite or iron ore, among which dolomite and chert Oolites are the main reasons for their unique texture. The oolitic hematite discovered near Bermingham near Hongshan and Alabama belongs to Oolite.
Oolitic rocks are often used for family aquarium production because of their smaller particle size (0.2 to 1.22mm).
The principle of formation:
The action of wave and tide causes the stirring of water medium, and every agitation is in the suspension state of biological debris, pellets, clastic, land source detritus and so on. At the same time, carbon dioxide escapes from the water body, and the supersaturated calcium carbonate (aragonite needle) precipitates a circle of shells around the debris particles, so that it is stirred in the same cycle. The formation of oolitic grains with a circle of concentric clad shells. When the oolitic grain reaches a certain size, its mass exceeds the wave and the energy stirred by the flow of water. It accumulates on the seabed and is no longer stirred, and is cemented for the bright crystal calcite to form a bright crystal Oolite. If the oolitic particles are taken to the low energy environment, the mud crystal Oolite is formed.
Significance：
Oolite is of great significance in the process of oil and gas exploration. Because of its high porosity and high permeability, Oolite is often a good gathering place for crude oil and natural gas, often forming large oil and gas reservoirs.