This report is on the summary of a play in the Snark dataset from the northwest coast of Australia. I have used Petrel to analyze and interpret this dataset. The Snark dataset lies within the Barrow basin which is home to many promising and producing oil fields such as Barrow Island which is the largest onshore discovery in Australia.
Figure 1. Northwest coast of Australia with red star showing location of Snark survey.
Off the coast of northwest Australia there are four basins which include the Northern Carnarvon, Offshore Canning, Browse, and Bonaparte basins. The shelf has experienced many periods of continental rifting dating back to the Cambrian around 500mya (King, 2008). Rifting during the Cambrian period resulted from the separation of the Australian and Chinese continental plates. The basin in which our Snark 3D dataset falls is the Northern Carnarvon Basin. This basin was developed during late Jurassic to early Cretaceous rifting. The base of the Cretaceous is easily distinguished in our dataset as the horizon separating the synrift Jurassic deposits from the post-rift Cretaceous. There are four main tectonic evolution phases seen in the area: 1) during the break up of Gondwana a series of intracratonic basins formed, 2) Early Jurassic extension which created the four main depocenters including the Barrow sub-basin, 3) during the Middle Jurassic there was another phase of extension which resulted in seafloor spreading, 4) the fourth and final rifting phase was followed by a period of thermal sagging (King, 2008).
Figure 2. Overview of the dataset showing orientations of inlines and crosslines
The Snark survey consists of 550 inlines and 850 crosslines. The inlines run from the southwest to the northeas...
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...prospect the Hilltop prospect since the overall area of closure appears form an anticlinal hill as seen in figure 6. There were many DHIs in the area such as the one shown in figure 7 which highlights the differing impedances of shale overlying hydrocarbon bearing sandstone. These brightspots suggest a reservoir of gas which is the expected in this region.
Figure 6. Hilltop prospect time slice
Figure 7. Inline showing brightspot DHI overlaying channel feature
I predict the Hilltop prospect to be within a hydrocarbon bearing sandstone deposited during the Cretaceous period. The prospect is most likely one of gas and not oil. A plausible source rock for this reservoir is the Dingo Claystone which is known to generate both gas and oil in the area but mainly gas (Parry, 1988). A seal is created by the Muderong Shale member of the Cretaceous (West Barrow).
Marshak, S. (2009) Essentials of Geology, 3rd ed. New York: W.W. Norton & Company, ch. 11, p. 298-320.
The shelf-edge includes carbonate-to-clastic facies transition and tectonic uplift and erosion of the carbonates followed by deposition of the clastics. The Saint Peter Sandstone is a well-sorted, almost pure quartz arenite deposited during a major mid-Ordovician low stand. Clastics spread across an exposed carbonate platform by transportation. This is shown by the well-rounded, frosted texture of the quartz grains.
Lithologically the Kimmeridge Clay Formation can be subdivided into four units (Figure 2), despite of beds at the base of the succession are poorly exposed. However, in contrast, the units from mid-eudoxus Zone to the top of the formation that are well seen in the Formation. At the base of the formation until the eudoxus Zone, the strata are made up almost entirely of bioturbated shelly clays and in between beds, horizons of oil and bituminous are present. The upper part of the Eudoxus Zone until the upper Pectinatus Zone the composition is kerogen-rich mudstones and coccolith limestone.
The site visited on this day was informally known as the Bedrock Knob (NTS grid reference: 120 342). It is in an area where patches of limestone and exposed bedrock are common. The bedrock is part of the Preca...
Sedimentary rock from the older Silurian Period is further from the river banks (Geological map of Victoria, 1973). Mudstone, inter-bedded shale and greywacke depositions indicate the Maribyrnong River may have previously taken a different shape, and younger sediments have replaced the older sediments in more recent geological periods.
This area is known as the Permian Basin. Most of the oil is being produced from rocks
In the short story “The man who was almost a man” the main character, Dave, is a static character. There are many things that prevented him from changing, and there were many things that he could have done which he didn’t that would have allowed him to change. Dave was a 17 year old black male who wasn't taken seriously by anyone. All he wanted was to be treated like a man, so he thought one way to become a man was by getting a gun. But there were a lot more things he had to do, like face the forces preventing him from becoming a man, in order to become a man. Which he did not do; so therefore, Dave is classified as a static character.
Peabody Western Coal Company’s Kayenta coal mine is located on the northeastern portion of Black Mesa (a mountainous mesa on the Colorado Plateau in Northern Arizona). Elevations range from 6,600’ to 7,200’. Precipitation ranges from 7” to (“ per year with temperatures from -15oF to 100oF. The area is characterized by gentle to steep rolling hills dissected by deep valleys. The geology is dominated by scoreia, interbedded sandstones, and shale. Topsoil is very deep in the valle...
Culture and race have been a topic of discussion in America for centuries. Many American writers have taken on the undulling task of writing about culture and race in their novels or short stories. Richard Wright, who was an African American writer, wrote a short story entitled “The Man Who Was Almost a Man” which focused on the ideas of race and culture of African Americans in the south. Wright is known for his works that confirm stereotypes about black men held by white culture and in this short story he confirms these stereotypes like the dialect of African Americans in the south.
Krajick, Kevin. "Tracking Myth to Geological Reality." American Association for the Advancement of Science. 310.5749 (2005): 762. Print. .
The geological arrangement was largely influenced by the Western Interior Seaway, which swept through the continent millions of years ago. It was during this time when frequent alterations in climate caused the waters to surface and withdraw. The Dakota Sandstone deposited within the sedimentary profile of Mesa Verde is in large part due to these events.
Stephen .G,Malcolm.W, Guy H,(2014), GEOL20001 The Geology of Southeast Australia, School of Earth Sciences, University of Melbourne, pg. 23-25
The Austin Glen formation, which may be found at the Johnson Iorio Memorial Park, encompasses an abundance of clastic sedimentary rocks. More specifically, thin black shale and thick greywacke compose this formation. The thin black shale may be described as fine-grained and its color derives from lack of oxidation. This indicates the rock formed in deep ocean conditions. The shale layers are thin, and are approximately two to three centimeters wide. On the other hand, the greywacke shale, which is about fifteen centimeters, is thicker than the black shale. The greywacke is coarse grained, and a sandstone. The black shale and greywacke alternate between layers
...These rocks include indurated conglomerates, coarse-grain granites, and Arkosic and breciated granites. Furthermore, there are evidences to indicate that faulting took place in the area. Hydrothermal and epithermal action must have intruded the rocks in the Goldfield area forming small stringers of quartz. There are also evidences of sedimentary rocks such as sandstones, limestone and conglomerates found near Roosevelt Lake (Eppinga, 2006).
Recently in the Bismarck Sea there have been discoveries of rich minerals imbedded in the sea floor such as gold, lead, cobalt, silver, copper and zinc. We only have a short time left of gold, 16 years. There are several volcanoes located around the Bismarck Sea, which means there are many mineral deposits coming out from under the sea floor leaving deep pockets rich in coal and minerals. As the tectonic plates are moving they are activating volcanic eruptions, releasing minerals into the sea floor. With the tectonic plates continuously moving, the minerals and metal ores are shifting into the sea floor pockets causing the volcanoes to erupt coal and ores. The edge of the tectonic plates run directly under this site, subsequently releasing minerals from the magma below into the ocean floor.