塔河油田奥陶系碳酸盐岩油藏类型探讨

Reservoir types of Ordovician carbonate rocks in Tahe Oilfield

吴涛 李宗宇 李建荣

西北油田分公司勘探开发研究院，新疆 乌鲁木齐 830013 西北油田分公司开发处，新疆 乌鲁木齐 830013 西南分公司勘探开发研究院，四川 自贡 643000

塔河油田奥陶系油藏是非均质性极强的碳酸盐岩油藏，普遍的观点认为塔河油田奥陶系油藏为若干个相互独立的缝洞单元组成的独立油藏集合体，鹰山组下段或蓬莱坝组发育的大底水，给油藏开发研究和后期综合治理带来越来越多的矛盾和困惑。文中从大量的实钻资料、生产动态资料出发，通过古岩溶机理、成藏机理等方面研究，认为塔河油田奥陶系碳酸盐岩油藏是复杂缝洞体交错组合在一起的油水界面凹凸不平的似层状边水油藏，水体主要分布在南部5 648 ~ 6 310 m深度处。研究结果对该油藏开发技术对策的调整和提高采收率研究有一定的指导意义。

Ordovician carbonate reservoirs have a extremely strong anisotropism in Tahe Oilfield. The general viewpoint is that the
Ordovician reservoirs are the aggregation of many independent reservoirs composed by the vug-fractured systems. The abundant
bottom water exists in the lower section of Yingshan Formation or Penglaiba Formation, which leads more contradictions and
perplexity in reservoir development research. Based on a great many of drilling and production data, the article thinks that the
carbonate reservoirs are the quasi-laminate reservoirs of edge water invasion composed with complicated vug-fractured systems. The
water bodies mainly exist in the depth of 5 648-6 310 m in the southern area. The research results have the guide sense for the
adjustment of development countermeasure and EOR research.