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Tectonic Evolution And Petroleum Accumulation Of South Song Liao Basin

Posted on:2006-02-05Degree:DoctorType:Dissertation
Country:ChinaCandidate:M D YangFull Text:PDF
GTID:1100360155977560Subject:Structural geology
Abstract/Summary:PDF Full Text Request
The author systematically studied the area structural features, the structural evolution history and typical structure belts in the exploration area. Combined with the oil-gas generation, migration and time-space distribution relation, the author studied the evolution of basin structure, the types of the structure belts, structure styles and their relations with the accumulation of oil-gas. Song-Liao basin belongs to the area that was intensely deformed in the plate during Mesozoic and Cenozoic. The evolution of the basin has a mechanism that alternated between extension and contraction. The basin experienced three main evolution stages, which were the early fault depression in the late Jurassic, the middle depression in the early Cretaceous and the late uplift and folds in the late Cretaceous or Paleogene Song-Liao basin experienced a multi-period of extension and contraction from late Jurassic to late Paleogene. For example, under the extension setting it mainly contains two main extension periods that are Huoshiling-Yingcheng group and Denglouku-Nenjiang group. Under the contraction setting it mainly contains Late Mingshui group period and late paleogene and others, which are the uplift and dome period. Fault, as one of the important oil-gas vertically migration and accumulation places, provided channels that migrated the oil from the depression to the basin margin. It can block off the oil-gas. It also has a division effect on the oil accumulation. It is the escaping window for the oil-gas too. The positive round back structure is benefit for the accumulation and it is one of the important oil-gas reservoir belts. The structure disconformity plane is one of the important places for oil-gas accumulation, and it also is the main horizontal migration channel. Structural activities controlled the oil-gas thermo evolution and improved the rock's storage capacity. The uplifting erosion and fault formed by the structure activity can deform the roof rock. The syncline is benefit for the oil-gas accumulation under definite conditions, so are the successive pale-domes. Because of the structural activities, the monocline setting such as nose-structure can become the oil-gas accumulation place. At last, based on the principle that structures controlled the oil-gas, combined with other petroleum geological conditions, the author predicted the structures that are benefited for the oil-gas accumulation in the Dehui fault depression.
Keywords/Search Tags:the south of Song-Liao basin, structural evolution, faults, oil-gas accumulation, subsiding history, structure belts
PDF Full Text Request
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