四川盆地鱼洞梁白云岩储层特征及控制因素

CHARACTERISTICS AND CONTROLLING FACTORS OF DOLOMITE RESERVOIR INYUDONGLIANG AREA,SICHUAN BASIN

以四川北部鱼洞梁6条剖面样品的镜下岩石学特征为基础,以微区多参数实验分析数据为依据,对四川盆地鱼洞梁地区下三叠统飞仙关组白云岩储层进行了研究。认为飞仙关组最有利的储层为溶蚀颗粒型白云岩储层,储层控制因素包括:台缘及台内浅滩微相是储层形成的环境基础;颗粒类型是储层形成的物质基础;准同生期大气淡水淋滤溶蚀作用是储层形成的关键;早期少量的白云石化作用使储层得以保存;后期的各种酸性流体的溶蚀作用是改善储层的重要因素;无论早期还是埋藏期,过量的自生白云石则会大量充填储层空间,对储层有一定的破坏性作用。

Based on lithology Characteristics,micro-area and multi-parameter experimental analysis of samples,which were taken from 6 outcrops of Yudongliang area in the north of Sichuan Basin,this paper studied the dolomitereservoir of lower Triassic Feixianguan Formation. Grain-dissolved dolomite reservoir is the optimum. The controllingfactors are summed up as follows: shallow facies of platform margin or platform inner is the environmentbasement of reservoir;the type of grains is the material basement;penecontemporaneous dissolution by fresh wateris the key to the formation of reservoir;earlier proper dolomization preserves the reservoir;later acid fluid are importantfactors that the reservoir improves;both earlier and later excessive autogeny dolomite would fill the poreswhich is one kind of disadvantage for the reservoir.