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塔里木盆地震旦系齐格布拉克组发育一套以碳酸盐岩为主的古老地层,它的形成时代老,埋藏深度大,后期改造强烈,储层成因控制因素复杂。露头剖面、岩心观察和150个薄片分析表明,齐格布拉克组发育微生物白云岩、颗粒白云岩、晶粒白云岩和混积岩4种类型,比例分别占30%、25%、30%和15%。齐格布拉克组储集空间包括孔隙(原生孔、次生孔和微生物岩相关孔)、溶洞和裂缝(构造溶蚀缝和缝合线)3种类型。68个露头和岩心样品测试揭示,微生物白云岩孔隙度集中分布在2.5%~3.5%之间;晶粒白云岩中晶间孔隙和溶蚀孔洞发育,孔隙度分布在2%~4%之间,最大的可达9%,且晶体越粗,孔隙度和渗透率越好;颗粒白云岩中溶蚀孔洞发育,孔隙度分布在2%~3.5%之间,部分可达7%。在此基础上,综合碳氧同位素和包裹体数据,认为大气淡水溶蚀作用是储层的主要贡献者,埋藏阶段构造—热液溶蚀作用对储层保存和再改造起重要作用。
In the Tarim Basin, the Sinian Qigeburak Formation developed a set of ancient carbonate-dominated formations. Its formation age was old, its depth of burial was large, the latter was strongly rebuilt, and the controlling factors of reservoir formation were complicated. Outcrop profile, core observation and analysis of 150 thin sections show that there are 4 types of microbial dolomite, granulite dolomite, granulite dolomite and diagenetic rock in the Zgbuluk Formation, accounting for 30%, 25%, 30% and 15%. There are three types of reservoirs in the Zugeraki Formation, including pores (primary pores, pores associated with secondary pores and microbial rocks), vugs and fractures (tectonic dissolution and sutures). The testing of 68 outcrops and core samples revealed that the porosity of microbial dolomites concentrated between 2.5% and 3.5%. The intergranular and dissolved pores in grain dolomites range from 2% to 4% The largest up to 9%, and the coarser the crystal, the better the porosity and permeability. The dissolved dolomite in the granulite dolomite develops with the porosity ranging from 2% to 3.5% and the fraction up to 7%. Based on these data, it is concluded that atmospheric freshwater erosion is the main contributor to the reservoir. The tectono-hydrothermal dissolution during the burial period plays an important role in reservoir preservation and re-engineering.