摘要
B储层是伏尔加盆地库曼油田的主力产油层系,其地质储量占总地质储量的48.5%。利用钻井、测井、岩心资料,对该储层的沉积特征与非均质性进行了研究。结果表明,B储层属潮汐三角洲沉积,主力油层(C1-Ⅴ、C1-Ⅵ)以沙脊为主,非主力油层(C1-Ⅳ、C1-Ⅲ、C1-Ⅱ)以潮道、泥坪、沙坪为主。储层渗透率变异系数为0.42～1.62,突进系数为1.87～6.69,渗透率级差较大,层内、层间非均质性强,平面上非均质性相对较弱。综合评价认为,B储层C1-Ⅴ、C1-Ⅵ小层储层平面分布稳定,连通性较好,为有利开发层段;C1-Ⅳ、C1-Ⅲ、C1-Ⅱ小层非均质性较严重,含油面积小,油层厚度小,为差开发层段。
Reservoir B is the major oil production zone of Kuman Oilfield in Volga Basin, of which the oil in place accounts for 48.5% of the total. Research on the sedimentary features and heterogeneity of the reservoir is conducted, using the drilling, logging, and core data. Results show that the reservoir is tide delta and tide-delta sedimentary facies. The major oil layer (C1-Ⅴ and C1-Ⅵ) is dominated by dune ridges, while the non-major one is dominated by tidal channels, mudflat facies, and sandflat facies. The reservoir permeability variation coefficients range from 0.42 to 1.62, and the mutation coefficients are between 1.87 and 6.69. The permeability ratio is higher. The interlayer heterogeneity and the inner heterogeneity are strong, while the plane heterogeneity is weaker. Comprehensive evaluation shows that the C1-Ⅴ and C1-Ⅵ layers feature in stable plane distribution and good connectivity, and they are favorable for development. The C1-Ⅳ, C1-Ⅲ, and C1-Ⅱ layers feature in severe heterogeneity, small petroliferous area, and thin oil layers, and they are unfavorable for development.
出处
《中国石油勘探》
CAS
2008年第5期64-70,共7页
China Petroleum Exploration
关键词
伏尔加盆地
库曼油田
B储层
沉积特征
非均质性
Volga Basin
Kuman Oilfield
B reservoir
sedimentary feature
heterogeneity
