Micro fractures and pores in lacustrine shales of the Upper Triassic Yanchang Chang7 Member, Ordos Basin, China
Micro fractures and pores in lacustrine shales of the Upper Triassic Yanchang Chang7 Member, Ordos Basin, China
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鄂尔多斯盆地上三叠统延长长7段湖相页岩微裂缝与孔隙
DOI：
10.1016/j.petrol.2017.03.044
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发表时间：
2017-07
影响因子：
--
通讯作者：
Ping’an Peng
中科院分区：
文献类型：
--
作者：
Wenzheng Zhang;Liqin Xie;Weiwei Yang;Yan Qin;Ping’an Peng
继北美页岩油勘探成功后，中国最近开始勘探非常规石油资源。工业页岩油流是从湖相盆地的一些地层中获得的，特别是在鄂尔多斯盆地的长7段，其可达到每天150桶（例如，耿295井，2655米）。因此，现在提出的最重要的问题之一集中在油藏间隔内的页岩油储存上。本文对鄂尔多斯盆地延长组长7段五个富有机质页岩样品进行了场发射扫描电镜分析，并对页岩中的孔隙和裂缝进行了表征。结果表明，微裂缝是长7段页岩油的主要储集空间。识别出三种类型的裂缝和孔隙：（1）与间隙有机质和有机质纹层有关的裂缝和孔隙; (ii)在矿物如黄铁矿、云母和长石中出现的裂缝和孔隙，以及（iii）沿沿着有机物质和矿物的接触界面存在的裂缝和孔隙。这些裂缝和孔隙主要是由生油、构造应力或溶解作用形成的。总有机碳和脆性矿物是控制孔隙和裂缝丰度的主要因素。高有机碳含量和脆性矿物有利于页岩孔隙和裂缝的形成和保存。这些结果对鄂尔多斯盆地页岩油气勘探具有重要的指导意义，并对我国其它湖盆页岩油气勘探具有一定的借鉴作用。
Following the successful exploration of shale oil in North America, China recently started to explore.unconventional oil resources. Industrial shale oil flows were obtained from some strata in lacustrine basins,.especially in the Chang7 Member of the Ordos Basin that may reach 150 barrels a day (e.g., in well Geng 295,.2655 m). So one of the most significant questions now being asked focuses on the shale oil storage within the.reservoir interval. In the present study, five organic rich shale samples were collected from the Chang 7 Member.of the Yanchang Formation in the Ordos Basin and were analyzed by field emission scanning electron.microscopy to characterize pores and fractures in the shales. The results show that microfractures are.predominant storage space for shale oil produced from the Chang 7 Member. Three types of fractures and pores.were recognized, including (i) fractures and pores associated with interstitial organic matter and organic lamina,.(ii) fractures and pores occurring in minerals such as pyrite framboid, mica, and feldspar, and (iii) fractures and.pores that are present along the contact interface of organic matter and minerals. These fractures and pores.were mainly formed by oil generation, tectonic stress, or dissolution. The total organic carbon and brittle.minerals are main factors controlling the abundance of pores and fractures. High total organic carbon and.brittle minerals are favorable for the formation and preservation of pores and fractures in shale. These results.may provide an insight that helps to locate sweet spots for shale oil exploration in Ordos Basin and affect oil.exploration in shales in other lacustrine basins of China.
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DOI：
10.2118/138446-ms
发表时间：
2010
期刊：
--
影响因子：
--
作者：
J. Mullen;J. C. Lowry;K. C. Nwabuoku
通讯作者：
J. Mullen;J. C. Lowry;K. C. Nwabuoku
DOI：
--
发表时间：
2005
期刊：
--
影响因子：
--
作者：
Zhang Wenzheng
通讯作者：
Zhang Wenzheng
影响因子：
6.1
作者：
P. Wróbel;Sławomir Bała;M. Czyzycki;Magdalena Golasik;T. Librowski;B. Ostachowicz;W. Piekoszewski;A. Surowka;M. Lankosz
通讯作者：
P. Wróbel;Sławomir Bała;M. Czyzycki;Magdalena Golasik;T. Librowski;B. Ostachowicz;W. Piekoszewski;A. Surowka;M. Lankosz
影响因子：
3.5
作者：
Ø. Marcussen;B. Thyberg;C. Peltonen;J. Jahren;K. Bjørlykke;J. Faleide
通讯作者：
Ø. Marcussen;B. Thyberg;C. Peltonen;J. Jahren;K. Bjørlykke;J. Faleide
影响因子：
7.5
作者：
Ma Jun
通讯作者：
Ma Jun