文昌A油田珠二段I油组隔夹层分布研究

Study on Interlayer Distribution of I Oil Group in Member 2 of Zhujiang Formation in A Oilfield

文昌A油田珠二段I油组是该油田的主力油组,其生产现状表明隔夹层的类型、对地层水的封隔能力以及空间展布严重影响油藏的开发效果。岩芯观察、薄片鉴定及物性分析后认为,研究区珠二段I油组广泛存在着钙质、泥质和物性3类隔夹层,其中钙质隔夹层对开发的影响最大。由于井少,井网密度稀,取芯有限,仅从岩芯和测井上识别隔夹层不足以研究全区隔夹层的空间分布规律。在小层精细划分对比,沉积微相,测井精细解释研究的基础上,充分利用水平井水平段的信息,结合地球物理信息,通过井震结合,创新性地应用相控约束下的地震协同序贯高斯随机模拟方法建立隔夹层的模型预测隔夹层三维空间展布规律。预测结果与生产动态吻合,为油田增产和剩余油挖潜措施提供了有力的依据。

The I Oil Group in Member 2 of Zhujiang Formation in A Oilfield is the main reservoir. It＇s production status shows that the type, sealing ability and spatial distribution of the interlayer severely affect the reservoir development effect. Through analyzing the core observation, thin section identification and physical analysis, we consider there widely exist calcareous, argillaceous and physical inter-layers. The calcareous interlayer most seriously affects the development. Because of the few well numbers, sparse well network density and limited coring, we cannot study the spatial distribution of interlayer of the whole district only by distinguishing intercalations from the core and logging. On the basis of finely dividing and correlating layers, sedimentary microfacies, the research makes full use of horizontal section information, combines well and seismic, unites geophysical information and successfully predicts the three-dimensional spatial distribution of interlayer by analyzing the model, which is established due to the innovative application of seismic cooperative sequential Gauss simulation on sedimentary facies tract conditions. The predicted results are agreed with the dynamic production, it provides a strong basis for oilfield oroduction and measures for tanoin~ t^otential of remainin~ oil.