About This Item
- Full TextFull Text(subscription required)
- Pay-Per-View PurchasePay-Per-View
Purchase Options Explain
Share This Item
The AAPG/Datapages Combined Publications Database
AAPG Special Volumes
Abstract
from:
Chapter 15
Forward Modeling of Log Response in
Geopressured Formations Reveals Valuable
Insights to the Various Pore-Pressure Prediction Techniques
J. C. Rasmus
Schlumberger Product Center,
Sugar Land, Texas
ABSTRACT
A forward model for log response in a geopressured shale is developed. The state of compaction, lithology, water depths, salinity profiles, compaction coefficients, and clay characteristics are all user modifiable. Effective-stress relationships for geopressured shales that are currently widely practiced in the industry all assume constant log response is indicative of constant porosity and, therefore, constant effective stress. This modeling reveals that, although the porosity of a geopressured shale may remain constant for a constant effective stress, its log reponse does not. Therefore, this chapter illustrates that any effective-stress technique that uses the log response directly cannot be used to accurately compute the effective-stress state of the shale. Instead, the log response must first be characterized in terms of lithology, salinity profile, fluid moduli, water depth, and compaction coefficients. The modeling shows that this is much more critical for resistivity than velocity measurements.
View the First Page
A text abstract of this article is not available. The first page of the PDF appears below.
You may download the first page as a PDF.
Pay-Per-View Purchase Options
The article is available through a document delivery service. Explain these Purchase Options.
| Watermarked PDF Document: $14 | |
| Open PDF Document: $24 |