March-April 2000
Volume 1 No. 2

QPSET: A Program for Computing Reservoir Parameters in Marginal Hydrocarbon Zones.  Application to the Rudeis Section, Gulf of Suez Basin, Egypt.

E. M. Abdelraman, M. H. Kamel, and M. A. Bayoumi
 

ABSTRACT:  This paper describes a well-based analysis program, written in the C programming language, called “Quantitative Petrophysical and Seismic Evaluation Technique” (QPSET).  The program is designed to accomplish the evaluation of reservoir parameters in shaly-sand sedimentary sections in marginal hydrocarbon zones. The program flow is designed to complete an analysis in a single pass and uses two modified approaches for the evaluation of water saturation and acoustic impedance. Output values are stored in ASCII format and are therefore available for plotting in any graphic software package. Either the user selects the precise analysis algorithms employed, or they may be restricted by the data available.
This paper reports results obtained using the program on data from seven wells located in the northern portion of the Gulf of Suez Rift Basin, spanning the Lower Middle Miocene Rudeis sedimentary section. (Rudeis thickness ranges from 500 ft. to 5000 ft. within the basin.) The program has successfully characterized the essential features of the Rudeis and permits some speculation as to the depositional environment for the sediments and the tectonic setting of the basin at the present day. In this latter regard, it is stressed that other information is required before adequate interpretations can be established.

Permeability Prediction in Poorly Consolidated Siliciclastics Based on Porosity and Clay Volume Logs

Lev Vernik, Vastar Resources
 

ABSTRACT:  Routine well log calculations of porosity and clay volume are utilized in a new permeability model for poorly consolidated sand/shale formations. The model is based on the power law porosity and exponential clay volume controls on permeability. The major underlying assumption in the model is that the clay volume is strongly correlated to the mean grain/pore size of the rock, as is actually observed in many poorly consolidated shallow marine and fluvial-deltaic sequences. This feature makes this model explicitly independent of either grain size or specific surface area and permits accurate permeability predictions consistent with core measurements. Even though the model is empirically based, it has a physical meaning and petrographic significance. Therefore it is not formation specific and can be adapted to compute continuous log permeability wherever accurately calculated porosity and clay volume logs are available. The model is designed for and has been successfully tested in some poorly consolidated sand/shale sequences characterized by little or no chemical diagenesis (cementation).