Laminae combination and shale oil enrichment patterns of Chang 73 sub-member organic-rich shales in the Triassic Yanchang Formation, Ordos Basin, NW China

被引:0
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作者
XI Kelai [1 ]
LI Ke [1 ]
CAO Yingchang [1 ,2 ]
LIN Miruo [3 ]
NIU Xiaobing [4 ]
ZHU Rukai [5 ]
WEI Xinzhuo [1 ]
YOU Yuan [4 ]
LIANG Xiaowei [4 ]
FENG Shengbin [4 ]
机构
[1] Key Laboratory of Deep Oil and Gas, China University of Petroleum(East China)
[2] Laboratory for Marine Mineral Resources, Qingdao National Laboratory for Marine Science and Technology
[3] Key Laboratory of Deep Oil and Gas, China University of Petroleum
[4] PetroChina Changqing Oilfield Company
[5] Pertro China Research Institute of Petroleum Exploration & Development
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中图分类号
P618.13 [石油、天然气];
学科分类号
0709 ; 081803 ;
摘要
The Chang 7sub-member of Triassic Yanchang Formation in the Ordos Basin was taken as an example and the lamina types and combinations, reservoir space features and shale oil enrichment patterns in organic-rich shale strata were investigated using core observation, thin section analysis, XRF element measurement, XRD analysis, SEM, high solution laser Raman spectroscopy analysis, and micro-FTIR spectroscopy analysis, etc. According to the mineral composition and thickness of the laminae, the Chang 7organic-rich shales have four major types of laminae, tuff-rich lamina, organic-rich lamina, silt-grade feldspar-quartz lamina and clay lamina. They have two kinds of shale oil-bearing layers, "organic-rich lamina + silt-grade feldspar-quartz lamina" and "organic-rich lamina + tuff-rich lamina" layers. In the "organic-rich + silt-grade feldspar-quartz" laminae combination shale strata, oil was characterized by relative high maturation, and always filled in K-feldspar dissolution pores in the silt-grade feldspar-quartz laminae, forming oil generation, migration and accumulation process between laminae inside the organic shales. In the "organic-rich + tuff-rich lamina" binary laminae combination shale strata, however, the reservoir properties were poor in organic-rich shales, the oil maturation was relatively lower, and mainly accumulated in the intergranular pores of interbedded thin-layered sandstones. The oil generation, migration and accumulation mainly occurred between organic-rich shales and interbedded thin-layered sandstones.
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页码:1342 / 1353
页数:12
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