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" ... 20-40 proppant (diameter about 0.5 mm) evolved as the optimum proppant in most gas and oil wells, until the resource known as coalbed methane entered the scene in the 1980s. Coal contains large amounts of natural gas but to get it out almost all wells had to be fracked. ... "
" ... We see an increasing portion of trade not indexed to oil but to competitive pricing set by natural gas hubs such as TTF (Title Transfer Facility), NBP (National Balancing), JKM (Japan-Korea Marker), or HH (Henry Hub). In addition, traditional long-term (three or four decades even) contracts are often replaced by short or medium-term contracts or by spot purchases. A steadily increasing number of suppliers draws on different types of gas resources (from traditional ones to unconventional shale or coalbed methane) which adds complexity to cost and price formation. ... "