ANALYSIS ON THE FORMATION AND ENRICHMENT CONTROL MECHANISM OF THE LOWER JURASSIC RESERVOIRS BY PALEO-GEOMORPHOLOGY OF WUQI AREA IN THE ORDOS BASIN

JIANG Daiqin; WEN Zhigang; TANG Renwen; HE Tongtong

doi:10.12090/j.issn.1006-6616.2018.24.05.063

Volume 24 Issue 5

Oct. 2018

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JIANG Daiqin, WEN Zhigang, TANG Renwen, et al., 2018. ANALYSIS ON THE FORMATION AND ENRICHMENT CONTROL MECHANISM OF THE LOWER JURASSIC RESERVOIRS BY PALEO-GEOMORPHOLOGY OF WUQI AREA IN THE ORDOS BASIN. Journal of Geomechanics, 24 (5): 627-634. DOI: 10.12090/j.issn.1006-6616.2018.24.05.063

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ANALYSIS ON THE FORMATION AND ENRICHMENT CONTROL MECHANISM OF THE LOWER JURASSIC RESERVOIRS BY PALEO-GEOMORPHOLOGY OF WUQI AREA IN THE ORDOS BASIN

doi: 10.12090/j.issn.1006-6616.2018.24.05.063

JIANG Daiqin^{1, 2
,},
WEN Zhigang^{1, 2
,
,},
TANG Renwen³,
HE Tongtong³

1.
Key Laboratory of Oil and Gas Resources and Exploration Technology, Ministry of Education, Yangtze University, Wuhan 430100, Hubei, China
2.
College of Resources and Environment, Yangtze University, Wuhan 430100, Hubei, China
3.
The ninth Oil Production Plant of Changqing Oilfield Company, Yinchuan 750000, Ningxia, China

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Received: 2018-07-22
Revised: 2018-09-21
Published: 2018-10-01

Abstract

Abstract

In order to study the main controlling factors of the accumulation of Jurassic paleogeomorphic reservoir in Wuqi area, sedimentological paleogeomorphic restoration method was mainly used to describe the distribution of Jurassic paleodrainage system in Wuqi area according to the sand body thickness of the Fuxian Formation + Yan 10 Formation. Combined with the pre-Jurassic paleogeological characteristics of the Ordos Basin, the paleogeomorphic characteristics of the Wuqi area and the accumulation and enrichment of lower Jurassic were studied, and the hydrocarbon accumulation model was summarized. The results shows that there are three ancient terrains in Wuqi area:incised valley, slope zone and mound. The pre-Jurassic paleotopography controls the deposition of the early Jurassic strata and the distribution of oil reservoirs. The main channels for oil migration are the angle unconformity and the erosion between the Fuxian Formation and the Yanchang Formation and the thick high-permeable sand bodies in valley. At the same time, the high-permeable sand bodies also the main reservoirs of the lower Jurassic oil reservoirs. According to the spatial distribution of the lower Jurassic reservoirs, combined with various factors such as paleogeomorphology, sedimentary environment and micro-structural characteristics, three types of hydrocarbon accumulation models of Jurassic paleogeomorphology reservoirs in Wuqi area are summarized:slope model, mound model and paleo-valley model, of which mound model reservoirs are the most developed.
- accumulation model,
- paleogeomorphic features,
- Jurassic,
- the Ordos Basin

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ANALYSIS ON THE FORMATION AND ENRICHMENT CONTROL MECHANISM OF THE LOWER JURASSIC RESERVOIRS BY PALEO-GEOMORPHOLOGY OF WUQI AREA IN THE ORDOS BASIN

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ANALYSIS ON THE FORMATION AND ENRICHMENT CONTROL MECHANISM OF THE LOWER JURASSIC RESERVOIRS BY PALEO-GEOMORPHOLOGY OF WUQI AREA IN THE ORDOS BASIN

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