成都平原储层分布和品质与天然气勘探开发

四川盆地西部已成为重要的天然气区。在前陆盆地演化过程中,沉积了厚达8km的碎屑岩。在沉积和成岩作用的双重影响下,由浅至深形成了常规和非常规两大类天然气储层,并可进一步划分为6+1级。主要产层为低渗透超致密砂岩,其渗透率和孔喉结构对上覆地层净压力很敏感。在围压渗透率和压汞数据分析的基础上,并与试井数据相对照,建立了以原地(地层)渗透率K_ms为主要标志的储层品质技术、经济分级,讨论了致密和超致密砂岩气藏勘探开发的难点和技术对策。

RESERVOIR DISTRIBUTION AND QUALITY OF THE CHENGDU PLAIN AND ITS NATURAL GASEXPLORATION AND DEVELOPMENT

WT5BZ]The West Sichuan Basin has become an important area of natural gas. In the evolution of the foreland basin, 8km thick clastic rock was deposited. Under the double effects of sedimentation and diagenesis, normal and anomalous two types of natural gas reservoirs can be formed frow shallow to deep strata. They can be further divided into 6 1 ranks. The major pay bed is low permeable ultra dense sandstone. Its permeability and pore throat texture are very sensitive to the net pressure of overlying strata. Based on the analysis of confining pressure permeability and mercury injection data, the technical and economical gradation of reservoir quality mainly marked by in situ (formation) permeability K ms is set up correlated to the well testing data, and the difficulties and technical strategies for the exploration and development of dense and ultra dense sandstone gas pools are discussed. [WT5HZ]