Discrete Modeling of Fluid Flow in Fractured Sedimentary Rocks

2009 ◽  
Author(s):  
Wu Wei ◽  
Li Yong ◽  
Ma Guowei
Keyword(s):  
Fluid Flow ◽  
Sedimentary Rocks ◽  
Discrete Modeling

scholarly journals The Relationship between Fluid Flow, Structures, and Depositional Architecture in Sedimentary Rocks: An Example-Based Overview

Geofluids ◽  
2020 ◽  
Vol 2020 ◽  
pp. 1-19 ◽  
Author(s):  
Vilde Dimmen ◽  
Atle Rotevatn ◽  
Casey W. Nixon
Keyword(s):  
Fluid Flow ◽  
Sedimentary Rocks ◽  
Structure Type ◽  
Mineral Dissolution ◽  
Rock Properties ◽  
Hydrocarbon Migration ◽  
Geological Processes ◽  
Wide Range ◽  
Depositional Architecture ◽  
The Relationship

Fluid flow in the subsurface is fundamental in a variety of geological processes including volcanism, metamorphism, and mineral dissolution and precipitation. It is also of economic and societal significance given its relevance, for example, within groundwater and contaminant transport, hydrocarbon migration, and precipitation of ore-forming minerals. In this example-based overview, we use the distribution of iron oxide precipitates as a proxy for palaeofluid flow to investigate the relationship between fluid flow, geological structures, and depositional architecture in sedimentary rocks. We analyse and discuss a number of outcrop examples from sandstones and carbonate rocks in New Zealand, Malta, and Utah (USA), showing controls on fluid flow ranging from simple geological heterogeneities to more complex networks of structures. Based on our observations and review of a wide range of the published literature, we conclude that flow within structures and networks is primarily controlled by structure type (e.g., joint and deformation band), geometry (e.g., length and orientation), connectivity (i.e., number of connections in a network), kinematics (e.g., dilation and compaction), and interactions (e.g., relays and intersections) within the network. Additionally, host rock properties and depositional architecture represent important controls on flow and may interfere to create hybrid networks, which are networks of combined structural and stratal conduits for flow.

Paleomagnetism of the mid-Cretaceous gem-bearing pegmatite dikes of San Diego County, California, USA

2009 ◽  
Vol 46 (9) ◽  
pp. 675-687 ◽  
Author(s):  
D. T.A. Symons ◽  
T. E. Smith ◽  
K. Kawasaki ◽  
M. J. Walawender
Keyword(s):  
Fluid Flow ◽  
Gulf Of California ◽  
Remanent Magnetization ◽  
Sedimentary Rocks ◽  
Economic Importance ◽  
San Diego County ◽  
Magnetization Direction ◽  
Western Zone ◽  
Stable Characteristic ◽  
Tectonic Boundary

Pegmatite dikes in the Peninsular Ranges batholith of southwestern California have produced spectacular crystals of semiprecious and precious minerals for over a century. Aside from their economic importance, these dikes straddle a major tectonic boundary and were used to test hypotheses related to the timing and development of this composite batholith. Paleomagnetic analysis of 252 specimens from 20 sites (12 and 8 sites in the western and eastern zones of the batholith, respectively, from 11 mines in five dike districts) isolated a stable characteristic remanent magnetization direction at 19 sites. The site mean directions for the western and eastern zones are statistically indistinguishable at 95% confidence, supporting petrologic and geochemical arguments that the dikes of the two zones are coeval and cogenetic. After correction for the Neogene opening of the Gulf of California, the paleopole for all 19 site mean directions is indistinguishable from the 94 Ma reference paleopole for North America and supports hypotheses that (1) the dikes are genetically related to intrusion of the La Posta-type plutons; (2) the batholith was already assembled beside the northwestern coastline of Mexico at 94 Ma; (3) ENE-side-up tilting of fault blocks in the batholith’s western zone ended by ∼94 Ma; and (4) the far-sided and clockwise-rotated discordant paleopoles found commonly in Late Cretaceous and younger sedimentary rocks of the batholith’s region are mostly the result of inclination-flattening of the remanence and (or) remagnetization by fluid flow, creating a secondary remanence, excluding Neogene tectonic rotations.

scholarly journals Combined positron emission tomography and computed tomography to visualize and quantify fluid flow in sedimentary rocks

