The Qingxi Depression, over an area of merely 490 km2, is a petroliferous depositional center within the Jiuxi Basin. Lower Cretaceous source rocks in this depression are a suite of mudstones, dolomitic mudstones and ...The Qingxi Depression, over an area of merely 490 km2, is a petroliferous depositional center within the Jiuxi Basin. Lower Cretaceous source rocks in this depression are a suite of mudstones, dolomitic mudstones and argillaceous dolostones formed in a deep lacustrine environment. Although their distribution area is small, their thickness is sizable. High abundance and favorable types of organic matter provide an important material basis for petroleum generation. The majority of the source rocks in the Qingxi Depression are of maturation conditions for generating significant volumes of petroleum, and with only one peak generation period that commenced in the Neogene. The Himalayan movement results in a northerly overthrusting of the Qilian Mountains nappe to form a series of compressional faults, shear faults and rock fractures, all of which serve as main conduits for petroleum migration from west to east, and, in addition, as the reservoir space of the Qingxi Oilfield. Based on these factors, it is suggested that the future exploration be on the Qingxi low bulge and favorable fracturing zone within this depression.展开更多
Storm rainfall and severe storm rainfall can directly cause flood, and usually cause a series of secondary disasters. In mountain areas, the abrupt mud rock flow and landslide disasters motivated by storm rainfall are...Storm rainfall and severe storm rainfall can directly cause flood, and usually cause a series of secondary disasters. In mountain areas, the abrupt mud rock flow and landslide disasters motivated by storm rainfall are especially serious. So, it is negligible content to pay more attention and strengthen the study of storm rainfall secondary disasters in studying storm rainfall disaster.In the National Key Project 85-906-09,we have developed these aspects’studies, which not be ignored by some relevant sections展开更多
文摘The Qingxi Depression, over an area of merely 490 km2, is a petroliferous depositional center within the Jiuxi Basin. Lower Cretaceous source rocks in this depression are a suite of mudstones, dolomitic mudstones and argillaceous dolostones formed in a deep lacustrine environment. Although their distribution area is small, their thickness is sizable. High abundance and favorable types of organic matter provide an important material basis for petroleum generation. The majority of the source rocks in the Qingxi Depression are of maturation conditions for generating significant volumes of petroleum, and with only one peak generation period that commenced in the Neogene. The Himalayan movement results in a northerly overthrusting of the Qilian Mountains nappe to form a series of compressional faults, shear faults and rock fractures, all of which serve as main conduits for petroleum migration from west to east, and, in addition, as the reservoir space of the Qingxi Oilfield. Based on these factors, it is suggested that the future exploration be on the Qingxi low bulge and favorable fracturing zone within this depression.
文摘Storm rainfall and severe storm rainfall can directly cause flood, and usually cause a series of secondary disasters. In mountain areas, the abrupt mud rock flow and landslide disasters motivated by storm rainfall are especially serious. So, it is negligible content to pay more attention and strengthen the study of storm rainfall secondary disasters in studying storm rainfall disaster.In the National Key Project 85-906-09,we have developed these aspects’studies, which not be ignored by some relevant sections
