Stephen Cossey

Stephen Cossey
Cossey & Associates Inc. · Research

PhD

About

90
Publications
14,835
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272
Citations
Citations since 2016
32 Research Items
162 Citations
20162017201820192020202120220102030
20162017201820192020202120220102030
20162017201820192020202120220102030
20162017201820192020202120220102030
Introduction
Steve is a consulting geologist and chief geoscientist with Cossey and Associates Inc. His current research interests are the Geology of Mexico, specifically the Tampico-Misantla Basin and the Chicontepec Formation (Wilcox equivalent). He also continues compiling a worldwide field and reservoir database on fields and discoveries in deepwater reservoirs and a database of architectural elements from deepwater clastic outcrops around the world. Methodology in Mexico involves basic field mapping, section measurement, Wheeler diagram construction, outcrop sampling and core description which is integrated into a regional depositional model and chronologic depositional history.
Education
September 1976 - February 1978
University of South Carolina
Field of study
  • Geology
August 1974 - September 1976
University of South Carolina
Field of study
  • Geology
August 1971 - June 1974
University of Wales
Field of study
  • Geology

Publications

Publications (90)
Article
Full-text available
The offshore Talara Basin is the western extension of the hydrocarbon producing onshore fields since the mid-1800s area of Peru and is also located above the subduction zone of the active continental margin of South America. The offshore portion was evaluated using high quality 3D seismic where mapping horizons are all unconformities within the Eoc...
Preprint
Full-text available
The offshore Talara Basin is the western extension of the hydrocarbon producing onshore fields since the mid-1800s area of Peru and is also located above the subduction zone of the active continental margin of South America. The offshore portion was evaluated using high quality 3D seismic where mapping horizons are all unconformities within the Eoc...
Article
Full-text available
The offshore Talara Basin is the western extension of the hydrocarbon producing onshore fields since the mid-1800s area of Peru and is also located above the subduction zone of the active continental margin of South America. The offshore portion was evaluated using high quality 3D seismic where mapping horizons are all unconformities within the Eoc...
Article
Full-text available
We provide an update on the Gulf of Mexico Paleogene water-level drawdown hypothesis by revising and augmenting the original observations to provide new grounds for the continuing assessment of this concept, which has important implications for hydrocarbon exploration. This paper assimilates information on 7 issues from a variety of sources that su...
Article
Full-text available
The Paleogene Chicontepec Formation of the Tampico-Misantla Basin (TMB) in eastern Mexico contains numerous forms of bitumen, such as clasts within debrites, fault and fracture fillings, dikes, mounds, and depositional beds. A sampling program was conducted within the basin to investigate the sequence of migration events using the geological settin...
Article
Full-text available
Zama Field was discovered by Talos Energy in 2017 in Block 7 in the Salina de Istmo Basin, offshore Mexico. The reservoirs are deep marine turbidite sandstones of Tortonian (late Miocene) age. The main trapping mechanism is structural (three-way dip with a fault on the east side) with a regional dip to the west, northwest and southwest. The thick r...
Chapter
New and existing strontium isotope data are given for several widespread evapo-rites from western equatorial Pangea. The data indicate evaporite deposition occurred on proximal margins of the Gulf of Mexico at ca. 169 Ma (Bajocian, not Callovian as commonly thought) and 166 Ma in Trinidad (Bathonian-Callovian boundary). The 166 Ma age may also appl...
Article
New and existing strontium isotope data are given for several widespread evaporites from western equatorial Pangea. The data indicate evaporite deposition occurred on proximal margins of the Gulf of Mexico at ca. 169 Ma (Bajocian, not Callovian as commonly thought) and 166 Ma in Trinidad (Bathonian-Callovian boundary). The 166 Ma age may also apply...
Experiment Findings
Full-text available
A brief study of 72 hydrocarbon sands in the central and western Gulf of Mexico to determine below what depths amplitude anomalies will not be observed. There appears to be a general westward deepening trend, below which amplitude anomalies should not be seen.
Article
Full-text available
At least five major paleo-canyons have been identified in sediment sequences along the western flank of the Tampico-Misantla Basin in eastern Mexico. These were formed during the late Paleocene (~56 Ma) and cut into thick unconsolidated Paleocene bathyal sediments. Sediments within two of these canyons have been studied in more detail. The Acatepec...
Conference Paper
Full-text available
Sequence stratigraphic principles combined with biostratigraphic data improve the recognition of stratigraphic successions, genetic units, and stratigraphic surfaces. Graphic correlation can further assist by identifying and quantifying apparent hiatal surfaces between depositional sequences. These apparent hiatal surfaces can be the result of sign...
