渤海盆地辽东湾地区古近系烃源岩成熟演化模拟

古近系是辽东湾地区的主力烃源岩层系, 包括孔店组(Ek)-沙河街组四段(Es⁴)、沙河街组三段(Es³)、沙河街组一、二段(Es1-2)、东营组三段(Ed³)4套烃源岩, 它们主要分布在该地区的3个凹陷(辽西、辽中和辽东)的各个次洼中。在沉积和构造发育史的基础上, 结合烃源岩地球化学和热史等参数对烃源岩成熟演化进行模拟。对辽中凹陷各洼陷典型井区的烃源岩演化模拟表明辽中凹陷不同洼陷内各烃源岩层系的成熟演化历史存在明显差异:在东营组沉积末期，Es⁴-Ek烃源岩普遍进入生油门限，现今，基本上处于高-过成熟阶段；在馆陶组沉积末期，Es³和Es^-2烃源岩普遍进入生油门限，Ed³烃源岩部分进入生油门限，现今，Es³和Es^-2烃源岩在辽中凹陷的部分地区达到生油高峰期。同时, 利用Basinview软件模拟了辽东湾地区古近系4套烃源岩的成熟演化历史, 表明在盆地演化过程中同一套烃源岩在辽东湾地区不同凹陷进入生油门限和达到生油高峰及生气阶段的时间存在差异。研究成果可以为该地区深凹区的烃源岩预测与评价和计算烃源岩体积、生、排烃量等提供重要参数，这对指导该地区的油气资源勘探具有重要意义。 

Simulation of Maturity Evolution of Paleogene Source Rocks in Liaodong Bay, Bohai Basin

The main source rocks is Paleogene,including Kongdian Formation(Ek)-Member 4 of Shahejie Formation(Es4),Member 3 of Shahejie Formation(Es3),Member 1-2 of Shahejie Formation(Es1-2) and Member 3 of Dongying Formation(Ed3) in Liaodong Bay,Bohai Basin.They are mainly distributed in several sub-sags in three sags(Liaoxi,Liaozhong and Liaodong) in the region.Based on the depositional and tectonic development history,with combination of geochemical and thermal parameters,etc.,maturity evolution of source rock is modeled.The results of typical wells show that it exhibits an obvious difference among sub-sags in Liao-zhong sag.The maturity evolution history modeled by Basinview software also shows that there are different times to reach thresholds of oil generation and oil generation peak and gas generation phases for the same set of source rock in different sags: Es4-Ek source rocks entered threshold of oil generation during the end of Dongying Formation deposition period generally and they are up to high-over maturity phase now;Es3、Es1-2 and part of Ed3 source rocks entered threshold of oil generation during the end of Guantao Formation deposition period generally,Es3 and Es1-2 source rocks are up to oil generation peak phase in part of Liaozhong sag now.The results of this paper can provide important parameters in prediction and evaluation of source rock,calculation of volume of source rock,and the amount of hydrocarbon generation and expulsion,thus it has a guiding significance for petroleum exploration in this region.