应用地球物理技术定量评价辽西凹陷沙河街组烃源岩

发布时间：2019-03-16 12:27

【摘要】：针对辽东湾辽西凹陷沙河街组烃源岩,提出了一种基于地球物理技术的定量评价方法。首先在岩心地化分析数据的基础上利用测井解释方法进行总有机碳含量(TOC)预测;接着利用岩石物理分析得到与TOC具有强相关性的地球物理敏感参数,进而拟合两者的关系方程;然后通过地震反演预测地球物理敏感参数数据体,并由拟合关系将其转换为TOC数据体;最后按照烃源岩的质量评价指标,预测不同等级烃源岩的空间分布,并与盆地模型参数相结合计算目标凹陷的生烃量。实际应用表明,研究区沙河街组存在一套TOC大多为2%以上、平均厚度可达200m的优质烃源岩,估算其油气资源量约为26亿吨,该方法预测的烃源岩厚度与实测值的相对误差小于10%。研究结果说明,利用地球物理技术可以实现对烃源岩的丰度分级和定量评价,对类似生烃凹陷的评价具有参考价值。
[Abstract]:In view of the source rocks of Shahejie formation in Liaoxi depression, Liaodong Bay, a quantitative evaluation method based on geophysical technique is proposed. Firstly, the (TOC) prediction of total organic carbon content is carried out by logging interpretation method on the basis of core geochemical analysis data. Secondly, the geophysical sensitive parameters which have strong correlation with TOC are obtained by petrophysical analysis, and then the equation of relation between them is fitted. Then the geophysical sensitive parameter data volume is predicted by seismic inversion and converted into TOC data volume by fitting relation. Finally, according to the quality evaluation index of source rocks, the spatial distribution of different grades of source rocks is predicted, and the hydrocarbon generation amount of target sags is calculated by combining with basin model parameters. The practical application shows that there is a set of high quality source rocks with TOC of more than 2% and average thickness of 200 m in Shahejie formation of the study area, and the oil and gas resources of the source rocks are estimated to be about 2.6 billion tons. The relative error between the thickness of source rock predicted by this method and the measured value is less than 10%. The results show that geophysical techniques can be used to classify and quantitatively evaluate the abundance of source rocks and have reference value for the evaluation of similar hydrocarbon-generating sags.
【作者单位】：中国地质大学(北京)地球物理与信息技术学院;中海油研究总院;
【分类号】：P618.13;P631

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