摘要
根据高分辨率层序地层学原理,通过岩芯、测井、录井、地震资料的综合分析,将研究区沙三中、沙三上、沙二下目的层段划分出4个长期旋回(层序):LSCⅠ、LSCⅡ、LSCⅢ、LSCⅣ。层序类型有两种,既陆缘碎屑岩层序和盐岩层序。陆缘碎屑层序以发育前三角洲泥岩以及三角洲前缘粉砂质沉积以及洪水-漫湖沉积为主;盐岩层序主要发育盐岩以及盐岩夹深湖泥岩为主。识别出三种类型的沉积体系:深湖半深湖-盐湖-浊积扇、三角洲前缘-前三角洲、洪水-漫湖,并且在层序格架内分析了各旋回的沉积体系特征以及砂体发育情况。通过综合分析生、储、盖条件认为,在垂向上,LSCⅣ旋回中部为最有利的储集层段,其次为LSCⅠ旋回的顶部及底部。在平面上,下一步勘探重点应为Ps14块、W242块、W188块-W184块、W45块以及W266块的断层-岩性油气藏。
Based on cores, logs and seismic data, four long cycles （sequences） can be recognized in the studied strata with the principle of base-level, which are called LSCⅠ , LSCⅡ , LSCⅢ, LSCⅣ in increasing order. There are two types of sequences in these cycles; clastic rock sequence and salt rock sequence. Clastic rock sequence is characterized by mudstones of prodelta, siltstone of delta front and flood-overflow lake deposits. Salt rock sequence is characterized by salt rack and salt rock interbedded with mudstones of deep lake. Three depositional systems are recognized, namely deep lake hemi deep lake- salt lake-turbidite, delta front-prodelta, flood-overflow lake. Evolution and distribution of theses depositional systems and facies ase interpreted in these cycles. According to the characteristics of reservoirs, source rocks and cap rocks, the favorable section sequence is the middle of the LSCⅣ and then the upside and underpart of the LSCⅠ ,and the favorable blocks are： Ps14, W242, W188-W184, W45, W266.
出处
《内蒙古石油化工》
CAS
2005年第8期136-138,共3页
Inner Mongolia Petrochemical Industry
