Chemostratigraphy of the Unayzah Group, eastern Saudi Arabia

Based on a detailed comparison between the chemostratigraphic, lithostratigraphic and sedimentological data, specific chemozones can be linked to particular stratigraphic members within the Unayzah Group, though only confidently over cored intervals and in sections where members are clearly identified based on GR log trends. Once the associations between chemozone and member boundaries were established, it was then possible to use chemostratigraphy to define member boundaries in sections where this could not be achieved using other techniques. In addition to this, chemostratigraphy enabled correlative boundaries to be recognized within each member of the Unayzah Group, thus adding an additional level of resolution.