苏20区块河流相砂体刻画方法研究及应用

Research and application of the description method of fluvial sand body in block Su 20

随着苏里格气田勘探开发不断深入,储量动用程度越来越高,天然气富集区提高采收率成为气藏稳产的重要技术手段。由于剩余气分布零散,特别是在河流相致密砂岩气藏中,储集层具有砂体纵横向变化快、物性差异大、气水关系复杂、非均质性强等特点,原复合砂体研究已不能满足气田开发要求。为此,基于苏里格气田苏20区块特点,综合运用单一河道砂体识别、叠置泛河道砂体定量化解析、主河道方向预测、辫状河心滩空间解析、有效砂体定量表征及密井网区砂体精细解剖等方法,开展苏20区块河道砂体刻画技术研究,夯实精细地质研究基础,确定剩余气分布特征,并实施富集区井网优化,从而实现区块高效开发。

With the deepening of exploration of Sulige Gas Field,the reserves production gets higher and higher,and the enhancement of recovery rate in natural gas-rich areas has become an important technical means for stable production of gas reservoirs.Due to the scattered distribution of remaining gas,especially in fluvial tight sandstone gas reservoirs,the reservoir is of rapid vertical and horizontal changes of sand body,large physical property different,complex gas-water relationship,and strong heterogeneity.Research on original composite sand body can no longer meet the requirements of gas field development.To this end,based on the features of block Su 20 in Sulige Gas Field,single-channel sand body identification,quantitative analysis of overlapped pan-channel sand body,prediction of main channel direction,spatial analysis of braided river island,quantitative characterization of effective sand bodies and fine analysis of sand bodies in dense well pattern areas are comprehensively applied to study the description techniques of the river sand body in block Su 20 to consolidate fine geological research,determine distribution features of remaining gas,and optimize well patterns in enrichment area,so as to achieve efficient development of the block.