Retired Joint Pipeline Office geologist Joe Dygas gives us this O&G Journal tip and editorial remark:  Oil and natural gas are indispensable in a growing world energy market, and Royal Dutch Shell PLC plans to make gas roughly half of its total production by 2012, its chief executive officer said on Oct. 8.   “This is not merely a shift in our portfolio. Increasing natural gas production and transportation by liquefying it and shipping the LNG to global markets means that more natural gas will be available to displace coal as the [...]