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四川盆地川西坳陷陆相致密碎屑岩气藏储层具有致密、低孔渗、薄层交互、多层叠置和强非均质性的特点。长期以来,勘探成功率低、效益差。近年来,以高精度三维地震资料为主,多学科协同,深入研究含气地 震响应特征,充分利用地震资料信息,取得了一系列油气勘探开发的重大进展。其间,储层空间展布刻划技术起到了十分关键的作用。文章从储层基本地质特点,含气砂体地震响应模式建立,储层展布预测,储层边缘检测及空间展布刻划等方面,结合川西地区致密非均质气藏勘探的实践经验详细介绍了实现储层空间展布刻划的系列技术。

Describing the Space Distribution of the Heterogeneous Tight Gas Reservoirs in West Sichuan epression

It is well known that tight clastic reservoirs of land facies in West Sichuan depression,Sichuan Basin,have such features as compactness,low porosity and low permeability,cross bedding of thin layers,multi layer nappe and high heterogeneity.These facts result in undoutably low profit and low success ratio of exploration in the past.In recent years,a great step has been achieved in oil and gas exploration and development through many different ways of making full use of seismic data,studying well those features on gas bearing seismic response,relying on other related subjects of science.Meanwhile,it played a decisive role indeed the technique of describing the space distribution of the reservoir.Along with some practical experiences of explorating the natural gas in tight and heterogeneous reservoirs in West Sichuan,a series of these techniques are well introduced in details here from many aspects as follows: analyzing the basic geologic characteristics of reservoirs,building up the model of seismic response of sand body,forecasting the reservoir distribution, testing and checking the margins of reservoirs and describing the space distribution.