摘要
红台地区低饱和度油气藏主要分布在中侏罗系西山窑组,储集层物性差,地层水矿化度偏高,水型变化大,油气水关系复杂,束缚水含量高,测井识别比较困难。综合运用钻测井、试油和测试分析化验等资料,通过沉积环境、构造特征、成岩作用等分析,从宏观和微观两方面对红台2、3号构造西山窑组低饱和度油气藏的成因机理进行了研究。结果表明:沉积水动力条件和油气的成藏期对该区油气藏饱和度高低具有控制作用;低饱和度油气藏的微观机理与常规油气藏也存在差异性,储集层孔隙类型以次生孔隙为主,微细孔喉发育,高岭石、绿泥石、伊利石等黏土矿物含量偏高及纵向上具有非均质夹层间互的特点,多因素共同作用造成了红台地区西山窑组油气藏饱和度偏低而束缚水饱和度偏高。
Low saturated reservoirs of Hongtai area mainly existed in middle Jurassic Xishanyao formation,with characteristics of poor reservoir physical property,high salinity of formation water,big water type change,complex oilgas-water relation,high bound water saturation and big difficulty in logging identification.Based on the drilling,logging,well testing and analysis test data,through comprehensive analysis of sedimentary environment,structure characteristics and lithology,the genetic mechanism study of low saturated reservoirs in Xishanyao formation of Hongtai 2 and 3 structures was carried out both from macro and micro aspects.The results indicated the deposition hydrodynamic conditions and the hydrocarbon accumulation period played a controlling role in reservoir saturation level.From micro aspect,there existed difference between the low saturated reservoirs and the conventional reservoirs,the pore type was mainly of secondary pores,with developed micro pore throats and high content of clay minerals such as kaolinite,chlorite and illite.Vertically,it was characterized by heterogeneity between each other.Affected by multiple factors,the saturation was lower while the irreducible water saturation was higher in Xishanyao formation of Hongtai area.
出处
《石油地质与工程》
CAS
2017年第4期17-21,共5页
Petroleum Geology and Engineering
基金
国家油气科技重大专项"岩性地层油气藏区带
圈闭有效性评价预测技术"(2016ZX05001003–006)
关键词
红台地区
西山窑组
低饱和度油气藏
成因机理
Hongtai area
Xishanyao formation
low saturated reservoirs
genetic mechanism
