SEISMIC ANALYSIS OF THE TRANSGRESSIVE SYSTEMS TRACTS (TSTS) OF THE NIGER DELTA

Earth Science Malaysia

article

Okoli Emeka Austin¹  Agbasi Okechukwu Ebuka²  Akaolisa C. C. Zanders¹  Inyang Namdie Joseph³ 

[1] Department of Geology, Federal University Technology;Department of Physics, Michael Okpara University of Agriculture;Department of Physics, University of Uyo

关键词: Reflectivity;    Seismic Analysis;    Transgressive Systems Tract;    Maximum Flooding Surfaces;   

DOI  :  10.26480/esmy.02.2018.16.19

学科分类：地球科学(综合)

来源: Zibeline International

【 摘 要 】

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.

【 授权许可】

CC BY