The Study about the Sequence Stratigraphic Sracture of Kongdian Formation in Kongnan Area

Based on the characters of terrestrial sequence stratigraphy showed from seismic section,electric logging curves and types of rock association,the Kongdian Formation in the downthrow block of Kongdong Fault of Kongnan area can be divided into two second-order sequences and four third-order sequences,and three system tracts can be identified in each sequence.Combined with the structure characters,the types of different sequence boundaries are summed up.It concludes that the territorial angle unconformity is second-order sequence boundary and the local structural unconformity and sedimentary-structural unconformity are third-order sequence boundary.On the basis of the characters of sequence and sedimentary,the reservoir distribution characters of each system tract of different sequences are analyzed preliminarily,and also the oil and gas reservoir types are predicted accordingly.