摘要
沙河子组是徐家围子断陷致密气储层勘探的新层系,其内部发育的烃源岩具有很强的非均质,利用有限且离散的岩心(屑)分析数据不能客观评价烃源岩总有机碳含量(TOC)的实际分布特征。利用变系数Δlg R技术评价该区烃源岩,依据研究区系统取样的TOC数据重新厘定模型内的关键系数,建立了适合研究区的TOC预测公式,对全区35口井TOC进行测井计算,并将计算结果与传统Δlg R技术进行对比。结果表明,变系数Δlg R技术对研究区TOC的计算结果比较可靠,预测值与实测值的误差为19.6%,比传统Δlg R方法误差降低18.4%,证明了变系数Δlg R技术对断陷复杂地层TOC评价可行。
Shahezi group is a new field for tight gas exploration in Xujiaweizi fault depression.Source rocks in Shahezi group are characterized by strong inhomogeneity,so the total organic carbon(TOC)content can not be recognized effectively through finite and discrete core samples.To solve this problem,with the variable-coefficientΔlg R model and calculation of the key coefficient in the model using the sampled data,the TOC predicting formula for Anda area is established and applied to 35 wells,then compared the calculated results with those getting fromΔlg R model.The results show that TOCpredicting error by variable-coefficientΔlg R model is19.6%,reduced by 18.4% compared withΔlg R model.So,the variable-coefficientΔlg R model is feasible for TOCprediction of complex fault depression stratum.
出处
《测井技术》
CAS
CSCD
2016年第1期104-107,共4页
Well Logging Technology
关键词
测井评价
烃源岩
致密气储层
总有机碳含量
沙河子组
安达地区
徐家围子
logging evaluation
source rock
tight gas reservoir
total organic carbon
Shahezi group
Anda area
Xujiaweizi fault depression
