鄂尔多斯盆地某区煤系致密砂岩气综合预测方法

Integrated Prediction of Coal Measures Tight Sandstone Gas in an Area of Ordos Basin

我国煤系致密砂岩气资源十分丰富,但整体勘探程度较低。研究提高煤系致密砂岩气的识别方法,对我国油气勘探开发的意义重大。鄂尔多斯盆地是我国陆上最重要的含油气盆地。通过研究鄂尔多斯盆地某区煤系致密气储存特点,利用不同岩性的测井响应特征与岩性识别结果,采用测井和地震等多方法联合分析了该区致密砂岩含气的控制因素,并依据致密砂岩含气“甜点”评价与优选的四条原则,预测了煤系致密砂岩气“富气甜点区”,圈定出研究区山_(1)段甜点区4个,山_(2)段甜点区3个。

Coal measures tight sandstone gas resources are abundant in China,but degree of exploration is lower as a whole.To probe into promotional identification method of the tight sandstone gas has great significance in hydrocarbon exploration and exploitation in China.The Ordos Basin is the most important land hydrocarbon containing basin in the country.By studying of coal measures tight sandstone gas preservation features in an area of the basin,through different lithologic logging responding features and lithologic identification results,using well logging and seismic prospecting etc multiple means,integratedly analyzed the control factors of tight sandstone gas-bearing in the area.According to the four principles of tight sandstone gas-bearing“dessert”assessment and optimization have predicted coal measures tight sandstone gas-rich“dessert”areas,and delineated study area Shanxi Formation member S_(1)4“dessert”areas,and member S_(2)3“dessert“areas.