Shale pioneer Chesapeake Energy has approached its peer Southwestern Energy for preliminary talks about a possible acquisition that would create America’s top shale gas producer by market value, Reuters reports, citing sources with knowledge of the matter. The talks are in the early stages and there are no guarantees a deal could be reached, according to Reuters’ sources. Chesapeake Energy, which went through bankruptcy in 2020 when oil and gas prices crashed, has been solidifying in the past year its strategic…