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Liu S.G.,State Key Laboratary of Oil and Gas Reservoir Geology and Exploration | Qin C.,State Key Laboratary of Oil and Gas Reservoir Geology and Exploration | Sun W.,State Key Laboratary of Oil and Gas Reservoir Geology and Exploration | Wang G.Z.,State Key Laboratary of Oil and Gas Reservoir Geology and Exploration | And 4 more authors.
Acta Petrologica Sinica | Year: 2012

Dengying Formation of Late Sinian age located in the Sichuan Basin was deeply buried and its paleo-oil pool (gas generating center) was transformed into paleo-gas pool (gas accumulating center) and present gas pool (gas preserving center). Paleo-oil pool was the main "hydrocarbon source" for the paleo-gas pool which was also the main "hydrocarbon source" of present gas pool. The formation ol paleo-oil pool was controlled by the occurrence and location ol source rocks (hydrocarbon generating center). Therefore the formation of present natural gas pool in the Upper Sinian Dengying Formation was determined by the coupling process of hydrocarbon generating center, gas generating center, gas accumulating center and gas preserving center, under the control of multiphase tectonic activities. The key factors ol petroleum accumulation and preservation was plentiful hydrocarbon sources and belter preservative conditions (good seal development). That is, both source rock and sealing condition could have controlled hydrocarbon accumulation simultaneously. Being controlled by the structure and sedimentary background of the early basin, hydrocarbon generating center appeared to have been stationary in the space, while the other three centers were not. Therefore, the spatial relationship between the "three centers" (gas generating center, gas accumulating center and gas preserving center) decided the linal result ol oil and gas accumulation.

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