碳酸盐岩沉积相带分析及地震预测——以邵家地区沙四段为例

Sedimentary facies analysis of carbonate rock and seismic forecasting——A case study of Sha 4 section in Shaojia area

邵家地区沙四段碳酸盐岩油气成藏受岩石类型和沉积相带严格控制,厚度大,纯灰岩的区带油气往往较容易成藏。由于灰岩为高速体,在地震剖面上都表现为一组连续的强反射,其不同沉积相带以及相带厚度的变化从地震反射特征上难以识别。针对此问题,建立正演模型,结合测井资料,对模型进行属性提取分析,选取了敏感属性,有效指导了碳酸盐岩油藏的相带预测,总结了三种预测沙四段碳酸盐岩的有效方法,预测结果与已完钻井吻合较好。

The carbonate- rock hydrocarbon accumulation of the fourth member of Shahejie Formation in Shaojia area is strictly controlled by rock types and sedimentary facies. It is easy to accumulate oil and gas in carbonate rocks having larger thickness and high purity. According to limestone ＇ high speed and a group of continuous strong reflection on seismic profile, it is difficult to identify the limestone sedimentary facies belt and the change in thickness of facies belt from the seismic reflection features. To solve this problem, a forward model is built. By collecting and analyzing of reservoir attrib- utes and selecting sensitive attributes, and combined with logging information, the facies belt prediction of carbonate rock reservoir was effectively carried out. Three methods were summarized to predict carbonate reservoir in the fourth member of Shahejie Formation. The prediction results are in good agreement with the actual of the drilled wells.