Geological characteristics of shale rock system and shale oil exploration breakthrough in a lacustrine basin: A case study from the Paleogene 1st sub-member of Kong 2 Member in Cangdong sag, Bohai Bay Basin, China

Abstract: A deep understanding of the basic geologic characteristics of the fine-grained shale layers in the Paleogene 1st sub-member of Kong 2 Member (Ek21) in Cangdong sag, Bohai Bay Basin, is achieved through observation of 140 m continuous cores and systematic analysis of over 1 000 core samples... Ausführliche Beschreibung

1. Person: Xianzheng ZHAO verfasserin
Weitere Personen: Lihong ZHOU verfasserin; Xiugang PU verfasserin; Fengming JIN verfasserin; Wenzhong HAN verfasserin; Dunqing XIAO verfasserin; Shiyue CHEN verfasserin; Zhannan SHI verfasserin; Wei ZHANG verfasserin; Fei YANG verfasserin
Quelle: In Petroleum Exploration and Development (01.06.2018)
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Veröffentlicht: 2018
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  Creative Commons License Source: Directory of Open Access Journals (DOAJ).
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245 1 0 |a Geological characteristics of shale rock system and shale oil exploration breakthrough in a lacustrine basin: A case study from the Paleogene 1st sub-member of Kong 2 Member in Cangdong sag, Bohai Bay Basin, China  |h Elektronische Ressource 
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520 |a Abstract: A deep understanding of the basic geologic characteristics of the fine-grained shale layers in the Paleogene 1st sub-member of Kong 2 Member (Ek21) in Cangdong sag, Bohai Bay Basin, is achieved through observation of 140 m continuous cores and systematic analysis of over 1 000 core samples from two wells. Basic geological conditions for shale oil accumulation are proposed based on the unconventional geological theory of oil and gas. The shale rock system mainly developed interbedded formation of felsic shale, calcareous and dolomitic shale and carbonates; high quality hydrocarbon source rock formed in the stable and closed environment is the material base for shale oil enrichment; intergranular pores in analcite, intercrystalline pores in dolomite and interlayer micro-fractures make tight carbonate, calcareous and dolomitic shale and felsic shale effective reservoirs, with brittle mineral content of more than 70%; high abundance laminated shale rock in the lower section of Ek21 is rich in shale oil, with a total thickness of 70 m, burial depth between 2 800 to 4 200 m, an average oil saturation of 50%, a sweet spot area of 260 km2 and predicted resources of over 5×108 t. Therefore, this area is a key replacement domain for oil exploration in the Kongdian Formation of the Cangdong sag. At present, the KN9 vertical well has a daily oil production of 29.6 t after fracturing with a 2 mm choke. A breakthrough of continental shale oil exploration in a lacustrine basin is expected to be achieved by volume fracturing in horizontal wells. Key words: shale oil, fine grained deposits, horizontal well, volume fracturing, shale reservoir sweet spot, Paleogene Kongdian Formation, Cangdong sag, Bohai Bay Basin 
700 0 |a Lihong ZHOU  |e verfasserin  |4 aut 
700 0 |a Xiugang PU  |e verfasserin  |4 aut 
700 0 |a Fengming JIN  |e verfasserin  |4 aut 
700 0 |a Wenzhong HAN  |e verfasserin  |4 aut 
700 0 |a Dunqing XIAO  |e verfasserin  |4 aut 
700 0 |a Shiyue CHEN  |e verfasserin  |4 aut 
700 0 |a Zhannan SHI  |e verfasserin  |4 aut 
700 0 |a Wei ZHANG  |e verfasserin  |4 aut 
700 0 |a Fei YANG  |e verfasserin  |4 aut 
773 0 8 |i In  |t Petroleum Exploration and Development  |g  (01.06.2018)  |w (DE-601)DOAJ039859800  |x 2096-4803 
856 4 0 |u http://dx.doi.org/10.1016/S1876-3804(18)30043-0 
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856 4 0 |u http://www.sciencedirect.com/science/article/pii/S1876380418300430 
856 4 0 |u https://doaj.org/toc/1876-3804 
912 |a GBV_DOAJ 
951 |a AR 
952 |j 2018  |b 01  |c 06 

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