摘要
松辽盆地王府断陷登娄库组致密碎屑岩气藏隔夹层发育,具有多套气水旋回,压裂开发难度较大。为了实现高效生产,利用登娄库组岩心测试、偶极横波及常规测井等资料,采用层次分析法确定了储层可压裂性敏感参数及各敏感参数权重,并在可压裂级别划分的基础上,建立了针对隔夹层发育的致密碎屑岩气藏薄储层可压裂高度预测方法。研究表明:王府断陷登娄库组致密薄储层可压裂性评价的敏感参数有脆性矿物含量、脆性指数、杨氏模量和泊松比,且脆性矿物含量高、脆性指数大、杨氏模量高、泊松比低的储层段往往可压裂性较好;当综合压裂系数I_(cr)>0.55时,储层压裂级别为Ⅰ级,适合压裂开发;利用本文建立的方法预测C11井登娄库组压裂高度效果较好,当压裂压力为33.5 MPa时,目的层段压裂高度为7.125 m,且不会造成出水,预测结果与实际压裂结果相符合。研究成果为王府断陷登娄库组及相同类型致密气藏的有效开发提供了技术依据。
Tight clastic gas reservoir of Denglouku Formation in Wangfu fault depression,Songliao Basin,ischaracterized by well-developed interlayers,multiple sets of gas water cycles and great difficulty in fracturing development. In order to overcome these difficulties for efficient production,combined with the data of core analysis,dipole shear wave and conventional logging,analytic hierarchy process was used to determine the parameters which are sensitive to reservoir fracturing property and their weight. The prediction method of fracturing height for tight clastic gas reservoir with interlayer well-developed was established after dividing fracturing grade. The results show that the sensitive parameters of fracturing evaluation for the tight and thin reservoirs of Denglouku Formation in Wangfu fault depression are brittle mineral content,brittleness index,Young's modulus and Poisson's ratio. Reservoirs with high content of brittle minerals,large brittleness index,large Young's modulus and low Poisson'ratio often have good fracturing property. When the comprehensive fracturing coefficient is greater than0.55,the reservoir fracturing grade is grade I,which is suitable for fracturing development. There is a good application effect on predicting the fracturing height of Denglouku Formation in well C11 by this method. The fracturing height of the target zone is 7.125 m without water in the exploration process when the fracturing pressure is33.5 MPa. The prediction results are in accordance with the actual fracturing results. The research results provide a technical basis for the effective exploitation of tight gas reservoirs.
引文
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