西区油田长7油藏油气分布规律研究

发布时间：2018-08-28 13:34

【摘要】：本文以多学科地质理论与方法技术为指导,充分利用钻井、录井、测井、实验分析及试油试采等资料,密切结合油田实践,从构造、沉积、储层等因素对西区油田长7油藏油气分布规律进行深入的研究。依据标志层及旋回组合,将长7油层组划分为长71、长72、长73三个小层,并对其进行精细划分与对比,查明了小层顶面构造特征,总结了沉积微相类型及其平面展布特征,概括了其储层岩性、物性、非均质性特征以及分类评价,综合分析了其油气分布特征及影响因素。研究结果表明,西区油田长7地层发育完整,厚度基本稳定;构造整体自西向东依次抬高,局部呈东西向的低幅度鼻隆构造及穹隆构造;发育浊积中、下扇沉积,微相类型主要有浊积水道、浊积漫流、浊积末梢、深水盆地,相带整体呈南北向带-扇状展布;储层岩石类型主要为长石粉细砂岩,平均孔隙度为8.86%,平均渗透率为0.31×10-3μm2,属于低孔超低渗透储层,钙质含量对储层物性影响大,层内渗透率变化大,非均质性强,储层类型以II类为主。油层多呈透镜状分布,连片性差,纵向上主要分布在长71和长72小层,平面上主要分布在北部及南部。浊积水道控制了优势砂岩储层及含油层的空间展布,顶面构造的起伏变化亦对油水的相对分异及油气局部富集具有一定影响,油藏类型主要为岩性油藏。
[Abstract]:Under the guidance of multidisciplinary geological theory and technique, this paper makes full use of the data of drilling, logging, experimental analysis and production test and production testing. The oil and gas distribution of Chang7 reservoir in Western Oilfield is studied deeply by reservoir and other factors. According to the marker layer and cyclic assemblage, Chang7 oil formation is divided into three sub-layers, Chang71, Chang72and Chang73, and the fine division and correlation are carried out, the structural characteristics of the top surface of the substrata are found out, and the types of sedimentary microfacies and their plane distribution characteristics are summarized. The lithology, physical property, heterogeneity and classification evaluation of the reservoir are summarized, and the oil and gas distribution characteristics and influencing factors are comprehensively analyzed. The results show that Chang7 formation in Western Oilfield is intact and stable in thickness, the whole structure is elevated from west to east in turn, the local low-amplitude nasal uplift and dome structure are east-west, and the turbidite is developed in the middle and lower fan deposits. The microfacies types are mainly turbidite channel, turbidite diffuse flow, turbidite endings, deep water basin, and the whole facies belt is distributed in the south and north direction, the reservoir rock type is mainly feldspar siltstone fine sandstone, The average porosity is 8.86 and the average permeability is 0.31 脳 10 ~ (-3) 渭 m ~ (2), which belongs to the low porosity and ultra-low permeability reservoir. The calcium content has a great influence on the physical properties of the reservoir, the permeability changes greatly and the heterogeneity is strong. The main reservoir type is II. Most of the oil layers are lenticular and poor in continuity. The longitudinal distribution is mainly in Chang71 and Chang72, and the plane is mainly in the north and south. The turbidite channel controls the spatial distribution of the dominant sandstone reservoir and the oil-bearing layer, and the fluctuation of the top structure also affects the relative differentiation of oil and water and the partial enrichment of oil and gas. The reservoir type is mainly lithologic reservoir.
【学位授予单位】：西安石油大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：P618.13

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