Hydrocarbon potentialities and reservoir characterization of lower cretaceous successions of Masila Oil field, Yemen

Abstract EN

Reservoir characterization, in general, is the process of integrating various qualities and quantities of data in a consistent manner to describe reservoir properties of interest at inter well locations.

For reservoirs, reservoir characterization is the process of integrating seismic data of various qualities and well data of limited quantities in a consistent manner to assign reservoir properties to a large extent of the reservoir using the seismic data.

Geostatistics is especially useful in the characterization of reservoirs because it is a technique that enables the propagation of reservoir properties in a manner that is statistically coherent and consistent.

It allows the application of concepts such as trends and variability of properties as well as subjective interpretation in the description of reservoir.

The basic inputs in the reservoir characterization process are the geological framework, well log data, seismic amplitude data, well test data and any other data which can be correlated to rock properties, such as porosity, permeability, saturation, thickness, and lithofacies. Evaluation of the hydrocarbons potentiality in the porous zones encountered in the Lower Cretaceous formations of Masila Oil Field, Yemen, is based on the data of eight wells.

Some points of interest will be considered in these formation evaluation processes such as the geological aspects, technique utilized and the presentation forms of the obtained petrophysical parameter values.

The basic logging data are in the form of spontaneous potential (SP), Caliper (CL), Deep (LLS, LLD), and Shallow (MSFL) resistivity logs, porosity tools (Density, Neutron and Sonic), litho-density (PEF) and Gamma-Ray (GR).

Different cross-plots such as Rho-PHIN, Rho-DTN and M-N were tested for lithology identification for the two formations in the studied wells.

Such formation evaluation and the presentation forms of the obtained petrophysical parameters have frequently proven that the formations have high hydrocarbon saturation in this area and containing many pay zones.