论文部分内容阅读
塔里木盆地塔中地区中上奥陶统碳酸盐岩台地边缘以发育良好的多种粒屑滩和生物礁组成的镶边沉积体系为特征.通过精细的单井相分析,识别出砂屑滩、砾屑滩、生屑滩以及鲕粒滩等,并且区分出3种不同类型的生物礁:①隐藻灰泥丘;②主要由枝状苔藓虫、海绵或(和)珊瑚建造的障积礁;③由石质海绵、托盘类、层孔虫、珊瑚、管孔藻等建造的骨架礁.在面向深水盆地的台缘外带,以发育中～高能粒屑滩和骨架礁组合为特征.在背靠开阔海台地的台缘内带,主要表现为中低能粒屑滩、隐藻灰泥丘以及障积礁的组合.这个台缘镶边沉积体系总体上沿塔中1号断层西侧呈北西一南东向长带状展布,长度100多公里,是本区重要的油气聚集带之一.储层质量台缘外带总体上优于台缘内带,其中骨架礁礁核和粒屑滩灰岩最好,礁间海和滩间海沉积物较差.
The margin of the upper-middle Ordovician carbonate platform in the Tazhong area of Tarim Basin is characterized by a well-developed striped sedimentary system consisting of a multitude of granulite and bio-reefs, and a fine single well facies analysis identifies sand littoral , Gravelly littoral beaches, swarms and oolitic beaches, and three different types of reefs are distinguished: ① cryptophytes; mud mounds; ② barrier-covered reefs that are predominantly dendritic bryozoans, sponges, and / or corals ; ③ skeleton reefs built of stony sponges, trays, stratospora, coral, pipe-hole algae, etc. are characterized by the combination of developing middle-high-energy grain-rock litter and skeleton reefs. The inner margin of the margin of the platform that lies against the open sea platform is mainly composed of a combination of low- and medium-sized debris-borne beaches, alluvial-gray mud mounds and barriched reefs. The margin margin depositional system is generally along the west side of the Tazhong No.1 fault It is one of the most important hydrocarbon accumulation belts in the region, with a belt length of more than 100 km distributed along the NW-SSE belt. The outcrop of reservoir quality rim margin is generally better than that within the rim margin, with the reef core and The finest littoral limestones are best, with less sediment in the reefs and beaches.