四川盆地乐山—龙女寺古隆起洗象池群碳酸盐岩储层特征

来源期刊:中南大学学报(自然科学版)2014年第12期

论文作者:周磊 康志宏 柳洲 孔杰霜 陈夷

文章页码:4393 - 4402

关键词:乐山—龙女寺古隆起;洗象池群;储层类型;古岩溶

Key words:Leshan-Longnvsi palaeo-uplift; Xixiangchi Group; reservoir types; paleokarst

摘    要:中上寒武统洗象池群作为乐山—龙女寺古隆起油气勘探接替层系,发育一套局限台地相白云岩。其储集体致密,基质孔、渗特性差,但仍有高孔、渗储集空间存在于砂屑白云岩和鲕状白云岩中。依据岩心、铸体薄片、扫描电镜及FMI测井等资料研究分析,将其储集空间划分孔隙型、孔洞型、孔洞-裂缝型和裂缝-孔隙型4种类型。研究结果表明,在沉积期局限台地高能部位的砂屑滩和鲕粒滩相带水动力较强,经海水淘洗作用形成粗结构、多孔碳酸盐岩,为后期岩溶改造作用奠定物质基础;在抬升暴露风化期易发生表生岩溶作用形成溶蚀孔洞甚至垮塌洞穴,同时古岩溶发育程度受构造裂缝制约,形成复杂碳酸盐岩孔-缝-洞储集系统。因而,礁滩相带、岩溶斜坡带与构造裂缝发育带是有利储集层的主要发育带。

Abstract: Lower-upper Cambrian Xixiangchi Group is an important successive series of strata of exploration in the oil and gas, developing a restricted platform facies dolomite. The reservoir is compact and has low matrix porosity and permeability, but high porosity and permeability storing space of carbonate rock commonly occurs in arenite dolomites and oolitic dolomites. According to the rock core and thin section observation and FMI log data analysis, the reservoir is divided into four types: pore type, cave type, and cave-crack type, crack-pore type. The results show that during the deposition period, the psammitic beach and oolitic bank exist in the restricted platform of higher terrain position, forming macro crystalline and porous carbonatite and having provided the basis of materials for the forming of late-stage reservoirs. In the weathering period,the reservoirs are uplifted to be exposed and the psammitic beach and oolitic bank form holes, even collapse cave by epigenic karstification. In addition, the palaeokarst layer is constrains by tectonic fractures, finally forming pore-crack-hole system. Consequently, the main development zones of excellent reservoirs are reef-bank facies and the area with karst ramps and structural fractures.

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