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Acid Sensitivity Characteristics of Reservoir and Main Controlling Factors of Chang-82 Oil-bearing Interval in Eastern Jiyuan Oilfield of Ordos Basin, China(PDF)

《地球科学与环境学报》[ISSN:1672-6561/CN:61-1423/P]

Issue:
2017年第05期
Page:
669-682
Research Field:
基础地质与矿产地质
Publishing date:

Info

Title:
Acid Sensitivity Characteristics of Reservoir and Main Controlling Factors of Chang-82 Oil-bearing Interval in Eastern Jiyuan Oilfield of Ordos Basin, China
Author(s):
MAO Shu-wei JIAO Tao XIONG Tao QIN Zhi GAO Yin-shan BAO Zhi-dong ZHENG Xi LI Jun-jian SONG Jian HE Ling-yuan QIN Qin
1. College of Geosciences, China University of Petroleum, Beijing 102249, China; 2. State Key Laboratory of Petroleum Resources and Prospecting, China University of Petroleum, Beijing 102249, China; 3. No.5 Oil Production, Changqing Oilfield Company, PetroChina, Xian 710021, Shaanxi, China
Keywords:
acid sensitivity mineral pore characteristic main controlling factor diagenesis Chang-82 oil-bearing interval Jiyuan oilfield Ordos Basin
PACS:
P618.130.2
DOI:
-
Abstract:
Based on XRD, SEM, slice image and acid sensitivity experiment, the acid sensitivity of reservoir of Chang-82 oil-bearing interval in the eastern Jiyuan oilfield of Ordos Basin was analyzed. The results show that the acid sensitivity of reservoir of Chang-82 oil-bearing interval is dominated with amendment-weak sensitivity; clay and calcareous cements of reservoir are serious, the heterogeneity is strong, and the main acid sensitivity minerals are chlorites and calcite minerals; the relative large porosities of some samples are reduced by the spallation of partial coniferous chlorite and chlorite film, which blocks the porosities and throats in the acid sensitivity experiment; meanwhile, the effects of the precipitation of ferric hydroxide (Fe(OH) 3) and gel on the reservoir physical properties are limited, and the corrosion of calcareous cement compensates the negative effects on reservoir; whereas, the calcium fluoride (CaF2) is the direct factor to the damage of physical properties in acid sensitivity experiment, indicating that the hydrochloric acid is more suitable for the reservoir improvement than mud acid; the underwater distributary channel is the suitable place for the development of acid mineral, including that the chlorite and calcite/ferrocalcite, and the chlorites cement with high content distribute well near the provenance, while the distribution of a relative high content of calcites/ferrocalcites is far away from provenance; the contents, types, and distribution of acid mineral are controlled by sedimentary provenance, sedimentary microfacies and diagenesis, especially the thermolysis and decarboxylation of organic material in Chang-82 oil-bearing interval occur along with the dissolution and metasomatism during the diagenetic stage, having an important influence on the formation, types and the existence condition of acid mineral.

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Last Update: 2017-10-19