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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. Universiti Teknologi Petronas. (Unpublished)

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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: Final Year Project
Academic Subject : Academic Department - Petroleum Geosciences - Petrophysics - Petrophysical data acquisition
Subject: Q Science > QE Geology
Divisions: Geoscience and Petroleum Engineering
Depositing User: Users 2053 not found.
Date Deposited: 30 Sep 2013 16:55
Last Modified: 25 Jan 2017 09:45
URI: http://utpedia.utp.edu.my/id/eprint/7541

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