摘要
东濮凹陷是渤海湾盆地中既富油又富气的主要凹陷之一 ,凹陷内深层超压现象十分突出。为了深入认识凹陷超压与深层气分布的内在关系 ,弄清深层油气的成藏特点 ,以便进一步指导勘探 ,以钻井、岩心、分析化验资料为基础 ,通过实验模拟 ,并以成藏动力学的相关理论为指导 ,建立了东濮凹陷超压封存箱的结构 ,进而深入研究了超压与深层气成藏的关系。提出了凹陷内超压封存箱控制下的 3种天然气成藏模式 ,认为储集条件、盖层条件和超压环境是深层气聚集和分布的重要控制因素 ,超压过渡带或过渡带中的局部高压异常区是深层气的有利分布区。根据具体的成藏模式和成藏控制因素 ,提出了凹陷内深层气的有利勘探方向 。
Dongpu Depression is one of the main depressions being rich in both oil and gas in Bohai Gulf Basin and the deep overpressure phenomenon is very outstanding in the depression.In order to recognize deepgoingly the internal relation between the overpressures and the deep gas distribution in the depression and to find out the reservoiring characteristics of deep oil and gas so as to guide further oil and gas exploration,the overpressure compartment structure in Dongpu Depression was determined through experimental simulation on the basis of drilling,core and assay data and by applying the relevant theories of reservoiring dynamics,then the relation between the overpressure and the deep gas reservoir formation was deepgoinly studied.Three gas reservoiring models controlled by the overpressure compartment in the depression are firstly put forward in the paper.It is considered that the reservoir/caprock conditions and overpressure circumstances are the important control factors affecting deep gas accumulation and distribution,and the overpressure transitional zones or the local high-pressure anomaly areas in the zones are the beneficial distribution regions of the deep gas.According to concrete reservoiring model and control factors,the favourable exploration targets for the deep gas in the depression are proposed in the paper,of which parts have been proved by the more recent exploration wells.
出处
《天然气工业》
EI
CAS
CSCD
北大核心
2004年第12期14-16,共3页
Natural Gas Industry
