稠油热采过程中粘土矿物变化特征研究——以金家油田沙一段为例  

Variation of Clay Minerals in the Process of Heavy Oil Thermal Recovery for the 1st Member of Shahejie Formation in Jinjia Oilfield, China

作　　者：路言秋 

机构地区：[1]胜利油田勘探开发研究院,山东东营257015

出　　处：《矿物学报》2016年第3期359-364,共6页Acta Mineralogica Sinica

基　　金：国家重大科技专项"大型油气田及煤层气开发"项目(编号:2011ZX05011-002)

摘　　要：金家油田沙一段稠油油藏储层粘土含量高且具膨胀性,导致储层强水敏性,制约油藏热采开发,因此需要明确高温条件下粘土矿物热变特征,为开发提供指导。经差热和热重、高压釜高温实验后样品晶间距、溶质分析、X射线衍射、扫描电镜和含油薄片等分析表明：在100~200℃的温度条件下,蒙脱石脱表层吸附水,晶间距仍较大,膨胀性较强,此种情况,容易堵塞孔喉,导致物性变差,阻碍原油溢出使得剩余油饱和度较高;200~300℃温度条件下,蒙脱石脱去B位层间水,晶间距变小,膨胀性减弱,再加上高温对矿物溶蚀,改善孔喉连通性,使储层物性变好,原油容易溢出,剩余油饱和度降低。The high clay content and the expansion of clay mineral in heavy oil reservoir for the 1st Member Shahejie Formation in Jinjia Oilfield cause strong water sensitivity, which restrict the thermal recovery, so, the study on heat changing of clay mineral is crucial. Differential thermal and thermogravimetric analysis and experiments including the crystal axial range test, analysis of aqueous solutes, X-Ray Diffraction, SEM and oil-bearing thin section after the tests in high temperature in autoclave show that axial range and expansion of montmorillonite are huge during surface water removal from montmorillonite at 100-150 ℃, which is easy to plug the pore throat resulting in poor physical property, indicating the crude oil spillage and making high saturation of the residual oil; at 200-300 ℃, axial range and expansion of montmorillonite become small with B interlayer water off, and coupled with minerals corroded by high temperature, and pore throat connectivity is improved. Physical property of the reservoir becomes good, and the remaining oil saturation decreases because the crude oil overflow easily.

关 键 词：强水敏 粘土矿物热变 稠油油藏 金家油田 沙一段 

分 类 号：P579[天文地球—矿物学]