Separation of clay minerals

 

In order to identify the composition, content and chemical composition of clay minerals in rocks, it is necessary to separate clay minerals from rocks

1. Scattered

Clay dispersion is to disperse the clay in the rock sample in water and make it in a suspended state, that is, to prepare the clay suspension of the rock sample. The clay in the rock, including authigenic illite, is dispersed in water and suspended, that is, the clay suspension for the preparation of rock samples.
The method of dispersion can be physical dispersion or chemical dispersion。
Chemical dispersion is to add a variety of dispersants to the suspension which is not very good, so that the clay material is fully dispersed and suspended.
Physical dispersion is the separation of clay mineral particles by means of mechanical forces。

2. Separation

Sedimentation siphon separation and centrifugal separation are widely used at home and abroad
Sedimentation siphon separation method referred to as sedimentation method: in the medium is uniformly distributed dispersed particles due to gravity will sedimentation, when gravity and resistance to balance, dispersed particles for uniform sedimentation, then the particle settlement speed and particle radius square is proportional to the medium viscosity coefficient is inversely proportional.
Centrifuge is a method of separating clay using a centrifuge.

3. Introduction to the separation program

Clay separation includes sampling, sample selection, weighing, crushing, oil washing, distilled water immersion, wet grinding or refrigeration-heating cycle sample dissociation, preparation and extraction of clay suspension, centrifugal precipitation, drying, weighing and packaging, etc.
Refer to authigenic illite。

The characteristics of clay minerals under scanning electron microscopy are viscous

Structural characteristics of clay minerals

4. Introduction of chloroform asphalt A extraction

A method for improving the extraction efficiency of chloroform asphalt “A”

Technical field: The invention belongs to the field of oil and gas exploration, and relates to a method for improving the extraction efficiency of chloroform asphalt “A”.

Background Technology:

Chloroform asphalt A refers to the asphalt material extracted by chloroform before the rock sample is treated by acid, which is composed of saturated hydrocarbon, aromatic hydrocarbon, colloid and asphaltene. Usually chloroform bitumen A value is expressed by the ratio of the extracted bitumen mass to the rock mass. Chloroform asphalt A can accurately represent the content of chloroform soluble asphalt in rock samples. In the course of oil and gas exploration, source rock is the material basis of oil and gas formation. The evaluation of hydrocarbon generation potential of source rocks is one of the important contents of geochemical research and an important aspect of oil and gas exploration. In the evaluation of source rocks, the abundance, type and maturity of organic matter of source rocks are evaluated and graded according to certain evaluation criteria, and the hydrocarbon generation potential of source rocks is obtained. The oil generation and discharge threshold of source rocks is determined according to the changes of geochemical parameters of source rocks at different burial depths. Chloroform bitumen A is an essential parameter in the evaluation of source rocks. The hydrocarbon content of chloroform bitumen A is closer to petroleum in composition. Therefore, with the same organic matter, the higher the content of chloroform asphalt A, the higher the degree of conversion of organic matter to petroleum. The ratio of chloroform asphalt content A to organic carbon content is usually used to indicate the conversion degree of organic materials to oil and gas.

Accurate analysis data of chloroform bitumen A is the premise of hydrocarbon source rock evaluation, which is of great significance to explore the formation and evolution of petroleum.

 

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