Molecular composition and organic petrographic characterization of Madbi source rocks from the Kharir Oilfield of the Masila Basin (Yemen): palaeoenvironmental and maturity interpretation

Organic geochemical characteristics of crude oils and oil-source rock correlation in the Sunah oilfield, Masila Region, Eastern Yemen

“…High Pr/ Ph (>3.0) indicates oxic conditions often associated with terrigenous organic matter input, while low values (<1.0) typify anoxic conditions, commonly hypersaline or carbonate environments (Peters et al, 1995(Peters et al, , 2005 and values between 1.0 and 3.0 suggest intermediate conditions (suboxic conditions) (Philp, 1985;Amane and Hideki, 1997). In the present study, pristane, occur in high relative concentrations, possessing pristane/phytane (Pr/Ph) ratios in the range of 1.55e2.05 suggest that the studied oils considered to be derived from source rock contain mixed organic facies and suboxic depositional conditions (Peters and Moldowan, 1993;Hakimi et al, 2012b). Furthermore, lower amounts of acyclic isoprenoids compared to n-alkanes (Fig.…”

“…For the analysis of biomarkers, the fragmentograms for steranes (m/z 217) and triterpanes (m/z 191) were recorded. Individual components were identified by comparison of their retention times and mass spectra with published data (Philp, 1985;Peters and Moldowan, 1993;Hakimi et al, 2011b;Hakimi et al, 2012b). Relative abundances of triterpanes and steranes were calculated by measuring peak heights in the m/z 191 and m/z 217 fragmentograms, respectively.…”

Oil-generation characteristics of Mesozoic syn-rift Madbi source rock in the Masila Basin, Eastern Yemen: New insights from kerogen pyrolysis and bulk kinetic modelling

“…The Kimmeridgian Madbi Formation is composed of porous lime grainstone to argillaceous lime mudstone . The lithofacies of this unit reflects openmarine environment Hakimi et al, 2012b) and can be divided into two members. The lower member, Madbi limestone, is composed mainly of porous limestone, shale layers, with a basal sand that forms a good reservoir in some oilfields of the Masila Basin.…”

Petrophysical analysis of early cretaceous Saar carbonates from Sharyoof oilfield in the Masila Basin, eastern Yemen, and their impact on reservoir properties and quality

“…During the late Jurassic commencing in the Kimmeridgian, syn-rift sediments of the Madbi Formation were deposited (Beydoun et al 1998). The lithofacies of this unit reflects open-marine environment (Beydoun et al 1998;Hakimi et al 2012) and can be divided into two members. The lower member, Madbi limestone, is composed mainly of porous limestone, shale layers, with a basal sand that forms a good reservoir in some oilfields of the Masila Basin.…”