塔河油田奥陶系一间房组与鹰山组断溶体发育模式解剖

Developmental mode analysis of the fault-karst reservoir in Yijianfang Formation and Yingshan Formation of Ordovician in Tahe Oilfield

吴丰,代槿,姚聪,习研平,梁晓宇,王炯,史彪,梁芸

西南石油大学地球科学与技术学院，四川 成都 610500 中国石化西北油田分公司采油二厂，新疆 乌鲁木齐 830011 中国石油青海油田分公司勘探开发研究院，甘肃 敦煌 736202 重庆科技学院石油与天然气工程学院，重庆 401331

School of Geosciences and Technology, Southwest Petroleum University, Chengdu 610500, China No.2 Oil Production Plant, Northwest Oilfield Company, SINOPEC, Urumchi 830011, China Research Institute of Exploration and Development, Qinghai Oilfield Company, PetroChina, Dunhuang 736202, China College of Oil and Gas Engineering, Chongqing University of Science and Technology, Chongqing 401331, China

受地震资料分辨率低的影响，塔河油田奥陶系一间房组与鹰山组断溶体油藏难以精细刻画。结合常规测井及电成像资料，开展了储层分类识别、断溶体发育影响因素剖析、断溶体油藏发育形态构建以及裂缝带、破碎带、溶蚀带分布研究。研究表明：断溶体油藏主要储集空间来自构造运动和溶蚀改造形成的溶孔、溶洞及裂缝；断溶体储层可划分为溶洞类、裂缝￣溶孔类、裂缝类3种类型；断层构造样式、与断层的距离决定断溶体的发育程度；断溶体主要发育有V字形态、倒V字形态、复合形态、条带形态；断溶体裂缝带的发育范围较宽（0.75~3.00 km），破碎带的发育范围其次（0.50~1.40 km），溶蚀带的发育范围较小（0~0.65 km）。

Affected by the low resolution of seismic data, the fault-karst reservoirs of the Ordovician Yijianfang Formation and Yingshan Formation in Tahe Oilfield are difficult to describe in detail. Combined with conventional logging and electrical imaging data, researches on reservoir classification and identification, analysis of influencing factors for fault-karst reservoir development, construction of fault-karst reservoir development patterns, and distribution of fracture zones, broken zones and dissolution zones have been carried out. Research shows that the main storage space of fault-karst reservoirs comes from dissolved pores, caves and fractures formed by tectonic movement and dissolution reformation. Fault-karst reservoirs can be divided into three types: karst caves, fractures-dissolved pores, and fractures. The fault style and distance from the fault determine the degree of development of the fault-karst reservoirs. The main development types of the fault-karst reservoirs are V shape, inverted V shape, composite shape, and striped shape. The development range of fracture zone in fault-karst reservoirs is relatively wide (0.75￣3.00 km), followed by the broken zone (0.50￣1.40 km), and the development range of dissolution zone is smaller (0￣0.65 km).

10.6056/dkyqt202201006