Plate Margins in Oil and Gas Industry

After learning about the Earth’s structure and Plate Tectonics, it is known that the Earth’s plates move relative to nearby plates; therefore this will result in high geological activities such as volcanic eruptions and earthquakes at the plate margins. It is also possible to have geological activities in the middle of plates, but it is quite uncommon. There are three type of plate margins; convergent, divergent and transform.

Divergent Margins

This happens when the Earth’s plates are moving apart and a new lithosphere is created (Figure 1).  In the oceans, the divergent process has produced the mid-ocean ridge system, which can also be described as a global range of underwater mountains. There are several ocean ridges such as the Juan de Fuca Ridge, the Mid-Atlantic Ridge, the Galapagos Rise and the East Pacific Rise. On land, the divergent margins create rift valleys such as the Red Sea and East African Rifts (Figure 2).

Figure 1 – Divergent Margins

(Ref Image:

Figure 2 – East Africa Rift

(Ref Image:

Convergent Margins

The convergent margins happen when two plates are pushed together. The heavier plate will go below the lighter plate; therefore, a subduction zone is created. Heavier oceanic crush normally resonates below the lighter, thicker continental crust. Geological features associated with subduction are trench formation, earthquake, mountain building and volcanism. Images in Figure 3, Figure 4 and Figure 5 demonstrate convergent margins.

Figure 3 – Ocean – Continental Convergence

(Ref Image:

Figure 4 – Continental-continental convergence

(Ref Image:

Figure 5 – Ocean-ocean convergence

(Ref Image:

Transform Faults

Transform faults, also known as conservative plate boundary, happen when two Earth plates slide past one another. The movement is usually irregular and non-uniform, but it happens rapidly as a series of slip faults and the transform faults will not create or destroy a lithosphere. However, sudden movement of slip faults produce earthquakes along the faults. Figure 6 shows an illustration of transform faults.

Figure 6 – Transform Faults

(Ref Image:


Richard C. Selley, 2014. Elements of Petroleum Geology, Third Edition. 3 Edition. Academic Press.

Norman J. Hyne, 2012. Nontechnical Guide to Petroleum Geology, Exploration, Drilling & Production, 3rd Ed.. 3 Edition. PennWell Corp.

Richard C. Selley, 1997. Elements of Petroleum Geology, Second Edition. 2 Edition. Academic Press.

Related Post

Organic Matter to Form Source Rock Oil and gas that we are drilling today comes from a biogenic origin and it is formed with proper time and temperature. Organic matter is one of the mo...
Clastic Sedimentary Rocks Clastic deposition covers about 75% of the Earth’s surface and clastic sedimentary rocks can be categorized into 3 groups based on grain size. Table 1...
Basic Understanding about 3D Seismic for Petroleum... 3D seismic is one of the most important techniques to help geologists and engineers to find out where possible hydrocarbon is below thousands of feet ...
Hydrocarbon Migration Hydrocarbon migration is a process that petroleum migrates from source rocks into reservoir. In petroleum geology, hydrocarbon migration is divided in...
Share the joy
  • 512
Tagged , . Bookmark the permalink.

About DrillingFormulas.Com

Working in the oil field and loving to share knowledge.

Leave a Reply

Your email address will not be published. Required fields are marked *

This site uses Akismet to reduce spam. Learn how your comment data is processed.