ZL油田位于鄂尔多斯盆地伊陕北斜坡东南部，区域构造为一平缓的西倾单斜，地层倾角小于1°，每公里坡降为7-10m，内部构造简单，局部可能由于差异压实作用形成的低幅度鼻状隆起；构造的稳定性和局部构造的不发育是本区构造的显著特征。 因此，本文从测井资料出发，结合钻井、录井、岩心、化验分析及其它地质资料，对油藏的构造、储层属性及其内部流体性质进行精细表征及综合研究；深入研究储层的岩性、物性、含油性及电性的特征，建立符合地质特点的“四性”关系，得到研究区储层的解释标准，为储量计算提供可靠的有效厚度、有效孔隙度、含油饱和度等主要计算参数，以满足油田生产开发的需要。 通过地层的划分和对比，开展研究区岩性和地层厚度的变化研究，查明油气层分布及连通情况，为寻找有利含油气区与合理开发油气田提供依据。根据地层叠置样式和沉积特征，长2段地层可划分为长21~长23 等3个沉积旋回。长2砂层组砂岩为灰色、灰白色、浅灰绿色，泥岩为深灰和灰色；发育平行层理和块状层理；沉积相类型为湖泊-三角洲相，三角洲前缘亚相，水上分流河道、河道侧翼、分流间湾微相；岩性为细粒长石砂岩；孔隙主要为粒间孔，其次粒内溶孔；孔隙度主要分布区间为2.19%~18.4%，平均值为12.8 %；渗透率主要分布区间为0.12~9.63×10-3µm2，平均值1.85×10-3µm2，储层为低孔、特低渗储层；长2储层为低含油饱和度储层；原始含油饱和度为33.0%，平均含水饱和度为65.0%。根据评价标准，可将延长组长2储层分为Ⅰ、Ⅱ、Ⅲ、Ⅳ四类，长2岩层主要发育Ⅲ类储层，为低孔、特低渗储层。

Zhiluo oilfield located in southeast of the Iraqi Erdos Basin in northern Shaanxi slope , constructed as a flat area west-dipping monocline dip less than 1°, per kilometer gradient of 7-10m , the internal structure is simple , local compaction may be due to differences in low amplitude formed nose uplift ; The significant feature of this area is constructed by structure stability and undevelopment of local structures. Therefore , this article from logging data , combined with drilling , logging , core , laboratory analysis , well logs and other geological data , To research the construction of reservoirs , reservoir properties and their internal fluid characterization and properties of fine- integrated ; deepen the Research of reservoir lithology, physical properties , oil resistance and electrical changes , and establishing the geological characteristics of the 4 properties relations , to explained the study area reservoirs standards for reserves to provide a reliable calculation of the effective thickness , effective porosity , other major oil saturation calculation parameters to meet the low permeability reservoir oil well logging reservoir evaluation from all of this to meet the needs of expandition of oil and gas exploration . By contrast strata division and an overview of the study area can mainly know stratigraphic sequence, facies changes in lithology and stratigraphic thickness , to identificate the reservoir distribution and connectivity , provide the basis for seeking favorable oil and gas areas and rational development of oil and gas fields . zhiluo oilfield chang2 section of sedimentary facies types is lakes - delta chang2 strata can be divided into chang21 to chang23 , etc. 3 sedimentary cycles . Chang2 sand sandstone gray , gray-green and dark gray mudstone ; developed parallel to bedding and massive bedding; lithology is fine-grained feldspathic sandstone ; porosity is mainly intergranular pores , followed by grain the solution pores ; mainly porosity range of 2.19% to 18.4% , with an average of 12.8% ; penetration mainly range of 0.12 ~ 9.63 × 10-3μm2 , the average of 1.85 × 10-3μm2, low porosity reservoirs, special low permeability reservoir; length 2 reservoir is low oil saturation of reservoir ; initial oil saturation was 33.0% , with an average water saturation of 65.0% . According to the evaluation criteria , can be divided into the reservoir of Yanchang Formation chang 2 Ⅰ, Ⅱ , Ⅲ , Ⅳ Four grades , chang 2 Class Ⅲ reservoir rocks are mainly developed for low porosity and very low permeability reservoir .