Conference Paper
Full-text available
Many oil and gas fields in the deepwater Gulf of Mexico produce hydrocarbons from thin-bedded channel/levee reservoirs where one of the unknown parameters is the connectivity between the channel and the levee sediments. Often, the coarser and higher net/gross sandstones in the associated channel are water-wet and do not appear to be in pressure con...
Research
Full-text available
Six paleocanyons have recently been identified on the western flank of the Tampico-Misantla Basin in eastern Mexico in an area of generally poor natural outcrops. Recent road cuts have opened new opportunities to study the stratigraphy of the area. The canyons were formed at about 56 Ma when fluvial systems eroded into the exposed Paleocene basin-f...
Article
The 86 fields and discoveries in the central Mississippi Canyon, Atwater Valley, western DeSoto Canyon, and Lloyd Ridge protraction areas are summarized with production characteristics and representative seismic profiles and wire-line logs. Three trap styles are recognized: four-way closure, three-way closure, and stratigraphic. The reservoirs in n...
Article
The northern deep-waterGulf ofMexico is one of themost active deep-water petroleum provinces in the world. This paper introduces the regional geologic setting for the northern deep-water Gulf of Mexico and briefly discusses the importance of technology in developing the area's resources. Exploration has focused on four major geologic provinces: Bas...
Conference Paper
Full-text available
The middle slope of offshore Peru (500 to 2000m water depth) consists of a series of intraslope basins filled with Eocene (?) deepwater deposits. The region has an especially complex structural and stratigraphic history during the Cenozoic. The basins vary in their structural styles, indicating complex tectonics likely associated with the Andean su...
Article
Full-text available
This is a classic geological detective story, set in remote eastern Mexico, full of unique characters, mystery and intrigue. Like all geological stories, it is incomplete, but may turn our understanding of the Gulf of Mexico literally upside down, and could possibly answer the question of what caused one of the greatest climate changes in geologica...
Presentation
Full-text available
A presentation on the KPg deposits in the Tampico-Misantla basin from some outcrops and the subsurface. An extensive breccia is described.
Conference Paper
Full-text available
Carbonate breccias were described in the subsurface at the base of the Paleogene section (Chicontepec Formation) in the southern Tampico-Misantla Basin over 65 years ago. Subsurface mapping suggests these breccias were eroded from the Tuxpan Platform to the east. Without an obvious drop in sea level at the end of the Cretaceous, a plausible explana...
Conference Paper
Full-text available
Newly acquired U-Pb ages of detrital zircons from the Difunta Group, NE Mexico, and the Chicontepec Formation of the Tampico-Misantla Basin, 700 km to the southeast, indicate that both units are correlative with the Wilcox Group of Texas. Concordant analyses of detrital zircon ages of Difunta and Chicontepec samples are dominated by Late Cretaceous...
Research
http://www.aapg.org/publications/blogs/learn/article/articleid/34140/eastern-mexicos-new-potential-both-onshore-and-offshore-interview-with-stephen-cossey
Conference Paper
Full-text available
The undrilled deepwater Talara Basin is located along the northern Pacific margin of Peru. It is the western component of the Cretaceous-Tertiary stratigraphy of the large, traditional reservoirs of the onshore Talara Basin oilfields, which have been produced over 1.5 billion barrels of oil in the last one hundred years. However, this basin is also...
Conference Paper
Full-text available
Outcrops of the Paleocene/Eocene Chicontepec Formation in eastern Mexico have provided a unique opportunity to study exposed time equivalent sections of the deepwater Gulf of Mexico's Wilcox Formation. A 2012 study established a stratigraphic framework in the Tampico-Misantla Basin (TMB) and identified sequence boundaries that could not be correlat...
Article
Full-text available
Outcrops of the Paleocene/Eocene Chicontepec Formation in eastern Mexico have provided a unique opportunity to study exposed time-equivalent sections of the deepwater Gulf of Mexico (GOM) Wilcox Formation. A 2012 study established a stratigraphic framework in the Tampico-Misantla Basin (TMB) and identified sequence boundaries that could not be corr...
Conference Paper
A detailed biostratigraphic analysis and stratigraphic framework of the Paleocene and Eocene Chicontepec Formation in the Tampico-Misantla Basin, onshore eastern Mexico was conducted in 2012 using 33 wells. This study enabled a better understanding of the geological history of the this basin and how it fits into the history of the entire Gulf of Me...
Conference Paper
Full-text available
A detailed biostratigraphic analysis and stratigraphic framework of the Paleocene and Eocene Chicontepec Formation in the Tampico-Misantla basin, onshore eastern Mexico, was conducted using 33 wells. The objective was to have an independent re-evaluation of the geological framework for future evaluation of the resources. The Eocene and upper Paleoc...
