稀疏脉冲和基于模型反演在王家岗沙四段砂岩油藏精细勘探中的应用

1998年11月,胜利油田王家岗地区的第一口发现井（WX119井）在埋深2500－3000m的沙河街组沙四段砂岩中发现了高产工业油气流,随后如何进一步确定含油砂体展布范围和空间厚度变化成为对油藏作进一步评价和开发的关键。在研究区仅有4口井的情况下,利用基于道的稀疏脉冲三维地震反演方法确定了含油砂体的分布范围及厚度变化,据此部署的3口评价井和1口探井都获得了高产工业油气流。根据与已知含油砂体的波阻抗特征的类比,对没有钻探的高阻抗区进行钻探以使含油气范围不断扩大。钻井数达30口,其中仅2口井失利。为了进一步搞清含油砂体分布范围,我们采用了基于地质模型的三维地震反演,对所钻遇的油层分布进行了预测,分析了失利井的原因,提供了新的钻探目标,并为开发井的部署提供了有利的地质依据。

Application of sparse pulse and inversion based on model in rolling exploration and development of sand body reservoir in Es_4 member, Wangjiagang area.

After finding commercial oil and gas flow with high production in Es 4 member in the depth of 2500~3000m at discovery well WX 119 in Nov.,1998 in Wangjiagang area, Shengli Oilfield, how to further determine distributing scope and spatial thickness variation of oil bearing sand body is the key to further appreciating and developing the reservoir. On the basis of 4 wells only having in the studying area, using 3 D seismic inversion based on sparse pulse of traces to determine the scope of distribution and thickness variation of oil bearing sand body. The 3 appraisal wells and an exploratory well have been successfully deployed, which obtained commercial petroleum flow with high production. Later on, according to comparison with wave impedance feature of known oil bearing sand body, drilling in high impedance area without drilling activity before has been carried out in order to enlarge continuously the oil bearing scope. The number of drillings reached 30, among which two were failure. In order to further clarify the distributing scope of oil bearing sand body, we used 3 D seismic inversion based on geologic model to predict the distribution of drilled oil bearing strata, analyzed the reasons ofYM5"BZ=402] failed wells and provided again new drilling targets and favorable geologic bases for deployment of development well.