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Comments About the Relationships Between New Ideas and Geologic Terms in Stratigraphy and Sequence Stratigraphy with Suggested Modifications
Vaterite (an uncommon polymorph of CaCO 3 ); occurrences in boreholes demonstrate unexpected longevity
Barrier island evolution in response to sea level rise; discussion and reply
Comment and Reply on ‘Time-temperature-burial significance of Devonian anthracite implies former great (−6.5 km) depth of burial of Catskill Mountains, New York’: REPLY
Holocene transgression in South-central Long Island, New York; reply
Time-temperature-burial significance of Devonian anthracite implies former great (∼6.5 km) depth of burial of Catskill Mountains, New York
Petroleum in Unconformity Traps: From Kerogen in Truncated Permeable Wedges?
Abstract The "wedge belts of permeability" that A. I. Levorsen emphasized as being prime targets for petroleum exploration have not become the objects of systematic exploration efforts, possibly because many geologists do not readily understand how petroleum can be found in an angular-unconformity trap that was subaerially eroded. The thesis of this paper is that modern geochemical research about kerogen, mostly isolated from supposed "source-rock" shales, can be applied equally to the kerogen found within permeable formations. If this concept is true, then many of the geologic enigmas associated with angular-unconformity traps can be explained. Immature kerogens within sands possibly can be subaerially exposed and/or flushed through with groundwater without being significantly altered. Because it does not migrate, solid kerogen within the permeable potential reservoir formation would not be lost updip when the future reservoir-to-be was exposed at the land surface. Moreover, any immature kerogen in the pre-unconformity permeable strata that survived weathering would be available for delayed conversion to petroleum at depth after geothermal heating either during the cycle of subsidence when the covering strata were deposited or later. In the origin of such petroleum, the only migration required is updip within the permeable formation to the sealed unconformity trap—Levorsen's wedge edge.