2015 ◽  
Vol 51 (9) ◽  
pp. 7811-7819 ◽  
Author(s):  
M. A. Fernø ◽  
J. Gauteplass ◽  
L. P. Hauge ◽  
G. E. Abell ◽  
T. C. H. Adamsen ◽  
...  
Keyword(s):  
Computed Tomography ◽  
Positron Emission Tomography ◽  
Fluid Flow ◽  
Sedimentary Rocks ◽  
Emission Tomography ◽  
Positron Emission

HISTORY AND MECHANISMS OF ACTIVE FLUID FLOW THROUGH LOW-PERMEABILITY SEDIMENTARY ROCKS

2020 ◽  
Author(s):  
Robert H. Goldstein ◽  
◽  
Sahar Mohammadi ◽  
Andrew Michael Hollenbach
Keyword(s):  
Fluid Flow ◽  
Sedimentary Rocks ◽  
Low Permeability ◽  
Active Fluid ◽  
Flow Through

Chapter 26: Geology of the Hishikari Gold Deposit, Kagoshima, Japan

2020 ◽  
pp. 545-558
Author(s):  
Takayuki Seto ◽  
Yu Yamato ◽  
Ryota Sekine ◽  
Eiji Izawa
Keyword(s):  
Fluid Flow ◽  
Gold Deposit ◽  
Sedimentary Rocks ◽  
Alteration Zone ◽  
Volcanic Area ◽  
Mineral Zone ◽  
Temperature Controlled ◽  
Hydrothermal Alteration Zones ◽  
Low Sulfidation ◽  
Ore Grade

Abstract The bonanza-grade, low-sulfidation epithermal Hishikari gold deposit is located in the Plio-Pleistocene volcanic area of southern Kyushu, Japan. The concealed veins were discovered in 1981 and the mine has since produced 5.462 million metric tons (Mt) of ore averaging 44.3 g/t Au (242 t Au) from 1985 to the end of 2018, at which time reserves were 7.98 Mt at 20.9 g/t Au. The Hishikari deposit consists of the Honko, Sanjin, and Yamada ore zones, which occur in a NE-trending area 2.8 km long and 1.0 km wide. The veins are hosted by basement sedimentary rocks of the Cretaceous Shimanto Supergroup and by overlying Hishikari Lower Andesites of Pleistocene age. Sinter occurs about 100 m above the Yamada ore zone. Temperature-controlled hydrothermal alteration zones occupy an area of >5 km long and 2 km wide. The Honko and Sanjin veins occur within a chlorite-illite alteration zone (paleotemperature >230°C), whereas the Yamada veins occur within an interstratified clay mineral zone (150°–230°C). The marginal alteration comprises quartz-smectite (100°–150°C) and cristobalite-smectite (<100°C) zones. Ore-grade veins are located between –60- and 120-m elev, with the paleowater table over the Honko-Sanjim veins at ~300-m elev. Overall, the Ag/Au wt ratio is about 0.6. Vein-forming minerals consist of quartz, adularia, and clay minerals plus truscottite, with electrum and minor pyrite, chalcopyrite, naumannite, galena, and sphalerite. The major veins formed from repeated episodes of boiling and strong fluid flow inferred from bands of quartz, adularia, and smectite with bladed quartz, columnar adularia, and truscottite.

Implication of fractal geometry for fluid flow properties of sedimentary rocks

1992 ◽  
Vol 8 (2) ◽  
pp. 133-147 ◽  
Author(s):  
J. Muller ◽  
J. L. McCauley
Keyword(s):  
Fluid Flow ◽  
Fractal Geometry ◽  
Sedimentary Rocks ◽  
Flow Properties

Geochemical composition of sedimentary rocks and imprint of hydrothermal fluid flow at the Variscan front an example from the RWTH-1 well (Germany)

2008 ◽  
Vol 159 (4) ◽  
pp. 623-640 ◽  
Author(s):  
Sven Sindern ◽  
Jens Warnsloh ◽  
Ute Martin Trautwein-Bruns ◽  
Maria Chatziliadou ◽  
Stephan Yüceer Becker ◽  
...  
Keyword(s):  
Fluid Flow ◽  
Hydrothermal Fluid ◽  
Sedimentary Rocks ◽  
Geochemical Composition
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