摘要
为确定川西新马—什邡地区蓬莱镇组三段气藏沉积、储层特征及其控制因素,利用岩心观察、薄片、物性、压汞曲线等分析,结合地震属性预测等结果,采用地质—地震、宏观与微观相结合的方法开展研究。结果表明:蓬三段由5个砂组构成,各砂组厚度变化较小,反映沉积期构造稳定、地势平缓,蓬三段JP_2~3砂组属于浅水湖盆河控三角洲前缘沉积。细粒岩屑砂岩为JP_2~3砂组主要储集岩,粒间孔为主要的储集空间类型,粒间溶孔、粒内溶孔、铸模孔等也较为发育,以中孔、小孔为主;喉道总体呈差—中等分选、中细歪度,为中—细喉道的特征;孔喉组合总体为中—小孔—中—细喉,渗流能力中等—较差,为典型特低孔—低孔—低渗—特低渗的孔隙型储层。沉积微相是控制JP_2~3砂组储层发育的关键,并控制储层厚度、岩性粒度和充填物成分,导致储层物性和孔隙结构等差异。
In order to determine the sedimentary and reservoir characteristics and control factors of upper Jurassic Penglaizhen formation member 3 in Xinma-Shifang area,west Sichuan,based on detailed observation from well cores,ordinary and mold thin section,and the results analysis of porosity,permeability,mercury from core samples,combined with seismic attribute interpretation,the methods of well seismic integration,macroscopic and microscopic studies integration are utilized.Research results show that Peng member 3 can be further divided into five sand groups.Internal sandstone groups strata thickness is relatively stable,which shows that the strata was deposited in sedimentary environment of stable structure,flat landscape.Combined with the characteristics of facies marks,facies sequence character analysis,the sedimentary mode is fitted to shallow-water river-controlling gentle blanket delta front deposition,and delta front underwater distributary channel is the most favorable sedimentary micro-facies.In JP_2~3 sandstone groups,the reservoir rock is mostly fine-grained lithic-sandstone.The reservoir space types are dominated by intergranular pore,also including some intergranular dissolved pore,intragranular dissolved pore,moldic pore,and the pores are dominated by middle-little size.The middle-fine throat distribution is the characteristics of poor-medium sorting and middle-fine skewness.In general,the composition of pore and throat is relatively poor with the characteristics of middle-little dissolved pore and middle-fine throat,which also leads to the medium-poor permeability ability.The reservoirs are typical of extra-low to low porosity,low to extra-low permeability reservoirs.Sedimentary micro-facies is the key factor to control the development of reservoirs in the JP_2~3 sand group,which further controls the thickness of reservoir,the grain size of lithology and the composition of fillings,and also leads to the difference of reservoir physical properties and pore-throat structure.
引文
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