商河油田商25断块沙四段储层特征及控制因素

Reservoir characteristics and its controlling factor of the fourth member of Shahejie Formation in Block Shang 25 of Shanghe Oilfield

李世银 李胜军 罗彩明

1.塔里木油田分公司勘探开发研究院，新疆 库尔勒 841000; 2.中国石油勘探开发研究院西北分院，甘肃 兰州 730020

Research Institute of Exploration and Development, Tarim Oilfield Company, CNPC, Kuerle 841000, China

商25断块是商河油田的主要含油区块。利用大量第一手资料，研究和剖析了研究区沙四段的储层特征，探讨了影响物性特征的几个主要因素。研究结果表明，该区储层主要为中孔、中低渗储层，且沙四下亚段储层物性优于沙四上亚段储层；沉积相带的不同及压实、胶结、溶蚀等成岩作用是影响储层物性的主要因素。

Block Shang 25 is the main oil-bearing tract in Shanghe Oilfield. According to the study of a great number of first hand
information, the reservoir characteristics of the fourth member of Shahejie Formation are analyzed in the research area and the
dominant factors of affecting the reservoir physical property characteristics are discussed. The study results indicate that the
reservoirs belong to the medium porosity and medium to low permeability reservoirs in the area and that the reservoir physical
property of the lower fourth member of Shahejie Formation is better than in the upper fourth member of Shahejie Formation. The
different sedimentary facies and the diagenesis, such as compaction, cementation, denudation, are the major controlling factors of
reservoir physical property.