沾化凹陷R_o分布规律及影响有机质成熟度的因素

DISTRIBUTION CHARACTERISTS OF R_o AND FACTORS INFLUENCING THE ORGANIC MATURITY IN THE ZHANHUA DEPRESSION

结合实际资料,综合确定Ro=0 4%为该区生烃门限(含低熟油),相应的深度门限平均为2250m左右,温度门限平均在90℃左右。造成Ro值相对较低的相关因素如下:有机质成分、温度、压力、埋深等。通过比较,沾化凹陷中渤南洼陷和孤北洼陷生烃能力强,而富林洼陷生烃能力相对较弱。

According to an analysis of the data of temperatures and R_o in the Zhanhua depression of the Shengli oilfield, the R_o=04% is determined to be the R_o threshold of hydrocarbon (including immature or low-maturity oil/gas) generation in the area, and the depth threshold and temperature threshold corresponding to the new R_o average ～90℃ and ～2250 m respectively. The related factors responsible for the relatively low R_o value are organic components, temperature, fluid pressure and burial depth. By comparison, the Bonan and Gubei sub-depressions of the Zhanhua depression have a high hydrocarbon generating potential, while the potential of hydrocarbon generation of the Fulin sub-depression is relatively low.