鄂尔多斯盆地子洲及邻区山西组二段高分辨率层序地层和煤沉积模式

doi:10.11743/ogg20130108

Abstract

Abstract:

The Shanxi Formation of Ordos Basin is regarded as an exploratory target for it is rich in both coal and natural gas.The second member of the Formation (Shan-2) pertains to delta sedimentary system of a lake basin.The distributary channel sandbodies in the Shan-2³ sub-member are the major pay zones of the Zizhou gas field.The Shanxi Formation in the gas field and its adjacent areas can be divided into 2 long-term basal level cycles;4 medium-term basal level cycles and 8 short-term basal level cycles.The structures of 5 short-term basal level cycles have been identified.During the division of medium-short term cycles,the writers not only employed identification methods of sequence boundary,lake flooding surface,and deposition cycles,but also took into conside-ration the positions of coal beds from delta sedimentary system in high-resolution sequence stratigraphy.Shoreline trajectory analysis was combined with research of coal sedimentary mode to exactly reconstruct the evolution of the coal deposition environment in the Shan-2³ sub-member in the areas.The Shan-2³ sub-member is the product of delta deposition environment with intermittent lake transgression-regression as the feature.There had been 4 short periods of lake transgression-regression and created environments for the deposition of 4 coal layers in the lower deltaic plain.Among the 4 short-term transgression-regression cycles,the last one is the most extensive and during the time the lower deltaic plain turned to swamp peat,forming the thick 5^# coal-bed that is distributed almost in the whole study area.

Key words: Shoreline trajectory, delta, coal depositional mode, high-resolution sequence stratigraphy, Shanxi Formation, Zizhou area, Ordos Basin

CLC Number:

TE121.3

Yang Yong, Lei Bianjun, Feng Yongjiu, Meng Kun, Chen Bo, Ye Wu. High-resolution sequence stratigraphy and coal sedimentary modes of Member 2 of Shanxi Formation in Zizhou and its adjacent areas,the Ordos Basin[J]. Oil & Gas Geology, 2013, 34(1): 58-67.

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High-resolution sequence stratigraphy and coal sedimentary modes of Member 2 of Shanxi Formation in Zizhou and its adjacent areas,the Ordos Basin

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