疏松砂岩稠油层油水赋存特征及识别——以济阳坳陷沾化凹陷馆下段稠油油藏为例

发布时间：2018-05-26 17:35

本文选题：疏松砂岩 + 稠油油藏　；参考：《中国矿业大学学报》2017年05期

【摘要】：对胜利油田疏松砂岩稠油油层中孔隙结构分布及油、水赋存状态进行研究,选取济阳坳陷沾化凹陷馆下段疏松砂岩稠油油藏岩样,开展岩心微米尺度的CT扫描检测,利用油水散失校正后的岩心分析残余油水饱和度,对CT扫描图像进行反演标定,确定了不同流体的灰度区分界限值,认为疏松砂岩稠油储层具有与传统认识不同的油水赋存特征.结果表明:水的灰度区分界限值范围为4 000~4 800;油的灰度区分界限值范围为0~4 000.在稠油储层岩样中除了连通性好的储油孔隙外,存在另外两类孔隙,其中油水赋存形式分别为"分隔水滴"和"孤立油滴".这种稠油油层孔隙分布及油水赋存状态可以较好地解释稠油油藏开发初期即出水的现象,测井解释稠油油层含油饱和度通常比实际密闭取芯值大5%,而稠油油藏构造较低部位井投产初期含水量达到40%以上,也不意味着开采层位到了油水界面,这为修正测井解释饱和度及后期油层有效开发井位部署提供了依据.
[Abstract]:The distribution of pore structure and the occurrence of oil and water in loose sandstone heavy oil reservoirs in Shengli Oilfield were studied. The rock samples of loose sandstone heavy oil reservoirs in the lower Guanhua member of Zhanhua depression in Jiyang depression were selected and the CT scanning of core micron scale was carried out. The residual oil and water saturation is analyzed by using the core after correction of oil and water loss, and the CT scanning image is back calibrated, and the gray level differentiation boundary value of different fluid is determined. It is considered that the loose sandstone heavy oil reservoir has the characteristics of oil and water occurrence which are different from the traditional understanding. The results show that the limit value of gray scale of water is 4 000 ~ 4 800 and that of oil is 0 ~ 4 000. In the rock samples of heavy oil reservoir, there are two kinds of pores except those with good connectivity. The occurrence of oil and water is in the form of separated water droplets and isolated oil droplets, respectively. This kind of pore distribution and oil-water occurrence state of heavy oil reservoir can explain the phenomenon that the heavy oil reservoir is out of water at the early stage of development. Log interpretation of oil saturation in heavy oil reservoirs is usually more than 5% higher than the actual closed core value, while the water content of wells in lower structural parts of heavy oil reservoirs reaches more than 40% at the initial stage of production, which does not mean that the production layers reach the oil-water interface. This provides a basis for the correction of logging interpretation saturation and the deployment of effective development wells in late reservoir.
【作者单位】：同济大学海洋与地球科学学院;中石化胜利油田勘探开发研究院;中国石化股份胜利油田分公司;西南石油大学地球科学与技术学院;
【基金】：国家自然科学基金项目(41672115,41202110) 国家油气重大专项(2016ZX05006-001-003) 中国石化股份公司课题(P14009)
【分类号】：P618.13

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