SOURCE ROCK EVALUATION OF TAIZHOU FORMATION IN HAIAN SAG, NORTHERN JIANGSU BASIN
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摘要: 苏北海安凹陷泰州组烃源岩质量、勘探潜力问题紧紧困扰着地质工作者.在密集取样分析并结合前人分析化验资料的基础上,建立海安凹陷泰州组烃源岩地球化学剖面,对烃源岩进行综合评价,并用成因法对泰州组资源量进行预测.研究表明,泰州组二段中上部的暗色泥岩对油气成藏作用不大;泰州组二段底部的泥灰岩段泥岩、泥灰岩有机碳含量平均为2.32%,干酪根为腐泥型和以腐泥为主的混合型,处于低成熟-成熟阶段,为一套优质烃源岩;海安凹陷剩余地质储量、可采储量分别为4242×104,1358×104t,具有一定的勘探前景.Abstract: Source rock quality and exploration potential of the Taizhou Formation in the Haian Sag of the Northern Jiangsu Basin have puzzled geologists.Based on sampling analyses,organic geochemical profile of the formation has been set up.Source rocks are evaluated and exploration potential is predicted.Dark mudstone in the middle and upper section of the 2nd member of Taizhou Formation is not very contributory for reservoir.As to mudstone and muddy limestone at the bottom of the 2nd member of Taizhou Formation,average organic carbon content is high(2.32%).Kerogen is sapropel type or mixed type mainly composed of sapropel.It is in the low maturity to maturity stage and is a set of excellent source rock.Reserve of the Haian Sag is 4 242×104 t,and remnant recoverable reserve is 1 358×104 t,indicating good exploration prospect.
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Key words:
- geochemical characteristics /
- source rock /
- evaluation /
- Taizhou Formation /
- Haian Sag /
- Northern Jiangsu Basin
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