Chevron Texaco (CVX, news, chart) call volume is outpacing put volume by a margin of three to one. The stock is down $2.95 to session lows of $81.23, as crude oil sends energy-related shares lower in afternoon trading Thursday. Crude is down $1.30 to $108.05 a barrel. In the options market, 15,000 CVX calls have traded, compared to 5,000 puts. The December 95 calls are the most actives, with a block of 10,000 contracts traded on the offer or $1.35 at 10:41 on the CBOE. Open interest is 12,248 and today’s action is possibly the unwinding of a buy write, as a block of 210,000 CVX shares traded within minutes of the call options.