What is a structural trap in geology?
Structural trap is a type of geological trap that forms as a result of changes in the structure of the subsurface, due to tectonic, diapiric, gravitational and compactional processes. These changes block the upward migration of hydrocarbons and can lead to the formation of a petroleum reservoir.
What are fault traps?
A fault trap is a geological formation in which oil or gas in a porous section of rock is sealed off by a displaced, nonporous layer. A fault trap occurs when formations on either side of the fault move and lie in such a way that, when petroleum migrates into one of the formations, it becomes trapped there.
What is an unconformity trap?
An unconformity trap is a hydrocarbon trap where the closure is made by an unconformity (= a formation of rock layers which represents a gap in the geological record). An unconformity trap can form if part of a porous layer of rock is eroded and then covered with an impermeable caprock.
What are combination traps?
[‚käm·bə′nā·shən ¦trap] (geology) Underground reservoir structure closure, deformation, or fault where reservoir rock covers only part of the structure.
What is anticlines and fault traps?
An anticline is a structural trap created through the folding of rock strata into an arch-like shape. The rock deposits in an anticlinal trap were formerly located down horizontally and then Earth movement created it to fold into an arch-like shape termed as an anticline.
What are the two types of hydrocarbon traps?
There are two major categories of traps, and are classified based on how the petroleum accumulates. The two main groups are structural traps and stratigraphic traps.
Is a reef a trap?
Reefs become large petroleum traps when their vertical dimension has been extended by upward growth with a rising sea level, relatively. It seems necessary for them to have grown on a permeable platform that acted as a carrier bed, because the reef organisms themselves were not the source of the petroleum.
What is Reeftrap?
reef trap Stratigraphic oil or gas trap produced by porous reef limestones (reservoir rock) covered by impermeable strata. Porosity of limestones depends on post-depositional diagenetic changes. A reef trap may also host lead and zinc mineralization in material deposited from migrating brines.
What is the difference between structural and stratigraphic traps?
Answer: A Structural trap is formed by tectonic processes AFTER deposition of the reservoir beds involved while a Stratigraphic trap is created during deposition of the reservoir beds.
Why are anticlines good oil traps?
Anticlines form a structural trap that can capture pockets of hydrocarbons in the bend of the arch. Impermeable rock beds, often referred to as seals or cap rock, trap hydrocarbons in the anticline peak. This causes oil and natural gas to build up in the pore spaces of the reservoir rock at the core of the arch.