How E&P companies forecast future production from unconventional gas wells-an issue usually confined to the petroleum engineering realm-is now in the limelight. Recently, U.S. regulators began investigating whether some publicly owned shale-gas producers have overestimated their reported reserves in previous filings.As part of the probe, the U.S. Securities and Exchange Commission has subpoenaed company records, including those from early 2008. The documents reportedly include material related to the analyses of production-decline curves, historical performance of shale-gas wells vs. production forecasts, and the appropriateness of various decline-curve-analysis (DCA) methods.
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