Sequence Stratigraphy And Subtle Oil-Gas Pool Mode Research In Continental Rift-Subsidence Basin

The Tectonic in Langgu depression is the most complex extensional raft lake basin, Jizhong. The oil and gas has been explored for 40years. A large number oil-gas pools controlled by structure factor has been found in the depression. As these achievements of exploration being, the structural trap of good shape, big area, shallow embedding, predominant being pool condition has been drilled. It is more and more difficult to find them and the explorational situation is facing a hard test. On the other hand, the resources hydrocarbon-generating ratio and is rather low and the residual hydrocarbon resources of Langgu depression is still large. So it can be thought to have more explorational potential, most of oil and gas are likely to be accumulated subtle traps with lower explorational degree. Thereby, the subtle oil-gas pools will become explorational target for keeping on dependable crop and increase production of resources in Langgu depression.On the basis of reading many research findings of the predecessors and sufficiency absorbing exploration achievements obtained in the past years of huabei oil company, and using the large number of cores, well logging, seismic data and other basic data, with the research of depositional and tectonic background, depending on basic theories of sequence stratigraphy, sedimentology, tectonics, seismostratigraphy, the sequence stratigraphy and depositional systems of Paleogene of Langgu depression are established in the first time. The sequence of Paleogene is one 1 st order sequence, three 2st order sequence, eleven 3st order sequence. A whole and perfect sequence may be divided four system tract, including lake filling system tract, lake expanding...