摘要
页岩孔隙特征是影响页岩含气性的重要因素。综合运用氩离子抛光扫描电镜、高压压汞、液氮吸附等技术,对涪陵地区五峰组—龙马溪组龙一段上部气层孔隙特征进行研究,对比上下部页岩孔隙发育特征的差异性。研究发现,下部气层有机碳含量高,孔隙类型以有机质孔为主,孔体积基本大于0.02 m L/g,BET比表面积基本大于20 m2/g;上部气层有机碳含量低,孔隙类型主要为微裂隙、黏土矿物孔,孔体积主要分布在0.016~0.02 m L/g,比表面积主要为12~20 m2/g。结合单井含气量测试结果,发现有机碳含量与含气量相关性最好,比表面积和孔隙度次之。以此为基础,开展上部气层含气性评价,认为(8)小层为上部气层含气性最佳层段,(6)和(7)小层次之,(9)小层最差。
Shale porosity is an important factor affecting the gas-bearing capacity of shale.The pore characteristics of the upper gas layer from the Wufeng Formation to the first member of Longmaxi Formation were studied and compared with the lower gas layer by using argon plasma scanning electron microscopy(SEM),high pressure mercury intrusion and liquid nitrogen adsorption.Results show that the organic carbon content of the lower gas layer is high,the pores in the organic matter are dominant,the pore volume is mainly>0.02 mL/g,and the BET specific surface area is mainly>20 m 2/g.The organic carbon content of the upper gas layer is low,the pores are mainly micro-fissures and clay mineral pores,the pore volume is mainly distributed from 0.016-0.02 mL/g,and the specific surface area is mainly 12-20 m 2/g.Combined with a single well gas content test results,we found that organic carbon content has the best correlation with gas content,followed by specific surface area and porosity.An evaluation of the gas-bearing properties of the upper gas layer was carried out.Sub-layer⑧was considered as the best gas layer in the upper interval,while sub-layers⑥and⑦were the next best,and sub-layer⑨the worst.
作者
刘尧文
王进
张梦吟
蔡进
卢文涛
沈童
LIU Yaowen;WANG Jin;ZHANG Mengyin;CAI Jin;LU Wentao;SHEN Tong(SINOPEC Jianghan Oilfield Company,Qianjiang,Hubei 433124,China;Research Institute of Petroleum Exploration and Development,SINOPEC Jianghan Oilfield Company,Wuhan,Hubei 430223,China)
出处
《石油实验地质》
CAS
CSCD
北大核心
2018年第1期44-50,共7页
Petroleum Geology & Experiment
基金
国家科技重大专项(2016ZX05060)
中国石化科技项目(P17014-3)资助
关键词
孔隙特征
页岩
页岩气
五峰-龙马溪组
涪陵地区
四川盆地
pore characteristics
shale
shale gas
Wufeng-Longmaxi formations
Fuling area
Sichuan Basin
