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Calculated Porosity of Volcanic Reservoir in Wangjiatun of the Northern Songliao Basin, NE China

Global Geology 2003年第2期8卷 138-140页

作者： Xuanlong Shan1, Chuanbiao Wan2, Rihui Cheng1, Wanzhu Liu11. College of Earth Sciences, Jilin University, Changchun, 130026 China 2. Daqing Exploration & Development Institute, Daqing, 163712 China College of Earth Sciences Jilin University Changchun 130026 China Daqing Exploration & Development Institute Daqing 163712 China

In Wangjiatun area of the Northern Songliao Basin, reservoir space can be divided into three types: primary pore, secondary pore and fissure according to their origins,which can be subdivided into eight subtypes: macro-vesicule, shrank primary vesicule, alteration pore, groundmass corrosive pore, normal structural crack, corrosive structural crack, filled structural crack and groundmass shrank crack according to texture and origin of the pore space. It has characteristic of double pore medium. Volcanic porosities of small diameter samples (with diameter of ca. 2.5 cm) and large diameter samples (with diameter of ca. 21.5 cm) were tested in accordance with the characteristic of volcanic reservoir space. Volcanic porosities for small diameter samples correspond with matrix porosities and those of large diameter samples correspond with total porosities including matrix and fractured porosities. Models of the calculated porosity by acoustic wave or density of volcanic reservoir are established in view of those measured data. Comparison of calculated and measuredporosities shows that precision of calculated porosities is lower for rhyolite and tuffites, and higher for basaltand andesite. Relative errors of calculated porosities by model of large diameter samples are lower than those of small diameter samples, i. e. precision of the former is higher than that of the later.

关键词： Songliao Basin, volcanic reservoir, reservoir space, calculating models of porosity

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