延长油田靖边马宁油区三叠系延长组长2油层组沉积相及储层特征研究

发布时间：2018-01-01 07:31

本文关键词：延长油田靖边马宁油区三叠系延长组长2油层组沉积相及储层特征研究　出处：《西南石油大学》2017年硕士论文　论文类型：学位论文

【摘要】：本文以层序地层学、构造地质学、沉积岩石学、石油地质学、储层地质学等相关理论为指导,在综合了各种资料的基础上,对马宁油田长2油层组进行了地层划分与对比,分析了研究区内各小层的顶界面构造,依次研究单井相、剖面相、平面相,总结砂体展布规律,对储层的碎屑成分、填隙物成分、结构特征、孔隙类型、喉道类型、物性特征等进行研究,分析储层层间及层内非均质性,最后对研究区储层进行了综合分类及评价。获得了下列成果:本论文的主要研究目标是长21-1、长21-2小层,长21-1含油量更高。长21顶面构造为一个发育有数个低幅度鼻状构造的西倾单斜,往东发育一个小型洼陷,构造顶部较平缓开阔;长21-1顶界面构造具有继承性。研究区长21主要发育分支河道和河道间,其次是天然堤和决口扇,物源来自于东北向,分支河道呈东北—西南向延伸发育,研究区南部分支河道发育较多;长21-1期分支河道略向东南迁移且河道间更为发育,但砂地比更大。长21砂体的空间展布受物源方向和沉积相展布规律的影响,研究区南部分支河道发育区砂体厚度较厚;长21-1砂体厚度比长21-2薄。研究区岩石主要为长石砂岩,成分成熟度较低,填隙物含量较少,以细砂岩为主,磨圆多为次棱角状,分选较好,结构成熟度中等—较良好;原生粒间孔及长石粒内溶孔是主要储集空间,喉道以片状或弯片状、管束状喉道为主;长21储层属于孔渗相关性较强的低孔特低渗储层,孔渗展布方向与砂体延伸方向基本一致,高孔高渗地带大致重合,分布于河道砂体中心部位,高值区在研究区南部偏多;长21-1期砂体的孔隙度和渗透率比长21-2期的都要大。长21储层具有较强的层间及层内非均质性,长21-1的非均质性在三个小层中最强。研究区的勘探目标区以Ⅲ类储层为主,储层分布受沉积作用影响,河道砂体中心部位储层质量较好;与长21-2相比,长21-1的储层类型更好;研究区南部发育有更多的优质储层。
[Abstract]:Based on sequence stratigraphy, tectonic geology, sedimentary petrology, petroleum geology, reservoir geology and other related theories as a guide, based on a variety of materials, the Ma Ning oilfield Chang 2 formation of stratigraphic division and correlation, analysis of the top interface structure in the study area of each layer, in order to study single well facies the plane, profile, phase, summed up the distribution regularity of sand bodies and clastic constituents of the reservoir, interstitial material, structural characteristics, pore types, pore throat types, research material characteristics, analysis of reservoir interlayer and reservoir heterogeneity of the reservoir in the study area, finally carried out a comprehensive classification and evaluation. The following achievements: the main goal of this thesis is long 21-1, long 21-2 and long 21-1 layer, higher oil content. 21 top structure for a development of several low amplitude nose structure of the West monocline, east development a small sag, top structure A flat open top interface; long 21-1 structure is inherited. The Chang 21 mainly developed distributary channel and river, followed by natural levee and crevasse splay, the provenance was from the northeast to the Northeast Southwest Branch, the river was extended to the development, study area south branch river development; long period 21-1 branch the river slightly migrated to the southeast and the river more development, but in more than 21 long. Influence of spatial distribution of sand body by the provenance and sedimentary facies of the study area, the South Branch River development area of sand thickness; long 21-1 long 21-2 thin sand thickness than the study area. The rock is mainly feldspar sandstone, low compositional maturity, less the amount of interstitial material, with fine sandstone, rounded to subangular, well sorted, maturity medium is good; intergranular pore and feldspar dissolved pores in grains is the main reservoir space, throat in sheet or sheet bending Like, tube shaped throat; Chang 21 reservoir belongs to low porosity and permeability strong correlation between Kong Te and low permeability reservoir, porosity and permeability distribution direction and sand body extension direction is consistent, high porosity and high permeability zone are approximately coincident, distributed in the center of the channel sand body parts, high value area in the south of the study area is more porosity; long period of 21-1 and permeability of sand bodies than 21-2 long period must be large. Chang 21 reservoir has strong layer and inter layer heterogeneity, 21-1 heterogeneity in the three layer. The strongest exploration target area in the study area mainly in class III reservoir, reservoir distribution by sedimentation the center, channel sand reservoir quality is better; compared with the long 21-2, long 21-1 better reservoir types; there are more high-quality reservoirs in the south of the study area development.

【学位授予单位】：西南石油大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：P618.13

【相似文献】