Frontiers in Marine Science,
Journal Year:
2025,
Volume and Issue:
11
Published: Jan. 17, 2025
Introduction
Milankovitch
theory
has
extensive
application
in
sequence
stratigraphy
and
the
establishment
of
time
scales.
However,
it
is
rarely
applied
to
shallow
strata
rich
hydrates.
Cyclostratigraphic
analysis
Quaternary
unconsolidated
sediments
can
help
identify
climate
sea
level
changes
that
correspond
orbital
cycles
improve
our
understanding
dynamic
evolution
Methods
Using
natural
gamma-ray
log
data
from
deepwater
area
well
W01
Qiongdongnan
Basin,
cycle
was
conducted
primary
astronomical
period
W01.
Anchored
existing
AMS-14
C
age
bivalve
shell
as
reference
point,
an
scale
established.
Simultaneously,
through
analyses
major
trace
elements
total
organic
carbon
content
(TOC)
sediment
samples,
how
influenced
past
environmental
conditions.
Furthermore,
employing
sedimentary
noise
models,
relative
change
reconstructed.
Results
Sedimentary
27.34
m
6.73
were
identified
GR
W01,
corresponding
periods
405
kyr
100
eccentricity,
with
a
duration
approximately
2.5
Myr.
The
spectral
paleoenvironmental
proxies
reveals
27
m,
while
model
reconstructs
fluctuating
rise
change.
An
obliquity
modulation
170
TOC
data,
which
may
reflect
combined
effects
other
parameters.
Discussion
Spectral
indicators
showed
long
eccentricity
had
varying
degrees
influence
on
paleoclimate,
paleosalinity,
paleoredox
Additionally,
1.2
Myr
significant
factor
influencing
during
early
Pleistocene
South
China
Sea
(SCS).
In
addition,
confirmed
dominant
glacial-interglacial
SCS
0.6
Ma
present
period.
Synthesize
above
analysis,
phases
low
amplitude
or
minimum
value
cycle,
are
associated
lower
temperature,
conditions
become
more
conducive
hydrate
accumulation.
Processes,
Journal Year:
2025,
Volume and Issue:
13(2), P. 360 - 360
Published: Jan. 28, 2025
This
study
aims
to
solve
the
problem
of
recovery
efficiency
natural
gas
hydrate
being
affected
by
a
large
amount
mud
and
sand
in
solid
fluidization
mining
hydrate.
Therefore,
new
method
for
separation
situ
sediment
spiral-swirling
downhole
is
proposed,
corresponding
numerical
simulation
model
established
realize
analysis
verification
key
flow
field
parameters
such
as
velocity,
pressure,
sediment,
phase
distribution.
The
results
show
that
velocity
mixed
slurry
presents
an
‘M’-shaped
symmetrical
distribution,
near
wall
separator
can
obtain
larger
which
beneficial
mud–sand
static
pressure
shows
axisymmetric
distribution
decreases
first
then
increases,
indicating
increases
with
increase
radial
position,
closer
wall,
greater
slurry.
Near
separator,
volume
fraction
reaches
maximum.
In
contrast,
minimum,
confirms
effect
sediments
be
realized,
thereby
improving
exploitation
designed
spiral
cyclone
coupling
provides
solution
solving
removal
exploitation.
Frontiers in Earth Science,
Journal Year:
2025,
Volume and Issue:
13
Published: March 18, 2025
Natural
gas
hydrates,
solid
crystalline
structures
formed
by
the
combination
of
natural
and
water
molecules
under
high-pressure
low-temperature
conditions,
are
regarded
as
a
promising
clean
energy
source.
Electrical
resistivity
serves
fundamental
petrophysical
parameter
for
quantifying
hydrate
saturation
in
sand-dominated
sediments,
with
its
sensitivity
to
pore-filling
morphology
distribution
patterns.
An
integrated
experimental
system
combining
in-situ
CT
scanning
measurement
was
developed
investigate
tetrahydrofuran
(THF)
formation
dynamics
quartz
sand
sediments.
We
prepared
four
distinct
THF
solutions
represent
different
regimes,
lowered
temperature
within
reactor
containing
grains,
continuously
monitored
electrical
sediments
during
formation.
Additionally,
used
acquire
three-dimensional
grayscale
images
at
varying
saturation.
The
data
revealed
pronounced
deviations
from
classical
Archie’s
equation,
demonstrating
complex
behavior
between
index
scan
demonstrate
salting-out
effect
process.
precipitation
dissolved
salts
significantly
increased
salinity
water,
resulting
corresponding
decrease
due
enhanced
ionic
conductivity.
phenomenon
impedes
kinetics,
causing
substantial
divergence
measured
thermodynamic
equilibrium
prediction.
When
effects
salt
phenomena
properly
accounted
for,
index-water
relationship
exhibits
excellent
agreement
law,
enabling
reliable
estimation
quartz-dominated
Journal of Marine Science and Engineering,
Journal Year:
2023,
Volume and Issue:
11(11), P. 2069 - 2069
Published: Oct. 30, 2023
This
research
explores
the
geomechanical
challenges
associated
with
gas
hydrate
extraction
in
submarine
slope
zones,
a
setting
posing
high
risk
of
significant
geological
calamities.
We
investigate
and
wellbore
deformations
driven
by
decomposition
within
subsea
environment.
Utilizing
Abaqus,
fluid-solid-thermal
multi-field
coupling
model
for
reservoirs
was
created.
Hydrate
during
drilling
is
minimal,
resulting
minor
formation
deformation
near
wellbore.
However,
year
production
caused
maximum
displacement
up
to
7
m
formation,
highlighting
landslides.
indicates
need
meticulous
surveillance
subsidence
wellhead
equipment
displacement.
In
aftermath
hydrate-induced
landslide,
both
layer
overlying
strata
descend
together,
inflicting
considerable
damage
on
Our
study
presents
holistic
examination
interplay
between
environmental
geomechanics
risks
engineering
structure
instability
stability
development,
providing
crucial
insights
enhancing
safety
measures
production,
ensuring
stability.
