Mass-emplaced siliciclastic-volcaniclastic-carbonate sediments in Middle Miocene shelf-to-slope environments at Waikawau, northern Taranaki, and some implications for Taranaki Basin development

1990 ◽  
Vol 33 (4) ◽  
pp. 599-615 ◽  
Author(s):  
Scott D. Nodder ◽  
Campbell S. Nelson ◽  
Peter J. J. Kamp
Keyword(s):  
Middle Miocene ◽  
Carbonate Sediments ◽  
Basin Development

The Characteristic of Algal Reef Carbonate Sedimentary and Pore Structure in the Xisha Islands: Evidence from Halimeda

2014 ◽  
Vol 1065-1069 ◽  
pp. 3291-3294
Author(s):  
Xin Wei Zhao ◽  
Hui Zhi Hao
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
Energy Spectrum ◽  
Middle Miocene ◽  
Carbonate Sediments ◽  
Network Systems ◽  
Xisha Islands ◽  
Intercrystalline Pores ◽  
Algal Reef ◽  
Scanning Electron

Halimeda is an important reef-building green alga. Scanning electron microscopy (SEM) and energy spectrum tests on green and white Halimeda collected from Shidao Island in the Xisha Islands show that carbonate is predominantly deposited in the cortexes and medullas, especially in the aragonite raphides of them, as the case of calcium carbonate. These modern carbonate sediments are then compared with their ancient counterparts that are collected from Xichen-1 well in the Yongle Atoll, where a large number of Halimeda segments have been recognized in about 100-m-long late Miocene-middle Miocene whole-coring succession. In addition, there are developed great numbers of algal-frame holes, including secondary dissolved pores and intercrystalline pores in the medullas and in aragonites between cysts, which have formed particular network systems and pore throats.

scholarly journals On <i>Pseudotaberina malabarica</i> (Carter) <i>(Foraminiferida)</i>

1989 ◽  
Vol 8 (1) ◽  
pp. 113-129 ◽  
Author(s):  
F. T. Banner ◽  
J. Highton
Keyword(s):  
Type Species ◽  
Middle Miocene ◽  
Carbonate Sediments ◽  
Inner Shelf ◽  
History Of

Abstract. Pseudotaberina Eames, 1971, has as its (originally designated) type species Orbitolites malabarica Carter, 1853. The taxonomic and nomenclatural history of P. malabarica is given, and the diagnoses of both the genus and the species are corrected and emended, following re-examination of the type and other relevant specimens. A lectotype is selected and, with syntypes, strict topotypes and other specimens, is used for redescription of the species. P. malabarica is believed to characterise Early to Middle Miocene marine, inner shelf carbonate sediments of Tethys.

scholarly journals Application of Seismuc Attribute Analysis to Reserch the Distribution of Middle Miocene Coral Reef Carbonate in Block 04-3, Nam Con Son Basin

2020 ◽  
Vol 36 (4) ◽  
Author(s):  
Pham Bao Ngoc ◽  
Tran Trung Dong ◽  
Tran Nghi ◽  
Nguyen Thi Phuong Thao ◽  
Tran Thi Oanh ◽  
...  
Keyword(s):  
Middle Miocene ◽  
Maximum Amplitude ◽  
Well Log ◽  
Carbonate Sediments ◽  
High Concentration ◽  
Root Mean Square Amplitude ◽  
Seismic Properties ◽  
Amplitude Maximum ◽  
Attribute Analysis ◽  
Carbonate Formations

The seismic properties of Root Mean Square Amplitude, Maximum Amplitude, and Sum of Positive Amplitude most clearly reflect the distribution characteristics of middle Miocene carbonate sediments in ​​block 04-3, Nam Con Son basin. Middle Miocene carbonate is commonly distributed on both reflection surfaces of  P1 and P2. Within each reflective surface, carbonate sediments are concentrated around the uplifting zones, such as structures of Thien Ung - Mang Cau, Dai Hung and Bo Cau. These are completely consistent with the results of the interpretation of well-log data of Vietsovpetro, VSP [1]. The wells C-2X and C-4X  located at the edge of the uplifting zone should have the thickest carbonates. According to the results of amplitude attribute analysis, these wells are distributed in the high concentration area of carbonate formations. Meanwhile well C-1X  and well C-3X, which are near the top of the uplifting zone and further away from the uplifting structure have thin carbonate set and belongs to a low carbonate density area.

scholarly journals Depositional environment, organic matter characterization and hydrocarbon potential of Middle Miocene sediments from northeastern Bulgaria (Varna-Balchik Depression)

2015 ◽  
Vol 66 (5) ◽  
pp. 409-426 ◽  
Author(s):  
Alexander Zdravkov ◽  
Achim Bechtel ◽  
Stjepan Ćorić ◽  
Reinhard F. Sachsenhofer
Keyword(s):  
Organic Matter ◽  
Middle Miocene ◽  
Depositional Environments ◽  
Hydrocarbon Potential ◽  
Carbonate Sediments ◽  
Terrestrial Organic Matter ◽  
Anoxic Environments ◽  
Moesian Platform ◽  
Rock Eval ◽  
Resistivity Log

Abstract The depositional environments and hydrocarbon potential of the siliciclastic, clayey and carbonate sediments from the Middle Miocene succession in the Varna-Balchik Depression, located in the south-eastern parts of the Moesian Platform, were studied using core and outcrop samples. Based on the lithology and resistivity log the succession is subdivided from base to top into five units. Siliciclastic sedimentation prevailed in the lower parts of units I and II, whereas their upper parts are dominated by carbonate rocks. Unit III is represented by laminated clays and biodetritic limestone. Units IV and V are represented by aragonitic sediments and biomicritic limestones, correlated with the Upper Miocene Topola and Karvuna Formations, respectively. Biogenic silica in the form of diatom frustules and sponge spicules correlates subunit IIa and unit III to the lower and upper parts of the Middle Miocene Euxinograd Formation. Both (sub)units contain organic carbon contents in the order of 1 to 2 wt. % (median: 0.8 for subunit IIa; 1.3 for unit III), locally up to 4 wt. %. Based on Hydrogen Index values (HI) and alkane distribution pattern, the kerogen is mainly type II in subunit IIa (average HI= 324 mg HC/g TOC) and type III in unit III (average HI ~200 mg HC/g TOC). TOC and Rock Eval data show that subunit IIa holds a fair (to good) hydrocarbon generative potential for oil, whereas the upper 5 m of unit III holds a good (to fair) potential with the possibility to generate gas and minor oil. The rocks of both units are immature in the study area. Generally low sulphur contents are probably due to deposition in environments with reduced salinity. Normal marine conditions are suggested for unit III. Biomarker composition is typical for mixed marine and terrestrial organic matter and suggests deposition in dysoxic to anoxic environments.

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