Wave-to-Tide Facies Change in a Campanian Shoreline Complex, Chimney Rock Tongue, Wyoming–Utah, U.S.A.

2008 ◽  
pp. 265-291 ◽  
Author(s):  
PIRET PLINK-BJÖRKLUND
Keyword(s):  
Facies Change

Regional geochemical study of the Slave Point carbonates, Western Canada

1969 ◽  
Vol 6 (2) ◽  
pp. 247-268 ◽  
Author(s):  
E. M. Cameron
Keyword(s):  
Discriminant Function ◽  
Element Distribution ◽  
Western Canada ◽  
Prominent Feature ◽  
Reef Facies ◽  
Geochemical Study ◽  
Facies Change ◽  
Devonian Age ◽  
Multivariate Discriminant ◽  
Significant Chemical

A regional geochemical study of the Slave Point Formation within an area of 35 000 square miles (~90 000 km2) in the subsurface of western Canada was made to relate chemical variation to facies change. Core and cuttings samples were obtained from 90 wells drilled for petroleum. The Slave Point Formation is a relatively uniform and pure calcitic limestone of Middle Devonian age. A reef facies, dolomitized in places, is developed along the margin of the carbonate shelf with a shale basin. These dolomites produce natural gas from several fields.R-mode factor analysis methods have been used to help interpret the element distribution. There are slight, but significant, chemical differences between limestones occurring close to dolomites and gas discoveries and limestones distant from these features. The principal differences are a smaller content of magnesium and strontium held in solid solution in the calcites and less clay minerals and pyrite in limestones occurring close to gas discoveries. These differences, which are related to dissimilar conditions during deposition and diagenesis, are used to form a multivariate discriminant function separating the two groups of limestone. This discriminant function is used to classify the different limestone sections. Sphalerite (with galena and quartz), a prominent feature of the unit, occurs principally in the dolomites along the margin of the shale basin.

Logging Interpretation of S2 Formation of Moliqing Oilfield, Yitong Basin

2015 ◽  
Vol 1092-1093 ◽  
pp. 1406-1409
Author(s):  
Shao Jun Shi
Keyword(s):  
Electrical Property ◽  
Water Layer ◽  
Well Logging ◽  
Great Difficulty ◽  
Normal Faults ◽  
High Position ◽  
Hydrocarbon Reservoir ◽  
Facies Change ◽  
Deep Strata ◽  
Sand Bodies

Based on well logging data, this study has done research of well logging interpretation of Moliqing oilfield in Yitong basin. The Second member of Shuangyang formation is the main area. The main causes of complicated oil-water relationship are as follows: 1) rapid facies change produce diverse lithology distribution, and various lithology have different electrical property standards; 2) complex tectonic characteristics of study area bring about great difficulty in oil and water layer identification, especially a series of small normal faults in deep strata. According to those above, we built logging models in order to get essential parameters firstly. Then, several units of study area were divided. Different electrical property standards were established to solve the problem of recognition of water/oil layers. In total, more than 10,000 sand bodies of 149 wells were interpreted properly, and correct rate is higher than 90%. The conclusion is that oil layers distributed in high position of tectonics. Moliqing oilfield belongs to lithology-tectonic hydrocarbon reservoir.

Lower Oxfordian (Upper Jurassic) Sediments at Harrison Lake, British Columbia, and the Age of the 'Agassiz Orogeny'

1973 ◽  
Vol 10 (11) ◽  
pp. 1688-1692
Author(s):  
M. E. Brookfield
Keyword(s):  
British Columbia ◽  
Upper Jurassic ◽  
Lake Area ◽  
Facies Change

New finds of ammonites in the Harrison Lake area indicate marked facies change in the Lower Oxfordian, and together with some structural re-interpretation that the late Callovian 'Agassiz Orogeny' of Crickmay should be updated to the interval Upper Oxfordian – Tithonian.

