High-amplitude changes in sedimentary δ 13 C characterize the Cretaceous system and have been proven useful for supra-regional chemostratigraphic correlation. In Cretaceous, these perturbations indicate large shifts between global carbon reservoirs that are usually caused by volcanic activity of igneous provinces, widespread deposition thick organic carbon-rich sequences and/or orbital paramete...

The stable carbon isotopic compositions of carbonate sediments (?13Ccarb) have been widely used to reconstruct the global cycle and as a stratigraphic correlation tool. This work investigates ?13Ccarb record marine organic-rich, mixed siliciclastic?carbonate mudstones accumulated from Tithonian (late Jurassic) early Valanginian (early Cretaceous) in retro-arc basin connected Proto-Pacific Ocean...

Atolls are faithful recorders helping us understand eustatic variations, the evolution of carbonate production through time, and changes in magmatic hotspots activity. Several early Cretaceous Mid-Pacific atolls were previously investigated ocean drilling, but due to low quality vintage seismic data available, few spatial constraints exist on their stratigraphic large-scale diagenesis. Here, we...

The Yamama Formation represents a part of the Late Berriasian-Aptian sequence, deposited during Early Cretaceous period within main shallow marine depositional environment. studied area covers three oil fields; Sindbad field, Halfaya and Ad'daimah located in southeastern Iraq. Six major microfacies were recognized succession represented by to determine recognize paleoenvironments. These are; Pe...

Integrated organic petrographic and geochemical analyses were made on organic-rich marine carbonate mixed clastic-carbonate rocks of Middle–Late Jurassic Early Cretaceous age from the Shushan Basin, Egypt to evaluate their hydrocarbon potential. Analyses allowed identification depositional settings, paleoclimate, three third order genetic stratigraphic sequences (SQ) with deposits assigned high...

The Meillon (Callovo-Oxfordian) and Mano (Tithonian) Formations are dolomitized carbonate reservoirs that actively produce oil gas (Aquitaine Basin, France). In this study, the dolomitization conditions of their counterparts exhumed in northwestern Pyrenees detailed using a combination field observations, petrography, fluid inclusion microthermometry, elemental isotopic geochemistry, U–Pb geoch...

The oilfield water in the Upper Sandstone Member of the Zubair reservoir (Barriemian-Hauterivian) at Rumaila North Oil Field was investigated for the interpretation of salinity and geochemical evolution of brine compositions. The interaction of the oilfield water with reservoir rock resulted in a brine water derived from the marine water origin of partial mixing with meteoric water similar to t...