塔河油田碳酸盐岩储层三孔隙度测井模型的建立及其应用

Tri-porosity logging model of carbonate reservoir in Tahe Oilfield and its application

(1.中国石油化工股份有限公司西北油田分公司勘探开发研究院,新疆乌鲁木齐831100;2.长江大学,湖北荆州434023)

Exploration and Development Research Institute,Northwest Oilfield Branch Company,SINOPEC,Urumqi 831100,China

塔河油田碳酸盐岩缝洞型储层的非均质性强,溶蚀孔洞、裂缝、溶洞发育,定量计算储层基质和裂缝的孔隙度是评价缝洞型碳酸盐岩油气层的关键。由岩石骨架体积、基质孔隙体积、连通的缝洞体积和不连通的缝洞体积4个部分组成的测井解释模型可以模拟基质和连通缝洞的并联导电网络以及非连通缝洞和基质的串联导电网络。用中子和密度测井资料求取总孔隙度,采用声波测井资料计算基质孔隙度,结合深、浅双侧向电阻率计算出连通缝洞孔隙体积和非连通缝洞孔隙体积。计算出的3种孔隙成分适用于各种类型储层组合,并可定性判断储层的有效性。根据该方法判断出研究区的有利储层类型为基质孔和连通缝洞型以及孔-洞-缝组合型。

The fracture-cave carbonate reservoir in Tahe Oilfield has strong heterogeneity,fractures and caves are developed,so quantitatively computing the porosity of matrix and fracture is the key for evaluating the fracture-cave carbonate reservoirs.The log interpretation model,which was composed by rock matrix bulk,matrix pore bulk,connected fracture-cave bulk and unconnected fracture-cave bulk,can simulate the parallel conduction network of matrix and connected fracture-cave as well as series conduction network of unconnected fracture-cave and matrix.We utilize the neutron and density log data to calculate the gross porosity,acoustic data to calculate matrix porosity,combined with LLD and LLS resistivity to calculate the pore bulk of connected fracturecave and unconnected fracture-cave.The calculated three pore components are applicable for all kinds of reservoir combinations,and can be used for judge the effectiveness of reservoir.The favorable reservoir by using this method is matrix pore and connected fracturecave as well as pore-cave-fracture combination.