渤南洼陷深层(沙四段)油气成藏模拟实验研究

综合渤南洼陷实际地质资料,认为渤南洼陷深层具备油气成藏条件,并总结出两种深层油气成藏模式,即自生自储型和上生下储型成藏模式,后者主要以侧向供烃方式为主.借助物理模拟实验对油在两种成藏模式中的充注、运聚过程进行了研究.实验表明,储层物性特别是渗透率是影响油能否充注到储层中的关键因素;储层中的含油饱和度主要受充注压力、注油量的影响,并随其增大而增大,但不超过60%;储层物性只对含油饱和度增长速率影响较大,但对其大小的影响不大;储层物性影响油运移过程中的受力情况,从而限制了油在储层中的运移方向,最终影响油的聚集程度———含油饱和度的增长.

Simulation experiments of the hydrocarbon accumulation in the deep zone of Bonan Sub-sag, Jiyang Depression, Eastern China

Based on the integrated analysis of the actual geological data of Bonan Sub-sag, it is held that there are the favorable conditions for hydrocarbons accumulation in the deep zones of Bonan Sub-sag, and there are two patterns of hydrocarbon accumulation. One is the "self-generation and self-storage" pattern of Es4, and the other is the "down-generation and up-storage" pattern of ES3 generating and ES4 storing. The hydrocarbon filling-injecting processes of the two hydrocarbon accumulation patterns are simulated by sand-box experiments, and the controlling factors of hydrocarbon filling-injecting under the two hydrocarbon accumulation patterns are studied. It is shown that the physical properties of reservoir, especially permeability play the key role in whether hydrocarbon can be injected into reservoirs; the oil saturation in reservoirs is mainly influenced by hydrocarbon filling-injecting pressure and filling-injecting amount, and it increases with the increase of them, usually being less than 60% ; the physical properties of reservoir only influence the increasing rate of oil saturation and have little effect on its magnitude; during the hydrocarbon migration process, the physical properties of reservoir influence its force-conditions and therefore not only determine the direction and dominant pathway of hydrocarbon migration, but also influence the increase of the oil saturation to a certain extent.