东濮凹陷桥口低渗气藏储层敏感性及对策研究

Reservoir sensitivity in low-permeability Qiaokou gasfield,the Dongpu Sag and the solutions to it

东濮凹陷桥口低渗气藏储量大,地质条件复杂。借助扫描电镜、X-衍射、敏感性试验等多方面的资料,综合分析了储层受损害的因素,明确提出该区以应力敏感性、速敏、水敏、盐敏、碱敏、酸敏为主的观点。对储层的各种敏感性进行了研究和评价,从而寻求维持储层原始渗透率或改善储层渗滤性质的方法和途径,并相应提出了保护低渗油藏、改善油层开发效果的具体措施。

Low-permeability reservoirs in Qiaokou gas field, Dongpu sag,features in large reserves and complicated geological conditions. By dint of SEM, X-ray diffraction, sensitivity testing, and other means, the author sums up factors of reservoir damages, specifies that the reservoirs in the study area mainly suffer from stress sensitivity, velocity sensitivity, water sensitivity, salt sensitivity, alkali sensitivity and acid sensitivity. Based on research and evaluation of all kinds of sensitivities, this paper presents approaches and solutions for maintaining the original reservoir permeability or enhancing reservoir permeability, and proposes practical measures for protecting low-permeability reservoirs and improving production performance.