超致密砂岩储层裂缝与含气性识别

Identification of Fracture and Gas-bearing Bed in Hypercompact Sandstone Reservoir

川西HX地区须二段储层属超致密砂岩储层。由于其非常致密 ,在测井曲线上储层孔隙空间以及所含流体的信息反映非常微弱 ,造成储层含气性识别非常困难。以实验分析结果为依据 ,建立了裂缝评价指标渗透率增大率 ,对超致密砂岩储层进行裂缝评价。在对测井曲线综合分析的基础上 ,筛选出对天然气反映敏感的测井信息进行储层聚类分析 ,对储层含气性差异作分类评价。最后 ,通过裂缝指标与聚类分析结果的综合研究 ,确定储层的含气性。

Reservoir in Xujiahe's second formation (T_3x 2) is a reservoir with hypercompact sandstone in western Sichuan where the reservoir configuration is mainly dependent on fractures. The logging information of pore and fluid is very faint because the sandstone is very compact. Based on the results of lab analysis, a fracture evaluation index-increment rate of permeability is built to evaluate the fracture of hypercompact sandstone reservoir. On the basis of analysing logging curves, culster analysis method is employed to analyse logging information which is sensitive to natural gas. This method evaluates differences of gas-bearing beds. Finally, through comprehensive research of fracture index and cluster analysis results, gas-beraring bed is determined.