高校地质学报2017，Vol.23Issue(2)：296-303,8.DOI:10.16108/j.issn1006-7493.2016211
毛细管力的初次运移及成藏作用有效性分析
Effectiveness of Capillary Pressure on the Primary Migration of Oil and Its Accumulation
摘要
Abstract
The difference of capillary pressures acting on oil droplet is commonly considered as the critical force for the primary migration of oil and driving oil to accumulate in reservoirs in source sequences.The prerequisite for the oil migration from thinner pores to larger pores under the force of capillary pressure is that pore surface is water wet.In this study,we address the wettablities of sandstones and shales in the Middle Layer of the 3rd Member of the Shahejie formation(Es3m) of the Dongying depression,and discuss the impact of wettablity on capillary force and roles on oil migration.In the study area,lots of Es3 m sandstones that are surrounded by mature source roks have relatively low oil-bearing levels and majority of the oils found in these reservoirs are not from the surrounding source rocks but from deeper source rocks.Some sandstones in the study area have wettability reversal from water-wet to oil-wet,which is caused by that the sandstones are contacted with oil with high abundance of NSO and asphaltenes.The shale source rocks show neutrally wet to oil wet in general during the hydrocarbon generation.Owing to the change of wettability of rock surface,the direction of capillary force is altered correspondingly,which further leads to the capillary force being invalid for driving oil primary migration or accumulation to inner-source rock reservoirs.The wettability reversal is one of the possible reasons causing the low oil-bearing level of the Es3msandstones.We suggest that for the source rocks with high organic richness and relatively low maturity,the efficiency of capillary pressure acting as force to drive oil primary migration or accumulation to inner-source rock reservoirs may be limited.关键词
毛细管力/初次运移/成藏动力/润湿性/润湿性反转/东营凹陷Key words
Capillary force/primary migration of oil/dynamics of petroleum accumulation/wettability/wettability reversal/Dongying depression分类
天文与地球科学引用本文复制引用
包友书,张林晔,张守春,徐大庆,王宇蓉,张蕾,吴连波..毛细管力的初次运移及成藏作用有效性分析[J].高校地质学报,2017,23(2):296-303,8.基金项目
国家自然科学基金项目(41372129 （）
41072096) （）
国家973课题(2014CB239101 （）
2014CB239105) （）
中石化科技攻关项目(P15117)联合资助 （P15117）
