塔河油田古岩溶储集体三维建模

3D modeling of paleokarst reservoir in Tahe Oilfield

关键词:  古告溶储集体  岩溶带  岩溶地貌  三维建模  塔河油田

Key words:  paleokar?L reservoir  karst zone  palaeogeomorphology  3D modeling  Tahe Oilfield

摘要:

通过对rV岩溶储S建模方法适用忭的分析，从加强卉耑溶储集体发育模式在注模中的约束作用的角度出发， 探索一套”乖向划带、平面分K、断裂优先”的古岩溶储集体三维展布建模方法,将此方法位用于塔河油U丨4区奥陶 系油藏7维违模,并说明该方法的基本少骤,包括单井储集体识別与垂向划带，岩溶々地貌恢复与平面分区,地麄约 束数据的选用，建模算法与地质统计分析。研究表明:塔河油田4臥奥啕系垂向上n〖以划分为表展沿溶带、垂肓渗流 溶蚀带、柃流溶蚀带及潜流溶蚀带,平面上可分为岩溶高地、岩溶斜坡、岩溶洼地3类岩溶古地貌;古畀溶储集体发育 与地尜相干体具有较好的概申相关关系；基于垂向划带、平面分IX，断裂优先丨’方法建立的储集体三维模型与油田 牛产实践相符。

Abstract:

According to the applicability analysis of paleokarst reservoir modeling melhod, a meth(Kl of vertical division of karst zones, planar partition of palaeogeomorphology, fracture as priority wa^ formed, considering the restriction of the development pattern of paleokarst reservoir in the ni(Nleliiig. The primary steps of the method were demonstrated via ihe case of 3D modeling of Ordovician reservoir in TK4 block of Tahe Oilfield, which were reservoir identification in single well and vertical division of kai^t zone restoration and planar partitirwi of palaeogeonior|)hology, optimization of seismic data as constraint, analysis of modeling algorithm and geologic statistics. The results show that in the vertical direction, the Ordovician reservoir in TK4 block of Tahe Oilfield is divided into superficial karst zone，vertical seepage dissolution zone, runoff dissolution zone and subsurface flow dissolution zone； while in the planar direclion, 3 types of palaeogeomorphology units were distinguished， which were karst highland, karst slope and karst depression. The paleokarst reservoir has a good probability correlation with seismic coherence, and the 3D model built through the new method is well consistent with the oilHeld pnxluction.