Sabatayn basin is one of the two mature basins producing oil and gas in Yemen. Due to the recent decline in oil
production, the exploration activities have been extensively concentrated mainly on these two basins (Sabatayn
and Sayun-Masilah). So, this present study has been conducted to evaluate the exploration potential of the
remaining trap areas within these mature basins. Fracture basement of reservoir becomes very attractive
exploration target in Yemen recently, after the recent discoveries of basement fracture oil fields. As the
evaluation of basement traps needs time and fund, to reduce the same, this research study uses a new technique
which was devised with the help of Geoinformatics by analyzing the surface and subsurface lineaments
effectively. In this study, a satellite image Enhanced Thematic Mapper (ETM+7) based analysis was conducted
for extracting surface lineaments, and for the subsurface lineaments, the basement lineaments were extracted
from seismic, magnetic and gravity data. An orientation analysis of these surface and subsurface linear features
was performed to detect the basic structural grains of the study area. The correlation between these structural
grains and subsurface oil and gas traps was performed to understand the connectivity to the reservoirs. This
paper discusses in detail about the same and the importance of using surface and subsurface lineament analysis
for delineating hydrocarbon reservoirs in the study area.

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GIS Provides spatial and analytical support to assess multicriteria (MCE) methods, which are used to combine data to show areas best fulfilling specific criteria. Petroleum explorations would benefit from an MCE method that is spatial, is flexible for combining heterogeneous data, considers the interpretive nature of the data, is geologically applicable, and is applicable for frontier areas or where little information exists regarding probabilities of the presence of petroleum .This study proposes a GIS-based MCE method for petroleum exploration based on fuzzy logic, which fulfills the previously stated requirements using 9 subcriteria combined to produce a favorability map of potential exploration areas. A case study applied to Sayun Almasilah Basin East Yemen. We conclude that the method can be applied in an exploration setting and, as such, is applicable for other regions of the world.

Exploration of hydrocarbon resources is a highly complicated and costly process where different geological, geochemical and geophysical element are improved then combined together. It is highly important how to plan the seismic data acquisition survey and locate the exploratory wells since inaccurate or imprecise locations lead to waste of time and money during the operation. The goal of this study is to locate high-potentially oil and gas province in Ayad Area to reduce both time and costs in exploration and development processes. In this observe, 8 maps were developed using GIS functions for factors including: basement structure (BDM), Bouguer gravity anomalies (GAM), pre rift isopach map (PRIM), syn rift isopach map (SRIM), salt depth map (SDM),subsurface faults system(SFS), Lower pre rift Isopach map (LPRI),and Upper pre rift Isopach map (UPRI). To model and to integrate maps, this study employed Weighted Liner Composition(WLC) and Analytic Hierarchy Process (AHP) methods to locate high-potential zones of hydrocarbon prospects. the hydrocarbon potential map was classified to five classes from very low to very high potential. The classes of hydrocarbon potential map were checked against the distribution of the exploration wells and oil fields in Ayad area. The final favorable potential map suggested new promising areas for hydrocarbon accumulations which were found in agreement to the validated ground truth data.

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