应用地球物理技术定量评价辽西凹陷沙河街组烃源岩

doi:10.13810/j.cnki.issn.1000-7210.2017.01.018

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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。

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关键词 ：地球物理, 辽西凹陷, 沙河街组, 烃源岩, 定量评价

Abstract：Aiming at the source rocks of Shahejie formation in Liaoxi Sag,Liaodong Bay,a quantitative prediction method based on geophysical approaches is proposed.First of all,on the basis of the core geochemical analysis data,total organic carbon (TOC) curve is generated by logging interpretation.Secondly,through petrophysical analysis,a parameter sensitive to TOC is found,and the fitting formula between them is revealed.Thirdly,sensitive parameter volume is obtained by seismic inversion,and then is transferred into TOC data volume with fitting formula.As a result,in accordance with the evaluation indices,the distribution and level of source rocks are predicted,and the quantity of generated hydrocarbon is calculated with geochemistry and basin model parameters.Our application indicates as follows:There is a set of good quality source rocks with more than 2% of TOC and the average thickness of 200m in the area;the predicted hydrocarbon resources are close to 2.6 billion tons; and the relative error between the predicted thickness and actual thickness of source rocks is less than 10%.It is concluded that geophysical approaches can be used to quantitatively evaluate source rocks as a meaningful reference for similar sags.

Key words： geophysics Liaoxi Sag Shahejie formation source rocks quantitative evaluation

收稿日期: 2016-01-22

P631

通讯作者: 牛聪,北京市朝阳区太阳宫南街6号院A-1003室,100028。Email:niucong@cnooc.com.cn E-mail: niucong@cnooc.com.cn

作者简介: 牛聪,高级工程师,博士研究生,1980年生;2006年毕业于成都理工大学,获信号与信息处理专业硕士学位,2013年起在中国地质大学(北京)攻读地球探测与信息技术专业博士学位;现在中海油研究总院主要从事油气地球物理勘探技术研究。

引用本文:

牛聪, 刘志斌, 王彦春, 张益明, 解吉高, 黄饶. 应用地球物理技术定量评价辽西凹陷沙河街组烃源岩[J]. 石油地球物理勘探, 2017, 52(1): 131-137. Niu Cong, Liu Zhibin, Wang Yanchun, Zhang Yiming, Xie Jigao, Huang Rao. Quantitative evaluation of Shahejie formation source rocks in Liaoxi Sag with geophysical approaches. OGP, 2017, 52(1): 131-137.

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http://www.ogp-cn.com/CN/10.13810/j.cnki.issn.1000-7210.2017.01.018 或 http://www.ogp-cn.com/CN/Y2017/V52/I1/131

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