| 时间: 2022-01-10 | 次数: |
徐延勇, 韩旭, 张兵, 等.鄂尔多斯盆地东缘临兴区块盒8段致密砂岩储层天然气低产原因剖析[J].河南理工大学学报（自然科学版）,2022,41(1):52-58.
XU Y Y, HAN X , ZHANG B,et al. Ｒeasons for low productivity of the dense sandstone gas reservoir in the 8th Member of the Shihezi Formation in the Linxing Block，eastern Erdos Basin [J].Journal of Henan Polytechnic University(Natural Science) ,2022,41(1):52-58.
鄂尔多斯盆地东缘临兴区块盒8段致密砂岩储层天然气低产原因剖析
徐延勇, 韩旭, 张兵, 陆小霞
中联煤层气有限责任公司，北京100011
摘要:为了查明致密砂岩储层天然气井低产原因并提出针对性开发措施，以鄂尔多斯盆地东缘临兴区块上古生界下石盒子组盒8段为研究对象，基于铸体薄片、压汞、物性、敏感性等分析测试，查明致密砂岩储层特征，确定适宜开发措施。结果表明：盒8段岩石类型以岩屑石英砂岩为主，塑性组分含量较高且以黏土矿物为主；储层表现出典型的低孔隙度、低渗透率、高排驱压力和中值压力、低退汞效率、强非均质性等特点。在上述地质和物性条件约束下，致密砂岩储层表现出中等偏强速敏、强水敏、中等偏弱应力敏感性，导致区块内天然气井低产。针对该储层特性，提出加强钻井过程储层保护、选取适宜压裂液配方和控制压裂返排时间、科学管理试气与试采是释放盒8段产能的有效工程措施。
关键词:鄂尔多斯盆地;石盒子组;致密砂岩储层;低产
doi:10.16186/j.cnki.1673-9787.2020050071
基金项目:国家科技重大专项（2016ZX05064）；国家自然科学基金资助项目（41672149）
收稿日期:2020/05/22
修回日期:2020/06/29
出版日期:2022/01/10
Ｒeasons for low productivity of the dense sandstone gas reservoir in the 8th Member of the Shihezi Formation in the Linxing Block，eastern Erdos Basin
XU Yanyong , HAN Xu , ZHANG Bing , LU Xiaoxia
China United Coalbed Methane Co. ，Ltd. ， Beijing 100011 ， China
Abstract: In order to uncover the reasons why dense sandstone gas reservoir sometimes has low productivity and to put out pertinent exploitation strategies，the 8th Member of the upper Paleozoic Lower Shihezi Formation in the Linxing Block，eastern Erdos Basin was studied herein． The characteristics of the focused low-productivity gas reservoir had been described on the basis of casting thin sections，mercury injection，physical properties， and sensitivity analyses． The results showed that the 8th Member of the Shihezi Formation was mainly composed of lithoclastic quartz sandstones，with high proportion of plastic components and clay minerals． The reservoir exhibited typical low porosity，low permeability，high displacement and median pressure，low mercury removal efficiency，and strong inhomogeneity features． These geological and physical conditions tended to make the dense sandstones become medium-strong velocity sensitivity，strong water sensitivity，and medium-weak stress sensitivity，ultimately bringing about low production of gas wells in this area． Effective engineering strategies to re lease the productive capacity of the 8th member of the Shihezi Formation were suggested to be strengthening the protection on the reservoir during drilling process，selecting suitable fracturing fluid formula，controlling fracturing flowback time，and scientifically managing gassing and production test.
Key words:Erdos Basin;Shihezi Formation;dense sandstone gas reservoir;low productivity
