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《China Petrleum Exploration》 2000-03
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Petroleum System of Northwestern Margin of Qaidam Basin.

Zhang Yinghong;Li Wei;Men Xiangyong;Bai Shuyan;Cen Xiaochun Chinese Institute of Petroleum Exploration and Development, Beijing 100083  
A petroleum system of J_1-R(!) at northwestern mar-gin of Qaidam Basin has been found and studied inthis research, which is a system with characters of low-middle degree of oil charging (SPI3.9), mixedtype of charging-migrating-accumulating, middle im-pedance and obviously resource loss. The system ischaracterized by a bottom hydrocarbon-generating, inwhich main source rocks are composed of relict la-custrine fault-depression sediments of Lower Jurassic;Tertiary compressive depression deposits form themajor migrating and accumulating system. The verti-cal migrating and accumulating are controlled by a re-gional. pelitic caprock of the Middle Eocene, belowwhich, the migration and accumulation of oil-gas aremainly happened in lateral direction and vertical mi-grating of oil-gas only appears in layer above the cap-ping because a "migrating window" is formed by localfault, where a double layer type can be detected withinthe system. The system had been primarily formedfrom early Oligocene which is a period of formingprimary oil-gas pools. A secondary oil-gas pools anddry-gas pools should be formed at the early Pliocene,and the key preservation stage came during the earlyQuaternary The major factors for controlling qualityand amount of resource lost should be both of the pre-serving degree of top capping beds in the system andthe effective boundary of the system.
【CateGory Index】: P618.13
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