Unconventional Natural Gas and Other Petroleum Resources Mission
The mission of the unconventional natural gas and other petroleum resources program element is to increase the supply of domestic natural gas and other petroleum resources through reducing the cost and increasing the efficiency of exploration for and production of such resources, while improving safety and minimizing environmental impact.
“Unconventional natural gas and other petroleum resource” is defined in the Energy Policy Act as natural gas and other petroleum resource located onshore in an economically inaccessible geological formation, including the resources of small producers.
Resource Opportunities and Priorities
Unconventional natural gas resources are best described as those gas accumulations that are hard to characterize and commercially produce by common exploration and production technologies. These resources are typically located in heterogeneous, extremely complex, and often poorly understood geologic systems, often easy to find but difficult to produce. For example, while it is not difficult to find large lenticular sand packages in many basins it is very difficult to determine their flow properties from petrophysical well surveys and to design effective completion procedures. Furthermore, because of their very low permeability, establishing gas flow at a reasonable commercial rate requires costly production stimulation operations. These types of considerations are responsible for the high risk factors and unpredictable results often associated with unconventional gas exploration and development projects that inhibit industry investment in these resources.
The largest volume of unconventional gas in the United States occurs in three specific resources - tight sands, gas shales, and coalbed methane. These three resources occur in numerous geologic basins all across the lower 48 States. According to the latest estimate by the National Petroleum Council, the volume of technically recoverable gas from these three resources is in excess of 293 trillion cubic feet (TCF).
In addition to being more accessible and having the potential of attracting serious industry participation, these three resources often occur at shallower depths under moderate to low pressure and temperature conditions. Thus, their exploitation may not hinge upon the development of the new materials and technologies that would have to be developed for handling the hostile environments prevailing in other unconventional environments.
The funding available for the Unconventional Resources program element is not sufficient to address all types of unconventional resources and have a measurable impact in a time frame of a few years. As it is desirable for the program to show some initial results in this short time frame, a substantial amount of the early R&D investment will be directed toward gas shales, tight sands and coalbed methane. However, this prioritization does not preclude research and development on other unconventional resources such as deep onshore gas, complex carbonate reservoirs and basin-centered gas, particularly during the latter years of the program plan and/or in pursuit of research and development aimed at development of longer term objectives.
Unconventional Resources Program Strategic Goals
The Unconventional Resources Program will focus on the following for the 2008 Annual Plan:
Goal #1: Through new technology development and dissemination increase the size of the technically recoverable unconventional gas resource base.
Goal #2: Convert through a focused research program technically recoverable unconventional gas resource to economically recoverable gas that can be harvested in an environmentally sound manner.
Goal #3: Develop technologies for improving unconventional resource recovery with minimum environmental impact.
Goal #4: Develop the R&D Program’s science building capacity; Develop significant industry support and participation; and, Develop a Program with a strong and successful technology dissemination component.
Unconventional Resources Program Activities
Building on a series of workshops and studies conducted by RPSEA and others over the last several years, several key themes were identified, as described in the table below.
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Potential Technical Themes in Unconventional Resources
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Gas Shales
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Rock properties/formation evaluation
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Fluid flow and storage
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Stimulation
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Water management
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Coalbed Methane
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Produced water management
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Tight Sands
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Natural fractures
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Sweet spots
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Formation evaluation
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Wellbore-reservoir connectivity
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Surface footprint
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These themes and the supporting information were captured in a draft Annual Plan that has been submitted to the Department of Energy (DOE) for review. After an approved Annual Plan is developed by DOE, open solicitations will be issued for research in the areas specified in the Annual Plan. A key element of the program will be an integrated focus on specific target resources, with sufficient involvement by the producers investing in the development of those resources to ensure rapid adoption of program technology to meet the program goal of increasing the value of unconventional resources to the domestic energy consumer, while improving safety and minimizing environmental impact.
Unconventional Selection Process
Proposals submitted for the Unconventional Onshore Program Element are divided into topic areas (e.g. Completion, Reservoir Engineering, Resource Assessment, etc.) for review, in order to align the technical expertise and experience of reviewers with the content of the proposals. Three or more reviewers provide technical evaluations of the proposals within each topic area. To the greatest extent possible, all of the proposals within a topic area are evaluated by the same set of reviewers. The Program Advisory Committee (PAC) selects proposals for funding based on the technical review scores and the priorities associated with the various topic areas and targeted resources. Prior to considering individual proposals, the PAC assigns priorities to each of the topic areas for each of the targeted resources (currently gas shales, tight sands and CBM). The highest priority resource/topic area combinations are given the most weight in project selection, although all proposals with competitive technical review scores are considered for funding. The PAC considers factors such as balance among the time scales associated with technology and resource development, diversity of technical approach and the geographic distribution of targeted resources when developing a portfolio of projects intended to maximize the probability of meeting program goals.