摘要
指出研究地质历史时期沉积的微生物碳酸盐在石油勘探方面具有3个重要的意义,一是微生物碳酸盐可作为古环境和古气候的良好指示,有利于古地理重建;二是可通过分析微生物碳酸盐沉积的生物标志化合物特征评价有机质类型;三是可通过研究微生物碳酸盐中有机质的保存情况评价生烃能力。通过对微生物碳酸盐的发育条件和油气成藏模式的分析认为,发育在斜坡沉积环境中的含微生物碳酸盐建造和纯微生物碳酸盐建造不但可以成为油气储层,而且还可以作为生油气层之一,其中以生物礁为主,微生物碳酸盐为辅的地层,因靠近海相烃源岩地层或直接被海相油页岩覆盖,在海侵体系下极易形成良好的盖层,具备良好的油气成藏潜力。建议在我国南方海相碳酸盐岩地层油气勘探中加强微生物碳酸盐的研究,可为探寻我国的海相油气地层提供新的勘探途径和方法。
Microballtes are associated with late transgressive to highstand systems tract deposits and sediment starvation surfaces and hardgrounds. It is of importance to study microbialites because of three reasons as follows： microbialites can be used as a better indicator matter of palaeoenvironment and palaeoclimate ; the pattern of organic matters can be evaluated by analyzing their biomarkers in formations the hydrocarbon-generating ability of source rock can be assessed by analyzing organic matters in microbialites.
The formation containing microbialites or carbonate microbial crusts which formed on the inner ramp is commonly close to marine source rock or directly overlaid by marine oil shale. Therefore, when argillaceous beds immediately overlying the grainstone and packstone reservoir serve as the seal rocks, this kind of strata will be apt to become better traps if the caprock has a good seal ability. If microbial buildups coexist with reefs especially coral reefs, the coefficient of permeability and the porosity of the microbial reef buildups could be elevated greatly. Research on the microbialites and carbonate microbial crusts in sedimentary basin provides new ideas for petroleum exploration and trap forecasting.
出处
《天然气地球科学》
EI
CAS
CSCD
2007年第4期522-526,共5页
Natural Gas Geoscience
基金
中国科学院"百人计划"项目
国家自然科学基金项目(编号:40472067)
国家自然科学基金项目(编号:40572072)
中国科学院边缘海地质重点实验室基金项目(编号:MSGL0601)联合资助
