孙吴—嘉荫盆地太平林场组烃源岩海侵特征研究

太平林场组作为孙吴—嘉荫盆地最重要的生烃层位，与松辽盆地海侵层位嫩江组具有很好的可比性。对该盆地萝北剖面和黑龙江剖面的常量元素、微量元素、同位素以及有机地球化学分析表明，太平林场组底部沉积时为高盐度强还原的水体环境，这与嫩江组早期的海侵咸化水体特征一致，且向上具有水体盐度及还原性降低趋势。综合前人研究中的古气候，古生物等方面证据，认为在早白垩世，孙吴—嘉荫盆地为松辽古湖盆一部分，太平林场组与嫩江组为同一湖盆沉积，且遭受了海侵。太平林场组烃源岩地球化学特征反映其沉积保存环境有利于有机质的富集、保存及转化成烃，可为该区油气生成提供物质基础。

Geochemical Characters of Source Rock from Taipinglinchang Formation in Sunwu-Jiayin Basin

As the important source rock layers in Sunwu Jiayin basin, Taipinglinchang Formation can be compared with Nenjiang Formation well that suffered the transgression. The analysis of major element, microelement and isotope indicate that the characters of high salinity and strong reduction at the bottom of Taipinglinchang Formation are in consistence with the characters of Nenjiang Formation. There is the upwards decreasing trend in salinity and reduction. In addition to the palaeoclimate and palaeobiology, it is believed that Sunwu Jiayin basin was the part of big Songliao basin in the early Cretaceous. Taipinglinchang Formation and Nenjiang Formation deposited in the same lake and suffered the transgression. The sedimentary circumstance of Taipinglinchang Formation is ideal for the organic matter accumulation and transferring to hydrocarbon in the source rock, which provide the material foundation of oil and gas generation.〗