Application of well log cycle analysis in studies of sequence stratigraphy of carbonate rocks
Yi Haisheng1,2
1 Institute of Sedimentary Geology，Chengdu University of Technology，Chengdu 610059，Sichuan 2 State Key Laboratory of Oil/Gas Reservoir Geology and Exploitation，
Abstract Chengdu University of Technology，Chengdu 610059，Sichuan The Fischer Plot is a graphic method about analyzing numbers and thicknesses of meter scale cycle units or parasequences of carbonate platform successions.The method is used to analyze the stacking patterns and hierarchical architectures of high frequency cycles and then to define depositional sequence surfaces.This method has widespread application in field stratigraphic sections，but it meets obstacles and limitations in subsurface petroleum exploration districts.A new calculation method is proposed in this paper and the cycle numbers and thicknesses can be detected by means of well log data processing in any stratigraphic intervals.The interplays among amplitudes and periodicities of eustatic sea levels，subsidence rates，and sedimentation rates were discussed in detail according to numerical simulation results.It is suggested that ordered stacking patterns of high frequency cycles indicate low frequency sea level fluctuation pathways.This provides us theoretical basis to distinguish the third order depositional sequences and surface location with well depth.The Middle Triassic Leikoupo Formation in the northwestern Sichuan Basin is taken as a case study，processing methods and procedures were demonstrated using natural gamma ray logging data.Discriminant markers for depositional sequence surfaces and multiple cyclic hierarchies were presented by graphing cumulative departure curves from mean cycle thickness as a function of cycle number or well depth.
About author: Yi Haisheng，born in 1959，graduated from Chengdu University of Technology in 1989 with a doctoral degree.Now he is a professor at Institute of Sedimentary Geology，Chengdu University of Technology，and is mainly engaged in sedimentary geology.
Cite this article:
Yi Haisheng. Application of well log cycle analysis in studies of sequence stratigraphy of carbonate rocks[J]. JOURNAL OF PALAEOGEOGRAPHY, 2011, 13(4): 456-466.
Yi Haisheng. Application of well log cycle analysis in studies of sequence stratigraphy of carbonate rocks[J]. JOPC, 2011, 13(4): 456-466.
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