Climate Stratigraphy In Subsurface: Application To Clastic Reservoirs Of Resak Field

MOHAMAD ROSLI, UMMI FARAH (2008) Climate Stratigraphy In Subsurface: Application To Clastic Reservoirs Of Resak Field. Masters thesis, UNSPECIFIED.

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Abstract

This study was carried out to test and evaluate the applicability of climate
stratigraphy, in improving and refining subsurface correlation of Miocene reservoirs
(Groups H, I and J) of the Resak Field, Malay Basin, Malaysia. Climate stratigraphy is a
newly emerging stratigraphy concept that uses cyclicity in climate. It is defined as a
stratigraphic succession of climatic changes through geologic time. This research focuses
on an entirely new methodology for the stratigraphic interpretation based on spectral
(frequency) analysis of facies-sensitive wireline-logs using CycloLog® methods and
climate stratigraphy approach.
Climate stratigraphy depends on the importance of orbitally- forced climate
change as a major control on vertical lithofacies succession. Orbitally driven
(Milankovitch) climate change takes place at timescales of 104-105 years. It is driven by
changes of insolation, the flux of solar energy at the Earth's surface and its distribution
with latitude. Climate is a major influence on every stage in the cycle of weathering,
erosion, transport and deposition of sediments.
The Cyclolog® software was used in this study. The software uses spectral
methods to analyze the facies sensitive wireline log which in this case, the Gamma Ray
log was used. Prediction error filter was computed to generate the PEFA (prediction error
filter analysis). When numerically integrated, the PEFA curve yields a still more valuable
curve - the INPEF A (Integrated PEF A) curve. This curve reveals trends and other
patterns that are not generally apparent from the original log data. From this INPEFA
curve, key bounding surfaces were identified for the subdivision of geological
succession. New terminologies and nomenclatures were used for climate stratigraphic
analysis. Integrating data such as seismic, sequence stratigraphy, cores and
biostratigraphic have proven its importance in guiding and constraining the climate
stratigraphic analysis and interpretation of well data.
Result for the semi-regional scale stratigraphy framework of the Resak Field
shows that all lower order major negative bounding surfaces (NBS) of the wells' climate
stratigraphic framework coincided with or marked quite near to the established seismic
horizons. This is observed for StratPac Architecture 1000 and 2000 which are also known
as Groups J and I respectively. However, for StratPac Architecture 3000 which is known
as Group H, the top of this package was marked shallower than the established seismic
top. The top of this package however coincides with the top of the biostratigraphic top of
Group H where it is indicated by acme of nannofossils NN5.
For reservoir scale stratigraphy framework, comparison was conducted between
the bounding surfaces of both climate stratigraphy and sequence stratigraphy. Results
show that the major NBS coincides with the Sequence Boundary (SB) and the positive
bounding surface (PBS) coincides with Flooding Surfaces (FS). Each of the sequence or
systems tract can be further subdivided and refined into a higher order sequences known
as StratPac Sets (5th to 6th order) using INPEFA curves and verified by the cores.
Since the climate stratigraphy concept is fairly new and has yet to be fully
understood and evaluated, more studies are needed to establish more detailed relationship
between the key surfaces of seismic and sequence stratigraphy and those revealed by
INPEF A. Studies should also be carried out in other fields to evaluate and validate the
applicability of the tool and climate stratigraphy concept itself.

Item Type: Thesis (Masters)
Subjects: Q Science > QE Geology
Departments / MOR / COE: Geoscience and Petroleum Engineering
Depositing User: Users 2053 not found.
Date Deposited: 30 Sep 2013 16:55
Last Modified: 15 May 2023 03:56
URI: http://utpedia.utp.edu.my/id/eprint/7541

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