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本文通过野外实测、薄片鉴定、物性资料以及成岩作用分析等,对川东北达州铁山地区下侏罗统自流井组大安寨段储层特征进行了详细研究,并对其有利储层进行评价。结果表明:研究区储集岩类型介壳灰岩和(含)泥质介壳灰岩;储层储集空间类型主要为生物碎屑颗粒内的粒内溶孔和裂缝,孔隙度的平均值为4.48%,渗透率的平均值为0.036×10-3μm2;储层主要形成于介壳滩环境,多期次成岩变化,其中压实作用、压溶作用、胶结作用、裂缝充填作用是孔隙损失的主要因素,而溶蚀作用和破裂作用是研究区内能形成致密储层的关键因素;研究区大一亚段储层为高能介壳滩相结晶灰岩型储层,大二亚段和大三亚段储层为低能滩相含有机质泥质介壳灰岩型储层,前者勘探潜力大于后两者。
In this paper, the reservoir characteristics of Daanzhai section of Lower Jurassic Ziliujing Formation in Tieshan area, Dazhou, northeastern China were studied in detail by field observations, sheet identification, petrophysical data and diagenesis analysis. The favorable reservoirs were also evaluated. The results show that the reservoirs are limestones and (or) muddy limestone with reservoir type in the study area. The main types of reservoir space are intragranular dissolved pores and fractures in biological debris particles, and the average porosity is 4.48 % And the average permeability is 0.036 × 10-3μm2. The reservoirs are mainly formed in the crust beach environment with multiple stages of diagenesis. Compaction, pressure solution, cementation and fracture filling are the main factors of pore loss , And dissolution and fracture are the key factors that can form tight reservoirs in the study area. The reservoir of the 1st member of the study area is a high-energy crustal-facies crystalline limestone reservoir, and the reservoirs of the 2nd and 3rd Sectors For the low-energy beach facies containing organic muddy limestone-type reservoirs, the former exploration potential is greater than the latter two.