Facies Change and Lithological Variation in the Permocarboniferous Formation of North-West Pahang and South-West Kelantan, Malaya

1947 ◽  
Vol 84 (5) ◽  
pp. 281-288 ◽  
Author(s):  
J. A. Richardson
Keyword(s):  
The West ◽  
North West ◽  
South West ◽  
Facies Change ◽  
Map Scale ◽  
Scale 8

Facies change and lithological variation traceable in the outcrop of the Permocarboniferous rocks exposed over portions of some 1,400 square miles of jungle country in north-west Pahang and south-west Kelantan are outlined in this paper. The area, some 70 miles N.–S. and 10 to 25 miles E.–W., is bounded by the 101° 45′ E. meridian in the west and by the Gunong Tahan and Gunong Benom Ranges in the east (Text-fig. 1A). The territory described lies mostly in Ulu Pahang of which a reconnaissance map, scale 8 miles to an inch, and a memoir have been published by Scrivenor (1911). Between 1937 and 1941 the 1,200 square miles lying between meridians 101° 45′E. and 102° 00′E. have been mapped partly on the scale of 1½ inches and partly 2 inches to a mile. The geology of the southernmost 300 square miles (Sheet 3 B/4, Raub) has been described by Willbourn (A.R., 1933–34) and the writer (1939); interim reports on the 300 miles (Sheets 2 N/16, Benta, and 2 O/13, Lipis) immediately north have been published by Service (A.R., 1938–1940), and of the northern 600 square miles (Sheets 2 N/12, Chegar Perah, and 2 N/8, Merapoh) by the writer (A.R., 1937–1940; 1946).

scholarly journals UNCONFINED GROUNDWATER FLOW PATTERN AND FACIES CHANGES AT WAY HUWI VILLAGE, SOUTH LAMPUNG

2020 ◽  
Vol 30 (1) ◽  
pp. 109
Author(s):  
Luhut Pardamean Siringoringo ◽  
Sandi Maulana
Keyword(s):  
Groundwater Flow ◽  
Flow Pattern ◽  
Water Table ◽  
Flow Patterns ◽  
Research Area ◽  
Piper Diagram ◽  
Change Pattern ◽  
Lower Elevation ◽  
Facies Change

Way Huwi Village is located in South Lampung, near the Institut Teknologi Sumatera (ITERA). The purposes of this research is to know the unconfined groundwater flow pattern and groundwater facies changes. We measured the depth of water table at nine dig wells, analyzed piper diagram for groundwater facies identification. Then, we integrated groundwater flow patterns and groundwater facies from each well to analyze groundwater facies change pattern in research area. The result indicated that the unconfined groundwater flows from SW to NE of research area, following higher (SW) to lower elevation (NE). There are six patterns of unconfined groundwater facies changes: from Facies Na-Cl to Facies Na-HCO3-Cl, Facies Na-HCO3-Cl to Facies Ca-Mg-HCO3, Facies Na-HCO3-Cl to Facies Na-Cl, Facies Na-HCO3-Cl to Facies Na-SO4-Cl, Facies Ca-Mg-HCO3 to Facies Na-SO4-Cl, and Facies Ca-Mg-HCO3 to Facies Na-HCO3-Cl. ABSTRAK - Pola aliran airtanah tidak tertekan dan perubahan fasiesnya di Desa Way Huwi, Lampung Selatan. Desa Way Huwi terletak di Lampung Selatan, di dekat Institut Teknologi Sumatera (ITERA). Tujuan dari penelitian ini adalah untuk mengetahui perubahan pola aliran airtanah dan fasies airtanah yang terjadi. Kami mengukur kedalaman muka airtanah pada sembilan sumur gali, menganalisis Diagram Piper untuk mengetahui fasies airtanah. Kemudian kami mengintegrasikan pola aliran airtanah dan fasies airtanah setiap sumur untuk mengetahui pola perubahan fasies air tanah. Hasil analisa menunjukkan bahwa airtanah tidak tertekan mengalir dari Barat Daya ke Timur Laut mengikuti ketinggian yang lebih tinggi (SW) ke ketinggian yang lebih rendah (NE). Ada enam pola perubahan fasies airtanah tidak tertekan: dari Facies Na-Cl ke Facies Na-HCO3-Cl, Facies Na-HCO3-Cl ke Facies Ca-Mg-HCO3, Facies Na-HCO3-Cl ke Facies Na-Cl, Facies Na -HCO3-Cl ke Facies Na-SO4-Cl, Facies Ca-Mg-HCO3 ke Facies Na-SO4-Cl, dan Facies Ca-Mg-HCO3 ke Facies Na-HCO3-Cl

scholarly journals The Danian-Selandian boundary at Svejstrup with remarks on the biostratigraphy of the boundary in western Denmark

1985 ◽  
Vol 33 ◽  
pp. 341-362
Author(s):  
E. Thomsen ◽  
C. Heilmann Clausen
Keyword(s):  
New Species ◽  
Calcareous Nannofossils ◽  
Two New Species ◽  
Different Ages ◽  
Facies Change

