La Cortez Energy Closes Acquisition of Avante Petroleum Colombia Limited and $10MM Financing

Online, March 11, 2010 (Newswire.com) - The colombian oil company La Cortez Energy, Inc. ("La Cortez" or the "Company") (OTCBB: LCTZ) and Avante Petroleum S.A. ("Avante") are pleased to announce the signing of a stock purchase agreement for and simultaneous closing of La Cortez' acquisition of Avante's subsidiary Avante Colombia S.a.r.l. ("Avante Colombia") in exchange for common stock of La Cortez. The purchase includes Avante Colombia's Colombian branch, Avante Colombia Ltd Sucursal. Avante holds interests in oil fields covering 11,535 acres in the Catatumbo region in northeast Colombia.

Avante Colombia currently has a 50% participation interest and is the operator of the Rio de Oro and Puerto Barco
production contracts with Ecopetrol in the Catatumbo area, under an operating joint venture with Vetra Exploracion y
Produccion S.A. Independent engineering reports on behalf of Avante have estimated a total resource potential of
approximately 1.4 million barrels of oil. (La Cortez has not yet audited such reserves in conformity with US GAAP.) Under
the terms of the stock purchase agreement, La Cortez and Avante have also agreed to enter into a joint venture to develop
further exploration opportunities in Colombia.

The main terms of the transaction are:

i. La Cortez has acquired 100% of the outstanding stock of Avante Colombia from Avante in exchange for 10,285,819
common shares of La Cortez.

ii. Avante has invested $5.0 mm in a units offering of common equity of La Cortez at a price of $1.75 per unit (for a
total of 2,857,143 units), with each unit consisting of one share of La Cortez common stock and a three-year
warrant to purchase one share of common stock exercisable at $3.00 per share.

iii. Avante intends to continue to participate as a working interest partner in the development of the acquired
Catatumbo assets.

La Cortez also welcomes the nomination of Mr. Alexander Berger, the CEO of Oranje Nassau Energie B.V., to the Board of
Directors of La Cortez. Mr. Berger has a career of over 15 years in the oil and gas industry, having started his career at
Shell International. As CEO of Oranje-Nassau Energie, a privately held independent oil and gas company based in
Amsterdam, he is responsible for managing a portfolio of properties that currently include positions offshore Netherlands,
the United Kingdom and Gabon with a developed reserve base of approximately 20 million BOE and current production of
7,000 BOE per day.

Simultaneously with the closing of the Avante purchase, La Cortez completed a private placement for an additional $5.0
million in a units offering to accredited investors at a price of $1.75 per unit (for a total of 2,857,143 units). (This amount
includes $2.5 million that closed on December 29, 2010, and approximately $1.0 million that closed in January 2010, as
previously reported.) Each unit consists of one share of common stock and a three year warrant to purchase one half share
of common stock exercisable at $3.00 per whole share. Haywood Securities Inc. provided $2.5 million.

The proceeds of the financings be used for general corporate purposes including, but not limited to, the development of the
assets of Avante Colombia.

After giving effect to the acquisition of Avante Colombia and the investments by Avante and the other investors, Avante
owns approximately 33% of the shares of the colombian oil company La Cortez common stock outstanding.

Marcel van Poecke, a principal shareholder and Chairman of the Board of Avante S.A. and Oranje-Nassau Energie B.V., said, "We are very pleased with this transaction, which provides us with a platform for growth in Colombia, which we have long identified as a geographic priority given the country's substantial undeveloped hydrocarbon potential and attractive fiscal and regulatory framework. We will focus on contributing to La Cortez in developing the Avante Colombia assets together with our partner Vetra and on further expanding in Colombia. Our confidence as key shareholders in the future of La Cortez and its management team is further underscored by our capital commitment, which will allow La Cortez to aggressively pursue additional development and exploration opportunities."

Andres Gutierrez, President and CEO of La Cortez, commented on the announcement, "We are very pleased to have concluded this transaction. We have already commenced the execution of our plans to continue the development of the Avante Colombia assets. We are very enthusiastic about the potential of these blocks. In addition, we welcome our new shareholders and board member, and we have great expectations about their contribution in searching for new opportunities as well as in the development of our current assets. We anticipate this transaction will create benefits for all our different stakeholders."

Macquarie Capital acted as financial advisor to La Cortez in connection with its acquisition of Avante Colombia.