(ShareCast News) - BHP Billiton briefed investors in London on Tuesday, outlining what it called a "broad range of opportunities" within its petroleum business to grow value, returns and cash flow as markets improve."Having both minerals and petroleum in our portfolio allows us to maximise the value of our petroleum assets at the right point in the cycle," said BHP Billiton president operations petroleum Steve Pastor."While currently well supplied, underlying fundamentals suggest both oil and gas markets are improving more quickly than our minerals commodities."Pastor said that over the next decade, demand growth, natural field decline and the effects of industry wide investment deferrals are expected to create a significant opportunity to invest and maximize value in oil."By 2025 the world is expected to consume more than 100,000 barrels of liquids per day - a third of which would come from new sources."We are well placed to capitalise on this opportunity," Pastor said, adding: "We have a large, high quality resource base."He explained that BHP's focus on productivity has significantly reduced both operating and capital costs, supporting a range of shale and conventional investment opportunities that would generate compelling returns at today's prices."As a result, Petroleum is well placed to maintain its position as BHP Billiton's highest margin business and to grow its free cash flow contribution."BHP Billiton runs its onshore US assets to maximise value rather than volumes and will continue to adjust its investment plans to reflect market conditions."Pastor said the onshore US business gives the company valuable flexibility, and its shale assets generate cash at current prices, with significant upside should oil and gas prices recover as we expect."We operate in the heart of some of the best shale plays and by further reducing costs and improving capital efficiency to levels among the best in the industry, we have increased our investable well inventory."As a result, we now have up to 1,200 undrilled net oil wells, contingent upon trials in the Eagle Ford, and 220 undrilled net gas wells that generate a minimum 15%internal rate of return at $50 per barrel of oil and $3 per MMbtu."In the Permian, Pastor said the company has access to over one billion barrels of oil equivalent, meaning that field has the potential to become the largest production and free cash contributor in the group's petroleum portfolio within five years."In conventional, BHP Billiton is expecting unit operating costs to remain at approximately $10 per boe over the 2017 and 2018 financial years as it pursues a number of options to extend high margin production from its existing facilities."We have a rich portfolio of brownfield project options, with total capital expenditure of $2.5bn and an average IRR of 45% that will help offset field decline."With significant improvements in capital efficiency, major capital projects like Mad Dog 2 were now economically attractive, even below $50 per barrel of oil, Pastor said.BHP Billiton also announced positive drilling results at the Caicos exploration well in the Gulf of Mexico.Located in Green Canyon 564, the well is approximately 100 miles south of the Louisiana coast in the deep water Gulf of Mexico.Caicos was drilled to a total depth of 30,803 feet and encountered oil in multiple horizons."We are encouraged by the Caicos results and are moving to further appraise the area," added Pastor."The next step will be drilling the Wildling well in November. With success at Caicos and Shenzi North, we continue to be optimistic around the opportunity for a commercial development in the area."