CARBONATE RESERVOIR ANALOGUES: PLAY CONCEPTS AND CONTROLS ON POROSITY Early Tuition
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Select lacustrine and marine depositional settings show a spectrum of styles of carbonate deposition and illustrate the types of carbonates, with an emphasis on microbialites and tufa, to be expected in early rift settings. Early rift lake examples examined in this review article are all from East Africa: Lakes Turkana, Bogoria, Natron and Magadi, Manyara, and Tanganyika. Other lake examples include four from the western United States (Great Salt Lake and high lake level Lake Bonneville, Mono Lake and high lake level Russell Lake, Pyramid Lake and high lake level Lake Lahontan, and Searles Lake) and two from Australia (Lakes Clifton and Thetis). Marine basin examples are the Hamelin Pool part of Shark Bay from Australia (marginal marine) and the Red Sea (marine rift).
Landsat images and digital elevation models for each example are used to delineate present and past lake-basin margins based on published lake-level elevations, and for some examples, the shorelines representing different lake levels can be compared to evaluate how changes in size, shape, and lake configuration might have impacted carbonate development. The early rift lakes show a range of characteristics to be expected in lacustrine settings during the earliest stages of continental extension and rifting, whereas the Red Sea shows well advanced rifting with marine incursion and reef–skeletal sand development. Collectively, the lacustrine examples show a wide range of sizes, with several of them being large enough that they could produce carbonate deposits of potential economic interest. Three of the areas—Great Salt Lake and high lake level Lake Bonneville, Pyramid Lake and high lake level Lake Lahontan, and the Red Sea—are exceedingly complex in that they illustrate a large degree of potential depositional facies heterogeneity because of their size, irregular pattern, and connectivity of subbasins within the overall basin outline.
We reviewed the tectonostratigraphic evolution of the Jurassic–Cenozoic collision between the North American and the Caribbean plate using more than 30,000 km (18,641 mi) of regional two-dimensional (2-D) academic seismic lines and Deep Sea Drilling Project wells of Leg 77. The main objective is to perform one-dimensional subsidence analysis and 2-D flexural modeling to better understand how the Caribbean collision may have controlled the stratigraphic evolution of the offshore Cuba region.
Five main tectonic phases previously proposed were recognized: (1) Late Triassic–Jurassic rifting between South and North America that led to the formation of the proto-Caribbean plate; this event is interpreted as half grabens controlled by fault family 1 as the east-northeast–south-southwest–striking faults; (2) Middle–Late Jurassic anticlockwise rotation of the Yucatan block and formation of the Gulf of Mexico; this event resulted in north-northwest–south-southeast–striking faults of fault family 2 controlling half-graben structures; (3) Early Cretaceous passive margin development characterized by carbonate sedimentation; sedimentation was controlled by normal subsidence and eustatic changes, and because of high eustatic seas during the Late Cretaceous, the carbonate platform drowned; (4) Late Cretaceous–Paleogene collision between the Caribbean plate, resulting in the Cuban fold and thrust belt province, the foreland basin province, and the platform margin province; the platform margin province represents the submerged paleoforebulge, which was formed as a flexural response to the tectonic load of the Great Arc of the Caribbean during initial Late Cretaceous–Paleocene collision and foreland basin development that was subsequently submerged during the Eocene to the present water depths as the arc tectonic load reached the maximum collision; and (5) Late Cenozoic large deep-sea erosional features and constructional sediment drifts related to the formation of the Oligocene–Holocene Loop Current–Gulf Stream that flows from the northern Caribbean into the Straits of Florida and to the north Atlantic.
Added to the "first-time-ever” list was the announcing of paper and poster awards at the end of the event.
Closest of trends: Geoscientists experienced a huge “aha!” moment that started with the realization that Pennsylvania’s Marcellus Shale and Texas’ Eagle Ford Shale have a lot in common.
A new, specially funded, designated speaker has been added to the prestigious AAPG Distinguished Lecture program for the 2012-13 season.
Look again: The North Sumatra Basin, a world-class petroleum province since the late 19th century, is getting a 21st century reboot.
Surprise! Ordinarily a target for oil production, the Cretaceous Niobrara formation is proving to be more versatile in Colorado’s Piceance Basin.
Spreading the word: Nine speakers have been selected for AAPG’s prestigiousDistinguished Lecture program for the 2012-13 North American tours.
