文明寨油田构造精细解释与储层预测——以明一块沙二下油藏为例

Fine interpretation and reservoir prediction in complex faultedblocks: case study of the lower Es2 Member in Wenmingzhai Oilfield

中国石油化工股份有限公司中原油田分公司物探研究院,河南濮阳457001

Wang Gonghuai,Geophysical Research Institute,Zhongyuan Oilfield Company,SINOPEC,Puyang 457001,China

文明寨油田是东濮凹陷被多向断层切割的极复杂断块油田,含油层系多。明一块是文明寨油田重要开发区块之一,块内次级断层发育,构造极其复杂,目的层沙二下亚段砂岩储层单层厚度薄、横向变化大。明一块内部的小断层识别、低幅度构造解释、薄砂体预测是该区研究的难点。利用新采集的高精度三维地震资料,采用多方向切线与时间切片结合、相干体切片与地震剖面约束、开发“动、静态”资料约束等方法,进行小断层、井间隐伏断层精细解释，通过地震属性敏感性分析、多种地震属性综合应用,定量分析刻画了砂体。通过以上研究在该区有效解释了断距10m以上井间断层,描述了厚度5m以上单砂体的井间变化特征。将研究成果应用于开发方案部署,解决了明一块部分井区注采矛盾,取得了较好效果。

Since there are multitypes of multidirection faults in Dongpu depression,Wenmingzhai Oilfield is an extracomplicated faultedblock oilfield with multi oilbearing layers.As one of the important developing blocks,Ming1 block has multi sublevel faults and extremely complex structures.The target lower Es2 is characterized by thin single layer and large lateral alternation.Small fault recognition,lowrelief structure interpretation and thin sandbody prediction is difficult in the area.By using the new acquired highprecision 3D seismic data,we proposed the methods including combination of multidirections crosssections and time slices,constraint by coherent slice and seismic sections as well as dynamic and static development data,to carry out fine interpretation of small faults and crosswell buried fault.Through sensitivity analysis of seismic attributes and comprehensive application of multi seismic attributes,the sandbodies were quantitatively characterized.Through the above research,the distribution of crosswell faults with the displacement longer than 10m was interpreted,and the crosswell alternation of single sand bodies thicker than 5m were characterized.