塔里木盆地塔河油田奥陶系油气藏储集层特征

塔里木盆地塔河油田已经发现的储量中,88%储藏在奥陶系碳酸盐岩储集层中,其储集空间是相互不连接的与连接的网状溶岩内的孔隙.奥陶系储集层内不同位置的油、气、水特征明显,油田内没有统一的油/水界面,更增加了油气藏的复杂性.经过酸化压裂处理后,获得高产及商业油流的井可达总井数的75.9%.酸化压裂是塔河油田改善储集层内连通性、改造非生产井、提高产量的重要手段,也是其它具有类似储集层油田开发的基本方法.

Reservoir characterization of the Odovician oil and gas pools in the Tahe Oilfield,Tarim Basin, Northwest China

About 88.1% of the proven reserves in the Tahe Oilfield in the Tarim Basin of Northwest China are trapped in Ordovician carbonate reservoirs. These reservoirs are formed by unconnected and interconnected networks of karstic porosity forming a heterogeneous and complex reservoir system. Oil, water and gas characteristics vary significantly in different portions of the Ordovician reservoir. There is no uniform oil/water contact in the field, adding to its complexity. An acid fracture treatment is beneficial in 76% of the wells, stimulating nonproductive wells and enhancing production in other wells by fracturing into unconnected reservoirs and enhancing flow pathways with acid. Acid fracture treatments should be a standard procedure for developing this and similar oil fields.