东营凹陷F154地区沙三段浊积岩储集空间特征研究

发布时间：2019-03-16 16:46

【摘要】：致密油指储集在覆压基质渗透率小于0.2×10-3μm2的致密砂岩、致密碳酸盐岩中的石油,东营凹陷F154地区沙三段浊积岩储层属于致密砂岩储层。F154地区沙三段浊积岩储层具有埋藏深、砂泥岩薄互层出现、分布规律复杂等特点。本论文通过岩心取样观察、铸体薄片分析、扫描电镜观察以及数字图像定量分析等方法对东营凹陷F154地区沙三段浊积岩储层特征进行了描述,总结了浊积岩储层储集空间的基本特征,分析了浊积岩储层发育的控制因素,论文研究取得了以下认识。(1)F154区块沙三段浊积岩岩性以岩屑长石砂岩和长石岩屑砂岩为主。其成分成熟度低,岩屑和长石含量高,石英含量低;杂基含量较高,胶结物以方解石和高岭石为主;粒度以细砂为主,部分为粉砂、中砂,分选中等,磨圆度以次棱角状为主,孔隙式胶结,结构成熟度较低。物性特征表明F154区块沙三段浊积岩属中低孔超低渗储层。(2)利用铸体薄片、扫描电镜等方法研究了储层储集空间类型,研究区储集空间类型包括粒间溶孔、岩屑粒内溶孔、长石粒内溶孔、原生孔、铸模孔、杂基孔和晶间孔,主要类型为粒间溶孔、岩屑粒内溶孔和长石粒内溶孔。储集空间定量分析表明储集空间的孔径分布为5~10um,不同储集空间主要孔径大小不同,粒间孔和粒内溶孔的孔径较大,杂基孔和晶间孔的孔径较小,原生孔的孔径分布差异较大。(3)浊积岩储层的物性控制因素主要包括碎屑矿物组分、填隙物、岩石结构、层厚以及成岩作用等,其中填隙物和层厚是控制研究区物性的主要因素,渗透率低的原因之一是由于相邻泥质层的钙质充填堵塞喉道造成的。
[Abstract]:Tight oil refers to the oil stored in tight sandstone with overpressure matrix permeability less than 0.2 脳 10-3 渭 m 2 and tight carbonate rock. The turbidite reservoir in the third member of Shahejie formation in Dongying Sag belongs to tight sandstone reservoir. The turbidite reservoir in the third member of Shahejie formation in F154 area has the characteristics of deep burial, thin interbedded sand-mudstone layer and complex distribution law. In this paper, the characteristics of turbidite reservoir in the third member of Shahejie formation in Dongying Sag are described by means of core sampling observation, casting slice analysis, scanning electron microscope observation and digital image quantitative analysis. The basic characteristics of reservoir space of turbidite reservoirs are summarized, and the controlling factors for the development of turbidite reservoirs are analyzed. The following knowledge is obtained in this paper. (1) the lithology of turbidite rocks in the third member of Shahejie formation of block F154 is dominated by lithic feldspathic sandstone and feldspar lithic sandstone. Its composition maturity is low, the content of cuttings and feldspar is high, the content of quartz is low, the content of hetero-base is higher, and the cements are mainly calcite and kaolinite. The grain size is mainly fine sand, the part is silty sand, the middle sand, the separation is medium, the grinding roundness is mainly in the form of sub-edge and corner, the pore-type cementation, and the structure maturity is low. The physical properties show that the turbidite in the third member of Shahejie formation in F154 block belongs to medium-low porosity and ultra-low permeability reservoir. (2) the reservoir space types are studied by means of casting slice, scanning electron microscope, etc. The reservoir space types in the study area include intergranular solution pore and cuttings intragranular solution pore, and the reservoir space type includes intergranular solution pore, cuttings intragranular solution pore, etc. The main types of feldspar are intergranular dissolved pore, cuttings intragranular lysing pore and feldspar intragranular dissolution pore, and the main types are intergranular dissolution pore, primary pore, casting mould pore, hetero-base pore and intergranular pore. The quantitative analysis of the reservoir space shows that the pore size distribution of the storage space is 5 脳 10 m, the main pore size of different storage space is different, the pore size of intergranular pore and intragranular dissolved pore is larger, and the pore size of hetero-basic pore and intergranular pore is smaller, and the pore size of intergranular pore and intergranular pore is smaller than that of intergranular pore. The pore size distribution of primary pores varies greatly. (3) the physical properties of turbidite reservoirs are mainly composed of clastic mineral composition, pore filling, rock structure, layer thickness and diagenesis, etc. The porosity and layer thickness are the main factors controlling the physical properties of the study area. One of the reasons for the low permeability is that the calcium filling in adjacent muddy layer blocks the throat.
【学位授予单位】：成都理工大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：P618.13

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