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• W2350052318 abstract "Based on drilling cores of volcanic rocks in 32 wells with a total length of 11 431 m and the cuttings and well logging data,the volcano lithology,lithofacies,vertical sequence and eruption stage of Dongying Formation have been studied by volcano stratigraphical seismic-well correlation. The isopach map of volcanic rocks is sketched out based on the information of volcanic rocks in 225 wells with a total length of 56 923 m. More than600 measured porosity and permeability data of 43 wells are compared in order to study the reservoirs physical property of Dongying Formation volcanic rocks,and its relationship with the sedimentary rocks and the volcanic rocks of underlying the third member of Shahejie Formation. The results show that the volcanic rocks are mainly composed of basalt and trachyandensite,and divided into 5 eruptive stages with the eruption cycles of mafic-intermediate-mafic volcanic ones upwards. The spatial distribution of volcanic rocks is controlled by the main boundary faults,and the thickest volcanic rocks are formed at the intersection of Jiadong fault and its associated faults. The porosity and permeability descend with the increasing of burial depth for both volcanic rocks and sedimentary rocks. The regional burial depth is shallower than 2 500 m for the Dongying Formation,and the physical property of volcanic rocks are worse than interbedded sandstone but better than the volcanic rocks in 2 500 m for the third member of Shahejie Formation. The relationship between Dongying Formation volcanic rocks and reservoirs are is that: 1The averaged porosity and permeability( φ = 15%,K = 0. 4 × 10- 3μm2) for Dongying Formation volcanic rocks are worse than its interbedded sandstone( φ = 21%,K = 29 × 10- 3μm2). 2 The reservoirs physical property of Dongying Formation volcanic rocks are better than the volcanic rocks in the third member of Shahejie Formation( φ = 10%,K =0. 45 × 10- 3μm2). The volcanic rocks act as cap rocks in the Dongying Formation,and as reservoir rocks in the third member of Shahejie Formation. The controlling factor in determining volcanic rock as reservoir or cap is the relative level of porosity and permeability compared to the interbedded sedimentary rocks." @default.
• W2350052318 created "2016-06-24" @default.
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• W2350052318 date "2015-01-01" @default.
• W2350052318 modified "2023-09-24" @default.
• W2350052318 title "Characteristics of volcanic rocks from Dongying Formation and their sealing effects in eastern depression of Liaohe Basin" @default.
• W2350052318 hasPublicationYear "2015" @default.
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