摘要
肃宁构造带油气资源丰富,开发潜力大,但是沙一下亚段储集层试油普遍为低产油层,导致勘探工作一直未获突破。通过研究可知,沙一下亚段主要为低孔低渗、特低孔特低渗储集层,是限制产量的主要因素。前期勘探普遍采用酸化改造措施,但效果不明显,通过XRD矿物含量分析对比可知,该区储集层方解石+白云石含量较低,而黏土+杂基含量较高,被酸化后残留在地层中,随着地层流体的流动发生运移,堵塞孔隙通道,反而使渗透率降低。该区储集层的矿物含量与适合压裂地区相近,因此适合进行压裂改造。实钻结果显示,新钻井初期试油产液量较低,证实物性较差;经压裂改造后获工业油流,压裂效果较好,说明研究结果准确,可以此为新思路推动该构造带的勘探进程。
The Suning structural belt is rich in oil and gas resources and has great potential for development.However,the well test in the lower sub-member of the first member of Shahejie formation is generally of low production,which leads to no breakthrough in exploration.The study shows that the lower sub-member of the first member of Shahejie formation is mainly composed of low porosity,low permeability and ultra-low porosity and ultra-low permeability reservoirs,they are the main factors restricting production rate.Acid stimulation measures are generally adopted in the early stage of exploration,but the effect is not obvious.According to the analysis of XRD mineral content,the content of calcite+dolomite in the reservoir of this area is low,while the content of clay+matrix is high.After acidification,clay and matrix remain in the formation,migrate with the flow of formation fluid,plug the pore channel and reduce the permeability.The mineral content of the reservoir in this area is similar to that in the suitable fracturing area,so it is suitable for fracturing.The actual drilling results show that the liquid-producing capacity is low in the initial oil production test of new drilling,which proves that the physical properties are poor.After fracturing,the industrial oil stream is obtained,and the fracturing effect is good,which shows that the research results are accurate and can be used as a new idea to promote the exploration process of this structural belt.
作者
张建山
李毅逵
赵璇
陈燕
张成武
姜勇
Zhang Jianshan;Li Yikui;Zhao Xuan;Chen Yan;Zhang Chengwu;Jiang Yong
出处
《录井工程》
2019年第3期27-31,184,185,共7页
Mud Logging Engineering
关键词
肃宁构造带
致密储集层
特殊岩性
储集层改造
矿物分析
Suning structural belt
tight reservoir
special lithology
reservoir stimulation
mineralogical analysis
