论文部分内容阅读
西北地区侏罗纪煤系中主要成烃显微组分是孢子体、角质体、藻类体、沥青质体、碎屑类脂体和基质镜质体等，木栓质体和树脂体等早期成烃组分含量极低。侏罗纪煤系有机质成烃演化特征与一般湖相有机质稍有差异，但基本上仍然遵循一般有机质热降解成熟生油模式，主要生油阶段的Ｒｏ值为０．７％～１．２％，生油高峰Ｒｏ值约为０．９５％。目前西北地区侏罗纪煤系烃源岩Ｒｏ值一般为０．４％～１．３％，多数地区成熟度较低，在山前深坳陷地区成熟度较高，烃源岩Ｒｏ值大于０．７％，进入大量生油阶段，西北地区主要煤系含油气盆地油气田均分布于这些地区，烃源岩成熟度对油气田形成有明显的控制作用。西北地区侏罗系有利的生烃区域基本分布在侏罗纪是沉降、沉积中心而后续埋藏又较深的山前坳陷。图４表１参４５（王孝陵摘）
The main hydrocarbon generation microscopic components in the Jurassic coal measures in northwest China are sporophyte, keratoplast, algae, asphaltenes, clastic lipids and matrix vitrinites, Very low content of components. The evolution characteristics of organic matter in Jurassic coal measures are slightly different from those in the general lacustrine facies. However, the mature oil-generating mode of thermal degradation of organic matter is still basically followed. The Ro value in the primary oil-producing stage is 0.7% -1.2% Ro peak oil value is about 0.95%. At present, the Ro value of Jurassic coal measure source rocks in the northwestern China is generally 0.4% ~ 1.3%, most areas have low maturity and high maturity in the piedmont depression. The Ro value of source rocks is greater than 0. 7% into the large oil production stage. The major coal-bearing petroliferous oil and gas fields in northwest China are all distributed in these areas. The maturity of source rocks has obvious control over the formation of oil and gas fields. The favorable hydrocarbon generation areas of the Jurassic in the northwest are basically distributed in the Jurassic sedimentary and sedimentary centers and subsequently buried and deep piedmont piedmont. Figure 4 Table 1 reference 45 (Wang Xiaoling pick)