胶莱盆地莱阳凹陷莱阳组烃源岩生烃史研究

胶莱盆地莱阳凹陷为一典型的中生代残留凹陷。长期以来，由于对该凹陷烃源岩生烃史认识不清，给勘探潜力评价带来不利影响。应用生烃动力学方法，对该凹陷莱孔2井2块典型烃源岩生烃动力学参数及烃源岩生烃史进行了研究，结果表明：莱阳凹陷在地史时期存在2个生油峰期，第1期出现在90～75Ma，主要烃源岩是位于莱阳凹陷中心的逍仙庄段烃源岩，生油范围较小；第2期出现在75～65Ma，生油范围广，包括凹陷内的水南段烃源岩及斜坡带的逍仙庄段烃源岩，为主生油期。认为莱阳凹陷圈闭构造主要形成期与烃源岩主生烃期基本吻合，但由于后期构造破坏，莱阳凹陷的勘探重点应放在有较好储盖组合、未受明显构造变动的残存凹陷。

PETROLEUM-GENERATING HISTORY OF SOURCE ROCKS IN THE LAIYANG FORMATION FROM THE LAIYANG DEPRESSION, JIAOLAI BASIN

The Laiyang depression of the Jiaolai basin is a typical Mesozoic residual depression. The attention to the petroleum-generating history of the source rocks has less paid, and is nor favorable to the petroleum exploration of this basin. In this context, the petroleum-generating kinetics parameters of two typical source rocks from the LK2 Well and the petroleum-generating history of the source rocks are investigated based on the kinetics method. The results show that two peaks of oil generation for the source rocks exist. The first peak occurred during 90-75 Ma, and the oil was mainly derived from the source rocks in the Xiaoxianzhuang section only distributed in the depression center area. The second peak occurred during 75-65 Ma and, and petroleum generation with large scale happened in the source rocks of the Shuinan and Xiaoxianzhuang sections. The period of trap structure formation was largely corresponding to that of petroleum generation. However, the exploration targets should be the depression inside area where the reservoir-cap rock association is developed well and the structure has preserved, owing to the structure destruction during the late tectonic movements. This result will provide an important guide to the petroleum exploration in the Laiyang depression.