渤南洼陷深层(沙三/沙四段)原油-水-岩石相互作用模拟实验研究

为了能更好地研究地层温压条件下原油-水-岩石相互作用发生的化学变化及其对成藏条件特别是储层物性等的影响,结合渤南洼陷深层的成藏条件及流体动力系统等特征,进行物理实验模拟。结果表明:1)在一定的温压条件下(温度120℃、压力45MPa)岩石及实验后的原油化学成分及生物标志物均发生了变化。油样的饱和烃含量增加,沥青质+非烃含量明显降低;油砂的饱和烃含量沿实验装置从下到上逐渐增加,最高值达62.22%,沥青质+非烃含量由40.55%下降到12.78%。实验样品的生物标志物及族组成显示油沿着实验装置从下向上运移过程中发生了地质色层效应。2)原油-水-岩石相互作用以溶蚀作用为主,并随原油在实验本体内从下向上的运移而逐渐增强。溶蚀作用的结果改善了普遍以低孔低渗为特征的深部储层的物性,为深层油气的运移和保存提供了有效空间。

Experimental Simulation on Oil-Water-Rock Interaction in the Deep Bonan Sub-sag

One dimension experimental apparatus composed of fluid input/output system, experimental nomenon, T/P controlling system, as one of the very effective methods studying the subsurface hydrocarbon origin, migration, accumulation and reservoir reconstruction is adopted to simulate oilmigration and accumulation in deep zones in this paper. And the interaction of oil-water-rock under actual high temperature and high pressure (120℃, 45MPa) was simulated. The results showed thatmany changes including their chemical components and rock inner structure etc., under certain temperature and pressure, occurred during petroleum migration from the bottom up along the apparatus with the increased charging quantities, and interaction with sandstone and formation water in apparatus. And the specific changeswere as follows: 1. Many changes took place in the rock structure and its chemical components of inner hydrocarbon. Vertically, saturated hydrocarbon content of oily-sands gradually increased from the bottom up, and the peak value12.78%. And the biomarkers and family components of all samples derived from experiment show the existence of geochromatographic effect during the oilmigration along the apparatus. 2. A certain extent dissolution has acted on mineral component of oily-sands during the oil-water2rock interaction, and it strengthens gradually during hydrocarbon migration from the bottom up along the apparatus. Just because of this dissolution, the property of deep reservoirswith low porosity and permeability has been greatly imp roved, and it supplies effective space for deep hydrocarbon migration and accumulation.