Discussion on prospecting potential of shale oil in the 3<sup>rd</sup>sub-member of the Triassic Chang 7 member in Binchang block,southwestern Ordos Basin

Li Zhiming; Tao Guoliang; Li Maowen; Qian Menhui; Xie Xiaomin; Jiang Qigui; Liu Peng; Bao Yunjie; Xia Dongling

doi:10.11743/ogg20190311

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Discussion on prospecting potential of shale oil in the 3^rdsub-member of the Triassic Chang 7 member in Binchang block,southwestern Ordos Basin
Vol. 40, Issue 3, Pages: 558-570(2019)
Online First：28 June 2019，

Published：2019
DOI： 10.11743/ogg20190311
稿件说明：

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DOI：

Li Zhiming, Tao Guoliang, Li Maowen, et al. Discussion on prospecting potential of shale oil in the 3^rdsub-member of the Triassic Chang 7 member in Binchang block,southwestern Ordos Basin[J]. 2019, 40(3): 558-570. DOI: 10.11743/ogg20190311. DOI：

摘要

为探讨鄂尔多斯盆地西南部彬长区块三叠系延长组7段3亚段（简称长7

亚段）页岩油勘探前景，在对B-1井取心段岩心系统观察描述基础上，结合白光和荧光岩心图像扫描等资料，依据典型样品的热解、多温阶热释（解）和有机岩石学分析结果，系统评价了长7

亚段典型岩性的含油性及其赋存形式。研究结果表明：长7

亚段取心段主体是一套优质烃源层系，处于主生油窗早期阶段，黑色纹层状页岩、层状泥岩含油性好但以束缚油为主，油饱和指数OSI平均为45 mg/g （n=116），含油级别主要属中含油，不具页岩油潜力；灰褐色纹层状、薄层状及块状凝灰岩、凝灰质（泥质）粉砂岩夹层含油性好，并以游离油为主，有运移油贡献，主要赋存于微裂缝与碎屑矿物的粒间孔和粒缘缝中，油饱和指数OSI平均为200 mg/g （n=28），具有页岩油潜力。彬长区块伊陕斜坡范围区长7

亚段褐灰色凝灰岩、凝灰质（泥质）粉砂岩夹层是页岩勘探的有利层段，具有一定页岩油勘探前景。

Abstract

To discuss the prospecting potential of shale oil in the 3

sub-member of the Triassic Chang 7 member(Chang 7

) in Binchang block

southwestern Ordos Basin

the oil content and oil occurrence of typical rock types in Well B-1 were systematically observed and evaluated based on systematic observation and description of cores and using the results of Rock-Eval pyrolysis

thermovaporization in different temperature ranges and organic petrological analysis in combination with scanned images of cores with white light and fluorescence.The results show that the cored interval in Chang 7

from Well B-1 is quality source rock at early stage of major oil window.The black laminated shale and layered mudstone are characterized by high oil content but dominance of immobile oil

and the average OSI is 45 mg/g(n=116)

indicating no prospecting potential for shale oil.Whereas

the gray-brown laminated

thin-bedded and massive tuff and the interbedded tuffaceous(argillaceous) siltstone are characterized by high oil content

predominance of free oil and contributions from migrated oil.The oil mainly occurs in microfractures

intergranular pores and grain boundary fractures of detrital minerals

and its average OSI is 200 mg/g(n=28)

indicating good prospecting potential for shale oil.In conclusion

the gray-brown tuff and the interbedded tuffaceous(argillaceous) siltstone on the Yishan slope in Binchang block are favorable intervals for shale oil exploration and have some shale oil prospecting potential.