【摘要】 以层序地层学为依据,利用地震资料和测井信息,建立沉积相、地震相与暗色泥岩之间的关系,对南堡凹陷不同层序地层格架内泥岩、暗色泥岩的分布进行预测。在此基础上,利用测井资料识别有机碳含量的方法,通过统计不同体系域和不同沉积相带泥岩的烃源岩达标率,对南堡凹陷深层烃源岩的分布和厚度进行了预测与评价。结果表明,湖侵体系域和高位体系域下部是烃源岩发育的主要位置。SQ2暗色泥岩和烃源岩厚度占地层总厚度的比例最大,SQ5—SQ8和SQ9次之,但累积烃源岩厚度大体相当。并不是所有的暗色泥岩都可以成为烃源岩,烃源岩的分布与有机质的富集程度有关。更多还原

【Abstract】 Nanpu sag is a typical Cenozoic petroleum generative depression in Bohai Bay basin. It developed extensive lacustrine mudstone in Paleogene which is distributed within Es3, Es1 and Ed3 formation, and acts as an important material foundation of source rocks for mid-deep layer oil and gas formation. In view of shortage of well even no exploration well, we utilize the proven degree of exploration and subaerial data to predict the distribution of mudstone and dark mudstone depending on sequence stratigraphy and seismic stratigraphy theory. The approval rate that the TOC of source rocks >0.4% in mudstone strata at different depositional facies and architecture can be calculated by using the logging date for the early-stage prediction and evaluation of source rocks. The distribution of heavy mudstone is obviously controlled by depositional center migration on plan, and the distribution of dark mudstone is closely dependant on the sedimentation feature and storage conditions. However, not all the dark mudstones can generate hydrocarbon and the hydrocarbon source rocks mainly concentrated in the lacustrine transgressive systems and the bottom of high stand system in the SQ9, SQ5-SQ8, SQ4-SQ2. Especially,the hydrocarbon rocks of SQ2 of Shahejie formation are the most favorable and contribute greatly to the deep oil and gas concentration and development.更多还原