渤海海域前第三系烃源岩评价

Pre-Tertiary Bohai Sea Hydrocarbon Source Rock Evaluation

为了研究渤海海域前第三系的烃源岩特征,对前第三系烃源岩的有机质丰度、有机质类型及有机质成熟度等指标进行评价.结果表明：震旦系60％的烃源岩进入了成熟带,但生烃潜力较差;古生界寒武—奥陶烃源岩除C油田之外,石碳—二叠系除了埕北及渤海西部地区之外,生烃能力较差;中下侏罗统烃源岩镜质体射率为0.5～0.6,有机碳含量较高,总烃含量比较大,生烃潜力较好;白垩系下统烃源岩有机质丰度较高,处于低成熟阶段,生烃潜力优于中下侏罗统和石碳—二叠系地层;石炭系—二叠系、中下侏罗统及白垩系下统三套地层是前第三系烃源条件较好的地层.

In order to study the characteristics of pre - Tertiary hydrocarbon source rocks, the abundance of organic matter, organic matter type and maturity of organic matter and other indicators are evaluated. The evaluation shows that 60% of the sinian into a mature source rock band, but most hydrocarbon potential is poor. Paleozoic cambrian ordovician hydrocarbon source rocks except C fields, the carboniferous - permian except the courtyard outside the north and the Bohai sea in the western region, less capable of hydrocarbon generation; in lower Jurassic source rocks Ro values between 0.5 and 0.6, organic carbon content is high, and the total hydrocarbon content is relative- ly large, with good hydrocarbon potential. Cretaceous source rocks under the EC has high abundance of organic matter, in low -mature stage, whose hydrocarbon potential is better than the lower Jurassic and carboniferous - permian strata. By comparing the results, carboniferous - permian, jurassic and lower cretaceous strata under the former system are the best conditions Tertiary hydrocarbon source strata.