EIA's Petroleum Supply Monthly report shows oil production in the lower 48 states has increased over the last three years.
A new hierarchical architectural classification for clastic marginal-marine depositional systems is presented and illustrated with examples. In ancient rocks, the architectural scheme effectively integrates the scales of sedimentology (core, outcrop) and sequence stratigraphy (wireline-log correlation, reflection seismic). The classification also applies to modern sediments, which allows for direct comparison of architectural units between modern and ancient settings. In marginal-marine systems, the parasequence typically defines reservoir flow units. This classification addresses subparasequence scales of stratigraphy that commonly control fluid flow in these reservoirs. The scheme consists of seven types of architectural units that are placed on five architectural hierarchy levels: hierarchy level I: element (E) and element set (ES); hierarchy level II: element complex (EC) and element complex set (ECS); hierarchy level III: element complex assemblage (ECA); hierarchy level IV: element complex assemblage set (ECAS); and hierarchy level V: transgressive-regressive sequence (T-R sequence). Architectural units in levels I to III are further classified relative to dominant depositional processes (wave, tide, and fluvial) acting at the time of deposition. All architectural units are three-dimensional and can also be expressed in terms of plan-view and cross-sectional geometries. Architectural units can be linked using tree data structures by a set of familial relationships (parent-child, siblings, and cousins), which provides a novel mechanism for managing uncertainty in marginal-marine systems. Using a hierarchical scheme permits classification of different data types at the most appropriate architectural scale. The use of the classification is illustrated in ancient settings by an outcrop and subsurface example from the Campanian Bearpaw–Horseshoe Canyon Formations transition, Alberta, Canada, and in modern settings, by the Mitchell River Delta, northern Australia. The case studies illustrate how the new classification can be used across both modern and ancient systems, in complicated, mixed-process depositional environments.
Isolated carbonate buildups (ICBs) are commonly attractive exploration targets. However, identifying ICBs based only on seismic data can be difficult for a variety of reasons. These include poor-quality two-dimensional data and a basic similarity between ICBs and other features such as volcanoes, erosional remnants, and tilted fault blocks. To address these difficulties and develop reliable methods to identify ICBs, 234 seismic images were analyzed. The images included proven ICBs and other features, such as folds, volcanoes, and basement highs, which may appear similar to ICBs when imaged in seismic data. From this analysis, 18 identification criteria were derived to distinguish ICBs from non-ICB features. These criteria can be grouped into four categories: regional constraints, analysis of basic seismic geometries, analysis of geophysical details, and finer-scale seismic geometries. Systematically assessing the criteria is useful because it requires critical evaluation of the evidence present in the available data, working from the large-scale regional geology to the fine details of seismic response. It is also useful to summarize the criteria as a numerical score to facilitate comparison between different examples and different classes of ICBs and non-ICBs. Our analysis of scores of different classes of features suggests that the criteria do have some discriminatory power, but significant challenges remain.
April brought AAPG members to Washington, D.C., for visits with federal agencies and Senate and House offices.
This will be my last column in the EXPLORER as president for DEG. In June I will turn over the reins to Doug Wyatt, and I wish him well.
The U.S. Geological Survey crunched some more numbers with their eyes on the Bakken Formation in North Dakota and Montana. The results are in and the estimates are even larger.
Complex considerations: Mention the Bakken Formation and most people think of unlimited potential – but several dynamics have a huge impact on productivity.
Japan has taken a leap forward in natural gas production by conducting the first successful production test of natural gas from marine hydrates. Could this be the“bridge” fuel needed in the coming energy transition?
Best foot forward: Trying to make a deal? It isn’t always the property or the prospect that’s being sold.
This story is an illustration of how a single geologist working for a major company can develop new exploration concepts in a “mature basin” and turn it into one of that company’s most successful plays in the onshore United States.
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Sponsorships are now available for the American Association of Petroleum Geologists' 2020 Annual Convention and Exhibition (ACE) to be held 7–10 June, in Houston, Texas.
One of the main objectives of petroleum exploration consists of predicting reservoir location. Data collected in the basin are used to better understand the sedimentary architecture, but are usually insufficient to accurately characterize this architecture.
Book Now! Exhibit and Sponsorship Opportunities Available. The American Association of Petroleum Geologists (AAPG) 2020 Annual Convention and Exhibition (ACE) will be held 7–10 June, at the George R. Brown Convention Center in Houston, Texas. ACE remains a symbol and the intellectual headquarters for providing the technology, science, and skills to help fuel our future.
Exhibit space is available for the American Association of Petroleum Geologists' 2020 Annual Convention and Exhibition (ACE) to be held 7–10 June, in Houston, Texas.
The 2020 International Conference and Exhibition (ICE) call for abstracts is now open. Now is the time to share your knowledge, insights, and research to help guide our geosciences community to expand frontiers and unlock resources for future generations.
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