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黄骅坳陷上古生界砂岩成岩作用及储层特征研究
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摘要
黄骅坳陷上古生界是找油突破的有利地区。通过对大量储层物性数据资料的分析和整理,结合岩心与铸体薄片观察、扫描电镜、X-衍射和镜质体反射率等实验室分析技术,研究了黄骅坳陷上古生界砂岩储集层成岩作用特征及储层物性特征。结果表明:黄骅坳陷上古生界砂岩储集层主要以粉砂岩、细砂岩为主,过渡岩类为泥质粉砂岩和粉砂质泥岩,石英是陆源碎屑组分中的主要组成部分。从本溪组、太原组、山西组、下石盒子组、上石盒子组到石千峰组,砂岩成分成熟度及结构成熟度都有逐步降低的趋势。
     黄骅坳陷石炭-二叠纪地层从下而上主要发育的砂体类型是:障壁岛相砂体和潮坪相砂体主要发育于本溪组和太原组;三角洲砂体主要发育于山西组;曲流河砂体主要发育于下石盒子组和上石盒子组;湖泊相砂体主要发育于石千峰组。黄骅坳陷上古生界有利储层的砂体类型是三角洲相砂体和河流相砂体。
     黄骅坳陷上古生界砂岩储层储集空间类型为次生粒间孔、颗粒溶孔、晶间微孔、构造缝、压溶缝等,以次生粒间溶孔为特征。在晚成岩期岩屑、填隙物、长石颗粒以及高岭石发生溶蚀,产生了大量的次生孔隙,极大地改善了储层物性。
     成岩作用对研究区砂岩储层物性影响非常明显,压实作用是使砂岩原始孔隙度降低的主要成岩作用,碳酸盐胶结作用和石英次生加大是使砂岩储层孔隙度和渗透率降低的主要原因,而使砂岩物性得到改善的重要途径是溶解作用。
     黄骅坳陷上古生界储层总体上以低孔-低渗物性特征为主;储层的物性受多方面因素控制,沉积条件、压实作用、胶结作用和溶蚀作用是控制储层性质的主要因素,沉积相及成岩作用为研究区储层物性的主控因素,经溶解作用改造的河道砂体是有利于储层发育的储集砂体类型,也是进一步勘探的重点区域。
According to the study of both core and casting thin sections, analyzing thelithologic features and physical property, The sandstone reservoir show thecharacteristics of low porosity and low permeability reservoir In the study area. Theresult indicated that the main sandstone reservoir rocks of Upper Paleozoic on theHuanghua depression consist of fine sandstone , siltstone, muddy siltstone and sandymudstone of which fine sandstone are the best reservoir rocks. quartz is a majorcomponent of terrigenous rock fragment. Three reservoir are shown to BenxiFormation, Taiyuan Formation, Shanxi Formation, Lower Shihezi Formation, upperShihezi Formation and Shiqianfeng Formation from bottom to top. the maturity ofcomponent and texture of the sandstone reservoir are gradually decline.
     The character of Huanghua depression reservoir during Carboniferous-Permiantime shows that he favorable sandstone body composed of delta and river sand bodiesdelta bodie is commonly developed in Shanxi Formation, fluvial sand body iscommonly developed in Lower Shihezi Formation and Upper Shihezi Formation.
     The pore of sandstone reservoir of Huanghua depression reservoir duringCarboniferous-Permian time are mainly intergranular pore, intragranular pore andfracture, secondary solution pores is beneficial to improve the reservoir quality.
     The influence was caused by Diagenesis of the sandstone reservoir is veryobvious, compaction is to reduce the original porosity of sandstone, carbonatecementation and quartz overgrowth is to make the sandstone porosity andpermeability decline, Dissolution is an important method to improve storagephysical properties of sandstone
     The sandstone reservoir show the characteristics and pore structure featuresin-depth study of the study area under the sandstone reservoir for low permeabilityand low porosity.The main reservoir space of the reservoir is secondary dissolution pore ,The study indicates that the reservoir is controlled and influenced bysedimentary facies and diagenesis. Dissolution is the most important affecting factoron improved the nature of the secondary pores.
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