鄂尔多斯盆地东缘临兴地区太原组桥头砂岩层序地层及沉积特征

doi:10.11743/ogg20180107

Abstract

Abstract: Sedimentary characteristics and location within sequence framework of the Qiaotou sandstone of the Taiyuan Formation in Linxing area, eastern margin of Ordos Basin, determine the reservoir type and trap area.The Taiyuan Formation is divided into one complete long-term cycle (LSC1) and four complete medium-term cycles (MSC1, MSC2, MSC3, MSC4) based on identification of sequence boundaries and flooding surfaces by using seismic, logging, outcrop and outcrop data.The Qiaotou sandstone is within the descending half cycle of MSC1 and is dominated by coarse-grained and coarse-to-medium grained quartz sandstones.The cumulative probability curve of the grain size is typical of the two-way flow.Core observation reveals typical tidal current sedimentary structure and pinnate, massive, graded and composite bedding.The sand bodies show lenticular geometry on section and appear as bands parallel with shorelines on map.The Qiaotou sandstone is believed based on a comprehensive analysis to be tidal channel and barrier bar deposits, which are quality reservoirs of marine facies.The sand body parallels shoreline in northwest-southwest direction and all wells that penetrate it test high gas flow.The area of traps are controlled by the sand body boundary and show the characteristics of lithologic traps.This study is of great significance for guiding exploration and development of tight sand gas in Linxing area, eastern margin of Ordos Basin.

Key words: sedimentary facies, Qiaotou sandstone, sequence stratigraphy, Taiyuan Formation, Ordos Basin

CLC Number:

TE121.3

Wu Peng, Gao Jixian, Guo Junchao, Zhou Yuzhe, Hu Xiaoxian. Sequence stratigraphy and sedimentary characteristic analysis of Qiaotou sandstone of Tayuan Fm in Linxing area, eastern margin of Ordos Basin[J]. Oil & Gas Geology, 2018, 39(1): 66-76.

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Sequence stratigraphy and sedimentary characteristic analysis of Qiaotou sandstone of Tayuan Fm in Linxing area, eastern margin of Ordos Basin

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