中江气田沙溪庙组河道砂岩气藏低阻气层成因  

Genesis of low-resistance gas reservoirs in Shaximiao Formation channel sandstone gas reservoirs of Zhongjiang Gas Field,Sichuan Basin,China

作　　者：衡勇 王勇飞[2] 刘成川[2] 王洪辉 李秋政[4] HENG Yong;WANG Yongfei;LIU Chengchuan;WANG Honghui;LI Qiuzheng(Post-doctoral Scientific Research Station, Southwest Oil & Gas Company, SINOPEC, Chengdu 610041, China;Research Institute of Exploration and Development, Southwest Oil & Gas Company, SINOPEC, Chengdu 610041, China;Sichuan University of Science & Engineering, Zigong 643000, China;Research Institute of Exploration and Development, Jiangsu Oilfield Company, SINOPEC, Yangzhou 225009, China)

机构地区：[1]中国石化西南油气分公司博士后工作站,成都610041 [2]中国石化西南油气分公司勘探开发研究院,成都610041 [3]四川轻化工大学,四川自贡643000 [4]中国石化江苏油田分公司勘探开发研究院,江苏扬州225009

出　　处：《成都理工大学学报（自然科学版）》2020年第5期582-589,共8页Journal of Chengdu University of Technology: Science & Technology Edition

基　　金：国家科技重大专项(2016ZX05048)。

摘　　要：研究四川盆地中江气田侏罗系沙溪庙组河道砂岩中低阻气层形成的主控因素,指导低阻气层的测井识别。以岩心分析、地层水、测井、试气和生产资料为基础,从储层导电性和导电网络的影响因素入手展开分析。研究表明:低阻气层具有黏土矿物含量低、微细孔喉发育、微裂缝不发育、生产中后期水气比逐渐增加且地层水矿化度高的特征。天然气充注程度差和微细孔喉发育导致的高束缚水饱和度、高地层水矿化度是低阻气层形成的主要原因;薄膜状分布的绿泥石等黏土矿物的附加导电性是气层低阻的重要原因;微裂缝引起的泥浆侵入能够导致电阻率降低,但微裂缝发育的储层天然气充注程度较高,含气性好,电阻率较高,泥浆侵入引起的电阻率降低幅度不足以形成低阻气层。In order to clarify the main control factors and guide logging identification in the Jurassic Shaximiao Formation channel sandstones in Zhongjiang Gas Field,Sichuan Basin,the influence factors of reservoir conductivity and conductive network are analyzed based on the data of drilling cores,formation water,logging and production.The results show that the low resistance gas layers of Shaximiao Formation channel sandstones are characteristic of low clay mineral content,well developed micro-pore throat,poorly developed micro-fractures,gradually increase of water-gas ratio and high formation water salinity in the middle and late stages of production.It is considered that high irreducible water saturation due to poor gas filling degree,development of fine pore throat and high formation water salinity are the main factors for the formation of low gas resistance layers.The additional conductivity of clayey minerals,such as chlorite distributed in thin film,is also an important reason for the formation of low gas resistance layers.Mud invasion caused by micro-fractures can lead to a reduction in resistivity,but the reservoir developed with micro-fractures has a higher degree of natural gas filling,good gas bearing and high resistivity,so,the reduction in resistivity caused by mud invasion is not enough to form a low-resistivity layer.

关 键 词：中江气田 沙溪庙组 低阻气层 高束缚水饱和度 高地层水矿化度 

分 类 号：TE122.31[石油与天然气工程—油气勘探]