文昌Ⅹ油田物性主控因素定量分析及有利区预测

Quantitative Analysis of the Main Controlling Factors of Physical Properties and Prediction of Favorable Areas in Wenchang Ⅹ Oilfield

文昌Ⅹ油田目的层珠海组是低渗背景下发育“甜点”的典型储层,有利区的预测问题亟待解决。为此,针对珠海组分析沉积作用和成岩作用对其物性分布规律的影响。应用成岩数值模拟方法,综合考虑成岩与沉积两大物性影响因素,建立孔隙度预测模型。研究表明:中粗砂岩物性较好,水下分流河道根部物性最好;压实作用和胶结作用降低了储层物性,溶蚀作用改善了储集空间,且压实作用是低渗储层形成的最主要因素。珠海组二段和珠海组三段的孔隙度分布规律存在差异,但总体上有利区分布于靠近南大断裂的区域,埋深相对较浅、成岩强度较弱、离物源较近。

The Zhuhai Formation,the target layer of Wenchang Ⅹ Oilfield,is a typical reservoir with developed"sweet spots"under a low permeability background,and the prediction of favorable areas urgently needs to be solved.Therefore,the influence of sedimentation and diagenesis on the physical property distribution of Zhuhai Formation is analyzed.On this basis,a porosity prediction model is established by applying the numerical simulation method of diagenesis and comprehensively considering the two major physical factors of diagenesis and sedimentation.The results show that the medium-coarse sandstone has good physical properties and the physical properties of the roots of underwater distributary channels are also good.The compaction and cementation reduce the physical properties of the reservoir,and the dissolution improves the reservoir space,among which compaction is the most important factor for the formation of the low permeability reservoir.The porosity distribution of Zhuhai II formation is different from that of Zhuhai III formation,but on the whole,the favorable areas are near the great south fault,the relatively shallow buried depth,the weak diagenetic strength and the near provenance.