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川中地区上三叠统须家河组层序格架内储层特征
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摘要
在前人勘探研究的基础上,本论文以川中地区须家河组为研究对象,根据沉积学、层序地层学以及储层沉积学理论为指导,结合野外剖面、岩心观察、铸体薄片分析、扫描电镜分析、孔渗物性分析等资料,对川中古隆起北东侧的广安-合川-安岳地区须二、须四、须六段开展层序地层学特征和地层格架中的储层分布规律研究,取得的主要成果有如下几点:
     1.根据前人研究资料,结合野外剖面、测井资料分析,开展了川中古隆起层序地层学研究,提出了适合研究区的地层划分方案,分析了层序发育特征、层序界面类型及成因特征,并将须二段的“腰带子”及须五段的煤层分别作为界面,将广安-合川-安岳地区的须家河组二段-六段划分了6个三级层序(SQ1~SQ6),并对每个层序进行了对比分析,认为在须二段、须四段、须六段中SQ1、SQ2、SQ3、SQ6层序发育比较完全,砂体展布较好,砂体有大面积稳定分布的特点。
     2.根据沉积特征分析,将川中地区沉积体系划分为辫状河三角洲-浅湖体系,由须二-须六的岩相古地理编图结果,表明辫状河三角洲体系的分流河道主要来自于川东北的米仓山-大巴山、渝东江南古陆及川南的峨眉瓦山地区,沉积相展布主要受川中古隆起北东侧古地形控制的特点。
     3.根据层序格架内的孔渗物性资料、铸体薄片分析,认为广安-合川-安岳地区中-低丰度的岩性油气藏有效孔隙度下限为6%,各个层序中储层在纵向上的分布,主要出现在须二段、须四段、须六段的SQ1、SQ2、SQ3、SQ6层序中,储层的物性较好,并且显示在靠近层序界面的中下部砂体物性更好;在平面上,将须家河组各层序的储层孔隙度等厚线投到沉积相分布图上,显示须二、四段的储层主要分布在合川、潼南地区,物性以分流河道砂体为较好,而须六段的储层主要分布在广安地区,也以分流河道微相的砂体储层物性为较好。
     4.通过分析层序格架内的沉积作用、成岩作用,划分出5种对孔隙发育有重要的影响成岩相,确定在影响储层物性的众多因素中,沉积作用是储层发育的基础,在宏观上控制了储层的区域分布规律,成岩作用是储层发育的关键,它决定了储层物性的好坏,构造作用是形成天然气藏和储层高产的重要条件。
Based on the previous research of exploration, this paper studies the Xujiahe formation in central Sichuan. Accordding to sedimentology, sequence stratigraphy, sedimentology of reservoir theory, and combined with the field profile, analyses of cores, cast thin-sections, SEM, and analyses of porosity and permeability properties, it researches the characteristics of sequence stratigraphy and the reserve layer distribution of stratigraphic framework of Xujiahe Formation T3X2、T3X4、T3X6 in Guangan-Hechuan-Anyue areas of northeast of the medieval SiChuan uplift, the main achieved results include the following:
     1. According to the previous studies, combined with the field profile, and analysis of the log data, it carried out the sequence stratigraphy research in the medieval SiChuan, proposed the division program of the stratigraphic in the study area, analysed the characteristics of the types and the causes of the sequence boundary, took "sub-belt" in T3X2 and the coal seam in T3X5 as a flood plain face. It is divided into six third-order sequences from T3X2 to T3X6 in Xujiahe formation of Guangan - Hechuan - Anyue region (SQ1 ~ SQ6). By comparing each sequence, it has a result that sequence comparison completely in T3X2、T3X4、T3X6 (SQ1, SQ2, SQ3, SQ6 ), the sandbody cloth well and has the characteristics of stable distribution.
     2. According to the analysis of sedimentary features, it is divided into braided river delta-shallow lake depositional system in medieval Sichuan region. By the results of lithofacies palaeogeography map from T3X2 to T3X6, it shows the main distributary channel of braided river delta system comes from the northeastern Sichuan MiCangshan-DaBashan, Chongqing and oldland in Sichuan Jiangnan and Washan of Emei Mountain region. The distribution of sedimentary facies is mainly affected by the north eastern side of the ancient topography characteristics in medieval Sichuan uplift.
     3. According to the analyses of porosity, permeability and cast sheet of sequence stratigraphic framework, it concludes that the minimum effective porosity is 6% in middle-lower abundance of oil and gas reservoir lithology of Guangan- Hechuan- Anyue regions. The reservoir in the vertical distribution of the various sequences is mainly in the sequence of T3X2、T3X4、T3X6 (SQ1, SQ2, SQ3, SQ6 ), and the physical properties of reservoir is good, and shows the physical properties is better in the bottom of sequence boundary of the sandbody; In the plane, the isopach map of each sequence of reservoir porosity is Superimposed into sedimentary facies, and it shows that the reservoirs of T3X2, T3X4 fomation are mainly distributed in Hechuan, Tongnan areas, and the distribution of properties is better in sandbody of channel. The reservoir of T3X6 fomation is mainly distributed in Guangan areas, and the distribution of properties is better in sandbody of micro channel.
     4. By analyzing the sedimentation, diagenesis of the sequence stratigraphic framework, it is divided into five kinds of diagenetic phases, which play important implications in porosity development. From the many impact factors of reservoir properties, sedimentation is the basis of reservoir development, which control the macro distribution of reservoir; The diagenesis is the key to reservoir development, which determines the quality of reservoir properties. And the structure is an important condition for the formation of natural gas and the high yield of reservoir.
引文
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