Conference Paper
Full-text available
A large complex of sedimentary injection features (injectites) has been identified in the Pliocene offshore Shwe (biogenic) Gas Field in Myanmar. The injectites provide vertical and lateral continuity from a basal proximal lobe sequence (G5) to an overlying distal lobe sequence (G3). The G5 has a unique petrographic signature (low rock fragments, h...
Patent
Full-text available
A computer based method for determining a characteristic of a material, including accepting as input to a specially programmed portable computer, and using a processor for the computer, image data, for a surface of a material. The image data is accepted from a device including a light source and a magnifying element. Using the processor, the method...
Preprint
Full-text available
Many of the producing oil fields in the Llanos Basin of Colombia are located at a great distance from the potential traditional kitchens associated to the foothills of the Eastern Cordillera. In the last few years, exploration drilling, gravimetric models and new seismic interpretation in the Eastern Llanos Basin of Colombia has yielded evidence fo...
Article
Full-text available
In recent years, there has been a growing interest in the origin and evolution of the Colombian Caribbean Margin (CMC) by both academia and the petroleum industry. Conflicting hypotheses have emerged of the regional tectonic context and nature of the boundary of the Caribbean and South American plates. Many authors describe the subduction of the Ca...
Conference Paper
The Paleocene and Eocene Chicontepec Basin of eastern Mexico has been a topic of interest to geologists ever since a large "paleocanyon" was discovered in the subsurface to the southwest of Poza Rica. Previous models have been unsuccessful in explaining over 600 meters of erosion in the canyon, where in places the Tertiary unconformably overlies th...
Conference Paper
Chicontepec turbidites were deposited in an elongated foreland basin between the active Sierra Madre Oriental (SMO) fold thrust belt and Tuxpan Platform during the Paleocene and Eocene. An attempt has been made to unravel the complex spatial and temporal geologic patterns in the northern part of Chicontepec foredeep by integrating available 3D seis...
Conference Paper
Deep-water hydrocarbon exploration has generated lsrge volumes of well and seismic data over the last 30+ years. However, reservoir geologists and production engineers are always faced with a lack of data in the sub‐seismic and super‐well quantitative data when it becomes time to populate a static reservoir model and constrain flow simulation in dy...
Conference Paper
The complex Paleocene-Eocene sedimentary succession of the Chicontepec Formation is extensively exposed within the western margin of the Tampico-Misantla Basin in east-central Mexico. This clastic sequence records deposition in a deep-marine foredeep developed in response to the onset of the Sierra Madre Oriental fold and thrust belt. The Chicontep...
Chapter
Full-text available
In early 2006, a study of the characteristics of deep-water fields and reservoirs was completed by the authors (Cossey and Studlick, 2007). Since that time, 73 discoveries have been added to the worldwide inventory of deep-water fields. Most of the newer discoveries have been made in Gulf of Mexico, but other notable discoveries have been made in C...
Chapter
The Chicontepec Formation in eastern central Mexico has long been explored for its oil accumulations and contains several large unconformities, which in the past seem to have been miscorrelated across the Tampico-Misantla Basin. The formation is of current interest because it may help us to understand the mechanisms of delivery of the Wilcox sands...
Chapter
The informally named Cigar and Dog outcrops are amalgamated channels and minor mass-transport complexes within a Tortonian- age submarine-fan complex in the Tabernas basin of southeast Spain. The submarine-fan complex within the Chozas Formation has been mapped in detail by Kleverlaan (1989). He named the lowermost, sand-rich fan complex “System 1”...
Conference Paper
The Paleocene Chicontepec Formation crops out along the western margin of the Tampico embayment, also known as the Tampico-Misantla basin, located in NE Mexico. The sequence records deposition in a deep-marine, foreland basin between the Golden Lane Atoll and the Sierra Madre Oriental. In the northern part of this outcrop belt, slope deposition is...
Conference Paper
An integrated study of eight Gulf of Mexico fields, one West Africa field, several outcrops and modern systems has shown that thin-bedded turbidite (levee) reservoirs have certain characteristics that can be exploited in the development of these reservoirs to optimize pro­duction. A detailed reservoir model was developed from outcrops and modern le...
Article
Full-text available
Next July will mark the 30th anniversary of the first field discovered in the deepwater Gulf of Mexico province, defined here as water depth of greater than 600 feet (183 meters). Since 1975, when the first commercial field (Cognac) was discovered by Shell, over 21.2 billion barrels of oil equivalent have been discovered in the province and approxi...
Conference Paper
Subsurface object modeling of Deep-water Clastics relies heavily on analogue outcrop dimensional data for architectural elements. Unfortunately, these outcrops are mostly 2D examples and good 3D outcrops are extremely rare. Object modeling of deep-water clastic reservoirs can be approached in two ways: a) Using a single analogue outcrop as a model...