Exotic beauty: Malaysia’s Langkawi Geopark is a beautiful creation for tourists. For geologists, it’s paradise.
Differential compaction has been used by seismic interpreters to map features of exploration interest, such as carbonate build-ups, fans and fluvial channels.
The Midland Playmaker Forum is focused on new and emerging plays of interest to sections or regions, with a broad global appeal to explorers in all locations. Its emphasis is the process of turning a prospect into a discovery and therefore complements the existing prospect expos.
The London Playmaker Forum is focused on new and emerging plays of interest to sections or regions, with a broad global appeal to explorers in all locations. Its emphasis is the process of turning a prospect into a discovery and therefore complements the existing prospect expos.
The course starts with patterns of carbonate deposition and moves on to an examination of modern analogs for ancient sediments, diagenesis, and select case histories of Paleozoic and Mesozoic basin reservoirs.
This course will alternate between lectures and practical exercises involving cores, logs and seismic data.
This short course is designed to provide information to facilitate exploration for microbial carbonate buildups and associated reservoir facies and to assist with the formulation of development plans for fields producing from microbial carbonates. The course consists of a series of seven lectures supplemented by core samples.
The overall goal of this course is to provide tools for efficient and effective re-exploration and development. It uses a two-part approach. First it uses petrophysical analysis to understand all that can be derived from examination of standard open-hole logs. This is followed by integrated approaches to discover key factors controlling oil and gas distribution in carbonate reservoirs in the greater Midcontinent USA. Methodologies and workflows reviewed include geosteering and evaluation of horizontal wells and optimizing carbon storage utilization and management.
The field seminar develops and evaluates the sequence stratigraphic framework and controls on location and reservoir character of Upper Miocene-Pliocene carbonate sequences from a variety of carbonate systems within the context of the regional paleogeography.
Take advantage of this unique opportunity to learn all the aspects related to the understanding and modeling of fractured reservoirs. Attendees will take geologic concepts and use them in reservoir modeling through hands-on sessions devoted to the examination of outcrop, core and log data. They will use that information and a software to create 3D fractured reservoir models. Using actual Teapot Dome (Wyoming, USA) field data from the Tensleep and Niobrara Shale formations and a hands-on approach, the workshop allows the geoscientist to identify fractures and to construct predictive 3D fracture models that can be used to identify productive zones, plan wells and to create fracture porosity and permeability models for reservoir simulation.
The Hay River region in the Northwest Territories is one of the best locations in North America for the examination of Devonian carbonates, and the Pine Point mine site is one of the best localities for viewing the fabrics and geometries associated with hydrothermal dolomitization.
Participants will learn a specific and comprehensive methodology for finding and developing conventional and unconventional oil and gas resources associated with lake deposits. The seminar will start with the Quaternary Bonneville basin in Utah, to build familiarity with lacustrine depositional processes. Participants then examine world-famous exposures of organic-rich mudstone, fluvial sandstone, and carbonate microbialite facies in Wyoming.
The main part of the field seminar will focus on the description of the fractured carbonates and the extrapolation from the outcrop observations to the subsurface for building geologically plausible reservoir models.
The course will review core data, petrophysical comparisons, rock physics modeling (including pseudo logs and mechanical properties).
There are more approximately 1,000 oil and gas fields in the world that have been classified as "giant," containing more than 500 million barrels of recoverable oil and /or 3 trillion cubic feet of gas.
Unger Field, discovered in1955, has produced 8.6 million barrels of oil from a thinly (several ft) bedded, locally cherty dolomite containing vuggy and intercrystalline porosity.
This e-symposium will be introducing signal processing techniques as a means to maximize extracting geomechanical data from petrophysical logs.
The entire Middle Pennsylvanian–to–top Precambrian basement (500 m) interval was cored in early 2011 in the BEREXCO Wellington KGS #1-32 well in Wellington Field, Sumner County, KS.
This work investigates how heterogeneity can be defined and how we can quantify this term by describing a range of statistical heterogeneity (e.g. coefficient of variation and the Lorenz coefficient).
The Niobrara Petroleum System of the U.S. Rocky Mountain Region is a major tight petroleum resource play.
This e-symposium is ideal for geologists, geophysicists, engineers and other geoscientists who are involved in gas shale exploration and production.
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