滨里海盆地北特鲁瓦油田上石炭统碳酸盐岩沉积相研究与有利储层预测  

The Research of Sedimentary Facies and Prediction of Favorable Reservoir of the Upper Carboniferous Carbonates in North Tluwa Oilfield,Pre-Caspian Basin

作　　者：张宝露[1] 张敏 李维锋[2] 袁晓光[2] 李欣雨 

机构地区：[1]长江大学地球环境与水资源学院,武汉430100 [2]长江大学地球科学学院,武汉430100 [3]中石油渤海钻探工程公司第四钻井分公司,任丘062552

出　　处：《科学技术与工程》2015年第12期34-43,共10页Science Technology and Engineering

摘　　要：北特鲁瓦油田是近年来在滨里海盆地东缘发现的大型油气田,石炭系碳酸盐岩是最重要的含油层系。通过岩心、测录井资料分析,以及大量薄片及扫描电镜微观观察,认为北特鲁瓦油田上石炭统碳酸盐岩地层属于碳酸盐岩台地相沉积,可进一步分为蒸发台地、局限台地、开阔台地3个亚相;以及膏岩坪、白云坪、潟湖等7个微相,各沉积微相的特征显著。剖面及平面上沉积演化分析表明,上石炭统沉积时期处于一个海平面逐渐下降的过程,在Б2时期,研究区全部为开阔台地亚相;到A2时期,研究区大部分为蒸发台地、局限台地亚相。通过总结平面上各微相分布规律,建立了适宜北特鲁瓦油田的碳酸盐岩沉积模式。通过微观孔隙类型及特征分析,结合沉积微相研究,发现局限台地内的白云坪微相及开阔台地内的台地滩微相储集物性最好,其内发育的粉晶生屑云岩、晶粒云岩及亮晶颗粒灰岩、生物格架灰岩是油田最有利的储集层。上述研究成果将为油田后续的评价开发提供新的地质依据。The North Tluwa Oilfield is a big oilfield which was discovered in the eastern Pre-Caspian Basin in recent years, the carboniferous carbonate is the most important oil-bearing series. Through the analysis of core, logging data, and the micro-observation of many sections and SEM, the upper-carboniferous carbonate was considered belongs to carbonate platform facies, and could be divided into 3 subfacies and 7 microfacies, which including cream rock terrace, dolomite terrace,lagoon microfacies and so on. The analysis of sedimentary evolution of profiles and planes indicates that, it was in a process of falling of sea level, in the period of B2, the area was open platform subfacies, but in the period of A2, most of it was evaporate platform and restricted platform subfacies. Through concluding the distributary regular of every microfacies in the plane, the sedimentary model of area was build. Through the analysis of the type and patterns of micro-core, combined the research of microfacies, the dolomite terrace was found in the restricted platform and platform beach microfacies in the open platform have the best reservoir physical property, the sih-crystalline bioclastic dolostone, crystal grain dolostone, and sparry grain limestone and biological framework limestone are the best reservoir. The upper research will offer a new geological basis to the subsequent evaluation and development.

关 键 词：北特鲁瓦油田 石炭系 碳酸盐岩 沉积模式 有利储层 

分 类 号：TE122.1[石油与天然气工程—油气勘探]