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The two players first exchanged words across the net during the ninth game of the opening set, which US Open champion Murray eventually won 7-4 on the tiebreak.
Criticised by Berlocq for taking too long in between a few points, the third-seeded Scotsman responded by complaining to the chair umpire about the high decibel level at the other end of the court.
"He (Berlocq) complained I was taking too long between the points, and there were maybe one or two points where that could have been an issue," Murray, 25, told reporters after sealing victory in just under two hours on Stadium Court Two.
"But when someone is grunting like that it's every single shot. And also, when you're doing it that loud, but you aren't doing that on every single shot, there is obviously a reason for why you're grunting like that.
"If I'm going to be supposedly taking too long between points on one or two points, then grunting that loud for that long is like an extended grunt as well. It's making a noise when you're hitting the ball. It's annoying."
Told that Berlocq had earlier said he had no idea his grunting would bother an opponent, Murray prompted laughter by replying: "But that's what all of the real grunters say.
"You know, it's like sometimes silence and then it comes out of nowhere. It's a bit of a shock. So that's what I don't understand with it. To go from nothing to the loudest grunt you can do, it makes no sense."
Murray, who broke Berlocq twice in the second set to book his place in the last eight at Indian Wells, said he had never previously spoken to a chair umpire about on-court grunting.
"When I have been on the court or off it, it's never been something I have found to be really that off-putting," the world number three said.
"But if it's going to be suggested that I am using gamesmanship by taking too long, then you can't be making noises like that on the court. I haven't experienced it like that before.
"It was extremely, extremely loud, more than what I have experienced from any other player on the tour," added the Murray, who clinched his first grand slam crown at last year's US Open after winning the Olympic gold at the London Games.
Murray, a losing finalist here in 2009, will meet seventh-seeded Juan Martin Del Potro of Argentina in the quarter-finals on Friday.
Results on Wednesday from the eighth day of the ATP Masters and WTA BNP Paribas Open (x denotes seeded player):
Men
Fourth round
Jo-Wilfried Tsonga (FRA x8) bt Milos Raonic (CAN x17) 4-6, 7-5, 6-4
Kevin Anderson (RSA) bt Gilles Simon (FRA x13) 6-3, 1-6, 6-4
Tomas Berdych (CZE x6) bt Richard Gasquet (FRA x10) 6-1, 7-5
Roger Federer (SUI x2) bt Stanislas Wawrinka (SUI x18) 6-3, 6-7 (4/7), 7-5
Andy Murray (GBR x3) bt Carlos Berlocq (ARG) 7-6 (7/4), 6-4
Juan Martin del Potro (ARG x7) bt Tommy Haas (GER x19) 6-1, 6-2
Rafael Nadal (ESP x5) bt Ernests Gulbis (LAT) 4-6, 6-4, 7-5
Women
Quarter-finals
Maria Kirilenko (RUS x13) bt Petra Kvitova (CZE x5) 4-6, 6-4, 6-3
Maria Sharapova (RUS x2) bt Sara Errani (ITA x6) 7-6 (8/6), 6-2
