摘要
塔里木盆地中寒武统蒸发台地白云岩具有良好的勘探前景。在野外露头、普通薄片、扫描电镜、阴极发光及地球化学资料分析的基础上,对塔里木盆地肖尔布拉克剖面中寒武统白云岩储层特征进行了研究。结果表明:研究区中寒武统岩石类型多样,储集空间以溶蚀孔、垮塌孔洞(垮塌遮蔽孔)为主;结合孔洞分布特征、伴生矿物和地球化学特征,探讨了储层成因机理,认为研究区储层成因包括同生期大气水溶蚀、浅埋藏期垮塌堆积和深埋藏期热液溶蚀3种机理,其中前两者受海平面变化控制,分布范围广,埋藏期热液溶蚀作用纵向上与深大断层伴生,其溶蚀范围平面上呈层状分布,存在改造早期溶蚀孔洞的现象。
There was a high hydrocarbon potential in the evaporite platform dolomite of Middle Cambrian in Tarim Basin.Based on the outcrop observation and the comprehensive analyzes of common thin section, scanning electron microscope（SEM）,cathodeluminescence（CL）technique and the geochemical data,we carried out the research on the characteristics of a dolomite reservoir which had deposited in the section of X in Tarim Basin during the Middle Cambrian.The results show that the Middle Cambrian rocks in the study area are of various types,and the reservoir′s space mainly includes the dissolved pores and the collapsed caverns（the collapsed shadowing hole）.We also studied the reservoir′s forming mechanism through the assay of accompanying minerals and the analyses of the pore characteristics and geochemical characteristics.It indicates that the mechanisms in the study area include the atmospheric water denudation in syngenetic stage,the collapsing rock′s stacking interaction in middle burial stage and the hydrothermal dissolution in deep burial stage.The former two mechanisms were controlled by the fluctuation of sea level,so they distributed widely.However,the distribution of the third mechanism is quite limited,because it was vertically accompanied by the faults and horizontally distributed along the formation,and it may alter the early generated dissolved pores.
出处
《天然气地球科学》
EI
CAS
CSCD
北大核心
2014年第4期498-507,共10页
Natural Gas Geoscience
基金
国家科技重大专项"塔里木盆地白云岩优质储层发育模式及分布规律"(编号:2011ZX05004-004-007)资助
关键词
蒸发台地
储层特征
成因机理
中寒武统
塔里木盆地
Evaporite platform； Reservoir Characteristics； Forming mechanisms； Middle Cambrian； Tarim Basin
