长岭断陷烃源岩分布特征研究

Distribution Characteristics of Hydrocarbon Source Rocks in Changling Fault Depression

根据样品测试及对烃源岩ΔlogR法测井评价,分层系分次级凹陷,对典型样品的TOC做了统计和评价,绘制了优质烃源岩连井剖面。结合单井烃源岩岩性组合与地震相的对应关系,总结出三种烃源岩収育层段岩性组合模式及其地震响应特征,再根据响应的地震响应特征反推出烃源岩分布特征,绘制了营城组、沙河子组和火石岭组的烃源岩分布图。结果表明,长岭断陷营城组烃源岩分布范围广,面积大,质量高;沙河子组烃源岩主要分布在各个次级洼陷的中心,分布范围较为有限,烃源岩质量不如营城组的好,且有些次凹有较强的的非均质性;火石岭组烃源质量较差,分布也最为局限,主要受控于活动时间较早、觃模较大的控陷断裂。

According to sample testing and evaluation of hydrocarbon source rocksbyusingΔlogRmethod,typical TOC sampleswerecounted indifferentstratum andsecondary recess.Some quality source rockseven well profilewas drawn.Combined with the correspondence between source rockcombined modein lithology with seismic facies,three kinds of hydrocarbon source rocks intervals lithological model and its seismic response characteristicsweresummed up.Thedistributionpicturesof hydrocarbon source rocksinYingcheng,ShaheziandHuoshilingwere obtained.The results showthatYingchengsource rocksin Changlingfault depressionhavewide distribution, large area, high quality;Shahezisource rocksmainly distributein the center of each sub-sag,havemore limited distribution rangeandarenot as good qualityofsource rocksasYingcheng. And some secondarydepressionshave a strong concave heterogeneity. Source rocksinHuoshilinghavepoor quality,themost distributionlimitationwhichwascontrolledbylarge-scale’s deep faults.