渤海A油田扇三角洲相低渗储层特征及物性控制因素

发布时间：2018-04-15 00:00

本文选题：成岩作用 + 储层物性　；参考：《石油与天然气地质》2017年01期

【摘要】：为弄清渤海A油田沙三下亚段的储层特征及物性控制因素,利用薄片、扫描电镜、压汞及常规物性等分析化验资料,分析了储层的岩石成分、孔隙类型及结构、物性特征,并从沉积、成岩和构造作用等方面探讨了储层物性的控制因素。研究表明,沙三下亚段扇三角洲储层主要由成分成熟度低的岩屑长石砂岩组成,孔隙类型主要为原生粒间孔、溶蚀孔及残余原生孔组成的混合孔,孔喉结构表现为微细-细特征,属于低、特低孔-特低渗储层。储层物性主要受控于沉积作用、溶蚀作用及构造活动等。扇三角洲前缘分流河道及河口砂坝沉积环境控制了砂岩碎屑颗粒的粒度和分选,物性较好。压实和胶结作用是储层低渗的主要原因,有机酸对长石、岩屑的溶蚀造成了储层次生孔隙的发育,异常高压的形成减弱了压实作用的强度,促进了原生粒间孔的保存。构造活动形成的断层附近裂缝发育,有助于改善储层物性。综合分析认为,水动力较强的原始沉积环境、后期溶蚀改造及裂缝发育是相对高孔渗储层发育的主控因素。
[Abstract]:In order to make clear the reservoir characteristics and physical property control factors of the lower member of Sha 3 in Bohai A Oilfield, the rock composition, pore type, structure and physical properties of the reservoir are analyzed by means of thin slice, scanning electron microscope, mercury injection and conventional physical properties.The controlling factors of reservoir physical properties are discussed in terms of sedimentation, diagenesis and tectonism.The results show that the fan delta reservoir of the lower part of the Sha 3 is mainly composed of lithic feldspar sandstone with low compositional maturity, and the pore types are mainly composed of primary intergranular pore, solution pore and residual primary pore.The pore-throat structure is characterized by micro-fine, which belongs to low, very low porosity-very low permeability reservoirs.Reservoir physical properties are mainly controlled by sedimentation, dissolution and tectonic activity.The sedimentary environment of fan delta front distributary channel and estuarine bar controls the grain size and sorting of sandstone clastic grain, and its physical properties are better.Compaction and cementation are the main reasons for low permeability of reservoir. The dissolution of organic acid to feldspar and cuttings leads to the development of secondary pores in reservoir. The formation of abnormal high pressure weakens the strength of compaction and promotes the preservation of primary intergranular pores.Fracture development near faults formed by tectonic activity is helpful to improve reservoir physical properties.The comprehensive analysis shows that the relatively high porosity and permeability reservoirs are mainly controlled by the relatively strong hydrodynamic original sedimentary environment, the later dissolution transformation and the development of fractures.
【作者单位】：中海石油(中国)有限公司天津分公司渤海石油研究院;
【基金】：国家科技重大专项(2011ZX05023-002) 中国海洋石油总公司科技攻关项目(CNOOC-KJ125ZDXM07LTDTJ02)
【分类号】：P618.13

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