The Danian-Selandian boundary at Svejstrup is characterized by an abrupt facies change from a pure li­mestone to a terrigeneous marl. The top of the Danian limestone is an intensively burrowed abrasion sur­face. The Sel:indian deposits are initiated by a conglomerate of glauconitized and phosphatized limestone pebbles. Although the boundary at Svejstrup is very similar to the nearby section at Hvalklse, the time in­terval included in the hiatus at Svejstrup is greater than at Hvall0se. The coccoliths and dinoflagellates in­dicate different ages for the top of the Danian. It is also shown that the Danian sequences in the Harre and the Viborg 1 borings include strata younger than in any previously described Danian sections. At both of these localities a number of coccoliths and a dinoflagellate, Spinidinium densispinatum, hitherto only re­corded from the Selandian, occur in the Danian limestone. The top of the Danian at Harre and Viborg 1 is of upper NP4 or lower NP5 age. The calcareous nannofossils of the lower Selandian are completely domi­nated by reworked Cretaceous forms, whereas reworked dinoflagellates are extremely rare. This dif­ference is probably due to oxidation of the Cretaceous dinoflagellates during reworking. Two new species of dinoflagellates from the Paleocene are described.

Complexity in tight gas sand development—an example from Perth Basin, Western Australia

2011 ◽  
Vol 51 (2) ◽  
pp. 743
Author(s):  
Reza Rezaee
Keyword(s):  
Tight Gas ◽  
Gas Reservoirs ◽  
Field Development ◽  
Fine Grained ◽  
Well Completion ◽  
Well Stimulation ◽  
Tight Gas Sands ◽  
Facies Change ◽  
Key Issues ◽  
Reservoir Geometry

One of the key issues for tight gas reservoirs is about reservoir heterogeneities and its connectivity. Knowledge of reservoir geometry, orientation, and connectedness is vital for reservoir modelling, which is the essential tool for successful field development, well completion, and well stimulation strategies. Fluvial sediments are heterogeneous both vertically and laterally due to facies change and diagenetic processes. These make their field development difficult. In terms of sand geometry and connectivity, the first step to making the reservoir model in three directions is to determine the width of sandstone bodies in various directions. Fine-grained facies associated with fluvial deposits can compartmentalise reservoirs and can significantly complicate the development of such units, as well as make well stimulation and fracturing jobs unpredictable. In this paper, the above issues are studied for some fluvial tight gas sands of the Perth Basin. The aim is to discuss the best possible way to successfully plan well and well stimulation strategies.

scholarly journals Testing of Permian – Lower Triassic stratigraphic data in a half-graben/tilt-block system: evidence for the initial rifting phase in Antalya Nappes

2019 ◽  
Vol 56 (11) ◽  
pp. 1262-1283 ◽  
Author(s):  
Nazif Şahin ◽  
Demir Altiner
Keyword(s):  
Hanging Wall ◽  
Volcanic Rocks ◽  
Lower Triassic ◽  
Normal Faulting ◽  
Triassic Boundary ◽  
Block System ◽  
Basement Rocks ◽  
Half Graben ◽  
Facies Change ◽  
Permian Triassic Boundary

Testing of Middle Permian – Lower Triassic stratigraphic data from the Antalya Nappes in a half-graben/tilt-block system has revealed the presence of episodic rifting events separated by periods of tectonic quiescence. Following a period of uplift during the Permian (Late Artinskian to Roadian), the basement rocks have been activated by displacement faults and several depocenters in half-graben-like asymmetrical basins began to be filled with Roadian to Wordian continental clastic deposits intercalated with coal and marine rocks. The Early Capitanian time was a period of tectonic quiescence. The second event occurred in Middle to Late Capitanian times and produced basaltic volcanic rocks intercalated in the shallow marine fossiliferous carbonate successions. Following the Lopingian (Wuchiapingian and Changhsingian) and Permian–Triassic boundary interval representing a long tectonic quiescence, the last rifting episode started with an abrupt facies change in the late Griesbachian. Variegated shales, limestones, volcanics, talus breccia, and debris flow deposits were laid down in a half-graben/tilt-block system. As normal faulting has become active, the deposition continued on the subsiding hanging wall side. The stratigraphic gap increased in magnitude as the erosional truncation has incised deeply the footwall side. This initial rifting phase in the Antalya Nappes is prior to the onset of a stronger and more continuous rifting event that occurred in the Anisian–Carnian interval including a variety of deepwater clastic and carbonate deposits, radiolarites containing sometimes blocks and clasts derived from the basin margins, and volcanic rocks carrying intraoceanic setting character.

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