塔里木盆地北部震旦系齐格布拉克组白云岩储层特征及成因

发布时间：2018-04-08 22:39

本文选题：塔里木盆地　切入点：震旦系　出处：《天然气地球科学》2017年08期

【摘要】：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。
[Abstract]:The Zigburak formation of the Sinian in the Tarim Basin has developed a set of ancient strata dominated by carbonate rocks, which is formed in an old age, has a large burial depth, is strongly reformed in the later period, and the controlling factors of reservoir genesis are complex.Outcrop profile, core observation and 150 thin slice analysis show that microorganism dolomite, granular dolomite, grain dolomite and mixed rock are developed in Ziegburak formation, which account for 30% and 15%, respectively.The reservoir space of the Ziegburak formation consists of three types of pores (primary pores, secondary pores and microbe associated pores, caverns and fractures (structural dissolution joints and suture lines). 68 outcrops and core samples have been tested and revealed.The porosity of microorganism dolomite is between 2.5% and 3.5%, the intergranular porosity and the dissolution pore are developed, the porosity is between 2% and 4%, the maximum porosity is 9%, and the bigger the crystal is, the better the porosity and permeability are.In the granular dolomite, the dissolution voids are developed, the porosity is between 2% and 3.5%, and some of them can reach 7%.Based on the data of carbon and oxygen isotopes and inclusions, it is considered that the atmospheric fresh water dissolution is the main contributor of reservoir, and the tectonic-hydrothermal dissolution plays an important role in reservoir preservation and reconstruction in burial stage.
【作者单位】：中国石油勘探开发研究院;
【基金】：国家科技重大专项(编号:2016ZX05004) 中国石油股份公司科技重大专项(编号:2014E-32-01)联合资助
【分类号】：P618.13

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