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Diagenesis of Dongying formation in Liaodong upliftand and its effects on reservoir quality of sandstone

Zhang Wenkai;Lyu Zhengxiang;Shen Zhongmin;Liu Sibing;State Key Laboratory of Oil and Gas Reservoir Geology and Exploration,Chengdu University of Technology;School of Energy Resources,Chengdu University of Technology;  
In order to identify the sandstone reservoir features of Dongying formation in Liaodong uplift,researches are conducted on the petrologic features,the diagenesis features and its effects on reservoir by polarizing microscope,scanning electron microscope,rock pyrolysis,X-ray diffraction,temperature measuring of fluid inclusions and so on.It turns out that the main rock types of the reservoirs of Dongying formation are lithic arkose and feldspar lithic sandstone with low matrix content.The diagenesis stages of reservoir in the target area is between early diagenesis B stage and middle diagenesis A stage.The main diagenesis includes compaction,cementation,and dissolution.The early compaction,early calcite cementation and mid-late authigenic kaolinite filling are major factors to destroy the pore reservoir.The mid-late feldspar dissolution is an important diagenesis in reforming the reservoir physical property.The amount of primary pore is controlled by the sedimentation and the transformation of primary pore and the content of secondary porosity are determined by diagenesis.This study will provide the supports to the oil and gas exploration of the Dongying formation in Liaodong uplift,and it is helpful to reservoir researches in other areas of Liaodong Bay with similar characteristics.
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