Tight Gas

{
  "id": "MLC-T-ENV-028126",
  "term": "Tight Gas",
  "field": "Environment",
  "definition": "1. Is natural gas trapped in a highly mixed mineralogy sandstone, shale, or limestone formations which has very low permeability and porosity. While conventional natural gas accumulations, once drilled, contain gas that can usually be extracted quite readily and easily, a great deal more effort, including hydrofracturing, has to be put into extracting gas from a tight formation.\n\n2. Natural gas produced from reservoir rocks with such low permeability that massive hydraulic fracturing is necessary to produce the well at economic rates. Tight gas reservoirs are generally defined as having less than 0.1 millidarcy (mD) matrix permeability and less than ten percent matrix porosity [Original source: https://www.eia.gov/tools/glossary].",
  "references": [
    "USGS Energy Resources Program Energy Glossary & Acronym List",
    "Federal LCA Commons Elementary Flow List for Life Cycle Assessment"
  ],
  "url": "https://mlchart.com/terminology/environment/tight-gas/"
}