文南低品位区块致密储层特征及物性主控因素分析
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摘要
为弄清文南区块沙三中亚段三砂组(Es中33)储层特征及物性主控因素,在了解区域沉积背景,进行野外露头、岩心和录井岩屑观察的基础上,综合地质、测井、地震和测试等方法,对该区储层进行深入研究。结果表明,储集层岩性主要为长石岩屑质石英砂岩、岩屑质长石砂岩;孔喉网络宏观上主要靠粒间溶孔沟通,微观上主要靠微喉道和片状喉道;储层平均孔渗为10.84%、7.36 m D,表现出低孔-特低渗的特征。储层成因类型主要为三角洲沉积的水下分流河道砂体和滩坝砂体;储集空间主要受各类成岩作用改造,本区压实作用中等偏强,胶结作用范围大、类型多、程度强,导致原生孔隙大幅减少,孔渗变差;虽然溶蚀作用有利次生孔隙形成,但溶蚀程度较弱,对储层改造作用有限,最终导致储层致密化。
To make clear the characteristics and the main physical properties influence factors of the reservoir Esm33,at the basis of the understanding of the regional sedimentary background,outcrop,core and logging cuttings observation,comprehensive geological,logging,seismic and testing methods were further studyied.The results show that the reservoir lithology is mainly feldspar lithic quartz sandstone and lithic feldspar sandstone;pore network macro mainly intergranular dissolved pores,communication on microscopic mainly by micro-throat and sheet throat;the reservoir is low hole-extra low permeability reservoir of which average porosity and permeability is 10.84% and7.36 m D.Genetic types of reservoirmainly for underwater distributary channel sand bodies of delta and beach-bar sand body.Reservoir space is mainly affected by all kinds of diagenesis,because of strong compaction and large scale and strong degree cementation with various types.The primary pores are substantially reduced,porosity and flowing ablility decreases,the dissolution conducive to forming secondary pores,but weaker effect,and the improvement of reservoir is limited,eventually lead to densification reservoir.
引文
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