| 柴西地区扎哈泉致密油储层特征及评价 |
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| 引用本文： | 吴颜雄,薛建勤,杨智,施奇,李海鹏,刘刚,夏晓敏.柴西地区扎哈泉致密油储层特征及评价[J].世界地质,2018,37(4):1167-1176. |
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| 作者姓名： | 吴颜雄 薛建勤 杨智 施奇 李海鹏 刘刚 夏晓敏 |
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| 作者单位： | 1. 中国石油青海油田分公司勘探开发研究院, 甘肃 敦煌 736200;2. 中国石油勘探开发研究院, 北京 100083;3. 中国石油青海油田分公司测试公司, 甘肃 敦煌 736200 |
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| 基金项目： | 国家科技重大专项（2016ZX05046-006）、中国石油天然气股份有限公司重大科技专项（2016E-01）联合资助. |
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| 摘 要： | 柴西地区致密油储层内部结构复杂、非均质性强,为了更高效地进行致密油勘探开发,利用岩芯薄片、X衍射、场发射扫描电镜、CT扫描和物性分析等方法,对扎哈泉地区上干柴沟组开展致密储层特征及储层物性控制因素研究。研究表明,上干柴沟组为典型的致密储层,以细砂岩和粉砂岩为主,填隙物含量较高,以原生孔隙为主,微米级孔隙是主要的储集空间,有效储层平均孔隙度为5. 9%,平均渗透率为0. 43 m D。储层内部孔隙分布较均匀,总体呈现微米级孔隙加纳米级喉道的特征,其中微米级孔隙基本呈片状分布,连通性好,纳米级孔隙则呈点孤立状分布。储层物性受原始沉积条件和后期成岩作用控制,坝砂泥质含量低,纯度高,物性较好。压实作用和碳酸盐胶结使储层变差,硬石膏胶结对孔隙的影响具有两面性,晚成岩期的溶蚀作用对储层改善作用明显。研究区致密油有效储层可分为三类,其中Ⅰ类有效储层为本区的"甜点"区,是下一步优先勘探开发的重点区块,Ⅱ-Ⅲ类有效储层则是重要的挖潜区,通过工程技术攻关可切实实现柴西地区的增产扩能。
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| 关 键 词： | 致密油 储层特征 储层评价 上干柴沟组 扎哈泉地区 柴西 |
| 收稿时间： | 2018-03-01 |
| 修稿时间： | 2018-09-25 |
Characteristics and evaluation of tight oil reservoirs in Zhahaquan area,western Qaidam Basin |
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| WU Yan-xiong,XUE Jian-qin,YANG Zhi,SHI Qi,LI Hai-peng,LIU Gang,XIA Xiao-min.Characteristics and evaluation of tight oil reservoirs in Zhahaquan area,western Qaidam Basin[J].World Geology,2018,37(4):1167-1176. |
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| Authors: | WU Yan-xiong XUE Jian-qin YANG Zhi SHI Qi LI Hai-peng LIU Gang XIA Xiao-min |
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| Institution: | 1. Research Institute of Exploration & Development, Qinghai Oilfield, PetroChina, Dunhuang 736200, Gansu, China;2. Research Institute of Petroleum Exploration & Development, PetroChina, Beijing 100083, China;3. Well Testing Company, Qinghai Oilfield, PetroChina, Dunhuang 736200, Gansu, China |
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| Abstract: | The tight oil reservoirs in western Qaidam Basin are characterized by complicated inner structure and strong reservoir heterogeneity. In order to develop the tight oil more efficiently, the characteristics of tight oil reservoirs of upper Ganchaigou Formation in Zhahaquan area were studied through observation of thin sections, XRD, SEM and CT scan. The results show that:the upper Ganchaigou Formation is a typical tight reservoir, which mainly consists of siltstone-fine sandstone with high interstitial material. Primary porosity and micron-size pore are the most important reservoir space, and the average porosity of effective reservoir is 5.9%,average permeability is 0.43 mD. The pore throat radius varies from nano-size to micron-size, the micron-size pore shows sheet distribution with good connectivity, while the nano-size pore shows isolated distribution. The property of the reservoir is mainly controlled by deposition and diagenesis. The bar sand is with high sand content, high purity and good physical property. Compaction and carbonate cementation are the major factors that reduced the reservoir quality, while the anhydrite cementation has dual influences. The reservoir quality was improved significantly by dissolution during the late diagenetic period. Effective reservoir of tight oil can be classified into three types, of which the ClassⅠis "sweet spot" of the studied area, with best reservoir conditions and industrial oil flow can be obtained in the conventional oil test. Class Ⅱ and Ⅲ reservoirs are with poor reservoir conditions, which need fracturing to get industrial oil flow. |
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| Keywords: | tight oil reservoir characteristics reservoirs evaluation Upper Ganchaigou Formation Zhahaquan area western Qaidam Basin |
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