致密砂岩储层可动流体赋存特征及主控因素分析——以鄂尔多斯盆地华庆地区长63储层为例  

Movable Fluid Traits and Its Main Controlling Factors in Tight Sandstone Reservoirs——Taking Chang-63 of Huaqing Area in Ordos Basin, China as An Instance

作　　者：王桐 魏虎 孙卫[1] 韩进 白云云 高庚庚 Wang Tong;Wei Hu;Sun Wei;Han Jin;Bai Yunyun;Gao Genggeng(State Key Laboratory of Continental Dynamics/Department of Geology, Northwest University, Xi'an, Shaanxi 710069, China;Shaanxi Yanchang Petroleum (Group) Co., Ltd., Xi'an, Shaanxi 710075, China;College of Chemistry and Chemical Engineering, Yulin College, Yulin, Shaanxi 719000, China;Xiasiwan Bay Oil Production Plant, Shaanxi Yanchang Petroleum (Group) Co., Ltd., Yan'an, Shaanxi 716000, China)

机构地区：[1]大陆动力学国家重点实验室/西北大学地质学系,陕西西安710069 [2]陕西延长石油(集团)有限责任公司研究院,陕西西安710075 [3]榆林学院化学与化工学院,陕西榆林719000 [4]陕西延长石油(集团)有限责任公司下寺湾采油厂,陕西延安716000

出　　处：《非常规油气》2020年第2期56-63,共8页Unconventional Oil & Gas

基　　金：国家科技重大专项“大型油气田及煤层气开发”(2011ZX05044);国家自然科学基金项目“致密砂岩油藏成岩-烃类充注时序对微纳米孔隙结构的约束机制及石油充注孔喉下限研究”(41702146);陕西省青年科技新星项目“陆相页岩微纳米孔喉结构非均质性及对页岩气赋存状态的控制机理”(2019KJXX-054)联合资助。

摘　　要：致密砂岩储层的微观孔喉结构特征复杂,流体的赋存特征和渗流特征差异性明显,是目前致密砂岩储层开发的关键问题所在。本文以鄂尔多斯盆地华庆地区长63致密砂岩储层为例,采用核磁共振、恒速压汞、高压压汞、扫描电镜、铸体薄片等多种微观实验方法相结合对比分析,对储层可动流体进行定量评价,并探讨影响储层可动流体变化差异性成因的主控因素。研究结果表明致密砂岩储层T2谱形态分布复杂,主要表现为双峰结构形态,且左右峰幅度高低不等,同时具有一定的多峰和单峰形态。微观孔喉结构特征的非均质性是导致可动流体赋存特征差异的主要控制因素,同时黏土矿物的成分、含量、分布形式以及充填孔喉程度也是影响可动流体赋存特征的重要因素。The microscopic pore-throat structure of tight sandstone reservoirs is complex,and the characteristics of fluid occurrence and seepage characteristics are obvious.They are the key problems in the development of tight sandstone reservoirs.Taking Chang-63 tight sandstone reservoir in Huaqing area,Ordos Basin as an example in this paper,a variety of microscopic experimental methods such as nuclear magnetic resonance,constant velocity mercury intrusion,high pressure mercury intrusion,scanning electron microscopy,and casting thin sections were used to compare and analyze the reservoir.Dynamic fluids were quantitatively evaluated and the main controlling factors affecting the differential causes of reservoir fluid changes were discussed.The results show that the T2 spectrum of tight sandstone reservoirs is complex,mainly characterized by bimodal structure,and the amplitudes of the left and right peaks are different,and there are certain multi-peak and single-peak forms.The heterogeneity of the microscopic pore-throat structure is the main controlling factor leading to the difference of the characteristics of the movable fluid.At the same time,the composition,content,distribution form of the clay mineral and the degree of filling the pore throat also affect the occurrence of the movable fluid.

关 键 词：华庆地区 核磁共振 微观孔喉结构 可动流体 主控因素 

分 类 号：TE122[石油与天然气工程—油气勘探]