高温高压盆地东方区黄流组三维压力建模技术

The three-dimensional pressure modeling technology for Huangliu Formation of Dongfang area in the HTHP basin

莺歌海盆地是一个富烃盆地,在中深层、特别是在高温超压地层中,存在着众多的大型勘探目标,其中东方区中深层高温超压领域天然气勘探势头良好,其黄流组目的层为中深层勘探的主力层系,已实现探明储量千亿方。准确的压力预测和三维压力模型的建立是勘探取得重大突破的基石,三维压力模型的建立又基于三维岩性模型,本次岩性模型的建立突破了传统的以地震阻抗门槛值为唯一手段的岩性预测方法,而采用三重趋势约束方法构建岩性模型。通过钻后测压数据与钻前预测的三维压力模型数据进行校验,证实三维压力模型建立技术方法的有效性,并指示该技术方法有着广泛的发展应用前景。

The Yinggehai Basin is a hydrocarbon-rich basin,and in the high-temperature and overpressure strata,there exist numerous large-sized exploration targets.Especially in the high-temperature and overpressure field at the medium and deep depths in the Dongfang area,the natural gas exploration is very promising.The target strata of Huangliu Formation in the Dongfang area serve as the major strata,where a thousand billion cubic meters of gas resources have been proved. The accurate pressure prediction and the establishment of the three-dimensional pressure model constitute the cornerstone for the breakthrough in the exploration,and the establishment of the three-dimensional pressure model is based on the three-dimensional lithologic model. The establishment of this lithologic model breaks through the traditional lithologic prediction method in which the seismic impedance threshold value is used as the only means. In this study,the triple constraint trends lithological model is adopted to establish the lithologic model. The verification based on post-drilling pressure-measuring data and pre-drilling predicted three-dimensional pressure model data has proved the effectiveness of the technology of the three-dimensional pressure model,and demonstrated the extensive development vista of this technology.