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Diageneses and Their Influences on Reservoir Properties of Chang 2 Oil Member in Renshan Region, Zhidan Oilfield, Ordos Basin
Author(s) -
YANG Kang,
ZHOU Xue,
LI Hong,
XIE Wei,
DONG Yangkun,
LIU Yongjie,
SONG Shijun,
ZHAO Leizhao
Publication year - 2017
Publication title -
acta geologica sinica ‐ english edition
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.444
H-Index - 61
eISSN - 1755-6724
pISSN - 1000-9515
DOI - 10.1111/1755-6724.13227
Subject(s) - geology , structural basin , petroleum engineering , geochemistry , petrology , geomorphology
Yanchang Formation in Upper Triassic, Ordos basin contains the most abundant hydrocarbon resources in North China (Wang et al., 2014). The sandstones are the most important oil-bearing reservoirs in Yanchang Formation, and their reservoir properties are usually controlled by initial sedimentary compositions and subsequent diagenetic modifications (Mansurbeg et al., 2008; Ozkan et al., 2011; Jin et al., 2016). Chang 2 oil member, the upper part of Yanchang Formation, characterized as layers of fluvial sandstones, siltstones, and mudstones, is one of the major productive reservoirs in Zhidan Oilfield. However, the exploitation facts show that Chang 2 reservoirs are highly heterogenetic and that seriously constrains the productive efficiency. Here, based on cores and thin-section observations, granularity analysis, scanning electron microscope (SEM), electron microprobe analyses (EMPA), X-ray diffraction, nuclear magnetic resonance (NMR) experiments, and fluid inclusions analysis, petrological features, diageneses and diagenetic stages of Chang 2 sandstones are investigated aiming to discuss the diagenetic influences on reservoir properties in Renshan region, Zhidan Oilfield.