子长油田子128井区长6储层非均质性及其影响因素

Heterogeneity of Chang 6 Reservoir in Zi 128 Wellblock of Zichang Oilfield and Its Controlling Factors

针对子长油田子128井区长6油层组储层孔隙结构复杂、稳产率不高等问题,综合分析地质资料、测井资料,利用压汞实验、铸体薄片、扫描电镜等方法,深入探讨研究区长6油层组储层非均质性及其影响因素。结果表明,长6油层组的层内和层间非均质性自上部地层至下部地层逐渐增强,而平面非均质性逐渐减弱。沉积微相和成岩作用对储层非均质性具有控制作用,单期分流河道宽度变化越大、多期河道叠加宽度越小,储层非均质性越强。成岩作用对储层非均质性的影响利弊兼具。

The pore structure of Chang 6 formation in Zi 128 wellblock of Zichang oilfield is complex and the stable production rate is not high.Therefore,the reservoir heterogeneity of Chang 6 oil formation in the study area and its influencing factors are deeply discussed by comprehensively analyzing geological data and logging data,using mercury injection test,cast thin section,scanning electron microscope and other methods.The results show that the intralayer and interlayer heterogeneity of Chang 6 oil-bearing formation gradually increases from the upper to the lower,while the plane heterogeneity gradually decreases.Sedimentary microfacies and diagenesis control reservoir heterogeneity.The greater the change of single-stage distributary channel width and the smaller the superposition width of multi-stage channels,the stronger the reservoir heterogeneity.Diagenesis has both advantages and disadvantages on reservoir heterogeneity.