Sedimentary Anatomy of Thick Anisotropic Sandstones for Chang 8 Oil Formation in Longdong Area ,Shaan-Gan-Ning Basin

ZHENG Xi-min; SONG Guang-shou; WANG Duo-yun; LI Feng-jie; WANG Zhi-kun; LI Shu-tong; WANG Feng; LIU Zi-liang

The thick sandstones in Chang 8 oil Formation of Yanchang group may be divided into two types by the research on sedimentary petrology and sequence stratigraphy. One is made up of single genetic distributary channel sandstones that is stacked with multiple stages sandstone. The other is consist with many microfacies , including underwater distributary channel, river mouth bar, sheet sand over mouth bar and slump sandstone. They pile up as thick sandbody by different stacking patterns. It has been first proposed that only the sandstone called as sheet sand over mouth bar may become high-quality reservoir with relative high porosity and permeability under the background of high accommodations and high sediment alimentations.

1. Lanzhou Institute of Geology, Chinese Academy of Sciences,Lanzhou 730000;

2. Second Oil Production Factory, Chang-Qing Corporation, Qingyang Gansu 745100

Received Date: 2003-01-27

Publish Date: 2003-06-10

Key words:

Abstract: The thick sandstones in Chang 8 oil Formation of Yanchang group may be divided into two types by the research on sedimentary petrology and sequence stratigraphy. One is made up of single genetic distributary channel sandstones that is stacked with multiple stages sandstone. The other is consist with many microfacies , including underwater distributary channel, river mouth bar, sheet sand over mouth bar and slump sandstone. They pile up as thick sandbody by different stacking patterns. It has been first proposed that only the sandstone called as sheet sand over mouth bar may become high-quality reservoir with relative high porosity and permeability under the background of high accommodations and high sediment alimentations.

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Sedimentary Anatomy of Thick Anisotropic Sandstones for Chang 8 Oil Formation in Longdong Area ,Shaan-Gan-Ning Basin

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