San Joaquin Geological Society Bakersfield California
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Change of Venue Announcement

San Joaquin Geological Society,
on October 13th, 2015
will be held at;

The Fraternal Order of Eagles
Eagles Lodge 1718 17th Street, Bakersfield, CA 93302

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The Veteran’s Hall asked the SJGS to move our monthly meetings to a different night so they could take on a new client who had requested every Tuesday evening. The Officers decided to stay with our traditional second Tuesday meeting times and move to a new venue. We have chosen the Eagles Lodge in the downtown vicinity for our new meeting location.

San Joaquin Geological Society, meeting on 10/13/2015 will be held at the Eagles Lodge, 1718 17th Street, Bakersfield, CA 93302.

Contact: Beckie Burston, cell 661-364-4845

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Current Abstract



Application of global deep-water outcrop belts to exploration and field extension in
Ventura Basin, California


Jonathan R. Rotzien
Basin Dynamics, LLC


Exploration and field extension wells drilled in the Ventura Basin continue to face key geologic risks including reservoir presence and reservoir deliverability. In particular, the Pliocene deep-water Pico and Repetto formations show a broad spectrum of lithofacies, depositional architecture, and reservoir quality over a stratigraphic interval exceeding 5000 m in the deepest parts of the basin. Further, a number of industry-sponsored studies have argued that the depositional environment for these formations ranges from leveed channels, to sandstone-rich lobes that take the shape of their sub-basin container, to braided lobe complexes that likely represent the deep-water equivalent to coarse-grained and gravelly terrestrial braided systems. Clearly, there is room to enhance the understanding of the sedimentology, stratigraphic architecture in target intervals, and reservoir characterization in this basin.


One of the methods to better understand the uncertainty in Ventura Basin reservoirs is via the study of global outcrop analogues. This presentation features segments of three of the most thoroughly studied and classic deep-water outcrop belts from the West Clare Basin, Ireland, to the Paleogene basins of Southeast France, to the Cretaceous Great Valley and Rosario groups, California, to highlight the stratigraphic complexities and similarities of each system to the Ventura Basin. The history of exploration into these turbidite-dominated outcrops began well over a half century ago and inspired the famous work that led to the identification of Bouma and Lowe division terminology. Today, these systems remain relevant as reservoir analogues for petroleum provinces and will continue to be useful for years as the nature of industry challenges evolve.

Despite decades of research, two important questions have not been solved using the deep-water outcrops in Ireland, France, and California. Using a core drilled through these outcrops, (1) can depositional environment be distinguished and lateral bed continuity be estimated using a process sedimentology approach, and (2) can deep-water sandstone margins be recognized and predicted? These questions address reservoir extent and reservoir quality using common core data that would be acquired in a routine drilling program. Characterization of high resolution stratigraphic data including grain size, sedimentary process, bed thickness, and bed length from previously unpublished sections in each system reveals the range of solutions to both questions as well as the applicability of the data in quantifying geologic risk and reducing uncertainty in modern Ventura Basin drilling programs.



Dr. Jon Rotzien is President of Basin Dynamics, LLC. His expertise is the sedimentology and stratigraphy of deep-water depositional systems, source-to-sink sediment transfer, and basin analysis. Jon aims to address key challenges in the exploration and production of petroleum, including reservoir presence and quality prediction in frontier basins, and reservoir connectivity and deliverability. Prior to his present position at Basin Dynamics, he was an exploration and appraisal geoscientist at BP. He received a Ph.D. in Geological and Environmental Sciences from Stanford University and a B.A. degree in Geology from Colorado College. He has published peer-reviewed research papers and scientific conference proceedings pertaining to petroleum geology, reservoir quality, reservoir characterization, sequence stratigraphy, process sedimentology, stratigraphy, and basin analysis.



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1How to join the society:

The San Joaquin Geological Society has no formal dues, and our activities are open to anyone interested in geology.

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