Lacustrine Depositional System

Abstract

Lakes are low-lying areas that collect running water on land. Currently, the total area of lakes all over the world is approximately 250 × 104 km2, which accounts for 1.8% of the global land area. In China, only 1% of the land area is covered by lake water. Lakes were scattered like stars in China during the Meso-Cenozoic era. More than 10 large oilfields, such as Daqing, Shengli, Liaohe, and Dagang, were found in these lacustrine strata. They constitute a feature of Chinese petroleum geology and occupy a unique place in the global petroleum industry.