Study On Pore Characteristics And Evolu Tion Of Volcanic Reservoir In One Paragr Aph Yingcheng Formation Of Xingcheng Area

With the continuous improvement of exploration theory and technology, vo lcanic reservoirs have been found in the major basins in the world.At present,t here has been a great breakthrough in the exploration and development of volc anic reservoirs,and the study of volcanic reservoir has become a new field of oil and gas exploration at home and abroad in recent years.Volcano rock reserv oir is complicated and special problems need to strengthen and explore the vol cano rock reservoir pore characteristics and evolution of new breakthrough prog ress volcano rock reservoir geology and volcano rock reservoir potential explor ation and development has important significance.Based on the study of petrology volcano on the detailed,accurate identifica tion and quantitative evaluation of different types of rocks in the main pore ty pes,and different types of rocks in the main pore combination,recognition and t he establishment of pore evolution sequence.The use of fluid rock interaction,p hysical function and quality balance principle,phase equilibrium and thermodyna mic theory and methods of the volcano rock devitrified pore and dissolved por e are studied;a detailed study of volcano rock formation of secondary minerals mainly secondary pore types and distribution,and the evolution mechanism,esta blishment of volcano rock reservoir evolution model,and then discuss reservoir distribution.The following conclusions are obtained from the comprehensive rese arch:No. 1.The study area volcano rock type variety,has a direct relationship wit h the magma composition,temperature, nature, eruption,magma eruption due to different species,can form different types of rocks,the 8 wells rock chemical an alysis data show that the volcano rocks in acidic rocks erupted,followed by ne utral volcanic rocks.No.2.There are 17 kinds of secondary minerals in the volcanic rocks in th is area.The types of secondary minerals are related to the types of rocks.No.3.According to the statistics of effective reservoir thickness of 107 laye rs in the first section of the formation in the Xingcheng area,we can see that t he effective reservoir is mainly in the explosive facies,and the second is the o verflow facies.No.4.The most basic pore types of volcanic rocks in this area are 3 kinds of primary pore,secondary pore and fissure.The primary pores are mainly pore s and intergranular pores,and the secondary pores are mainly composed of 2 ty pes of pores,pores and pores.The pore types,such as volcanic ash dissolution po re and gravel inner pore,can be formed by the combination of the most basic pores.No.5.The identification and the establishment of the pore formation and ev olution sequence,the geological events and petrological evidence was discussed on the basis of the evolution of porosity, the porosity development of the law,put forward 6 stages of pore evolution,and establishes the model of pore evol ution.