The summer signing netted his fifth goal of the season after Nedum Onuoha put one into his own net early on at Upton Park, with Harry Redknapp's side still bottom of the table
Sam Allardyce's side took an early lead when Nedum Onuoha diverted a cross from Stewart Downing into his own net, though the Rs argued that Enner Valencia had handballed as the delivery dropped into the box.
The away team had little to offer, however, by way of a riposte and West Ham doubled their advantage shortly after the break. James Tomkins's attempted shot looped over the head of goalkeeper Robert Green for Diafra Sakho to bury his fifth goal for the club.
QPR went into the match having lost all three Premier League games on the road since gaining promotion back to the top flight and it was not hard to see why as they struggled to make any impression up front.
|VIEW FROM UPTON PARK
|By Harry Sherlock
West Ham come away from this London derby with a comfortable 2-0 win, thanks to the superb displays of Diafra Sakho, Enner Valencia and Mauro Zarate. In truth, Sam Allardyce will be slightly disappointed that his side did not put the Rs to the sword and score four or five.
Harry Redknapp's shortcomings, however, were brutally exposed. Not one QPR player grabbed the game by the scruff of the neck and they were soundly beaten. They will face tougher challenges than this and, on this evidence, have next to no chance of negotiating them.
With Burnley taking a point at Leicester City on Saturday, QPR look in dire straits. They must improve quickly or they will be down by April.
However, they were done no favours as a crucial handball was missed by referee Anthony Taylor in the lead-up to the opening goal before Sakho's strike made the game safe.
West Ham made two changes from their loss to Manchester United as Carl Jenkinson replaced the injured Guy Demel and Mauro Zarate returned ahead of Diego Poyet.
Defender Onuoha made his first league start of the season for QPR, while Karl Henry and Junior Hoilett were recalled to the first XI.
The home side went ahead after just five minutes when a superb Stewart Downing corner sailed over a melee on the edge of the six-yard box and was bundled into his own net by Onuoha. Green appealed for handball after Valencia held his arms aloft following a nudge in the back but referee Taylor failed to notice a fingertip touch and the goal stood.
Valencia then shot just wide with a more orthodox effort following good build-up play from Downing and Sakho while, at the other end, Charlie Austin shot straight at Adrian after skillfully getting past Tomkins.
Much of the rest of the first period was played out in a strangely subdued atmosphere, though, as both sides struggled to produce quality play.
Redknapp brought on another West Ham old-boy in Bobby Zamora at the break, replacing Hoilett, and the striker created a chance for Austin at the start of the second half but he fired wide.
Sakho then continued his scoring streak when he headed in from close range just short of the hour mark after Tomkins had won a far-post challenge and lofted the ball back across the area.
As QPR pressed for a way back, Niko Kranjcar tested Adrian with a long-range free kick which bounced awkwardly in front of goal and substitute Adel Taarabt fired just wide with another decent strike but there was no way back for the visitors.
In fact, replacement Kevin Nolan could have made it three for West Ham late on after being set free by the excellent Downing but his low shot was straight at Green.