大民屯凹陷成藏动力系统划分及特征研究

The demarcation and feature study of petroleum migration and accumulation dynamic system of Damintun Depression

邱芳 刘吉群

Qiu Fang Liu Jiqun

中国石油辽河油田海南油气勘探分公司, 辽宁盘锦 124010; 中国石油辽河油田分公司兴隆台采油厂, 辽宁盘锦 124010

PetroChina Liaohe Oilfield Hainan Oil & Gas Exploration Company, Panjin 124010, China; Xinglongtai Petroleum Production Factory, Liaohe Oil field Branch Company, PetroChina, Panjin 124010, China

大民屯凹陷处于勘探的中后期,迫切需要新的研究思路和方法对其油气富集规律进行深化认识。根据成藏动力系统划分原则,结合构造沉积演化、烃源岩发育特点、储层类型、超压在垂向和平面上的展布、油源对比分析,将大民屯凹陷划分为底部它源高蜡油潜山成藏动力系统、下部自源高蜡油成藏动力系统、中部它源高蜡油成藏动力系统、中部混源正常油成藏动力系统和上部它源正常油成藏动力系统等5个成藏动力系统。利用油藏规模序列法和圈闭加和法对该区各成藏动力系统的待发现油藏规模进行了预测,认为底部它源高蜡油潜山成藏动力系统勘探潜力最大。

Petroleum migration and accumulation dynamics offer new method for the study of petroleum distribution rule. It has come to the high exploration stage in Damintun Depression, so it calls for new study thoughts and methods. According to the demarcation principle of petroleum migration and accumulation dynamics system, integrating the tectonic and sedimentation evolution, hydrocarbon source feature, reservoir type, the vertical and horizontal distribution of overpressure and the oil rock correlation analysis, there come to five petroleum migration and accumulation dynamic systems:other source high-waxy oil buried hill at the bottom, auto source high-waxy oil in the lower part, other source high-waxy oil in the middle part, mixture source normal oil in the middle part and other source normal on the top. By the method of reservoir scale sequence and trap addition, the reservoir scale to be discovered of each system is predicted. It is concluded that the petroleum migration and accumulation dynamic system of other source high-waxy oil buried hill at the bottom is of the best exploration potential.