Lithologic Reservoirs ›› 2007, Vol. 19 ›› Issue (1): 39-45.doi: 10.3969/j.issn.1673-8926.2007.01.007

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Depositional filling models and controlling factors on Mesozoic and Cenozoic fault basins of terrestrial facies in eastern China:A case study of Dongying Sag of Jiyang Depression

YU Xinghe1, J IANG Hui1, LI Shengli1, CHEN Yongqiao2   

  1. ( 1. School of Energy Resource, China University of Geosciences;2. Yangtz e Univ ersity )
  • Online:2007-03-15 Published:2007-03-15

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Abstract:

A majority of oil and g as reserves have been discovered that are located in the Mesozoic a nd Cenozoic fault basins of terrestrial facies in eastern China. These basins have different sizes and types with great discrepancy of reserves, whereas most of oil and gas fields that have been discovered and developed are obvious structural trap. With the continual enhancement of Chinese hydrocarbon exploration activity,the difficult increasing and type transferring,the targets of hydrocarbon exploration have been changed to subtle li thologic and stratigraphic trap. Therefore it is much necessary to analyze and research the characteristics of depositional filling at different structural zone during different evolutive phrases in this basin in order to provide geological theories and science evidences for the exploration of lithologic and stratigraphic trap.Dongying Sag belongs to Jiyang Depression of Bohaiwan Basin, which is a typical lake basin of half-garben with the terrestrial coarse clastic deposits. The depositional filling pattern and extensional characteristic of sandstone within Dongying Sag are very representative to study this type of basin.So,the paper emphasized that Dongying Sag has been analyzed from both spatiality and timein the view of sedimentology. A set of corresponding relationship has been expatiated that structural characteristic directly controls the depositional filling characteristics,climate straightly determines the property of deposits, sediment supply and lake-level changes mainly dominate the patterns of spatial depositional filling.The depositional filling model and corresponding relationship in the v arious structural zones during each evolutive stage have finally been summed up. These results can provide help and evidences for hydrocarbon generation and distribution in faul t basin of terrestrial facies.

Key words: Nanzhuang area, Triassic, Chang 6, reservoir feature, properties, pore structure

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