金湖凹陷金南—腰滩地区戴南组一段高分辨率层序构型与砂体展布特征

The Sequence Architecture and Characteristics of Sandbody Distribution of the First Member of the Dainan Formation in Jinnan-Yaotan Block of Jinhu Depreesion

应用高分辨率层序地层学理论、技术方法，综合地震、钻井岩芯及测井资料对金湖凹陷金南-腰滩地区戴南组一段进行了高分辨率层序地层研究，识别出层序界面和洪泛面两类转换面，并进一步划分出1个长期、2-3个中期及4-7个短期旋回层序，短期、中期旋回层序以向上“变深”型和向上“变深”复“变浅”型为主，向上“变浅”型不发育，长期旋回层序则以向上“变深”复“变浅”为主。在此基础上，依据旋回等时对比法则，建立了研究区戴南组一段层序地层格架，对各中期旋回层序砂体进行了等时追踪对比，发现MSC3时期金南地区吕庄构造带及腰滩石港断裂上升盘沉积缺失，砂体主要沿金南工区西部及石港断裂下降盘呈条件状展布，地层超覆特征明显，此类砂体是隐蔽油藏勘探的有利目标。

By using the high resolution sequence stratigraphy theory, the sequence stratigraphy for the first member of Dainan Formation in Jinnan-Yaotan block of Jinhu Depression is analyzed together with comprehensive research of seismic, core and well logging data. Two kinds of transitional surface, sequence boundary, and flooding surface are recognized. And the aimed segment is divided into one long-term cycle, two to three intermediate term cycles and four to seven short-term cycles. The main types of the short and intermediate term are upward-deepening, and upward-deepening then to upward-shallowing. The long term is upward- deepening then to upward-shallowing. Based on the principle of isochronic correlation, the sequence stratigraphic framework of the first member of Dainan Formation is established, and the sandbodies of intermediate term cycles are tracked and correlated. The result shows that the upside of Shigang Fault and the Lvzhuang tectonic zone are loss of the MSC3, the sandbodies are mainly distributed in the west of Jinnan area and the downside of Shigang Fault, the character of stratigraphic onlap is apparent. This kind of sandbody is a very favorable target for subtle reservoir exploration.