Nehring Associates

In developing the Basin and Play Evaluation Service, Nehring Associates has created dozens of standardized retrievals and displays of the key building blocks for analysis. In determining which retrievals and displays to develop, we chose those which best inform a broad range of upstream and midstream strategic decisions. The scope of potential choices is summarized below:

Size distributions are available in several ways, including:

Distributions by size rank
Distributions by size class
Cumulative probability and log-probability distributions
Spatial distributions by size class
Cumulative distributions by rank or size class
Distributions of play size by amount or size class

An extensive range of recent recovery growth information is available, including:

Distributions of recent absolute and percentage growth
Correlations of recent growth with size and year of discovery
Correlations of recent growth with various reservoir rock and fluid characteristics
Correlations of recent growth with development intensity
Correlations of growth histories with oil and gas price trends
Calculation of historic growth factors
Comparisons of recent growth among plays

Reservoir rock and fluid characteristics can be displayed as basic distributions, scatter plots with linear regressions, distributions by period of discovery or size class, and spatial distributions. Available characteristics include:

Area	Thickness
Depth	Porosity and permeability
Initial saturations	Natural drive mechanism
Initial pressure temperature	API gravity and sulfur content
Oil pour point and viscosity	Hydrocarbon gas composition
Non-hydrocarbon gas composition	Gas heating value and specific gravity
Formation water resistivity

A broad array of multivariate displays, such as porosity-depth, porosity-permeability, area and thickness, porosity and initial water saturations, API gravity and temperature, non-hydrocarbon gas composition, temperature, and lithology are also available.

Production histories are available in a variety of formats, including:

Distribution of field or reservoir histories by product
Summations by various geographic, geologic, or temporal groupings
Normalized production profiles of recent discoveries
Correlation of production with sizes, growth, period of discovery, and reservoir rock characteristics
Distributions and comparisons among plays by product

Discovery histories can be provided in several forms, including:

Basic order of discovery by completion date
Cumulative discovery curves by number and amount discovered
Average size and distribution of sizes by period of discovery
Spatial patterns of discovery over time
Rank order of discovery relative to size, area, depth, or water depth
Order of discovery relative to oil and gas prices
Discoveries by operator

Measures of development intensity and economics available include:

Well spacing	Crude oil recovery factors
Average recovery per well	Reservoir depth and water depth
Post-primary oil recovery methods