南海东部白云深水区复杂地层精细岩石物理分析

白云A探区位于南海东部深水区白云凹陷西南部,具有形成大型油气田的地质基础,是珠江口盆地南海深水最重要的天然气探区。该区白云A井钻前预测将钻遇极具价值的砂岩储层,预测结果乐观,实钻结果与预期严重不符,为泥质-粉砂质浊积砂岩,这一结果使勘探该区的信心严重受挫。为探明该区勘探潜力,针对目的层开展精细岩石物理分析并研发相关技术,形成了以岩石物理分析、岩石物理建模、流体替换、岩性分类预测等组合技术系列,可客观有效地认识该区储层岩石物理特征,为后续储层预测、烃类检测及岩性预测工作指明了方向。

Fine petrophysical analysis on complex formation in Baiyun deep water area of eastern South China Sea

Baiyun A exploration area is located at the southwest of deepwater Baiyun Sag in eastern South China Sea. This exploration area has the geology basis forming large oil and gas field and is the most important natural gas exploration area in the South China Sea deepwater region of Pearl River Mouth Basin. In this area, the Baiyun A well was be predicted to be the valuable sandstone reservoirs before drilling, ttowever, actual drilling results greatly deduce the confidence of this exploration area and the reservoir is shale to silty turbidite sandstones. In order to prove the exploration potential in the area, the fine rock physics analysis technology is used for the target zone. The technique series composed of petrophysical analysis, rock physics modeling, fluid substitution, lithology classification and predicting techniques are determined, which can recognize objectively and effectively the reservoir petrophysical characteristics of this area. This study points out the direction for the next exploration step.