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冀中坳陷廊固凹陷烃源岩埋藏深,钻井分析资料较少,利用常规地球化学方法难以系统分析优质烃源岩的平面、剖面分布特征。以现有的钻井取心样品及有机地球化学资料为基础,利用测井曲线叠合法建立了廊固凹陷测井资料计算总有机碳的经验公式,计算结果与实测值符合率可达80%～90%;据此选取了测井数据全、暗色泥岩发育并具有代表性的井,建立了廊固凹陷烃源岩分布评价标准,进而分析了廊固凹陷沙河街组沙三段与沙四段烃源岩的平面、剖面分布特征。研究表明,廊固凹陷主要发育巨厚的中等—低质量烃源岩,优质烃源岩主要发育于湖侵体系域;新发现固安优质烃源岩发育区,对下一步分层系开展精细勘探,寻找岩性油气藏具有重要的指导意义。
The source rocks in the Langzig Sag of the Jizhong Depression are buried deep with few drilling analysis data. It is difficult to systematically analyze the distribution characteristics of the plane and profile of the high-quality source rocks by conventional geochemical methods. Based on the existing drilling coring samples and organic geochemical data, an empirical formula for calculating total organic carbon from log data of Langgu Sag was established by means of log curve superposition method. The calculated result accords with the measured value up to 80% 90%. Based on this, well logging data, dark mudstone development and representative wells were selected to establish the evaluation criteria of source rock distribution in the Langgu Sag. Then the distribution of the source rocks in Shagujie Formation in the Langgu Sag was analyzed. Plane and section distribution of source rocks. The study shows that the Langgu Sag develops mainly of medium-low-quality source rocks with high-quality source rocks mainly developed in the lacustrine system tract. The newly discovered Gu’an high-quality source rock development zones are well developed for further stratification Exploration, looking for lithologic reservoirs has an important guiding significance.