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Sedimentology and Stratigraphy

Explorer Historical Highlights

There is something about colored pencils that we, as geologists, find impossible to resist. From geological maps to field sketches to interpreting seismic on those never-ending rolls of paper taped to the longest corridor wall we can find – what more could any geologist want? Our need for powerful software, paper and colored pencils reflects a fundamental problem in geology and especially exploration: how to manage, analyze and visualize the diversity and wealth of information required to solve exploration problems? Early geologists were faced with the same challenge 200 years ago. It was one of the first petroleum geologists, Thomas Sterry Hunt, who saw the value of paleogeography in exploration, and who, in 1873, first coined the term “paleogeography.”

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American Association of Petroleum Geologists (AAPG)
Explorer Article

Touchstone Exploration is the operator of the 184-square kilometer Ortoire Block onshore south eastern Trinidad. The block spans from the villages of Tableland in the west to Pierreville Mayaro in the east and to the very remote areas within the Guayaguayare forest to the south. Structurally, the block covers the greater part of the open east facing Ortoire Syncline which entails Late Miocene Lower Cruse to Pleistocene Mayaro Formation deltaic fill. These passive fordeep infill deposits sit conformably onto a southeastern-verging Early to Middle Miocene fold belt. As such throughout the breadth of the Ortoire Block there are numerous tear fault dissected west-southwest to east-northeast trending anticlines.

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American Association of Petroleum Geologists (AAPG)
Explorer Article

'Sourced in part by the Eagle Ford Group, the Austin Chalk has been a hot spot for operators on and off for a century. The rise of horizontal drilling and hydraulic fracturing brought a renewed interest in the formation, which has produced new discoveries in Texas and Louisiana. Yet in parts of the Austin Chalk, extracting oil and gas can be extremely tricky. Several years ago, the Carbonate Reservoir Characterization Research Laboratory at the University of Texas began a project to analyze approximately 40 cores from the Austin Chalk – the first group to do so. '

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American Association of Petroleum Geologists (AAPG)
Explorer Geophysical Corner

Exploration of the Brookian-age Nanushuk and Torok formations on the North Slope of Alaska is a hot topic these days. The Nanushuk and Torok formations are Cretaceous progradational clastic deposits in the Colville basin of Alaska. These formations offer new opportunities to the oil and gas community because of their shallow depth, vast spatial extent, publicly available data, scope of development and other appealing features.

American Association of Petroleum Geologists (AAPG)
Explorer Article

Josh Rosenfeld highlighted some perspectives on the Paleogene drawdown hypothesis in the Gulf of Mexico in the April 2020 issue of the EXPLORER, a result of suspected isolation from the world ocean during the Cuban arc-Bahamas collision with implications for Wilcox reservoir deposition. In contrast, John Snedden and authors’ portrayed the Wilcox as a period of normal marine deposition, requiring no such drawdown, in the May 2020 issue. Still another concept was presented by Roger Higgs at the South African 2009 AAPG International Conference and Exhibition, that marine isolation occurred but that fluvial input exceeded evaporation such that the Gulf became brackish, hence the poor development of Wilcox fauna.

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American Association of Petroleum Geologists (AAPG)
Explorer Emphasis Article

Geologists will soon have a set of software tools that can automatically correlate hundreds of stratigraphic tops that will encompass thousands of well logs. The new approach – a software Python package, ChronoLog – will potentially change how such compilations are done.

American Association of Petroleum Geologists (AAPG)
Explorer Emphasis Article

They might have to invent a new designation for the Anadarko Basin: “super-super basin.” An extraordinarily deep basin, it towers far above the standard definition of a Super Basin – a basin containing multiple reservoirs and source rocks with cumulative production of at least 5 billion barrels of oil equivalent, and future production potential of more than 5 billion boe. The Anadarko has all that and more.

American Association of Petroleum Geologists (AAPG)
Learn! Blog

Fossils and microfossils can be used to determine information about evaporites as well as carbonates and clastics. This is an area that is growing in importance. Join Susan Nash for an interview with Gil Machado, Ph.D. from the University of Lisbon who discusses salt biostratigraphy and its new usefulness.

American Association of Petroleum Geologists (AAPG)
Asia Pacific Blog

AAPG Asia Pacific is proud to announce the first two sessions of AAPG Asia Pacific Presents, a collection of online presentations being offered free of charge.

American Association of Petroleum Geologists (AAPG)
Explorer Article

Some 257 people gathered at the beautiful new Hilton Hotel in Port Moresby, Papua New Guinea in the last week of February 2020 to attend the first AAPG/EAGE Papua New Guinea Petroleum Geoscience Conference and Exhibition. The theme for the conference was, “PNG’s Oil and Gas Industry Maturing Through Exploration Development and Production.”

American Association of Petroleum Geologists (AAPG)
Webinar
Virtual Webinar
Wednesday, 15 July 2020, 7:00 p.m.–8:30 p.m.

Join us for 'New Subsurface Tools and Techniques'. New Subsurface Tools and Techniques and strategies for pivoting for new revenue and diversification in today's times. This webinar will be presented via Zoom 7pm - 8:30pm CDT, 15 July 2020.

American Association of Petroleum Geologists (AAPG)
Webinar
Virtual Webinar
Friday, 11 December 2020, 11:30 a.m.–12:30 p.m.

In a world moving to net-zero emissions during the COVID-driven oil price collapse, there remain important scientific and business opportunities for geoscientists, particularly those with expertise in stratigraphy, sedimentology, reservoir geology and hydrocarbon production. In this webinar, Dr. Julio Friedmann, senior research scholar, Center on Global Energy Policy, Columbia University discusses the challenges this community faces which are not scientific or technical, but rather involve shifts in business model, policy and global market trends. Webinar presented via Zoom on 11 December 2020 at 11:30 am CST (UTC-6).

