ZL油田位置处于鄂尔多斯盆地东部斜坡带，是一平缓的西倾单斜。它具有典型低孔、低渗油气藏特点，纵向分布跨度大，层位多，差异性大，非均质性强，并且储集类型多样。储层内部非均质性对孔隙流体通道、油气采收率有很大的影响；为寻找更好的开发方案，选择有效的排驱方法和完井方法，有必要进行储层非均质性研究。它可以为剩余油的分布提供参数依据，也能够为下一步新勘探区含油区层位做出较准确的预测，对油气开发效果后续改善工作和提高油气采收率有重要意义。 本文从钻井、录井、岩心、化验分析及其它地质资料，结合测井资料，对ZL油田三叠系延长组长2、长6地层进行精细划分与对比；通过储层岩石学特征包括岩石类型、岩性、结构，孔隙度结构，物性，敏感性等特征来研究延长组储层特征；并利用储层渗透率系列参数、层内夹层、层间隔层、分层系数等深入研究分析长2、长6储层层内、层间、平面非均质性特征，并进行延长组不同段的储层非均质性特征对比。 通过研究，将ZL油田长2储层划分为长21、长22、长23三个小层；长6储层划分为长61、长62、长63、长64四个小层。长2储层以粒间孔为主，平均孔径58μm，孔隙度平均值为12.8%；平均渗透率为1.85×10-3µm2，为中低孔低渗储层；长6储层以粒间孔、溶孔为主，平均62.66μm，孔隙度平均值为10.3%；平均渗透率为0.72×10-3µm2，是中低孔特低渗储层。长2储层层内非均质性强于长6储层层内非均质性，层内渗透率以正韵律为主，夹层以泥岩夹层为主。长6层间非均质性强于长2层间非均质性，长6分层系数大，正韵律为主，夹层以泥岩夹层为主。长2储层平面非均质性强于长6储层平面非均质性，长2储层平均砂层钻遇率83.5%，长6储层平均砂层钻遇率84.3%，长6平面连通性好，渗透率平面变化范围大。

ZL oilfield locates in the Ordos basin eastern slope zone which is a gentle western-leaning monoclinic. It is a typical low porosity and low permeability reservoir, with the characteristics of large vertical distribution span, various strata, much difference type, strong heterogeneity, and various reservoir types. Reservoir internal heterogeneity had a great influence on pore fluid and oil recovery. For searching for the better development programs and choosing an effective method of expulsion and completion methods, it is necessary to do research work on reservoir heterogeneity which could provide more accurate parameters for the residual oil distribution, and have an important guiding for the next step exploration prediction and oil recovery enhancement of oil-bearing layers in new area. Based on the drilling, mud logging, core, laboratory analysis and other geological data, combining with the well logging data, stratigraphy of Chang2 and Chang6 in ZL oilfield are detailedly divided and correlated. Yanchang formation characteristics have been analyzed from the petrologic features including rock types, lithology, porosity structure, physical property and sensitivity. Using reservoir permeability parameters, interlayers, bay level, stratification coefficient, the in-layer, interlayer and plane reservoir heterogeneity of Chang2 and Chang6 have been studied, and the heterogeneity feature comparison of different oil-bearing layer is done. The results show that, Chang2 reservoir in ZL oilfield is divided into three small layers of Chang21, 22, 23; Chang6 reservoir is divided into four small layers of Chang61, 62, 63, 64. Chang2 reservoir belong to a low porosity and low permeability reservoir, and its pore type is mainly intergranular pore with average pore diameter of 58μm, average porosity of 12.8% and average permeability of 1.85×10-3μm2. Chang6 reservoir belong to ultra-low permeability reservoirs, and its pore type is also mainly intergranular pore with average pore diameter of 62.66μm, average porosity of 10.3% and average permeability of 0.72×10-3μm2. The in-layer heterogeneity of Chang2 reservoir is stronger than Chang6. Chang2 is given priority to positive rhythm and mud interlayer. The interlayer heterogeneity of Chang6 reservoir is stronger than Chang2，and Chang6 has a large stratification coefficient and is given priority to positive rhythm and mud interlayer. The plane heterogeneity of Chang2 reservoir is stronger than Chang6, Chang2 reservoir sand drill encounter rate is about 83.5% , Chang6 reservoir is about 84.3% in sand drill encounter rate, Chang6 has a good plane connectivity, but the permeability distribution in plane is in a large range.