基于变系数ΔlogR技术的烃源岩TOC精细评价

发布时间：2018-04-23 15:08

本文选题：测井 + 烃源岩　；参考：《中国石油大学学报(自然科学版)》2017年04期

【摘要】：海拉尔盆地乌尔逊凹陷主力烃源岩层(南一段)烃源岩非均质性强,总有机碳(TOC)波动明显,利用有限的测试样品表征整套烃源岩层的生烃潜力具有较强的不确定性;烃源岩层的测井响应表现为高自然伽马、高声波时差、中等电阻率,易于识别,但是烃源岩测井评价参数的通用性差,难以建立起具有普遍适用性的TOC预测公式。针对上述问题,采用变系数ΔlogR技术评价该区烃源岩TOC,将ΔlogR技术中的经验参数视为待定系数,从模型参数地质意义出发,通过针对单井和"分区、分相"预测模型中的待定参数,完成全区120口井TOC测井评价,利用测井计算TOC实现烃源岩分级评价,通过"钻井定频率、层序定展布"的方法,得到南一段不同丰度级别烃源岩的厚度。结果表明,变系数ΔlogR技术预测TOC误差平均为16.6%,比传统方法平均降低19.9%;南一段差烃源岩厚度一般15~20 m,中等烃源岩厚度一般10~20 m,优质烃源岩的厚度一般20~45 m;南一段差烃源岩、中等烃源岩、优质烃源岩的体积分别为0.46×10~(11)、1.08×10~(11)和1.59×10~(11)m~3。
[Abstract]:The source rock of the main source rock of the Hailar basin, Hailar basin, has strong hydrocarbon source rock heterogeneity, and the total organic carbon (total organic carbon) fluctuates obviously. Using limited test samples to characterize the hydrocarbon generating potential of the whole source rock layer has strong uncertainty. The logging response of the source rock is high natural gamma, high acoustic wave time difference, medium resistivity, and easy to be easy. It is difficult to establish the general applicability of the TOC prediction formula for the evaluation parameters of hydrocarbon source rock. In view of the above problems, the variable coefficient Delta logR technology is used to evaluate the source rock TOC in this area, and the empirical parameters in the delta logR technology are considered as the undetermined coefficients. The undetermined parameters in the prediction model are used to evaluate the TOC well logging in 120 wells in the whole area. By using the log calculation TOC to evaluate the source rock classification, the thickness of the source rocks of different abundance levels in the south section is obtained through the method of "drilling fixed frequency and sequence distribution". The result shows that the variable coefficient Delta logR technique predicts an average of 16.6% of the error of the source rock, which is more than the traditional one. The method has an average reduction of 19.9%, the thickness of the source rock of the south one is generally 15~20 m, the thickness of the medium source rocks is 10~20 m, the thickness of the high quality source rocks is 20~45 m, the south one is differential source rock and the medium source rock, the volume of the high quality source rock is 0.46 * 10~ (11), 1.08 x 10~ (11) and 1.59 * 10~ (11) m~3. respectively.

【作者单位】：东北石油大学地球科学学院;东北石油大学非常规油气成藏与开发省部共建重点实验室;中国石油大学非常规油气与新能源研究院;中国石油勘探开发研究院西北分院;
【基金】：国家自然科学基金项目(41402110) 中央高校基本科研业务费专项(14CX05017A)
【分类号】：P618.13

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