Oil and gas producers made deals worth $27.1 billion in the quarter, up from $21 billion in the third, helped by three multi-billion dollar acquisitions in the prolific Permian basin of West Texas and New Mexico.

ConocoPhillips acquired Concho Resources for $13.3 billion, the biggest pure shale acquisition by any company since 2011, topping the list. It was followed by Pioneer Natural Resources' deal to buy Parsley Energy for $7.6 billion.

Diamondback Energy also took over publicly-traded QEP Resources and private equity-backed Guidon Operating for just over $3 billion.

Data from Enverus also showed deal flow, or the number of deals announced, was only 140 in 2020. It was the lowest since at least 2006, as a number of buyers focused on preserving cash to pay down debt or returning capital to shareholders.

According to Enverus, corporate consolidation, especially among small and mid-size companies that require scale, and non-core asset divestments could be seen in 2021.

"The limiting factor for consolidation in 2021 will be the number of attractive merger partners left at the end of a very active year," Enverus M&A analyst Andrew Dittmar said.

Companies that went through a Chapter 11 restructuring in 2020 could also emerge as potential merger partners now that debt loads are right-sized, Enverus added.

(This story corrects name of analytics firm to "Enverus" from "Enervus" in headline and text.)

(Reporting by Rithika Krishna; Editing by Krishna Chandra Eluri)