Tight oil reservoir formation conditions and main controlling factors of Yanchang Formation in southeastern Ordos Basin

被引：0
作者：
机构：
[1] State Key Laboratory for Continental Dynamics, Northwest University, Xi'an
[2] Daqing Oil Field Company Ltd., PetroChina, Daqing
来源：
Ren, Z. (renzhanl@nwu.edu.cn) | 1600年 / Use me卷 / 35期
关键词：
Accumulation condition; Ordos Basin; Tectonic-thermal event; Thermal history; Tight oil; Timing of petroleum accumulation;
D O I：
10.11743/ogg20140203
中图分类号：
学科分类号：
摘要：
No breakthrough has been made in tight oil exploration of the Yanchang Formation in southeastern Ordos Basin because of the low level of research on tight oil accumulation conditions. In order to evaluate tight oil exploration prospect of the Yanchang Formation, we studied in-detail the tight oil accumulation conditions in the study area studying respects of sedimentary microfacies, reservoir rock, cap rock and hydrocarbon migration. The high quality source rocks of Chang 7(7th Member of the Yanchang Fm)are widely developed in the southeast region of the basin. The reservoir of the Yanchang Formation is tight. The favorable source-reservoir combination provided good geological conditions for tight oil accumulation. The Chang 6, Chang 7 and Chang 8(the 6th, 7th and 8th Members of the Yanchang Fm) intervals are the main targets for exploration of tight oil in the Yanchang Formaiton in the study area. Tight oil reservoir formation and enrichment are controlled by sedimentary microfacies and quality reservoirs. Based on the study of inclusions temperature, thermal history, illite dating, saturation pressure and other methods, the tight oil accumulation period in Yanchang Formation is set at the Early Cretaceous and was controlled by the Late Mesozoic tectonic thermal event, thus tight oil accumulation occurred in late stage.
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页码：190 / 198
页数：8
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