厚层河道砂体储层非均质性研究——以葡萄花油层组PI1—PI4小层为例

ANISOTROPY RESEACH ON THE THICK RIVER CHANNEL SAND RESERVOIR-A CASE OF LAYER PI1-PI4 IN PUTAOHUA OIL SET

储层非均质性对油气田的勘探和开发效果影响很大。结合测井资料二次解释的孔隙度(Φ)、泥质含量(Vsh)、粒度中值(Md)、束缚水饱和度(Swi)等资料,借助BP网络对渗透率进行预测。对萨尔图油田中部葡萄花油层组的非均质性进行了定量半定量的研究,认为萨尔图油田中部葡萄花油层组PⅠ2小层层内非均质性最严重,与沉积微相密切相关。单砂层垂向上渗透率的变化以正韵律和复合式韵律为主,局部发育反韵律模式。葡萄花油层组PⅠ1—PⅠ4小层层内非均质性强弱依次为PⅠ2a,PⅠ3,PⅠ2b,PⅠ1,PⅠ4;层间非均质性在PⅠ3和PⅠ4间表现得最强,其他相对要弱;各小层平面非均质性相差无几,整体表现为较强的非均质性。

The reservoir anisotropy takes a serious effect on the oil-gas field exploitation. By means of BP neural net permeability prediction and combining the secondly interpreted logged porosity（Ф） shale content（Vsh ）, granularity mean（Md）, irreducible water saturation（ Swi ）and so on the anisotropy at the Putaohua oil set in the middle of Sa＇ertu oil field is researched quantitatively and semi-quantitatively with a conclusion drawn that serious anisotropy occurs within P Ⅰ 2 layer. The anisotropy is closely related to the micro-sedimentary facies. The permeability is varied upward with dominant positive gradus and compound gradus pattern, and locally counter-gradus pattern. Anisotropy from strong to weak within layer P Ⅰ1-P Ⅰ4 is in turn P Ⅰ 2a,P Ⅰ3,P Ⅰ2b,P Ⅰ1,P Ⅰ 4. Very strong interspace anisotropy occurs at PⅠand PⅠand it is relatively weak in other layers. The plane heterogeneity of each layer is basically the same and on the whole it is strong.