Formation And Occurrence Of Statigraphy Oil-pools In The Jiyang Super-Depression

As the development of the oil and gas exploration in Shengli prospect, stratigraphy oil-pools becomes the main object after structure and sand reservoir. Using the geological and geophysical data, the thesis analyses the classes and types of unconformity, and illustrates the accumulation models of overlapping stratigraphy trap composed by third unconformity in Nenocene/Eogene, in the Eogene, Eogene/pre-Eogene and unconformity barrier trap. By researching on the high resolution sequence stratigraphy, it founds the recognition methods for the line of overlapping depositional termination above the third unconformity, and proposes the description methods for relevant stratigraphy traps. Besides, it proposes some views for prospecting the profitable objects, and provides theory criterion and method technology for the further hydrocarbon exploration in Shengli field.It founds the traps'distribution law of the third unconformity overlap and the unconformity barrier. The four types of accumulation model illustrate the enrichment rule of stratigraphy oil-pools. The abundant oil source and vertical migration controls the accumulation of Neogene overlapping trap. The physical property of sand body and horizontal migration controls the accumulation of Eogene overlapping trap. The heavy crude barrier and horizontal migration controls the accumulation of Neogene/Eogene barrier trap. And the muddy barrier and multi-trend migration controls the Eogene stratigraphy trap.It develops two kinds of fine description methods including the geological statistics of stratum overlapping and denuded line and extrapolation by included angle. It forms the description technology of prestack inversion for reservoir wedge out, achieves the quantification forecast of stratigraphy oil-pools, and establishes the relevant description methods of stratum reservoir with different stratigraphy.Besides, it forms comprehensive evaluation technology called six steps method for stratigraphy oil-pools exploration. It includes that high precision sequence establishes framework, structure analysis divides block, unconformity shape decides target, sedimentary facies finds reservoir, three lines assemblage descript trap, and multidisciplinary analysis chose object.Using above new theory and new technology, it studies systematically the forming condition and hydrocarbon concentrated law of stratigraphy oil-pools in Zhanhua sag and Chenzhen sag in Shengli field, and prospects finely and descript the profitable objects. Exploration breakthrough and development are obtained in many blocks. And it shows wide exploration prospect.