安塞油田化子坪南区长6油层组“四性”关系及油藏特征研究

发布时间：2018-03-15 05:20

  本文选题：安塞油田　切入点：长6油层组　出处：《西北大学》2015年硕士论文　论文类型：学位论文

【摘要】：化子坪南区是安塞杏子川采油厂勘探新区块,近年来该区块陆续进入开发阶段。由于化子坪南区渗砂体分布和微相展布未做精细刻画研究,同时对该区域储层岩性、电性、含油情况以及油藏特征认识不够深入,严重制约了研究区石油开发与进一步的勘探工作。针对该现状,对该区块进行地质精细刻画、储层“四性”关系以及油藏特征研究是非常必要的。本文以石油地质学、储层沉积学等多门地质学科为指导,在钻井、测井及录井、分析测试资料以及试油试采资料的基础上,对化子坪南区沉积相展布、储层特征、储层“四性”关系及油藏特征进行研究,并总结了该区域油藏控制因素。化子坪南区构造上表现为平缓的西倾单斜,发育2个宽缓鼻状隆起。长6油层组发育三角洲前缘亚相,水下分流河道和河口坝是该区储层骨架砂体,同时也是油气储存的主要场所。研究区发育残余粒间孔、溶蚀粒间孔、粒内溶孔、微孔隙及微裂隙,其中以溶蚀粒间孔、粒内溶孔及残余粒间孔为主。实验分析孔隙度主要分布在9.0-11.0%,平均值为9.2%；渗透率主要分布在0.2～0.6×10-3μm2,平均值为0.52×10-3μm2。属于特低孔、特低渗储层。通过对该区“四性”关系研究总结出,研究区岩性下限为细砂岩,含油产状定在油迹级及以上。有效储层孔隙度、渗透率下限分别为7.5%、0.24×10-3μm2。由电性图版确定有效厚度电性下限：△t≥224.0μs/m,ILD≥18.0Ω.m,So≥38.0%；224.0≥Δt≥216.0μs/m, ILD=-0.75*Δt+186Q.m,So≥38.0%。研究区测井解释孔隙度分布范围7.5～14.1%,平均值为9.8%；渗透率分布范围0.24～3.21×10-3μm2,平均值为0.57×10-3μm2。化子坪南区长6油层组为典型的岩性油藏,油气在空间上分布不均。纵向上,油气层位分布不均匀,主要集中在长6’、长62小层,长63占据比例较小；平面上,油气主要富集在工区的西北角—化子坪主体区的扩边区。研究区属于低丰度、低产能、中浅层,特低孔特低渗、小型储量规模、轻质常规油藏。油藏形成主要受河道有效砂体、泥岩和致密砂岩的侧向遮挡、鼻状隆起及浊沸石溶孔等因素控制。
[Abstract]:Huaziping South District is a new exploration area block in Ansai Xingzichuan Oil production Plant. In recent years, the block has entered the stage of development. Since the distribution of sand seepage body and microfacies distribution in Huaziping South District have not been studied in detail, the lithology and electrical properties of the reservoir in this area have been studied at the same time. The understanding of oil content and reservoir characteristics is not deep enough, which seriously restricts the oil development and further exploration in the study area. In view of the present situation, the geological fine characterization of the block is carried out. It is very necessary to study the relationship of "four properties" of reservoir and reservoir characteristics. This paper is guided by petroleum geology, reservoir sedimentology and many other geological disciplines, on the basis of drilling, logging and logging, analysis of test data and production test and production test data. The distribution of sedimentary facies, reservoir characteristics, relationship of reservoir "four properties" and reservoir characteristics are studied in Huaziping South region, and the controlling factors of reservoir in this area are summarized. Two broad and slow nose uplift are developed. The delta front subfacies is developed in Chang 6 oil formation. The underwater distributary channel and estuarine dam are the reservoir skeleton sand bodies in this area, and are also the main places for oil and gas storage. The residual intergranular pore and the solution intergranular pore are developed in the study area. The dissolution pore, micropore and microfissure are mainly composed of dissolved intergranular pore, intragranular dissolved pore and residual intergranular pore. The experimental analysis shows that the porosity is mainly distributed in the range of 9.0-11.0 with an average value of 9.2%, and the permeability is mainly distributed in 0.2n 0.6 脳 10 -3 渭 m 2 with an average value of 0.52 脳 10 -3 渭 m 2. Through the study of the relationship between "four properties" in this area, it is concluded that the lower limit of lithology in the study area is fine sandstone, the oil bearing pattern is defined in oil trace level and above, and the effective reservoir porosity, The lower limit of permeability is 7.55 脳 10 ~ (-3) 渭 m ~ (-2) respectively. The electric limit of effective thickness is determined by electrical chart: t 鈮，

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