鄂尔多斯盆地中西部长2油层低阻成因分析

An Analysis of the Causes of Chang 2 Low Resistivity in Middle-western Ordos Basin

陈世加 高兴军 喻建 马捷 黄海

CHENShijia GAOXingjun YUJian MAJie HUANGHai

西南石油大学地球科学与技术学院, 四川 成都 610500 天然气地质四川省重点实验室, 四川 成都 610500 陕西延长油田股份有限公司靖边采油厂, 陕西 榆林 718500 中国石油长庆油田分公司, 陕西 西安 710018

School of Geoscience and Technology, Southwest Petroleum University, Chengdu, Sichuan 610500, China Sichuan Province Key Laboratory of Natural Gas Geology, Chengdu, Sichuan 610500, China Jingbian Oil Production Plant, Shaanxi Yanchang Petroleum Co. Ltd., Yulin, Shaanxi 718500, China Changqing Oilfield Company, PetroChina, Xi'an, Shaanxi 710018, China

鄂尔多斯盆地中西部延长组长2油层电阻率偏低难以识别，且低阻成因是分析和识别低阻油层的基础。因此，对研究区油层低阻成因展开综合研究具有实际意义。利用岩石物理实验资料、测井资料及试油资料，分析各地质要素与电阻率的关系，明确研究区油层低阻的主要成因。研究表明：研究区延长组长2油层低阻主要受高束缚水饱和度、高地层水矿化度及复杂孔隙结构的控制，而与储层中导电矿物含量无关；此外，储层中黏土矿物含量、种类以及碎屑颗粒粒度对研究区油层低阻也有一定的影响。

The reservoir resistivity of the Chang 2 Oil Formation is too low to be identified in the midwestern Ordos Basin. The causes for the low resistivity are the basis for the analysis and identification of low-resistivity reservoirs. The study of the low resistivity of the Chang 2 Formation is therefore important. The relationships between each geological factor and the reservoir resistivity were analyzed in the study area to determine the main reasons for the low resistivity using the analysis of data from rock physics experiments and logging and oil test data. The results show that the low resistivity is mainly controlled by the highly irreducible water saturation, high salinity of the stratum water, and complex pore structure; however, it is not governed by the content of conductive minerals in the reservoir. Moreover, the clay mineral content and the small clastic grain size have a small effect on the reservoir resistivity.

10.11885/j.issn.1674-5086.2015.06.11.01