阳信洼陷古近系湖盆复合生烃系统的地球化学特征

用粒径小于100 μm的泥沙分别配置浊度为30、60和90 NTU(Nephelometric Turbidity Units)的混浊水体,将穗花狐尾藻(Myriophyllum spicatum L.)成体植株分别种植于上述水体中,2个月后,利用水下饱和脉冲荧光仪(Diving-PAM)测定植株叶片的叶绿素荧光参数.结果表明,水体悬浮泥沙对狐尾藻成体植株Fv/Fm和Fo影响不显著,植株PSⅡ无显著损伤.用30 μmol photon/(m2·s)的光化光照射10 s,在30和60 NTU的混浊水体中植株△Fv/Fm、qP和rETR与对照的差异不显著;在90NTU的水体中,qP、rETR与对照的差异显著(P＜0.05);qN值≤0.1,表明在低光化光照射下叶片的热耗散少,能量更多的参与了光化学反应.在悬浮泥沙水体中植株的rETR日变化幅度显著小于对照,植株的光合作用随水体浊度的增加显著降低.Fv/Fm日变化呈较为平缓的"V"形变化,植株受到的光抑制程度低;泥沙浊度≥60 NTU时,Fv/Fm恢复变慢,但与对照差异不显著.rETRmax随泥沙浊度升高呈下降趋势,光合作用能力显著降低.结果表明穗花狐尾藻是一种较为耐受悬浮泥沙水体的沉水植物,悬浮泥沙对植株光合系统PSⅡ、抗光抑制能力无显著影响,但对光合作用能力影响显著(P＜0.05).

Multiplex hydrocarbon-generation system in Yangxin Sub-depression and its exploration potential

The shahejie Formation of Paleogene System is the most important hydrocarbon generation interval in Yangxin Sub-depression. Multiplex-set hydroearbon generation series of strata being of different geologieal-geoehemieal eharaeteristies were formed beeause of the staging property of the filling and evolution of Paleogene lake basin and the eyelieity of sedimentary proeess. The organie earbon eontent, the parameters of pyrolysis and biomarker eharaeters of saturated hydroearbon was investigated by using the means of Roek-Eval, GC-MS. The Sha-4 hydrocarbon souree roeks formed under the semi-saline to saline water environment, the eontent of organie matter (TOC) was 1.5% averagely, and most of them was being matured and formed into matured oil;The Sha-3 hydroearbon souree roeks formed under the deep-lake environment with fresh-slight saline water, the content of organic matter (TOC) was 3.5% averagely, and most of them was still immature and formed into immature oil;The Sha-1 immature hydroearbon souree roeks formed under the salt lake-saline water environment, the eontent of organie matter(TOC) was 5.0% averagely, they are formed into biogas.