克拉玛依油田六、七、九区石炭系内幕有利火山岩储层岩性分布预测

Prediction of the lithology distribution of favorable volcanic reservoirs in the inside Carboniferous system in Block 6, 7 and 9 of Karamay Oilfield

近年新钻井中,多井在准噶尔盆地西北缘克拉玛依油田的六、七、九区石炭系顶面之下较深的内幕火山岩中获得工业油流,其有利储层岩性分布预测是难点。通过分析研究区不同类型火山岩测井参数的敏感性和响应特征,用统计学方法研究常规测井参数与不同类型火山岩之间的对应关系,建立了电阻率、自然伽马与岩性关系图版。火山岩岩性识别图版中,凝灰岩与玄武岩、安山岩以qAPI=40 API分界,具有区分度,但玄武岩、安山岩不易区分。火山岩分布以凝灰岩为主,其中夹有安山岩和玄武岩,安山岩和玄武岩主要呈北东向沿克-乌断裂带展布,研究区总体位于火山机构的远端。内幕火山岩中各类火山岩均可作为油气储层,从含油气性及产量的角度,凝灰岩要优于安山岩和玄武岩。

From the recent drilling results, the commercial oil was found in the inside volcanic rocks beneath Carboniferous top interface in Block 6, 7 and 9 of Karamay Oilfield in the northwestern margin of Junggar Basin, the prediction of the lithology distribution for the favorable reservoirs is the problem. Base on the sensitivity and response characteristic analyses of different types of the volcanic rocks to the logging parameters in the study area, and moreover with the help of the statistical method, the correspondent relationships between the conventional logging parameters and different types of the volcanic rocks was studied, and furthermore the relationship chart boards between the resistivity, natural gamma and lithology were established. In the lithology-identification chart board of the volcanic rocks, the tuff and basalt-andesite are demarcated by GR=40 API, but the basalt and andesite is difficult to be distinguished. The volcanic rocks are mainly composed of the tuff interbedded with small amount of the andesite and basalt. The andesite and basalt are mainly distributed along Ke-Wu Fault Belt with NE strike. The study area is in general located at the far end of the volcanic mechanism. All kinds of the volcanic rocks in the inside volcanic rocks can be regarded as oil and gas reservoirs. From the aspects of the oil-gas bearing property and productions, the tuff is superior to the andesite and basalt.