鄂尔多斯盆地义正中南部延长组长6油藏储层物性特征及其测井解释模型

THE PHYSICAL PROPERTIES ANG WELL LOGGING INTERPRETATION MODEL ESTABLISHMENTFORCHANG 6SECTION OFYANCHANG FORMATION IN CENTRAL SOUTHERN YIZHENG REGION OF ORDOS BASIN

鄂尔多斯盆地义正中南部地区钻井较少,该区延长组长6油层组沉积环境复杂,油藏岩性、物性变化大,非均质性强,随着勘探开发的进展,急需对油藏进行精细分析,研究其物性特征并建立物性解释模型。基于该区及邻区岩心分析物性数据发现该区孔隙度、渗透率变化大,说明该区储层孔隙结构复杂,非均质性强。研究发现岩心物性分析数据归位后与测井响应相关性较好,可以分别运用声波时差曲线与实测孔隙度层点值回归拟合法及孔隙度-渗透率层点处理拟合法建立孔隙度及渗透率解释模型。经验证,模型在研究区应用效果较好。

There are less wells in central southern Yizheng region of Ordos Basin.Chang 6 formation,which is in the region, has complex sedimentary environment, variational lithology and physical properties, and strong heterogeneity. In order to catch up with the development of exploration and exploitation of the reservoir, it is urgent to make fine reservoir analysis, study its physical properties and establish the logging interpretation model. Therefore, based on the mass data of core analysis, we can conclude that the variation ranges of the porosity and permeability in Chang6 section are all large, which indicates that the pore structure of the reservoir is complex. After the study it is found that the physical properties of core data analysis have good correlation with log response, therefore acoustic transit time logging curve and the measured porosity layer point value regression can be used to establish porosity interpretation model, porosity and permeability layer point value regression can establish permeability interpretation model. The model is proved to be effective, and meets the needs of reservoir evaluation.