基于岩性相单元的低孔低渗碎屑岩储层质量精细评价——以珠江口盆地HZ25-7构造古近系文昌组为例

发布时间：2018-09-10 17:35

【摘要】：针对深层系储层勘探评价中遇到的岩性复杂、物性变化大的难题,以珠江口盆地HZ25-7构造古近系文昌组低孔低渗储层为例,利用电成像测井纵向分层的高分辨率优势,在宏观岩性识别和沉积层理构造解释的基础上,以微尺度的岩性相为单元,共划分出14种岩性相类型,分析了目的层段2种河道单元内部的岩性相组合序列,揭示了储层纵向上的非均质性特征。根据岩心物性分析并刻度常规测井和电成像测井,对各类岩性相单元开展物性评价。结果表明,在相同的成岩作用背景下,粒度和沉积层理构造对物性有明显控制作用:随着粒度由粗变细,层理构造由槽状交错层理、板状交错层理到块状层理,储层物性逐渐变差。在文昌组寻找优质储层,应以河道单元中上部岩性较粗且交错层理发育的高能沉积岩性相单元为主要目标。
[Abstract]:In view of the complex lithology and large change of physical properties encountered in the exploration and evaluation of deep system reservoirs, taking the low porosity and low permeability reservoirs of the HZ25-7 structure of the Paleogene Wenchang formation of the Paleogene in Pearl River mouth Basin as an example, the high resolution advantage of vertical stratification of electric imaging logging is used. On the basis of macroscopic lithology identification and sedimentary stratigraphic structure interpretation, 14 lithofacies types are divided into 14 lithofacies types taking microscale lithologic facies as units, and the lithologic facies assemblage sequences within two channel units in the target section are analyzed. The characteristics of reservoir heterogeneity are revealed. According to core physical properties analysis and calibration of conventional logging and electrical imaging logging, physical property evaluation of various lithologic facies units is carried out. The results show that, in the same diagenesis background, the grain size and sedimentary stratigraphic structure control the physical properties obviously: with the grain size changing from coarse to fine, the bedding structure changes from trough interlaced bedding, plate interlaced bedding to block bedding. The physical properties of the reservoir are getting worse. In order to find high quality reservoir in Wenchang formation, the high energy sedimentary facies unit with coarse lithology and interlaced bedding in the upper part of the channel unit should be the main target.
【作者单位】：中海油田服务股份有限公司;中海石油(中国)有限公司深圳分公司;
【基金】：中国海洋石油总公司“十二五”重大科技项目“中国近海低孔低渗油气藏勘探开发关键技术与实践(编号:CNOOC-KJ 125ZDXM 07 LTD)”部分研究成果
【分类号】：P618.13

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