Depositional Controls of Structural Fault Terrace: Examples from Seismic, Logging and Outcrop Data

CHENG Ri-hui; WANG Pu-jun; LIU Wan-zhu

Structural fault terrace is a kind of structural pattern developed on the margins of rift(especially in the early stage of rift)or fault basins reflecting step changes of depositional relief of slopes formed by different subsidence of marginal blocks. Some different types of fault terrace zones are interpreted from seismic profile under which we interpret seismic facies and sedimentary facies. Different types of fault terraces control different sedimentary types. The using of fault terrace may constrain the seismic interpretation with multiple resolutions. Well logging data may be used to test and confirm the controls of sedimentation on the terrace zones constraining seismic interpretation, and to study some details about sedimentary micro-facies and spatial distributions. The examples from seismic and well logging data are from Xujiaweizi fault depression of Songliao basin and Zhanhua sag of Bohaiwan basin. The example from field outcrop in Jiaolai Basin confirms this controlling process. Comparing with drilling and logging data, the information from outcrop is continuous and the analysis of outcrop may reveal details of sedimentation and stratigraphic architecture under control of structural fault terrace. Models of fault terrace and sedimentation may be applicable to oil and gas exploration.

Faculty of Earth Sciences in Jilin University, Changchun 130061

Received Date: 2002-04-23

Rev Recd Date: 2002-06-25

Publish Date: 2003-06-10

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Abstract: Structural fault terrace is a kind of structural pattern developed on the margins of rift(especially in the early stage of rift)or fault basins reflecting step changes of depositional relief of slopes formed by different subsidence of marginal blocks. Some different types of fault terrace zones are interpreted from seismic profile under which we interpret seismic facies and sedimentary facies. Different types of fault terraces control different sedimentary types. The using of fault terrace may constrain the seismic interpretation with multiple resolutions. Well logging data may be used to test and confirm the controls of sedimentation on the terrace zones constraining seismic interpretation, and to study some details about sedimentary micro-facies and spatial distributions. The examples from seismic and well logging data are from Xujiaweizi fault depression of Songliao basin and Zhanhua sag of Bohaiwan basin. The example from field outcrop in Jiaolai Basin confirms this controlling process. Comparing with drilling and logging data, the information from outcrop is continuous and the analysis of outcrop may reveal details of sedimentation and stratigraphic architecture under control of structural fault terrace. Models of fault terrace and sedimentation may be applicable to oil and gas exploration.

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Reference (11)

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Depositional Controls of Structural Fault Terrace: Examples from Seismic, Logging and Outcrop Data

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