新沟油田致密油测井评价方法研究

Research on the Way of Tight Oil Logging Evaluation in Xingou Oilfield

新沟油田新下Ⅱ油组取心资料显示,储集层主要为泥质白云岩薄互层,具自生自储特点以及岩性复杂和薄互层等特征,给有效储集层划分和流体识别带来极大困难。利用岩心刻度测井模型交会图技术、多元统计分析法和岩石体积模型的最优化求解等方法进行研究,研究认为:多参数雷达图与交会图岩相识别方法、多矿物最优解与交会图致密油储集层脆性矿物计算方法,在该地区岩性识别效果较好。致密油储集层孔隙度计算方法,复杂岩性双侧向计算微裂缝渗透性、含油饱和度、TOC含量计算方法,能较好地满足新沟油田致密油储集层评价需求。

Coring data from Xinxia 2 formation in Xingou Oilfield shows that its reservoir stratum consists mostly of thin alternating argillaceous dolomite with its source and reservoir in the same bed. The properties of complex lithology and thin imerbed make it hard to classify reservoir strata and identify fluids by means of logging. On the basis of studies of crossplot technique of core calibration logging model, multivariate statistical analysis and optimized method for the solu- tion to rock volume model, the author believes that it could be better to adopt lithofacies identification method based on multi-parameter radar map and crossplot and computing method of brittle minerals in tight oil reservoir based on polymineral optimal solution and crossplot in carrying out lithology identification in Xingou Oilfield, and that computing method of porosity of tight oil reservoir and that of micro--crack permeability, oil saturation and TOContent based on calculation of dual side directions of complex lithology could meet the demand for evaluating tight oil reservoir in Xingou Oilfield.