致密油藏烃源岩有机碳含量预测方法研究

A Study on Prediction Method of TOC in Source Rocks of Tight Oil Reservoir

岩芯和岩屑样品的地化热解分析数据表明,吉木萨尔凹陷二叠系芦草沟组湖相烃源岩类型以Ⅰ型与Ⅱ型为主,总体有机质丰度较高。为了准确认识该区烃源岩特征并对其进行评价,利用岩芯地化分析资料标定测井信息,井震结合建立了适合研究区的烃源岩总有机碳横、纵向预测方法。纵向上研究采用声波电阻率模型、密度孔隙度模型及多元统计回归等多种方法计算烃源岩的有机碳含量,经对比选取适合的有机碳含量测井解释模型,在此基础上,基于多属性地质统计反演技术实现了烃源岩总有机碳含量的横向精确预测,从而较好的解决了其横向预测的难题;从研究区的预测效果来看,运用这套方法,取芯段的地化分析资料证明,该方法在研究区应用效果较好,为该区的井位部署提供可靠依据。

The geochemical analysis data of the core and rock debris samples show that high quality lacustrine source rocks are developed in Lucaogou formation of Middle Permian of Jimsar sag.To understand and evaluate source rocks,this paper develops proper horizontal and vertical predictive methods of the source rocks in this area. TOC of source rocks is calculated in portrait methods,such as acoustic resistivity superposition,DEN-porosity volume model and the multifactor statistical regression.Based on the comparison and selection of suitable organic carbon content,it is in logging interpretation model.The lateral accurate prediction of total organic carbon content of hydrocarbon source rocks is realized by the multi attribute geological statistics inversion technique to solve the problem of lateral prediction.From the prediction effect of the study area,we know the case study indicates is good for application,as can be a reliable basis for the design of wells in this area.