Petroleum Terms Explained - 4

Compound cycle
Fine sedimentation at the bottom of the middle coarse top. For example, the top of the mudstone is sandstone in the middle.
Sedimentary rhythm
The composition, structure, or color of rock formations are regularly repeated.
Sedimentary facies sedimentary facies
It refers to a specific rock combination formed in a particular depositional environment. For example, rivers and lakes are equal. Deposition unit leveling is relative. The division of the sedimentary facies should be based on the actual development of the oilfield. For example, the river is a big phase, braided river,
The meandering river and the meshed river are subphases, and the point dams, natural banks, and bursting fans of the meandering river are microfacies.
Sedimentary microfacies
Refers to the smallest unit in the sub-facies with unique rock structure, structure, thickness, rhythm and other profile features on the profile and a certain degree of plane configuration.
Development system series of development strata
It is a set of sand-shale and mudstone-bearing oil-gas-bearing layer combinations that can be contrasted in sedimentary basins.
Oil layer group
In the full section of the hydrocarbon-bearing strata, there is a clear segmentation of a well log curve. There are obvious changes in the lithology or lithology combination of these segments, and the oil level is significantly different. It can be classified as a reservoir group.
Sand group sands group
The development zones of adjacent oil and gas reservoirs in the oil and gas reservoir group are divided into sand layers, and some oil fields and sand layers are combined into one section.
Small layer
In the sand group, the oil and gas layers separated by the non-permeability layer are divided into a small layer.
Oil sand body
Also known as a single oil layer, a small layer may contain several monolayers, or it may be a single layer.
Standard floor
In the sedimentary section, signs with stable lithology, outstanding features, extensive distribution, and easy-to-identify well log curves, such as fossil beds, oil shales, etc.
Auxiliary standard layer
Refers to the characteristics of the standard layer or some features, standard layout of the distribution of the limit.
Logo layer key bed
The lithology combination is obvious and the logging curve can be identified in the interval. It can be used as a marker layer.
Stratum loss
In the course of stratigraphic comparison, the relative stratigraphic standard profile lacks certain strata. It can be formed by erosion of the strata, lack of strata, or strangling of strata.
Stratum pinch out
The thickness of the rock thinns at the edges of the sedimentary basin and disappears.
Strata overlap strata overlap
When the coverage of seawater or lake water gradually expands, new sediments are deposited in new submerged highlands called oversubscription or formation unconformity.
Structural geology
The study of the earth structure determined by the movement of the earth's crust is the science of the shape, size, and interrelation of the rock mass.
Formation formation
The position of the rock formation in three-dimensional space.
Formation strike
The direction of the intersection of the rock layer and the horizontal plane.