摘要
低饱和度油藏中存在明显可动水,明确低饱和度油藏的孔隙分布及不同尺度孔隙中石油微观赋存状态是认识低饱和度油藏特征的关键。利用原油性质、荧光薄片、铸体薄片及试油试采资料等对准噶尔盆地玛西斜坡八道湾组一段低饱和度油藏的微观赋存状态进行研究。研究表明:1)玛西斜坡侏罗系八道湾组一段低饱和度油藏为轻质原油,原油组分主要有油质和胶质—沥青质两种类型,而三叠系百口泉组原油组分主要为油质组分,八道湾组一段原油组分具有“高含量胶质—沥青质、低含量油质”的特征。2)玛西斜坡八道湾组一段为低孔低渗储层,储层孔隙结构较差,主要发育原生粒间孔、次生粒内溶孔和微裂缝,其中原生粒间孔为大孔,次生粒内溶孔为小孔,原生粒间孔对于储集物性的贡献占主导地位。3)玛西斜坡八道湾组一段低饱和度油藏储层中原生粒间孔富含油质,发育微裂隙的粒内溶孔也富含油质,而次生粒内溶孔和晶间孔富含胶质和沥青质。4)八道湾组一段低饱和度油藏经历了早期充注、晚期调整的过程,早期充注在大孔中的油质组分由于分子链小而逸散,而大分子链的胶质和沥青质在小孔的粒内溶孔和晶间孔中富集,形成了高含量的胶质和沥青质。结论认为:高含量胶质和沥青质加剧了砂砾岩储层的非均质性,为八道湾组一段的油藏成藏调整提供了侧向封堵条件,被胶质和沥青质影响的小孔中存在共存水,随着油藏的开发,大孔中的轻质油和小孔中的共存水一起被开采出来,表现出油水同出的生产特征。
There is obvious movable water in low saturation reservoir.The key to recognize the characteristics of low saturation reservoir is to know the pore distribution of low saturation reservoir and the microscopic state of petroleum in the pores of different scales.The microscopic occurrence of oil in the first low saturation reservoir of Badaowan Formation on the Maxi Slope of the Junggar Basin has been studied by means of crude oil property determination,fluorescence thin section,cast thin section and production test data.The results show that:1)the low-saturation reservoir of the first member of Badaowan Formation in Maxi Slope is light crude oil,and the crude components of the first member of Badaowan Formation are mainly oil and resin-asphaltene,the oil components of Baikouquan Formation are mainly oil components,and the first member of Badaowan Formation has the characteristics of“high content of gum,asphaltene and low content of oil”.2)The first member of Badaowan Formation in Maxi Slope is a low porosity and low permeability reservoir with poor pore structure,mainly developing primary intergranular pores,secondary intragranular dissolved pores and micro-fractures,among which primary intergranular pores are macropores,the dissolved pores in secondary grains are small pores,and the primary intergranular pores play a dominant role in the reservoir physical properties.3)The primary intergranular pores are rich in oil,while the secondary intragranular dissolved pores and intergranular pores are rich in resin and asphaltene,the reservoirs with micro-fractures are also rich in oil.4)The low-saturation reservoir of the first member of Badaowan Formation experienced the process of early filling and late adjustment,the resin and asphaltene of macromolecular chain are enriched in the pores of pores and inter-crystalline pores,forming high content of resin and asphaltene.It is concluded that the high content of gum and asphaltene aggravates the heterogeneity of glutenite reservoir and provides lateral sealing conditions for the adjustment of reservoir formation in the first member of Badaowan Formation,with the development of the reservoir,the light oil in the big hole and the coexistent water in the small hole are produced together,thus forming the low saturation reservoir.
作者
王林生
赵晓东
刘文锋
谢宗瑞
吴新豫
王燕娥
郭达发
Wang Linsheng;Zhao Xiaodong;Liu Wenfeng;Xie Zongrui;Wu Xinyu;Wang Yan'e;Guo Dafa(Xinjiang Oilfield Company,CNPC,Karamay,Xinjiang 834000;School of Petroleum,China University of Petroleum(Beijing)at Karamay,Karamay,Xinjiang 834000;Exploration and Development Research Institute,Xinjiang Oilfield Company,CNPC,Karamay,Xinjiang 834000)
出处
《地质科学》
CAS
CSCD
北大核心
2023年第4期1325-1339,共15页
Chinese Journal of Geology(Scientia Geologica Sinica)
基金
新疆维吾尔自治区自然科学基金项目(编号:2021D01F39)
克拉玛依市创新环境建设计划(创新人才)项目(编号:20232023hjcxrc0049)资助。
关键词
准噶尔盆地
玛西斜坡
八道湾组一段
低饱和度油藏
荧光薄片
微观赋存状态
Junggar Basin
Maxi Slope
The first member of Badaowan Formation
Fluorescence thin section
Microscopic occurrence
Low-saturation oil reservoir
