塔里木盆地轮古东奥陶系碳酸盐岩储层特征与主控因素

Characteristics and main controlling factors of the Ordovician carbonate rock reservoirs in Lugudong area,the Tarim Basin

塔里木盆地轮古东地区奥陶系碳酸盐岩礁滩复合体油气藏是塔里木油田分公司近期重点勘探区带之一。油气藏的储集岩主要有亮晶颗粒灰岩、粉晶颗粒灰岩、泥晶颗粒灰岩、泥晶灰岩,其中亮晶颗粒灰岩的储集性能较好;储层的基质孔隙不发育,主要的孔隙空间为溶蚀孔洞和裂缝;储层分为洞穴型、孔洞型、裂缝型和裂缝-孔洞型,其发育程度主要受沉积相、溶蚀作用和破裂作用控制。形成了轮古东地区奥陶系碳酸盐岩礁滩复合体储层叠置连片、广泛发育的分布特征。

The Ordovician carbonate reef-bank complex reservoirs in the Lungudong area of the Tarim Basin are the important exploration targets in the recent development scheme of Tarim Oilfield Company. The reservoir rocks mainly include spaITy grainstone, fine-granular grainstone, micritic grainstone, and micrite, among which the sparry grainstone has much better poroperm characteristics. Matrix porosity of these reservoirs are low with dissolution vugs and fractures as the main pore space. The reservoirs can be divided into the following four types ： cavity, vug, fracture, and fracture-vugg, whose development was dominated by sedimentary facies, solution, and fracturing. The Ordovician carbonate reef-bank reservoirs in the Lungudong area are characterized by extensive, superimposed and continuous distribution.