准噶尔盆地深层致密油储层特征及致密化成因——以莫索湾—莫北地区侏罗系八道湾组为例

发布时间：2018-04-27 08:48

本文选题：准噶尔盆地 + 莫索湾—莫北地区　；参考：《吉林大学学报(地球科学版)》2017年01期

【摘要】：综合利用岩心、岩石薄片、扫描电镜及测井等资料,对准噶尔盆地莫索湾—莫北地区侏罗系八道湾组致密油储层特征及其致密化成因进行研究。结果表明:八道湾组储层为低—特低孔、低—特低渗储层,属典型的深层致密砂岩储层;储层砂体主要为三角洲前缘水下分流河道细砂岩、中—细砂岩,成分成熟度低,具有岩屑和塑性岩屑含量高及胶结物含量低的"两高一低"特征;垂向上以4 100和4 500m为界,可划分为减小原生孔、稳定混合孔及增加次生孔3个孔隙演化带;孔隙主要为中—小孔,孔喉类型以分选较差的中-细孔—细喉型为主,连通性和渗流能力相对较差,结构相对较差。储层致密化主要受控于沉积环境相对稳定性、岩石主要成分、储层埋藏深度及胶结物赋存状态4个因素,构成了致密化的背景、内因和外因;相对稳定的沉积环境、低成分成熟度、高岩屑和塑性岩屑含量、储层埋深大、压溶作用大量减孔,以及不同类型胶结物以4种状态充填孔喉,形成了八道湾组致密储层。
[Abstract]:Based on the data of core, thin slice, scanning electron microscope and logging, the characteristics and densification factors of tight oil reservoir of Badaowan formation of Jurassic system in Mosuowan-Mobei area of Junggar Basin are studied. The results show that the Badaowan formation reservoir is a typical deep tight sandstone reservoir with low and ultra-low porosity and low permeability, and the reservoir sand body is mainly composed of subaqueous distributary channel fine sandstone in delta front, medium fine sandstone and low compositional maturity. It has the characteristics of high content of cuttings and plastic cuttings and low content of cemented matter, with vertical boundaries of 4 100 and 4 500 m, which can be divided into three pore evolution zones: reducing primary pore, stabilizing mixed pore and increasing secondary pore. The porosity is mainly meso-pore, the type of pore throat is mainly meso-fine pore and fine throat, the connectivity and percolation ability are relatively poor, and the structure is relatively poor. The densification of reservoir is mainly controlled by the relative stability of sedimentary environment, the main composition of rock, the depth of reservoir burial and the state of occurrence of cementation, which constitute the background of densification, internal and external factors, relatively stable sedimentary environment, The tight reservoir of Badaowan formation is formed by low compositional maturity, high cuttings and plastic cuttings, large buried depth of reservoir, massive reduction of pore size by pressure-solution, and filling of pore throat with different types of cementation in four states.
【作者单位】：中国石油新疆油田分公司勘探开发研究院;
【基金】：国家重点基础研究发展计划项目(973计划)(2014CB239001) 国家科技重大专项(2016ZX05046-001)~~
【分类号】：P618.13

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