The Microscopic Characteristics Of Volcanic Reservoir In Yingcheng Formation To Huoshiling Formation Of Deep Wangfu Fault

The subject focused on the deep volcano rock reservoir in study area, utilizing laboratory analysis data and drilling core data to deeply explore the microscopic characteristics of volcano reservoir. Conclusions gained are as follows.The volcanic reservoir of Wangfu Fault is mainly in the bottom of Shahezi and Huoshiling. The volcano rocks are complicated in the study area. From acidic volcano rock to basic volcano rocks, and from lava to volcaniclastic rock, heavy volcano clastic rock and volcano clastic sedimentary rocks, there all exist drilling. Statistics show that neutral volcano rocks are the most in the study area, and acidic volcano rock comes the second. The basic volcano rocks amount to a very small percentage.The study shows that the volcano rock reservoir space in study area can be divided into three categories, including primary pores, secondary pores and fractures, and ten sub categories of primary pores, intergranular pore, mineral particle / fried crack and cleavage cracks, matrix dissolution pore, intragranular dissolved pore, intergranular pore, dissolved pores, structural fractures in the amygdala, dissolution fracture, native contraction joint in detail. Volcano lava usually develops primary pore, micro pores matrix dissolution pore, intragranular dissolution pore, micro pore intragranular, and so on. Primary pore and matrix dissolution pore play an important role in the volcano rock reservoir. The main reservoir spaces of the volcano clastic rock are grain(gravel) hole, matrix dissolution pore, phenocryst dissolved pore, and so on, but Cracks grow in various rocks.The diagenesis types that affect the volcano rock reservoir space in study area can be divided into volatile, compaction and pressure solution, dissolution, compaction, cementation, metasomatism and filling, dissolution, devitrification and recrystallization, and so on. Different diagenesis types have different impact on volcano rock reservoir. Volatile, dissolution, devitrification and recrystallization are significant effects to improve the capacity of volcano rock reservoir, while compaction, cementation, and filling reduce rock reservoir capacity in volcano to a large extent.