Lithologic Reservoirs ›› 2011, Vol. 23 ›› Issue (4): 41-47.doi: 10.3969/j.issn.1673-8926.2011.04.008

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Characteristics of sedimentary facies and sequence stratigraphy of Changxing Formation in Fuling area, southeastern Sichuan Basin

GUO Chuan1， LI Guorong 1，2， YANG Yingying1， XIE Fachuan1， DONG Wenyu1， TANG Meng3   

  1. 1. College of Energy Resources， Chengdu University of Technology， Chengdu 610059， China； 2. State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation, Chengdu University of Technology, Chengdu 610059， China； 3. No.1 Oil Production Plant， CNPC Changqing Oilfield Company， Xi’an 717400， China
  • Online:2011-08-20 Published:2011-08-20

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Abstract:

Based on the knowledge of sedimentary and tectonic settings of Changxing stage in Fuling area in southeastern Sichuan Basin, under the guidance of the theory of classical sequence stratigraphy by Vail and high resolution sequence stratigraphy by Cross, by using outcrop, core and well logging analysis, the sequence boundary surface, facies sequence, stacking pattern and log curves are analyzed, and Changxing Formation in Fuling area is divided into two third-order sequences. The vertical and plane distribution of sedimentary facies of Changxing Formation in the sequence framework in Fuling area is studied, and the distribution of reef and shoal in Changxing stage is analyzed from the aspect of sequence evolution. The result shows that the reef and shoal bodies did not develop during the transgressive system tract phase in the third-order sequence of lower Changxing Formation in Fuling area, and then they developed fairly during the highstand system tract phase; reef and shoal bodies developed during the sedimentary stage of the third-order sequence of upper Changxing Formation, but their developing scales during transgressive system tract are signifi-cantly less than that during the highstand systemtract.

Key words: high resolution sequence stratigraphy, base level cycle, seismic attributes, impedance inversion

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