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American Association of Petroleum Geologists (AAPG)
Online e-Symposium
Thursday, 11 February 2010, 12:00 a.m.–12:00 a.m.

Gas hydrates, ice-like substances composed of water and gas molecules (methane, ethane, propane, etc.), occur in permafrost areas and in deep water marine environments.

American Association of Petroleum Geologists (AAPG)
Online e-Symposium
Wednesday, 31 October 2012, 12:00 a.m.–12:00 a.m.

This e-symposium will focus on how surface geochemical surveys and Downhole Geochemical Imaging technologies can be utilized jointly to directly characterize the composition of hydrocarbons vertically through the prospect section.

American Association of Petroleum Geologists (AAPG)
Webinar
Virtual Webinar
Tuesday, 14 April 2020, 4:00 p.m.–6:00 p.m.

The Upper Jurassic (Oxfordian) Smackover Formation is one of the most prolific oil and gas producers in the northeastern Gulf of Mexico coastal plain, where it deposited in a proximal carbonate ramp. This study is a comprehensive characterization of the depositional environment of the Smackover based on 3D seismic and well data from wells in the Vocation and Appleton oil fields located in the Conecuh and Manila Sub-basins in southwest Alabama.

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American Association of Petroleum Geologists (AAPG)
Online e-Symposium
Thursday, 28 July 2011, 12:00 a.m.–12:00 a.m.

This presentation discusses one operator’s approach to fully integrate data captured in the Marcellus Shale in order to optimize horizontal well performance.

American Association of Petroleum Geologists (AAPG)
Online e-Symposium
Thursday, 9 September 2010, 12:00 a.m.–12:00 a.m.

The presentation will focus on hydraulic fracture geometry in shales, the materials used in the fracturing process, and treatment monitoring via microseismic.

American Association of Petroleum Geologists (AAPG)
Webinar
Virtual Webinar
Tuesday, 1 September 2020, 8:00 a.m.–9:00 a.m.

The “Great Crew Change” has become the “Competence Train Wreck” due to the repeated personal mis-management practices of our industry and again not anticipating the known volatility of commodity prices. Despite this, hydrocarbon based energy will continue to comprise over 60% of the world’s energy mix for at least the next half century and of that energy need over half of it has yet to be found! Personal experience in working for National Oil Companies, Parastatals, large independent oil companies, small independents, as an independent and as a consultant have given me the perspective of some of the best and some of the worst of the exploration practices the industry has to offer.

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American Association of Petroleum Geologists (AAPG)
Webinar
Virtual Webinar
Tuesday, 5 May 2020, 12:00 p.m.–1:00 p.m.

Sequence stratigraphy is a method for stratigraphic interpretation, pioneered by Vail and colleagues in the mid 70’s, which explains the complex geometries that sediments create as they fill accommodation in response to changes in rates of sedimentation, subsidence, uplift and eustasy. This method was developed based on observations and concepts developed as early as in the 1800’s. Based on this strong scientific foundation, pioneer work from Caster, Sloss, Wheeler, Campbell, and Asquith established the basis for the methodology. These researchers established a new way to correlate stratigraphic units, demonstrating the time-transgressive nature of lithostratigraphic formations.

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American Association of Petroleum Geologists (AAPG)
Webinar
Virtual Webinar
Wednesday, 9 February 2022, 8:00 a.m.–9:00 a.m.

 This talk will provide information to better understand the principles of surface geochemistry (SG), how best to use SG data in exploration or development programs, how to develop a cost effective sampling and analytical program, and will also explore best practices for the interpretation and integration of SG data.

American Association of Petroleum Geologists (AAPG)
VG Abstract

The carbonate sequences that were deposited in the now exhumed Tethyan Ocean influence many aspects of our lives today, either by supplying the energy that warms our homes and the fuel that powers our cars or providing the stunning landscapes for both winter and summer vacations. They also represent some of the most intensely studied rock formations in the world and have provided geoscientists with a fascinating insight into the turbulent nature of 250 Million years of Earth’s history. By combining studies from the full range of geoscience disciplines this presentation will trace the development of these carbonate sequences from their initial formation on the margins of large ancient continental masses to their present day locations in and around the Greater Mediterranean and Near East region. The first order control on growth patterns and carbonate platform development by the regional plate-tectonic setting, underlying basin architecture and fluctuations in sea level will be illustrated. The organisms that contribute to sequence development will be revealed to be treasure troves of forensic information. Finally, these rock sequences will be shown to contain all the ingredients necessary to form and retain hydrocarbons and the manner in which major post-depositional tectonic events led to the formation of some of the largest hydrocarbon accumulations in the world will be demonstrated.

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Request a visit from Keith Gerdes!

American Association of Petroleum Geologists (AAPG)
DL Abstract

As oil and gas exploration and production occur in deeper basins and more complex geologic settings, accurate characterization and modeling of reservoirs to improve estimated ultimate recovery (EUR) prediction, optimize well placement and maximize recovery become paramount. Existing technologies for reservoir characterization and modeling have proven inadequate for delivering detailed 3D predictions of reservoir architecture, connectivity and rock quality at scales that impact subsurface flow patterns and reservoir performance. Because of the gap between the geophysical and geologic data available (seismic, well logs, cores) and the data needed to model rock heterogeneities at the reservoir scale, constraints from external analog systems are needed. Existing stratigraphic concepts and deposition models are mostly empirical and seldom provide quantitative constraints on fine-scale reservoir heterogeneity. Current reservoir modeling tools are challenged to accurately replicate complex, nonstationary, rock heterogeneity patterns that control connectivity, such as shale layers that serve as flow baffles and barriers.

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Request a visit from Tao Sun!

American Association of Petroleum Geologists (AAPG)

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