摘要
四川盆地烃源十分丰富。但油气演化程度高,大多已进入高成熟和过成熟阶段,至今只在侏罗系发现有油藏,三叠系及其更老地层皆为气藏。储层主要为碳酸盐岩,其特点是低孔低渗,平均孔隙度仅1.7%,平均渗透率小于1×10^(-3)μm^2,但其中的“孔洞发育层段”平均孔隙度可达3%～6%。根据四十年的勘探经验,加强预探并争取新发现是四川盆地油气勘探发展的关键。预探中,按构造带规划大中型气田勘探目标,将成藏条件相似、地域上相邻的局部圈闭群作为一个整体勘探对象,实行稀井广探,少井高效。“八五”以来,在高陡构造带勘探技术、储层横向预探技术等方面有长足的进步,勘探成效不断提高,实现了资源序列的良性循环。
There is plenty of source rock in Sichuan Basin.Owing to its high evolution,high or over maturity,oil pools only have been discovered in Jurassic,in Triassic or even older beds only dis- covered gas pools.The dominant reservoir is carbonate rock characterized by poor porosity,1.7% on average,and poor permeability,less than 1×10^(-3)μm^2 in common.The average porosity may reach up to 3%～6% in intervals developed with pores and caves.Based on 40 year exploration experience,it is considered that it is a key job of oil-gas exploration in Sichuan Basin to strengthen preliminary exploration and get new discovery.In preliminary exploration,the goals of large- medium size of gas pools are planned according to structural zones,the traps with similar conditions or adjacent location are considered as a whole,carry out wide exploration with very a few wells.Since the eighth-five-year-plan,marked progresses have been achieved in exploration technique of high-steep structural zones and reservoir transversal prediction,which make the exploration results getting better.
出处
《海相油气地质》
1997年第2期22-30,共9页
Marine Origin Petroleum Geology
关键词
碳酸盐岩
油气勘探
油气藏
盆地
Carbonate rock
Oil and gas exploration
Preservation
Exploration history
Exploration result
Technique
Sichuan Basin
