西湖凹陷平湖构造带平湖组砂岩储层特征及其主控因素

doi:10.11743/ogg20130207

摘要/Abstract

摘要：

以岩心和铸体薄片观察为基础,结合扫描电镜、储层物性、压汞及试采等综合资料分析,对西湖凹陷平湖构造带平湖组砂岩储层发育特征进行了研究。结果表明,该区平湖组储层岩石类型以长石质石英砂岩为主,颗粒分选和磨圆度较好,成分成熟度中等,结构成熟度高;储层物性表现为低孔、低渗和中孔、中渗的特征,孔、渗相关性好;孔隙类型主要发育有粒间溶孔和剩余原生粒间孔,喉道类型以缩颈型喉道、片状喉道、弯片状喉道为主,孔、喉组合以中孔、粗喉为主。在此基础上,从沉积相、成岩作用和异常超压等方面对该区储层发育主控因素进行了分析。综合研究表明,沉积相是该区储层发育的主控因素之一,其中三角洲平原分支河道砂体物性最好,其次为三角洲前缘水下分流河道砂体;压实作用和胶结作用导致该区储层物性变差,溶蚀作用则有助于形成次生孔隙空间,并大大改善储层物性;异常超压对研究区储层有建设性影响,可以在一定程度上使原生孔隙得以保存,并促进早期碳酸盐胶结物的溶解,形成粒间溶孔,改善储层物性。

关键词: 异常超压, 沉积相, 成岩作用, 储层特征, 平湖组, 平湖构造带, 西湖凹陷

Abstract:

Based on comprehensive analysis of various data such as core observation,casting thin sections,scanning electron microscope,physical property analysis,mercury penetration and production test,we studied the characteristics and the main controlling factors of the sandstone reservoirs in the Pinghu Formation of Pinghu tectonic belt in Xihu depression.The results show that the reservoir rocks are dominated by feldspathic quartz sandstone with good sorting and roundness,moderate compositional maturity and high texture maturity.The reservoir is characterized by low porosity and low permeability or moderate porosity and moderate permeability,as well as a good correlation between porosity and permeability.The pores are dominated by intergmular dissolution pores and relic primary intergmular pores,the pore throats are mainly of necking throat,laminated throat and curved lamellar throat,and the pore-throat assemblages are dominated by moderate pore-coarse throat.The main controlling factors of reservoir development in the research region were studied in respects of sedimentary facies,diagenesis and abnormal high pressure.Sedimentary facies is one of the main factors controlling the reservoir quality.The sandstone reservoirs of delta plain distributary channel facies are the best in physical properties,followed by delta front underwater distributary channel facies.Compaction and cementation are destructive to reservoir physical property,while dissolution is constructive to reservoir physical property as it can generate secondary porosity.The existence of abnormal high pressure is also constructive to reservoir physical property,for it is helpful to the preservation of the original intergranular pores and to the improvement of dissolution of the early carbonate cement,resulting in intergranular dissolution pores and improving the reservoir physical properties.

Key words: abnormal high pressure, sedimentary facies, diagenesis, reservoir characteristics, Pinghu Formation, Pinghu tectonic belt, Xihu Depreesion

中图分类号:

TE121.2

胡明毅,沈娇,胡蝶. 西湖凹陷平湖构造带平湖组砂岩储层特征及其主控因素[J]. 石油与天然气地质, 2013, 34(2): 185-191. doi: 10.11743/ogg20130207 Hu Mingyi,Shen Jiao,Hu Die. Reservoir characteristics and its main controlling factors of the Pinghu Formation in Pinghu structural belt,Xihu Depression[J]. Oil & Gas Geology, 2013, 34(2): 185-191. doi: 10.11743/ogg20130207

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