川东石炭系气藏成藏系统研究

RESEARCH ON THE PETROLEUM SYSTEMS OF CARBONIFEROUS GAS RESERVOIRS IN EA ST SICHUAN

本文应用成藏系统理论 ,对川东石炭系成藏有关的基本要素和成藏演化过程进行了综合分析 ,阐述了川东石炭系成藏系统的成因 ;同时结合川东石炭系的勘探现状 ,根据川东石炭系的沉积 ,构造发育史 ,生、储、盖组合特征 ,储层流体性质和压力场分布特征 ,将川东石炭系气藏划分为三大成藏系统 ;并根据成藏系统的成因 ,进而细分为 :过充注高阻、正常充注高阻、过充注低阻、正常充注低阻、欠充注低阻等 5个成藏系统亚类 ,指出它们的勘探风险依次增加。将成藏系统分类与勘探目标相结合 ,对降低勘探风险、提高钻探成功率、促进川东石炭系深化勘探具有重要意义。

In the paper,by use of the petroleum system theo ry,the basic factors related to Carboniferous reservoir formation in East Sichua n and its evolution process are comprehensively analyzed and the genesis of the petroleum systems of Carboniferous gas reservoirs in East Sichuan is stated;in c ombination with the exploration situation of Carboniferous in East Sichuan,the C arboniferous gas reservoirs are divided into three main petroleum systems accord ing to the characteristics of the sedimentation,structural history and source r e servoir seal assemblage,the reservoir fluid property and the pressure field dis t ribution character;and in light of the geneses of the three main petroleum syste ms,they may be subdivided into five petroleum subsystems,i.e.overcharge high res istance,normal charge high resistance,overcharge low resistance,normal charge lo w resistance amd undercharge low resistance subsystems,in which exploration risk s are successively increased.It is very very important for us to reduce explo ration risk,raise drilling success ratio and deepen Carboniferous explorat ion in East Sichuan to combing petroleum system classification with exploration targets.