辽河外围陆家堡凹陷庙31块九佛堂组下段特殊岩性储层特征及成因机理Characteristics and Genetic Mechanism of Special Lithology Reservoir of Lower Member of Jiufutang Formation in Miao 31 Block of Lujiabao Concave, Liaohe Peripheral Basins
辽河外围盆地, 庙31块, 硅化凝灰岩, 储层, 成因机理Liaohe Peripheral Basins, Miao 31 Block, Silicified Tuff, Reservoir, Genetic Mechanism
《Advances in Geosciences》, Vol.4 No.6, 2014-12-30
Lower member of Jiufutang formation is the main oil layer of Miao31 block in Lujiabao concave of Kailu of Liaohe peripheral basins. Sedimentation is the main activity with decreased volcanic eruption, formed volcanic rocks and tuffaceous sandstone. With extremely complicated rock composition, the control factors and mechanism of the reservoir development were hardly known. Therefore, starting with basic experimental analysis, we deeply develop lithological characteristics, reservoir characteristics, genetic environment and other researches. By a comprehensive ap-plication of rock thin-section identification, X-ray diffraction analysis, casting body slice image analysis, physical property analysis and other analyses and testing technology, the characteristics and genetic mechanism of special lithology reservoir of lower member of Jiufutang formation in miao31 block of Lujiabao concave of Liaohe peripheral basins were studied. We consider that sili-cified tuff is the main reservoir rock of lower member of Jiufutang formation in Miao31 block, the forming mechanism of this special lithology reservoir is the joint action of volcanic activities and siliceous hydrothermal. Its reservoir space is mainly residual inter-granular pore, dissolved pore and fracture. The special lithology reservoir is ultra-low and low porosity and permeability re-servoir, middle porosity and permeability reservoir takes second place. It has a few high permea-bility reservoirs.