膏盐岩变形下的礁体识别与有效储层预测技术——以阿姆河盆地为例  

Identification of Reefs and Prediction of Effective Reservoirs in Deformed Gypsum Rocks--A case study in Amu-Darya Basin

作　　者：王玲[1] 张研[1] 马晓宇[1] 刘杏芳[1] 吴蕾 

机构地区：[1]中国石油勘探开发研究院 [2]中国石油阿姆河天然气公司

出　　处：《岩性油气藏》2010年第F07期127-130,共4页Lithologic Reservoirs

摘　　要：生物礁与膏盐岩是碳酸盐岩台地沉积中最重要的储盖组合类型。受古地貌、沉积相带以及后期构造运动的影响。生物礁类型和膏盐岩变形程度有所不同。膏盐岩的分布一方面受控于生物礁的发育程度；另一方面．由于后期构造运动的作用使得膏盐岩发生形变，影响盐下礁体的识别。该文以阿姆河盆地中油合作区块为例．对台缘以及斜坡带大量分布的生物礁与上覆膏盐岩变形程度进行了研究，分析了不同相带礁体与膏盐岩的地震响应特征；结合测井资料．探索出一套基于膏盐岩变形下的不同类型礁体识别方法；优选层序格架约束稀疏反演方法，并将其与岩石物理分析相结合，确定了储层门槛值，有效地消除了膏盐岩变形对生物礁储层的影响，并指出台缘斜坡带具有一定规模的点礁群是潜在的勘探领域。Organic reefs and gypsum rocks are the most important reservoir-cap association in carbonate platform deposits. Affected by paleo-geomorphology, sedimentary facies and later tectonic movement, the types of reefs and the degrees of gypsum transformation vary in different regions. On one hand, the distribution of gypsum rocks is controlled by the development of reefs; on the other hand, the identification of sub-salt reefs is influenced by the deformation of gypsum rocks due to tectonic movement in later stages. Via taking CNPC＇s equity block in Amu-Darya Basin as an example, this paper has studied the organic reefs massively distributed on the platform-edge and slope belts as well as the deformation of overlying gypsum rocks, and analyzed the seismic response characteristics of the reefs and the gypsum rocks in different facies; developed a method for different types of reefs identificated based on gypsum transformation by using the logging data; determined the reservoir threshold values by combining the optimum constrained sparse inversion of sequence frameworks and the petrophysical analysis, and effectively eliminated the impacts of gypsum rock deformation on reef reservoirs. Based on the above studies, the paper has pointed that the big patch reefs in the slope belt along the platform-edge are areas with prospecting potentials.

关 键 词：盐下构造 礁体特征 礁体识别 阿姆河盆地 

分 类 号：P631.4[天文地球—地质矿产勘探]