Analysis and Isochronostratigraphic Correlation of High-Resolution Sequence Stratigraphy for Chang-6 Oil Reservoir Set in Zhidan Delta, Northern Ordos Basin

ZHENG Rong-cai; PENG Jun

On the basis of sedimentary comprehensive study of core and well logging, taking the high-resolution sequence stratigraphy theory from Cross T A. As an instruction through the technique of sedimentary dynamic analysis of sequence structure and stacking pattern of base-level cycle and using the classification system of six-grade division scheme of base-level cycle, the authors discuss in detail the high-resolution sequence stratigraphic characteristics of Chang-6 Oil Reservoir Set, Upper Triassic in Zhidan Delta developed in Northern Ordos Basin. In the study mentioned above, four grades and genetic types of base-level cycle interface can be recognized from the formation, which is of different occurrence characteristics, developmental scales and discriminating markers. Depending on the genetic characteristics of base-level cycle interface, the formation may be divided into four order cycle sequences supershort-term,short-term,middle-term and long-term cycle sequences. Among these sequences, the cycle sequences of supershort-term and short-tem may be ubdivided further into three basic types of sequence structure, including up-deepening non-symmetry, up-shallowening non-symmetry and symmetry from up-deepening to up-shallowienng, and into seven subtypes of low or high accommodation and non-complete or nearly complete symmetry. These basic sequence types and subtypes are of various stacking and distribution patterns in differentfacies belts of Zhidan Delta. The middle-term and long-term cycle sequences are usually of symmetric structures which develop complete depositional sequence of lacustrine transgressive-regressive cycle and distribute stably in the different facies belts of the delta. According to the high-resolution isochronostratigrahpic correlation of the turnround boundaries of the multi-order base-level cycles of Chang-6 Oil Reservoir Set, the chronostrata unit frameworks in different time scale can be built, which have different application significance in each stage of hydrocarbon exploration and development.

1 Chengdu University of Technology, Chengdu 610059;

2 Southwest Petroleum Institute, Nanchong Sichuan 637001

Received Date: 2001-07-04

Key words:

Abstract: On the basis of sedimentary comprehensive study of core and well logging, taking the high-resolution sequence stratigraphy theory from Cross T A. As an instruction through the technique of sedimentary dynamic analysis of sequence structure and stacking pattern of base-level cycle and using the classification system of six-grade division scheme of base-level cycle, the authors discuss in detail the high-resolution sequence stratigraphic characteristics of Chang-6 Oil Reservoir Set, Upper Triassic in Zhidan Delta developed in Northern Ordos Basin. In the study mentioned above, four grades and genetic types of base-level cycle interface can be recognized from the formation, which is of different occurrence characteristics, developmental scales and discriminating markers. Depending on the genetic characteristics of base-level cycle interface, the formation may be divided into four order cycle sequences supershort-term,short-term,middle-term and long-term cycle sequences. Among these sequences, the cycle sequences of supershort-term and short-tem may be ubdivided further into three basic types of sequence structure, including up-deepening non-symmetry, up-shallowening non-symmetry and symmetry from up-deepening to up-shallowienng, and into seven subtypes of low or high accommodation and non-complete or nearly complete symmetry. These basic sequence types and subtypes are of various stacking and distribution patterns in differentfacies belts of Zhidan Delta. The middle-term and long-term cycle sequences are usually of symmetric structures which develop complete depositional sequence of lacustrine transgressive-regressive cycle and distribute stably in the different facies belts of the delta. According to the high-resolution isochronostratigrahpic correlation of the turnround boundaries of the multi-order base-level cycles of Chang-6 Oil Reservoir Set, the chronostrata unit frameworks in different time scale can be built, which have different application significance in each stage of hydrocarbon exploration and development.

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Reference (14)

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Analysis and Isochronostratigraphic Correlation of High-Resolution Sequence Stratigraphy for Chang-6 Oil Reservoir Set in Zhidan Delta, Northern Ordos Basin

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