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Basra is both a state capital and a state of Iraq. The largest field in the state is the Rumaila field, a huge field as documented in the second reference.

Not only is there variation of properties from field to field, but also well to well within the same field. Therefore, the oil is divided into Basra light, medium and heavy. A Basra blend is about 31.5 degrees API. The sulfur content is 1.95%. I couldn't find more specifications on the internet.

Variations will also occur over time, as the less desirable heavy crude is usually produced later in the life of the fields.

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