大老爷府油田低阻油气藏储层及流体分布特征

Low Resistivity Reservoir and Flow Distribution Characteristics of DALAOYEFU Oil and Gas Field

对吉林油田分公司低阻、低渗、高饱和油藏的储层油气水分布特征 ,进行了深入研究。本区构造平缓 ,属保康水系所形成的三角洲前缘相和前三角洲相。砂体类型以三角洲前缘席状砂体和远砂坝砂体为主 ,砂岩以粉砂岩、泥质粉砂岩为主 ,泥质含量较高。砂体横向上连通性好 ,纵向上砂层较多 ,属层状构造油气藏。该区青一段储层层内非均质性较强 ,属低—特低渗孔隙性储层 ,而且具有亲水性。以上诸特点使得各储层内均表现油气水混相存在特征 ,油气水平面展布特征表现了受构造控制的明显因素 ,高部位高产气 ,低含水 ,产油中等 ;低部位高含水 ,低产气 ,产油低 ;腰部位产油高。

A deep study was done about gas, oil and water distribution characteristics in the Dalaoyefu oilfield, belonging to branch company of Jilin oilfield. The reservoirs in the oilfield are of low resistivity, low permeability and high saturation, and gentle structure, and delta front or predelta facies formed by Baokang water family. The types of sand bodies are mainly sand sheet and sand bar of delta front. The lithology of sandstone is mainly siltstone, and argillaceous siltstone, with high shale content. The sand bodies connect well in horizontal. The intervals include multiple sandstone layers, which was identified as layered structural reservoir. In the oilfield site, heavy in-layer heterogeneity was found in Qin1 reservoir, considered as porous reservoir with low or ultra-low permeability, and hydrophilicity, which makes gas, oil and water mixed to distribute in each reservoir. The distribution of gas, oil and water shows that structure is an obvious factor to control the reservoir. High gas rate, low water rate and medium oil rate occur in high zone in elevation, high water cut, low gas and oil rate in low zone, and high oil rate in waist part. In addition, it is also found out that the productivity is closely related to sedimentary micro-facies and reservoir property parameters.