Analysis of accumulation conditions of lacustrine organic-rich shale oil affected by volcanic ash: a case study of the Lucaogou Formation in the Tiaohu-Malang sag, Santanghu basin

被引：0
作者：
Pan Y. [1 ,2 ]
Huang Z. [1 ,2 ]
Guo X. [3 ]
Li T. [1 ,2 ]
Fan T. [4 ]
Xu X. [4 ]
机构：
[1] College of Geosciences, China University of Petroleum, Beijing
[2] State Key Laboratory of Petroleum Resources and Prospecting, China University of Petroleum (Beijing), Beijing
[3] School of Earth Sciences and Engineering, Xi'an Shiyou University, Xi'an
[4] PetroChina Tuha Oilfield Company, Hami
来源：
Dizhi Xuebao/Acta Geologica Sinica | 2022年 / 96卷 / 03期
关键词：
Accumulation conditions; Lucaogou Formation; Santanghubasin; Shale oil; Tiaohu-Malang sag;
D O I：
10.19762/j.cnki.dizhixuebao.2021140
中图分类号：
学科分类号：
摘要：
A set of mixed sediments of volcanic ash and carbonate are widespread in the second Member of the Permian Lucaogou Formation (P2l2) in the Tiaohu-Malang sag, Santanghu basin. However, the conditions and main controlling factors of shale oil in the P2l2 remain unclear. So, organic/inorganic geochemical analysis, core conventional analysis (porosity, permeability, and oil saturation), X-ray diffraction (XRD), thin sections, Ar-ion milled field emission scanning electron microscopy (FESEM), high pressure mercury injection (HPMI)-nuclear magnetic resonance (NMR), and other methods were used in this study. The results showed that: ① The P2l2 developed a set of low-mature and mature source rocks, which were dominated by tuff, with large thickness and high abundance of type Ⅰ kerogen, and an average TOC value of 5%. ② The P2l2 reservoir was characterized by complex lithology and poor physical properties, with porosity ranging from 1.1% to 9.5% and the permeability less than 0.1×10-3μm2. Nanometer scale intergranular pores, intercrystalline pores, and dissolution pores were the main reservoir pore types. Tuff and dolomite have the best pore structure, higher oil saturation, and stronger fluid mobility, followed by tuffaceous dolomite and dolomitic tuff. ③ Advantage lithofacies, favorable source and reservoir combination, and good fault-fracture system control the P2l2 shale oil accumulation, which has the characteristics of "source and reservoir integration, dominant facies belt control the reservoir, as well as fracture and dissolution control the sweet pot". © 2022, Science Press. All right reserved.
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页码：1053 / 1068
页数：15
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