利用岩心或露头的交错层组厚度预测辫状河河道带宽度--以鄂尔多斯盆地苏里格气田为例

预测辫状河河道带宽度可加强对稀井控制下的地下辫状河河道带砂体沉积规模的了解。根据岩心或露头上 砂岩交错层层组的厚度,利用辫状河河流的满岸水流深度、平均沙丘高度、平均砂岩交错层层组厚度和河道带宽度 之间的统计关系来预测河道带宽度。应用该方法计算了苏里格气田的盒8、山1段辫状河河道带宽度,利用其结果 合理地建立了苏里格气田的沉积模式。该模式与实钻符合程度较高,表明该方法的可靠性,也说明在气田开发早 期井距较大的情况下,应用该方法可认识辫状河砂体的规模和气藏规模。

Prediction of braided channel belt width based on cross-stratum sets thickness measurements of cores or outcrops-taking Sulige gas field, Ordos Basin as an example

Prediction of braided channel belt width may know much about the sedimentary sandbody scale of the braided channel belt controlled by sparse wells. Using the statistical relationships among bank-full current depth, average sand dune height, average thickness of sand cross-stratum sets and width of braided channel belts may predict the width of the channel belts based on sand cross-stratum set thickness measurements of cores or outcrops. By this method, the braided channel belt widths of the eighth member of Shihezi Formation (He8) and the first member of Shared Formation (Shan1) in the upper Permian Sulige gas field of Or-dos Basin were calculated. Using the calculated results, the sedimentary model for Sulige gas field was also reasonably established which is in accord with factual drilling results to a larger extent. This shows the reliability of this method, and also shows its capability of understanding the sizes of braided river sandbodies and gas reservoirs in the case of a relatively larger well spacing during the early stage of gasfield development.