Characteristics and implications of micro-lithofacies in lacustrine-basin organic-rich shale: a case study of Jiyang depression, Bohai Bay Basin

被引：0
|
作者：
Liu H. [1 ]
Yu B. [2 ]
Xie Z. [3 ]
Han S. [2 ]
Shen Z. [2 ]
Bai C. [2 ]
机构：
[1] Oil and Gas Exploration Management Center, Sinopec Shengli Oilfield Company, Dongying, 257000, Shandong
[2] School of Earth Sciences and Resources, China University of Geosciences, Beijing
[3] Research Institute of Exploration and Development, Sinopec Shengli Oilfield Company, Dongying, 257000, Shandong
来源：
Shiyou Xuebao/Acta Petrolei Sinica | 2018年 / 39卷 / 12期
关键词：
Bohai Bay Basin; Jiyang depression; Micro-lithofacies; Shahejie Formation; Shale oil;
D O I：
10.7623/syxb201812002
中图分类号：
学科分类号：
摘要：
Shale oil is an important component of unconventional hydrocarbon resources, and is also a hot spot in research of petroleum geology. In China, shale oil resources massively occur in the continental lacustrine basin. Due to the differences between shale oil and conventional oil in reserving, sealing, trapping and migration, the lithofacies have a significant controlling effect on shale oil accumulation. This study focuses on organic-rich shale in the lower sub-member of Member 3 to upper sub-member of Member 4 of Shahejie Formation in Jiyang depression, Bohai Bay Basin. Based on the petrology, whole-rock X-ray diffraction (XRD), total organic carbon (TOC) content and direct hydrocarbon indication (DHI) of the study layers, it is indicated that the micro-lithofacies of shale layers are dominated by thin lenticle crystalline limestone micro-lithofacies (LF1), lamellar micritic limestone micro-lithofacies (LF2), thick massive lime mudstone micro-lithofacies (LF3), massive mudstone micro-lithofacies (LF4)and black shale micro-lithofacies (LF5). Among them, the favorable micro-lithofacies (or combination)for shale oil accumulation are LF5, LF4 and LF1+LF5. There are two shale oil accumulation models in Jiyang depression: one is the "self-generation and self-reservoir" model dominated by LF4 and LF5; the other is the "crystalline limestone reservoir" model dominated by LF1+LF5. The crystalline limestones are more beneficial to shale oil accumulation, development and production, and the LF1+LF5 is the "sweet spot" micro-lithofacies combination for continental shale oil exploration and development in Jiyang depression. © 2018, Editorial Office of ACTA PETROLEI SINICA. All right reserved.
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页码：1328 / 1343
页数：15
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