Abstract
According to the thin sections of volcanic rocks, chemical composition analysis and log interpretation, and well data, it is determined that the volcanic rocks of Yingcheng Formation in Shengshen 2-1 block are mainly intermediate-acid volcanic lava and pyroclastic rocks. Through physical analysis of core samples, it is considered that Shengshen 2-1 block belongs to low-porosity and low-permeability reservoir. Microfracture-fracture is relatively developed in the compact section, and fracture is not developed in the porous section. Microfracture and reticular fracture can be seen in the thin section. Statistical analysis of porosity and density of volcanic reservoir shows that volcanic rock density below 2.53 can be used as reservoir. According to the relationship between reservoir space and gas content, the characteristics of volcanic lithology, lithofacies and reservoir space, the reservoir in this block can be divided into four types.
Highlights
According to the thin sections of volcanic rocks, chemical composition analysis and log interpretation, and well data, it is determined that the volcanic rocks of Yingcheng Formation in Shengshen 2-1 block are mainly intermediate-acid volcanic lava and pyroclastic rocks
The reservoir space of rhyolites mainly consists of pores, residual pores after the pores are filled and internal pores of almond, micro-pores generated by the devitrification of rhyolite glass, pores generated by the dissolution of feldspar and carbonate minerals, and microcracks developed locally
The reservoir space of fused tuff mainly includes the dissolution of volcanic ash, plastic cuttings and pores existing in the cuttings, residual pores after the pores are filled and the internal pores of almond, pores generated by the dissolution of feldspar and carbonate minerals, and micro-cracks developed locally
Summary
The volcanic rocks of yingcheng formation in block shengshen 2-1 are mainly intermediate-acid volcanic rocks, including pyromeride, rhyolite, perlite, trachy dacite, trachyte and basaltic trachyandesite and pyroclastic rocks, including Rhyolite fused tuff, Rhyolitic crystal tuff, Rhyolitic breccia tuff, Rhyolite volcanic breccias and agglomerate [1]
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