【作者】 李志勇；

【导师】 郑浚茂；

【作者基本信息】 中国地质大学（北京） ， 矿产普查与勘探， 2009， 博士

【摘要】 论文以松辽盆地南部中央坳陷红岗油田红75区块下白垩统泉四段为研究对象,以沉积微相与储层特征研究为基础,以密闭取心井含油饱和度研究为中心,深入分析了密闭取心井各类含油饱和度研究方法及其优缺点,落实研究区含油饱和度分布特征,并进行控制因素分析,提出了有利的目标方向。通过区域沉积背景与沉积相标志相结合的研究,确定了研究区扶余油层属于辫状河三角洲沉积体系,三角洲前缘亚相可分为三角洲前缘主体、三角洲前缘末端2个区带。三角洲前缘主体储层物性好,孔隙度一般在8%以上,是有利的油气富集区带,其中1、2、6、10小层三角洲前缘主体较为发育。砂岩总体走势北北西～北西向,砂岩厚度高值区发育在研究区西北部和中部,向东南方向砂岩有逐渐变薄直至指状尖灭的趋势。储层物性与沉积相具有明显的相关性,孔隙度大于6%高值区除分布在工区西部外,主要发育在三角洲前缘主体部位两个北东向展布的条带中。储层的岩石类型为岩屑长石砂岩,储层平均孔隙度为8.21%、平均渗透率为0.256×10-3μm2,属于低孔特低渗、细喉～微喉型储层。论文采用密闭取心井红75-9-1井的密闭岩心直接测定、相渗及润湿性实验、压汞J函数法、核磁共振实验、常规测井、核磁共振测井等方法求取含油饱和度。对比分析表明:岩心实验求取含油饱和度在密闭性和蒸馏条件合格的前提下,密闭岩心直接测定评价油层饱和度是准确的;压汞实验J函数法、核磁共振实验法获得的是储层所能达到的最大饱和度,对于高饱和油藏的油层是适合的;相渗法和润湿性法由于实验目的原因不适合用来评价饱和度。而对于低饱和油藏、非饱和油藏及饱和油藏油水同层的评价,各类岩心实验求取的含油饱和度都会存在较大误差。测井法通过岩心刻度测井的方法求取饱和度不仅具有费用低、周期短的优势,同时也可以对低饱和油藏、非饱和油藏及饱和油藏中的油水同层进行饱和度评价,常规测井结合特殊测井系列综合评价含油饱和度可以获得较高的研究精度,特殊测井系列的核磁共振测井方法评价含油饱和度存在一定误差、尚在进一步探索中。应用常规测井方法对工区105口井进行储层划分、解释储层各类参数,落实了扶余油层12小层含油饱和度分布特征。研究显示含油饱和度分布与沉积微相有很好的相关性,含油饱和度大于40%的高值区主要发育在三角洲前缘亚相主体的水下分支河道微相中;同时,含油饱和度与孔隙度也具有极好的正相关性,含油饱和度大于40%的高值区多分布在孔隙度大于8%的高值区域内。通过对储层特征、沉积微相及含油饱和度分布特征等方面的综合评价,提出了H75-6～H75-8-26井一线及H75-37-25～H87-4～H88-2井一线是有利的滚动评价目标区域。更多还原

【Abstract】 This thesis, by taking Quan 4th member of Lower Cretaceous in Hong 75 block, Honggang oil field, central depression in south of Songliao basin as research object, based on the analysis of microfacies and reservoir characteristics, by taking research on SO in sealing coring well as study center, deeply analyzes the study methods of SO in sealing coring well and its pros and cons, confirms the distribution characteristics of SO in study area, analyzes its controlling factors and proposes the beneficial target.Based on the analysis of depositional setting and facies mark, the thesis ascertains that Fuyu oil layer develops braided delta and the subfacies of delta front can be divided into delta front body and delta front end. The delta front body has good physical property and its porosity is above 8%, it belongs to beneficial oil accumulation zone and delta front bodies of member 1,2,6,10 develop well. The sandstone of reservoir spreads NNW-NW. The high thickness of sandstone develops in northwest and center of the study area, and it changes thinner to dactylitic pinchout in the direction of southeast. The physical property of reservoir has apparent relationship with sedimentary facies.The area with high porosity over 6% mainly develops in delta front body, two belts spreading NE except for west of the study area.The main lithology is lithic arkose and the average porosity of reservoir is 8.21%, the average permeability is 0.256×10-3μm2, and the reservoir belongs to low porosity ultra-low permeability, slender throat-micro throat reservoir. According to directly measuring actual data from sealing coring H75-9-1, relative permeability and wettability experiment, mercury intrusion J function method, NMR experiment, rule logging and NMR logging, the thesis gets the SO. On the basis of comparative analysis, it indicates that we can directly measure and get the exact SO from the core experiment in acceptable leakproofness and distillation condition; we can get the max SO from mercury intrusion J function method and NMR experiment, which is adaptable for high-saturated oil reservoir; relative permeability and wettability experiment is unfit for evaluating SO. The SO from core experiment has big error for evaluating oil and water isostrate low-saturated, unsaturated and saturated oil accumulation. The method of using core calculating logging and getting SO costs little and has short cycle, also it can evaluate oil and water isostrate reservoir of low-saturated, unsaturated and saturated oil accumulation. Rule logging,combining with special logging method, evaluating SO can get high accuracy; While NMR logging, the special logging method has some error for evaluating the SO, and it needs further exploration.This thesis analyzes the SO distribution characteristics of 12 members of Fuyu oil layer, using rule logging method subdividing 105 wells of the study area, and interpreting different parameters of the reservoir. The research indicates that the SO has good correlation with sedimentary microfacies. The high-value area of SO over 40% mainly develops subaqueous distributary channel microfacies in delta front body; the SO and porosity also have good positive correlationship, and the high-value area of SO over 40% mainly develops in the area with porosity over 8%.Finally, based on comprehensive evaluation of reservoir characteristics, sedimentary microfacies and the SO distribution characteristics and so on, the thesis proposes beneficial roll extension targets, near the line of H75-6～H75-8-26,and the line of H75-37-25～H87-4～H88-2.更多还原