Keywords:Delta conveyance, Sacramento–San Joaquin Delta, water project operations
This study assessed the history of oil production and pressure changes in the southern portion of the San Joaquin Basin in California’s Central...
This study assessed the history of oil production and pressure changes in the southern portion of the San Joaquin Basin in California’s Central Valley as a reverse analog for understanding the pressure response to potential geologic carbon sequestration.
Sequestration involves injecting carbon dioxide into permeable strata such as those that trap oil. This results in pressure increases in the existing fluid in the subsurface that can provide a motive force for brines at those depths to migrate into groundwater, affecting its quality. The pressure can also cause differential ground surface uplift that can affect surface water flow, particularly in engineered water conveyances such as canals.
The strata underlying the Central Valley have been assessed as having considerable capacity to store carbon dioxide, but the area also contains urban areas and extensive agriculture that rely on engineered surface water delivery systems and groundwater supplies. The Stevens Sand, Temblor Formation and Vedder Formation were identified as having the largest cumulative net production from typical geologic carbon sequestration depths.
Two oil pools were identified in each of these stratigraphic units for more detailed analysis, which included converting fluid level data to pressure at the pool scale. Data were collected that allowed an assessment of the hydraulic connectivity of each unit. The results indicated that the Vedder was hydraulically connected at the near basin scale, the Stevens was hydraulically connected at the pool scale and was disconnected between pools and the Temblor was disconnected within pools. Researchers used these results to analyze possible brine leakage driven by geologic carbon sequestration. They also reviewed over 200 articles on historic groundwater contamination. They concluded that no instance of contamination due to upward leakage of brine in the Central Valley was reported.
Facing a fourth consecutive year of drought in 2015 and consequential threat of curtailments, farmers in the Delta proposed a voluntary program to...
Facing a fourth consecutive year of drought in 2015 and consequential threat of curtailments, farmers in the Delta proposed a voluntary program to significantly reduce their surface water diversions during the critical summer growing season. This is a report describing the context, origin, objectives, regulatory framework, implementation and results of that program.
The Delta Plan should identify the authorities of the State Water Board that may be employed to implement its goals, subgoals, and strategies....
The Delta Plan should identify the authorities of the State Water Board that may be employed to implement its goals, subgoals, and strategies. The State Water Board’s Bay Delta Plan and Delta Strategic Workplan should be incorporated into the Delta Plan.
The results of this effort are organized and presented as follows in this Report: • A review of the Dialogue process that provides...
The results of this effort are organized and presented as follows in this Report:
• A review of the Dialogue process that provides additional details about participating
stakeholders and their perspectives;
• A description of the background and challenges for California’s groundwater management and
current efforts to achieve measurable progress toward sustainable management;
• A set of key Findings; and
• A package of seven policy Recommendations intended to lead to a new state policy for meaningful, measurable improvement in groundwater management within realistic timeframes.
The Recommendations in this report reflect the best judgments of CWF about what is needed to achieve sustainable groundwater management while keeping decision making primarily at local and regional levels. CWF remains committed to a constructive public discussion about this critical issue and, ultimately, to meaningful legislative and policy actions.