张迪,王显东,王有智,王志国,成德安,马威奇,陈绪强,祝斯淼,朱彦平,安测
ZHANG Di,WANG Xiandong,WANG Youzhi,WANG Zhiguo,CHENG De'an,MA Weiqi,CHEN Xuqiang,ZHU Simiao,ZHU Yanping,AN Ce

• 1:中国石油大庆油田有限责任公司勘探开发研究院
• 2:黑龙江省陆相页岩油重点实验室

摘要(Abstract)：

针对四川盆地东北部仪陇-平昌地区须家河组致密砂岩储层岩石类型复杂，储层微观孔隙结构特征不清的问题，优选须家河组52块致密砂岩储层样品，利用场发射扫描电镜、低温氮气吸附、高压压汞和核磁共振等实验手段，揭示致密砂岩储集层微观孔隙结构及其对储层物性的影响。结果表明：须家河组发育原生粒间孔、残余粒间孔、粒间溶孔、粒内溶孔、杂基孔、黏土矿物晶间孔和微裂缝7种孔隙类型，孔隙形态主要为平行板状孔；孔喉结构分为弱平台型、缓直线型、陡直线型和上凸形4种类型，陡直线型对应的孔喉结构最优；须家河组孔径分布范围较大，微米、纳米级共存，以纳米级为主，主要发育中孔和大孔；微观孔隙结构对储层物性影响大，孔隙度和渗透率均受微观孔隙结构影响，孔喉半径与渗透率相关性明显，因此渗透率受影响更大；须家河组自下而上微观孔隙结构愈加复杂，物性逐渐变差；须家河组二段孔径最大，喉道短，储层物性最好，须家河组四段孔径相对较小，喉道窄，物性次之，须家河组六段孔径小，喉道狭窄，物性最差。研究成果可为川东北地区下一步致密气勘探提供依据。
In view of complex rock types and unclear micro-pore structure characteristics of tight sandstone reservoirs of Xujiahe Formation in Yilong-Pingchang area in northeast Sichuan Basin, 52 tight sandstone reservoir samples are optimized, and micro-pore structure of tight sandstone reservoirs and its influence on reservoir properties are revealed via experimental methods of FESEM, low-temperature nitrogen adsorption, high-pressure mercury injection and NMR. The results show 7 types of pores developed in Xujiahe Formation, including primary intergranular pores, residual intergranular pores, intergranular dissolved pores, intragranular dissolved pores, heterobasic pores, clay mineral intercrystaline pores and micro-fractures. Pore geometry is mainly parallel plate pores. Pore throat structure is divided into 4 types including weak platform, slow straight line, steep straight line and upward convex, with steep straight line corresponding to optimal pore throat structure. Xujiahe Formation has large range of pore size distribution, with coexistence of micron-scale and nanoscale, dominated by nanoscale pores, and mainly medium and large pores developed. Micro-pore structure has much influence on reservoir properties, and both porosity and permeability are affected by micro-pore structure. There is significant correlation between pore throat radius and permeability, so permeability is more affected. Micro-pore structure of Xujiahe Formation is increasingly complex from bottom to top, leading to gradual deterioration of properties. Xu 2 Member has maximum pore size, short pore throat and optimal reservoir properties. Xu 4 Member has relatively small pore size, narrow pore throat and secondly good properties. Xu 6 Member has small pore size, narrow throat and the worst properties. The research provides basis for further tight gas exploration in northeast Sichuan.

关键词(KeyWords)： 微观孔隙结构;非均质性;致密砂岩储层;须家河组;川东北;仪陇-平昌地区
micro-pore structure;heterogeneity;tight sandstone reservoir;Xujiahe Formation;northeast Sichuan;Yilong-Pingchang area

Abstract:

Keywords:

基金项目(Foundation): 中国石油天然气股份有限公司科学研究与技术开发项目“四川盆地大庆探区侏罗系陆相页岩油富集机理与关键评价技术研究”（2022DJ1809）

作者(Author): 张迪,王显东,王有智,王志国,成德安,马威奇,陈绪强,祝斯淼,朱彦平,安测
ZHANG Di,WANG Xiandong,WANG Youzhi,WANG Zhiguo,CHENG De'an,MA Weiqi,CHEN Xuqiang,ZHU Simiao,ZHU Yanping,AN Ce

DOI: 10.19597/J.ISSN.1000-3754.202309045

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