Chevron (CVX, Financial) is negotiating with Tokyo Gas for the sale of its natural gas assets in eastern Texas, potentially valuing the deal at up to 1billion,accordingtoinsiders.ThistransactionfocusesonChevron′sholdingswithintheHaynesvilleShalefield.TokyoGasaimstoboostitsaccesstoU.S.fuelreserves,essentialforJapan′senergysupplygivenitsrelianceonimportedfossilfuels.InDecember,TokyoGasexpandeditspresenceintheHaynesvilleBasinbyacquiringRockcliffEnergyfor2 ...