OVERALL EVALUATION BY MULTI-PARAMETERS ON MATURITY OF CRUDE OIL FROM THE BOZHONG SAG,THE BOHAI BAY BASIN
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摘要: 成熟度是表征原油与烃源岩有机质演化阶段的地球化学参数,是进行油-源对比的基础,所以其评价方法显得很重要.利用轻烃、芳烃及甾萜类成熟度参数对渤海湾盆地渤中凹陷主要含油气构造第三系原油进行了综合分析,按照成熟度的相对高低,将其划分为高成熟凝析油和成熟原油:前者主要分布在渤中凹陷的西南部,表现为高石蜡指数(PI12)和高甲基菲比值(F1,F2);其它区域的则属于成熟原油,具有与前者相反的参数特征.对于未遭受生物降解作用的原油成熟度评价,PI1-PI2、F1-F2的使用效果较好.原油成熟度的差异性也反映了渤中凹陷的油源存在多源性,成藏存在多期性.Abstract: Maturity is the geochemical parameter that shows the relationship between crude oil and evolution stage of organic matter of source rock,which is the base of oil-source correlation,so evaluating method is very important.Effective appraisal range and applying condition need to be considered to use maturity parameters.Through overall evaluation on maturity by parameter of light hydrocarbon,aromatic hydrocarbon and sterane terpane,according to the relative high or low of maturity,the Tertiary oils in the Bozhong Sag of the Bohai Bay Basin are divided into two kinds:high-mature condensate oil and mature oil.High-mature condensate oil has high paraffin index,heptane value and methyl phenanthrene ratio,which mainly distribute in the southwest of the sag.Mature oil has contrary parameter characteristic.The result also shows there are multi-fountain source and multi-period reservoir in the Bozhong Sag.
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Key words:
- oils /
- maturity parameters /
- integrated evaluation /
- Tertiary /
- Bozhong Sag /
- Bohai Bay Basin
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