SEISMIC ANALYSIS OF THE TRANSGRESSIVE SYSTEMS TRACTS (TSTS) OF THE NIGER DELTA
One way of identifying our MFSs is to look out for shale tops of high acoustic properties within a shale interval that corresponds to the lowest resistivity values and widest separation between neutron and density values. The TSTs culminate to a MFS as it comprises the deposits accumulated from th...
| Main Authors: | , , , |
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| Format: | Article |
| Language: | English |
| Published: |
Zibeline International
2018-01-01
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| Series: | Earth Science Malaysia |
| Subjects: | |
| Online Access: | https://earthsciencesmalaysia.com/archives/ESMY/2esmy2018/2esmy2018-16-19.pdf |
| Summary: | One way of identifying our MFSs is to look out for shale tops of high acoustic properties within a shale interval that
corresponds to the lowest resistivity values and widest separation between neutron and density values. The TSTs
culminate to a MFS as it comprises the deposits accumulated from the onset of coastal transgression until the time of
maximum transgression of the coast, just prior to renewed regression (SepmStrata, 20). The seismic character of the
shales within these TSTs could vary factoring the effect of depth trends, hence a need to understand the trend with
increasing depth and thereby increased compaction. From generated synthetic, using the seismic responses at
interfaces within the lithologies cut across by one of our HP well in the Central Swamp depobelt, a study integrating
Reflectivity Pattern Analysis (RPA) and Sequence Stratigraphic analysis was carried out to understand the behavior
of our shales within the TSTs. Key bounding surfaces which subdivide the strata into contemporaneously deposited
sediment packages were identified from well log responses from a complete suite of logs which included Gamma Ray,
Resistivity and Porosity logs. It was observed that shales in the TSTs were of higher acoustic properties compared to
sales in the HSTs. |
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| ISSN: | 2521-5035 2521-5043 |