喇萨杏油田各类油层的储量潜力

RESERVES POTENTIALS OF THE DIFFERENT OIL RESERVOIRS IN LASAXING OILFIELDS

喇萨杏油田经过四十多年的开发调整，各类油层动用状况较为复杂。为了搞清各类油层潜力，从油藏工程原理出发，建立了水驱特征曲线和相对渗透率曲线结合计算分类井网动态储量方法，解决了静态法无法测算分类井地质储量问题。通过动静结合，形成了分层储量、剩余储量计算方法。计算结果表明喇萨杏基础井和一次加密井地质储量占总储量的81．34％，从而为分类井的分析和调整奠定了基础；喇萨杏油田水驱剩余地质储量主要分布在厚油层中，有效厚度大于1m的油层占68．8％，进而实现了储量认识的细化和量化，为油田的决策和规划提供了可靠依据；同时应用取心井资料，分析了各类油层的动用状况、矛盾和潜力，明确了油田特高含水期调整挖潜方向。

Through more than forty years development adjustment for Lasaxing Oilfields, the developed conditions of each kind of oil layers are rather complicated. In order to make sure of the potentials of these oil layers, starting from the fundamentals of oil reservoir engineering, the calculating method of performance reserves for all sorts of well patterns is established by means of the integration of both water-drive characteristics curves and relative perme- ability and furthermore the unpredicted and uncalculated OOIP problems by static method of the above wells can al- so be solved. With the help of the combined dynamic and static methods, the calculating methods of both separated layer reserves and remained reserves are established. The calculation results show that the OOIP of both basic and primary well patterns occupies 81.34% of the total in Lasaxing Oilfields, thus the analyses and adjustments for the divided wells can be done. The water-drive remained OOIPs of Lasaxing Oilfields are mainly distributed in the thick oil layers, the effective thickness of 68.8% of them is more than lm So the considerations of these reserves can be detailed and quantified, the above results finally provide a reliable evidence for oilfield decision making and programming. At the same time, with the help of the sampled core data, the development conditions, contradictions and potentials of each kind of oil layer are analyzed, the adjustment and potential-tapping orientations of the oilfields in the period of super-high water cut are made clear in the end.