Thirty-seven mudstone samples were collected from the uppermost Lower Mudstone Member of the Potrerillos Formation in El Gordo minibasin within La Popa Basin, Mexico. The unit is exposed in a circular pattern at the earth's surface and is intersected by El Gordo diapir in the northeast part of the minibasin. Vitrinite reflectance (Ro) results show that samples along the eastern side of the minibasin (i.e., south of the diapir) are mostly thermally immature to low maturity (Ro ranges from 0.53% to 0.64%). Vitrinite values along the southern, western, and northwestern part of the minibasin range between 0.67% and 0.85%. Values of Ro immediately northwest of the diapir are the highest, reaching a maximum of 1.44%. The results are consistent with two different possibilities: (1) that the diapir plunges to the northwest, or (2) that a focused high-temperature heat flow existed along just the northwest margin of the diapir. If the plunging diapir interpretation is correct, then the thermally immature area south of the diapir was in a subsalt position, and the high-maturity area northwest of the diapir was in a suprasalt position prior to Tertiary uplift and erosion. If a presumed salt source at depth to the northwest of El Gordo also fed El Papalote diapir, which is located just to the north of El Gordo diapir, then the tabular halokinetic sequences that are found only along the east side of El Papalote may be subsalt features. However, if the diapir is subvertical and the high-maturity values northwest of the diapir are caused by prolonged, high-temperature fluid flow along just the northwestern margin of the diapir, then both of these scenarios are in disagreement with previously published numerical models. This disagreement arises because the models predict that thermal anomalies will extend outward from a diapir a distance roughly 1.5 times the radius of the diapir, but the results reported here show that the anomalous values on one side of the diapir are about two times the radius, whereas they are as much as five times the radius on the other side of the diapir. The results indicate that strata adjacent to salt margins may experience significantly different heat histories adjacent to different margins of diapirs that result in strikingly different diagenetic histories, even at the same depth.
Latin America is known for its young population, and the Latin America Region of AAPG is no exception.
The story of geology and exploration in Venezuela has been written by dozens of geologists who made a difference in that country. By extension and through mentorship and writing, their impacts continue today.
Shale may be the reservoir du jour, but a wide range of conventional reservoirs still hold promise in diverse regions throughout the world.
Discoveries were comparatively sparse, but they persisted steadily throughout the year. Here are some of the more significant discoveries of the past year.
A review of major oil and gas discoveries of 2013 shows a down year in terms of quantity—but that’s not the whole story.
Quartet made its debut in the industry this year. The reviews are in and it looks like the value brought to the field is proving it to be innovative and time-saving.
This year AAPG’s International Conference and Exhibition returned to Latin America, but set for the first time in Colombia – and a perfect phrase to describe the Cartagena meeting is that it featured a “massive and passionate participation of young people.”
Is that a UFO? Actually it is a UAV (unmanned aerial vehicle), which is an airborne drone that is proving to be useful both onshore and offshore.
Take a few minutes to review the experience of some 2,000 attendees at the recent International Conference and Exhibition held in Cartagena, Colombia.
Memoir 97– Far from being isotropic and homogenous, as once naively envisioned, shale reservoirs are complexly layered accumulations of fine-grained sediment. Geologic variation on scales ranging from that of stratal architecture to that of lamination within individual beds must be understood in order to locate and exploit areas of high production within shale reservoirs. Shale reservoirs remain largely geologic plays – not merely lease plays or strictly engineering plays made possible by improvements in drilling and completion technology. Release date: 08/2012
Memoir 98 – This memoir comprises works on biostratigraphy, ichnology, stratigraphy, depositional facies, diagenesis, and petroleum and mineral resources of the Great American Carbonate Bank. Release date: 01/2013
Memoir 94 – Thrust fault-related folds form numerous important hydrocarbon traps in sub-aerial and deep-water fold and thrust belts as well as in inversion fold and thrust belts. This memoir presents 16 papers on new advances in the analysis and understanding of thrust-related fold systems including detachment folds, thrust-fault propagation folds, wedge thrust-related fold systems, and basement-involved fold systems. Release date: 10/2011
This volume will prove useful to anyone interested in the methods for observing and quantifying the pore systems that control hydrocarbon storage and flow in unconventional reservoirs.
This volume includes contributions dealing with the origin of the magnetic minerals, and the application of MS as a palaeoenvironmental or palaeoclimatic proxy and also as a tool to provide astronomical calibration in order to improve the chronology of selected time intervals.
Continental margins and their fossilized analogues are important repositories of natural resources. With increased availability of high quality geological, seismic and potential field data, imaging of these margins and their embedded sedimentary basins and magnetic rocks has reached new levels of refinement and definition, as illustrated by the examples described in this volume.
Comprised of 48 chapters, this Memoir covers the biostratigraphy, ichnology, stratigraphy, depositional facies, diagenesis, and petroleum and mineral resources of the GACB. Product #787. Price: Member $184/List $304.
This volume will prove useful to anyone interested in the methods for observing and quantifying the pore systems that control hydrocarbon storage and flow in unconventional reservoirs. (Product #1281. Member price $144 / List price $339.)
This volume expands and improves the AAPG 1978 classic, A Color Illustrated Guide to Carbonate Rock Constituents, Textures, Cements, and Porosities (AAPG Memoir 27). Product #649.
SALE Price $24 (Regularly priced: Member $48 / List $68)
This volume is an ultimate resource for reading the story and history of fractures in rocks from core. It is a “must-have” volume for all who have, or wish to have, an intimate knowledge of the rocks they work with from a fracture point of view. (Product #1300. Member price $150 / List price $150.)
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