深水油气勘探关键评价技术及其在东非海域的应用

Key evaluation techniques for deep-water petroleum exploration and its application in the offshore of East Africa

近年来,在东非莫桑比克海域深水区发现了多个巨型天然气藏,使得该区域成为全球天然气勘探的热点区。莫桑比克海域总体上勘探程度低,深水沉积体系的研究不够深入,制约了油气的精细勘探。基于岩心、测井及三维地震资料,集成了深水沉积层序地层分析技术、深水沉积结构单元综合描述技术、深水沉积储层预测及流体识别技术和深水沉积储层三维地质建模技术等深水油气勘探关键技术,建立了莫桑比克海域鲁伍马盆地层序地层格架,形成了深水沉积结构单元综合描述图版,有效预测了深水沉积储层展布及流体分布。研究成果为储量评估和井位论证提供了技术支撑,助推了鲁伍马盆地万亿方巨型气田开发,取得了良好的应用效果。

In recent years, several giant gas reservoirs have been found in the deep-water area of offshore Mozambique in East Africa, making this area the focus of gas exploration in the world. However, the exploration degree in this area is low, and the research on deep-water sedimentary system is at a low level, which restricts the fine petroleum exploration in this area. Based on core, logging, and3 Dseismic data, the sequence stratigraphic framework of Rovuma Basin in Mozambique sea area is established by integrating the key technologies of deep-water oil and gas exploration, such as deep-water sedimentary sequence stratigraphic identification and division method, deep-water sedimentary structural unit comprehensive description technology, deep-water sedimentary reservoir prediction and fluid identification technology,and deep-water sedimentary reservoir3 Dgeological modeling technology. A comprehensive description chart of deepwater sedimentary structural elements was formed, which was used for effectively predicting the distribution of deepwater sedimentary reservoirs and fluid distribution. The research results provide technical support for reserve evaluation and well deployment, boost the development of trillions of cubic meters of giant gas fields in Rovuma Basin, and achieve good application results.