海相油气地质2017，Vol.22Issue(3)：85-94,10.DOI:10.3969/j.issn.1672-9854.2017.03.011
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
Evaluation of the Clastic Reservoir with Low-porosity and Low-permeability Based on Lithofacies Unit:A Case of Paleogene Wenchang Formation in Structure HZ25-7,Zhujiangkou Basin
摘要
Abstract
The clastic rocks buried deeply are complex and heterogeneous, especially for the low-porosity and lowpermeability rocks, and how to find and characterize the relatively high quality parts of the reservoir is worth exploring. In our case the drilling core is relatively limited, so the electrical image logging with a high resolution of longitudinal layering becomes valuable. In the study of the Paleogene Wenchang Formation reservoir in Structure HZ25-7, Zhujiangkou Basin, 14 types of lithofacies were divided by identification of lithology, grain size and bedding structure according to cores and resistivity images. And 6 lithofacies sequences were described in the two types of channel units, including branch channel of delta-plain and distributary channel of delta-front, which revealing the vertical heterogeneity of reservoir. According to the porosity and permeability of core samples, together with the conventional logging and electrical image logging calibrated by the core, the reservoir can be effctively evaluated on lithofacies units. In the same diagenetic background, particle size and bedding have obvious control effect on reservoir properties. From coarse to fine, the reservoir properties gradually deteriorated; from trough-like interlaced bedding to plate-like interlaced bedding, and then to massive bedding, the reservoir properties gradually get worse. The favorable lithologicfacies in Wenchang Formation developed in the upper part of the river unit with coarse particle and staggered bedding.关键词
珠江口盆地/古近系/碎屑岩/岩性相/低孔低渗储层/层理构造/储层评价Key words
Clastic rock/Lithofacies (Lithologic facies)/Bedding structure/Low porosity-low permeability reser-voir/Reservoir evaluation/Paleogene/Zhujiangkou Basin分类
能源科技引用本文复制引用
杨玉卿,崔维平,冯进,张伟..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[J].海相油气地质,2017,22(3):85-94,10.基金项目
本文为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-KJ125ZDXM07LTD)"部分研究成果 （编号:CNOOC-KJ125ZDXM07LTD）
