摘要
莺歌海盆地中深层特别是高温超压地层中,存在着众多的大型勘探目标,但因其所固有的错综复杂的地质特性,使天然气勘探面临的成藏理论、地层压力预测、钻井安全等问题在业界没有成功的经验可资借鉴,从而导致该盆地勘探进展缓慢。通过近几年对该盆地地层压力预测模式的研究,发现异常压力层段的波阻抗随深度增加而减小,局部有强烈的倒转现象发生,结合已钻井的测压、测试等数据,建立起了盆地不同构造位置的压力预测模型,并在该区压力预测实践中取得了良好效果;同时还在天然气成藏理论上取得了新的认识,DF13E井在中深层的新近系中新统上部黄流组一段获得优质高产气流,证明了中深层强超压领域(压力系数大于1.8)可以形成优质气藏,拓宽了该盆地天然气勘探领域。
Many large exploration targets exist in the deep layers especially those with high temperature and ultra-high pressure in the Yinggehai Basin.However,the inherent complexity of its geological conditions challenges gas exploration.There are no successful learning experiences in hydrocarbon accumulation theory,formation pressure prediction,drilling safety,etc.,which impedes exploration in this basin.The study of formation pressure prediction models in recent years reveals that wave impedance of intervals at abnormal pressures decreases with the increasing of burial depths and shows the phenomenon of locally strong inversion.These understandings in combination with the measured pressure and test data of the drilled wells were used to build pressure prediction models for different structural locations in this basin.These models have been successfully applied in pressure prediction in this study area.Moreover,new insights were obtained in gas accumulation theory and high gas flow was achieved in the well testing of DF13E in the first member of the Upper Miocene Huangliu Formation with moderate-to-large burial depths.This verifies that gas pools of high quality may occur in the medium-deep layers with ultra-high pressures(pressure coefficient over 1.8),which widens the domain of gas exploration in this basin.
出处
《天然气工业》
EI
CAS
CSCD
北大核心
2011年第12期21-25,124-125,共5页
Natural Gas Industry
关键词
莺歌海盆地
温度
压力预测模型
成藏理论
新认识
勘探区
勘探方向
Yinggehai Basin,temperature,pressure,prediction,model,hydrocarbon accumulation,new understanding,exploration zone,exploration orientation
