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Characters and influence factors on Archeozoic reservoir in the Chengbei 30 buried hills

YUAN Jing (Faculty of Earth Resource and Information,University of Petroleum,Dongying 257061,China)  
The main types of rocks and reservoir spaces,characters and influence factors of Archeozoic reservoir in the Chengbei 30 buried hills were studied by means of observation on cores,electronic scanning and thin-section analysis.There are four types of crystalling rocks in Archeozoic of the Chengbei 30 buried hills.The most developed fractures are in cataclastic metamorphic migrated biotite feldspar gneiss.The physical properties of those fractures are the best,and their productivities are the highest.The reservoirs under the unconformity between Art and Pt around 250 meters are the valuable ones,and the thickness of reservoirs is in the range of 100 meters to 150 meters.The fractures and micro-cracks are the main reservoir spaces for oil accumulation in the Archeozoic reservoir of the Chengbei 30 buried hills.The dissolving pores,including crystal dissolving pores,inter-crystal dissolving pores and crystal casting pores,and micro?-inter-crystal pores are the available reservoir spaces.The main influence factors on reservoir accumulation in Archeozoic reservoir of the Chengbei 30 buried hills include the lithology,cataclasis caused by faulting,magmatization caused by magmatite intrusion,weathering and dissolution in the deep formation.
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