A pinch-out or wedge-out[1] is a point where a stratum or other lithologically distinct body of rock thins to a feather edge and disappears, so that the underlying and overlying strata separated by the pinching out stratum come into direct contact. The term also is used in petroleum geology to describe a stratigraphic trap created by a pinch-out. Petroleum migrating through a porous stratum is trapped where the stratum pinches out between impermeable underlying and overlying strata.[2][3]
Diagram illustrating a pinch-out petroleum trap
As of 2019[update], at least 20 oil fields containing reserves of 6-7 billion barrels of petroleum are thought to be a result of pinch-out of turbidite beds.[4]
A pinch-out is distinct from a shale-out, which is a structural trap formed when a porous bed grades laterally into impermeable shale without the bed actually pinching out.[5]
Referencesedit
^Jackson, Julia A., ed. (1997). "wedge-out". Glossary of geology (Fourth ed.). Alexandria, Virginia: American Geological Institute. ISBN0922152349.
^Nelson, S.A. (19 October 2015). "Energy Resources". Tulane University. Retrieved 3 November 2021.
^Amy, Lawrence A. (December 2019). "A review of producing fields inferred to have upslope stratigraphically trapped turbidite reservoirs: Trapping styles (pure and combined), pinch-out formation, and depositional setting". AAPG Bulletin. 103 (12): 2861–2889. doi:10.1306/02251917408. hdl:10197/11533.
pinch, pinch, wedge, point, where, stratum, other, lithologically, distinct, body, rock, thins, feather, edge, disappears, that, underlying, overlying, strata, separated, pinching, stratum, come, into, direct, contact, term, also, used, petroleum, geology, des. A pinch out or wedge out 1 is a point where a stratum or other lithologically distinct body of rock thins to a feather edge and disappears so that the underlying and overlying strata separated by the pinching out stratum come into direct contact The term also is used in petroleum geology to describe a stratigraphic trap created by a pinch out Petroleum migrating through a porous stratum is trapped where the stratum pinches out between impermeable underlying and overlying strata 2 3 Diagram illustrating a pinch out petroleum trapAs of 2019 update at least 20 oil fields containing reserves of 6 7 billion barrels of petroleum are thought to be a result of pinch out of turbidite beds 4 A pinch out is distinct from a shale out which is a structural trap formed when a porous bed grades laterally into impermeable shale without the bed actually pinching out 5 References edit Jackson Julia A ed 1997 wedge out Glossary of geology Fourth ed Alexandria Virginia American Geological Institute ISBN 0922152349 Jackson 1997 pinch out Nelson S A 19 October 2015 Energy Resources Tulane University Retrieved 3 November 2021 Amy Lawrence A December 2019 A review of producing fields inferred to have upslope stratigraphically trapped turbidite reservoirs Trapping styles pure and combined pinch out formation and depositional setting AAPG Bulletin 103 12 2861 2889 doi 10 1306 02251917408 hdl 10197 11533 Jackson 1997 shale out nbsp This article about structural geology is a stub You can help Wikipedia by expanding it vte Retrieved from https en wikipedia org w index php title Pinch out amp oldid 1166637725, wikipedia, wiki, book, books, library,
