The Kern County Oil Fields are some of the most productive in California. Over time the depletion of the reserves became a real worry and concern to those that produce oil. Determining the rate of depletion, reserves left and how best to reclaim those remaining deposits was of upmost value. Tonight’s talk is how to determine those factors and making good decisions based on those 3D models over time.
Jon Allen Presenter
Improved Reservoir Characterization at Kern River Field, California
New Insights into an Old Field Using 4D Saturation Modeling
The Kern River Field is one of the largest fields in the state of California and the US. Located northeast of Bakersfield, California in the San Joaquin Basin, production is primarily from the Late Miocene Kern River Formation, a ~1000 ft thick succession of sandstones and mudstones deposited in a braided fluvial environment. The majority of production is low gravity (12-13º API) heavy oil which is produced by steam assisted gravity drainage. Although the field was discovered in 1899 and over two billion of the estimated 3 billion barrels of OOIP have been produced, significant reserves and resources remain. Previously, there had been no clear understanding of the rock properties and production behavior for the lower resistivity portion of the reservoir even though estimates of OIP contain considerable volumes. Additionally, while steam injection has typically resulted in good production from the higher resistivity reservoir, zones of bypassed and unproduced oil exist in intervals that have been steamed for many years.
A portion of the reservoir was described lithologically from core and by the nature of drainage interpreted from 4D saturation modeling. The integration of these two approaches has resulted in the characterization of drainage within a heterogeneous, complex fluvial reservoir for the entire section. The evolution of the oil leg and production character has been described both qualitatively and quantitatively. This approach has allowed for the identification of portions of the reservoir that are actively draining versus portions where drainage is not occurring, despite the fact that the oil has been characterized as recoverable. These non-draining areas can then be targeted for improved reservoir management. The Kern River asset team, now recognizing that the increased number of opportunities within the reservoir is investigating ways to specifically identify and target these volumes in an effort to maximize future potential.
BIO - Jonathan Allen is an earth scientist at Chevron in Bakersfield. Jon joined Chevron in 2003 and has worked a number of reservoir characterization projects integrating outcrop, core, log, and earth modeling data. Currently, he is working on development projects in the Kern River Field. He holds a BA in Geology-Biology from Colby College, Maine and an MS and PhD in Geosciences from the University of Nebraska-Lincoln. His areas of interest include sedimentology, stratigraphy, and integrated reservoir characterization.
Numeric Solutions, established in 1999 is a well-respected local company with worldwide clients based in Ventura. They specialize in representations of subsurface deposits of economic value to industry using proprietary software and advanced digital analysis of seismic, resistive and other advances measurement methods. The effort by Numeric Solutions is to bring deposits and/or structural elements together in 3D representations at depth so that the most cost effective extraction means and methods might be employed. When these analysis techniques are used for the same locations sequentially over time or commonly called “4D” analysis one can see deposit depletions, remaining reserves and effects such as recharge in how those deposits might be optimized. A leader in the field of structural analysis and a continuing sponsor of CGS programs and outreach efforts, we salute them for their outstanding contribution to the community and the industries they service.
Dinner Reservations EARLY $20 by 03/14/2014 - $25 after online pay online or at the meeting, but your reservation is necessary.
Updated 04-08-14 New April. Program - Add Field Trips - Updates