Why Big Oil Deals Are Ready for an Explosion, in Three Charts

A worker stands on a high level platform and looks out across the illuminated Atyrau oil refinery, operated by KazMunaiGas National Co., in Atyrau, Kazakhstan, on Thursday, July 2, 2015. Kazakhstan is the former Soviet Union's second-largest oil producer.

Photographer: Andrey Rudakov/Bloomberg
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The long wait for oil and gas deals appears to nearing an end as two transactions worth more than $18 billion were announced in the past 24 hours.

Shale producer WPX Energy Inc. today said it plans to buy a closely held exploration company for $2.35 billion, and refiner Marathon Petroleum Corp. Monday said it will buy a major natural gas processor for $15.8 billion.