冀中坳陷晋县凹陷南部古近系沙四段－孔店组层序地层研究及油气勘探方向

充分利用已有的地震、钻井、测井、分析化验资料，应用层序地层学理论对晋县凹陷南部古近系沙四段一孔店组地层开展系统的层序地层学研究，建立了凹陷内不同位置的沉积模式，并对沉积相带展布及演化特征进行了分析，明确了下步油气勘探的有利方向。研究表明，晋县凹陷南部沙四段-孔三段为一个二级层序，其间可划分为3个三级层序、8个四级层序；发育有冲积扇、三角洲、扇三角洲、近岸水下扇及冲积平原5种沉积相类型；形成岩性类和构造一岩性类2个油气富集区，是下步油气勘探的重点区带。

Sequence Stratigraphy Research and Hydrocarbon Exploration Targets of Fourth Member,Shahejie Formation--Kongdian Formation,Paleogene in the South of Jinxian Sag,Jizhong Depression

According to the seismic, drilling, well logging, analysis and test data, the detailed sequence stratigraphic characteristics are researched about the fourth member of Shahejie Formation--Kongdian Formation of paleogene in the south of Jinxian sag by using sequence stratigraphic principle. The sedimentary models of different positions in the sag are established. At the same time, the sedimentary facies distribution and evolution characteristics are analyzed. The favorable direction of oil-gas exploration is determined. Research shows that the fourth member of Shahejie Formation--the third member of Kongdian Formation is a second-grade sequence, which can be divided into three third-grade sequences or eight fourth-grade sequences. Five kinds of sedimentary systems are identified in this area, which are alluvial fan, delta, fan delta, nearshore subaqueous fan and alluvial plain. Two lithologic and structural-lithologic oil-gas accumulation areas come into being, which are the key zone for oil-gas exploration.