Petrophysical characteristics study of carbonate Yamama reservoir in Ratawi oil field, south of Iraq

Abstract EN

Petrophysical properties of Yamama Formation in the Ratawi oil field have been studied.

These properties were derived from five wells which are (Rt-3, Rt-4, Rt-5, Rt-6, and Rt-7).

The wells are distributed at crest and flanks of Ratawi anticline structure.

The evaluation of reservoir units, as well as identifying productivity and demonstrating the direction of the improvement of reservoir specifications of the study area has been studied.

It was found that it can be assessed on three basic units reservoir (YA, YB1, and YB2) separated by two caped rock units (C1, and C2).

The Petrophysical analysis is based on using open well logs and core plug data to delineate the productive carbonate reservoir of Yamama Formation.

Petrophysical parameters such as porosity, water and hydrocarbon saturations, bulk water volume, moveable and residual oil saturations….etc, were computed and interpreted by using Petrel Software version year (2008).

Yamama rocks revealed that the reservoir YB2 unit has the better properties compared with two other units.

The majority of total porosity is primary porosity through the whole succession within the studied area.

The water saturation is affected significantly by increasing the volume of shale, which was often greater than 10 % within the period's bathymetric study of the wells.

The study of lithology and mineralogy also demonstrated through fees intersecting the (ØN-ρb) and (MN) cross plot the Yamama Formation consists of mainly limestone, argillaceous limestone, with essential mineral components are dominantly calcite with small amounts of dolomite.