Conference Paper
Full-text available
A goal of field development is to place high rate, productive wells in sweet spots or areas where pay is thickest. However, thick pay does not necessarily mean high flow rates. Producibility (normalized flow rate) of a reservoir should be used in conjunction with pay thickness to locate sweet spots. This study uses data from over 159 completions in...
Technical Report
Full-text available
A cross-section was constructed from the Grand Canyon, Arizona to the oil and gas producing region of southeast New Mexico using well and outcrop measured sections at 28 locations. Both chronostratigraphic and lithostratigraphic units are shown. The stratigraphy and tectonics of the area immediately adjacent to the cross-section are described in th...
Chapter
Full-text available
The two outcrops described here are located in the Tabernas Basin in southern Spain, c. 50 km north of Almeria. They are in close proximity and perpendicular to one another. They are part of a Tortonian sand-rich submarine fan complex within the Chozas Formation of the Tabernas Basin. The sand-rich fan complex has been mapped in great detail by Kle...
Conference Paper
Traditional analog studies have focused on geologic similarities but neglected engineering differences vital to understanding producibility. Often, these qualitative comparisons are likened to comparisons of apples to oranges. In an effort to constrain the risk of producibility in prospect ranking, appraisal and development planning, 140 well compl...
Chapter
Full-text available
The geoscientist is usually the provider of semi-quantitative data on deepwater clastic architectural elements in the integrated reservoir modeling process. These data can take the form of aspect ratios, vertical and lateral frequencies, or orientations. The arrangement and internal variability of the elements determines the ratio of vertical to ho...
Article
Full-text available
The Oligocene Hackberry sequence was deposited in a slope environment consisting of an irregular, updip slide scar, a rotational slide zone up to 4 mi (6.5 km) wide, and a downdip region more than 20 mi (32 km) wide where meandering submarine channels deposited thick turbiditic sands. The shelf margin slides probably began during the late stage of...
Patent
Full-text available
The ornamental design for a combined portable can opener and cleaner, as shown.
Conference Paper
The Hackberry is a middle Oligocene bathyal sequence restricted to the subsurface in an embayment in southeast Texas and southwest Louisiana. Previous workers have subdivided the Hackberry into the updip play north of a line of salt domes, and the downdip play to the south. The updip play in Louisiana is an area of rotational block faulting, but it...
Technical Report
Full-text available
A transect of Devonian and early Carboniferous rocks in the eastern Meseta of Morocco shows a transition from east to west of shallow to deeper water depositional environments. These environments include fluvial, deltaic, algal-brachiopod buildups, carbonate turbidites and slope deposits containing exotic blocks. The structural history of the area...
Article
It is recommended that uranium exploration geologists become familiar with the resistance log responses in point-bar environments and use these characteristics in exploration in addition to the usual color and gamma guides. Point-bar sediments in deltaic environments and in close proximity to barrier-island deposits may contain two oxidation cells....
Article
Full-text available
We recommend that Uranium exploration geologists become familiar with the resistance log responses in point-bar environments and use these characteristics in exploration, in addition to the usual color and gamma ray guides. Point-bar sediments in deltaic environments and in close proximity to barrier-island deposits may contain two oxidation cells....
Conference Paper
Seismic hydrocarbon indicators (HCI's) have aided in identification and mapping of gas accumulations in the clastic Miocene Arang Formation in the South China Sea. Two structures drilled in Block B, Indonesia, Bawal and Tembang, provide excellent control for the comparison of known pay zones and their associated seismic expression, with seismicampl...
Article
Full-text available
Small elongate mud rip-up clasts within carbonate turbidite sequences were used as paleocurrent indicators in a Jurassic carbonate-slope environment. The clast lineations were proved to be consistently parallel to flute-cast directions and consistent throughout the thickness of a turbidite bed. This type of lineated mud clast may be a useful paleoc...
Thesis
Full-text available
The middle and upper Jurassic of djebel Bou Kornine in Northern Tunisia consists of two thick (Bathonian) mass movement deposits separated by turbidite sequences. The underlying Bajocian consists of a complex of minor mass movement deposits. The lowest Bathonian mass movement deposit originated as a liquefaction flow of clasts resting on unconsolid...
Conference Paper
Full-text available
A Jurassic mass-movement deposit is exposed on Bou Kornine in northern Tunisia. It is up to 75 m thick and is part of a carbonate-slope sequence with some characteristics of a debris-flow deposit. However, this deposit is interpreted to be the result of liquefaction of under-consolidated carbonate silt, upon which rounded boulders, cobbles, and peb...
Article
Full-text available
The modes of occurrence of a Silurian atrypid and a Devonian rhynchonellid near Khenifra in central Morocco are described. They are both thought to have lived on isolated shoals within muddy basins. A substrate for brachiopod attachment in each case was provided by lime-secreting algae. Most of the Devonian rhynchonellids are preserved in olistostr...