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Frontiers of Earth Science

ISSN 2095-0195

ISSN 2095-0209(Online)

CN 11-5982/P

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Front Earth Sci    0, Vol. Issue () : 55-64    https://doi.org/10.1007/s11707-012-0344-9
RESEARCH ARTICLE
Unconformity structures controlling stratigraphic reservoirs in the north-west margin of Junggar basin, North-west China
Kongyou WU1(), Douglas PATON2, Ming ZHA1
1. School of Geoscience, China University of Petroleum, Qingdao 266555, China; 2. School of Earth and Environment, University of Leeds, Leeds, LS2 9JT, UK
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Abstract

Tectonic movements formed several unconformities in the north-west margin of the Junggar basin. Based on data of outcrop, core, and samples, the unconformity is a structural body whose formation associates with weathering, leaching, and onlap. At the same time, the structural body may be divided into three layers, including upper layer, mid layer, and lower layer. The upper layer with good primary porosity serves as the hydrocarbon migration system, and also accumulates the hydrocarbon. The mid layer with compactness and ductility can play a role as cap rock, the strength of which increases with depth. The lower layer with good secondary porosity due to weathering and leaching can form the stratigraphic truncation traps. A typical stratigraphic reservoir lying in the unconformity between the Jurassic and Triassic in the north-west margin of the Junggar basin was meticulously analyzed in order to reveal the key controlling factors. The results showed that the hydrocarbon distribution in the stratigraphic onlap reservoirs was controlled by the onlap line, the hydrocarbon distribution in the stratigraphic truncation reservoirs was confined by the truncation line, and the mid layer acted as the key sealing rock. So a conclusion was drawn that “two lines (onlap line and truncation line) and a body(unconformity structural body)” control the formation and distribution of stratigraphic reservoirs.
Keywords unconformity structural body      stratigraphic reservoir      key controlling factors      Jurassic bottom      north-west margin of the Junggar basin     
Corresponding Author(s): WU Kongyou,Email:wukongyou@163.com   
Issue Date: 05 March 2013
 Cite this article:   
Kongyou WU,Douglas PATON,Ming ZHA. Unconformity structures controlling stratigraphic reservoirs in the north-west margin of Junggar basin, North-west China[J]. Front Earth Sci, 0, (): 55-64.
 URL:  
https://academic.hep.com.cn/fesci/EN/10.1007/s11707-012-0344-9
https://academic.hep.com.cn/fesci/EN/Y0/V/I/55
Fig.1  Location of the north-west margin in the Junggar basin. The faults and reservoirs are located at the Jurassic bottom
Fig.2  Tectonic movements and unconformities in the Junggar basin(According to ; ; He et al., 2010; )
Fig.3  Division and correlation about the vertical structures of unconformity
WellsMid layer/mUpper layer/mWellsMid layer/mUpper layer/mWellsMid layer/mUpper layer/m
415515G56216X5366
435620G43412X1544
45249H11820X6400
455720JQ926X6502
456318JQ23134X751110
470326JQ4148X86412
534330K77320X8843
B54920K89618X81821
B73910K80716X82633
BZ121425KQ398X1075
B63922K82623X1386
BZ2023M783X6355
BZ12518M11102X976
B6488M3104X306
B62232M1063X3146
F20320M284X383.512
FG7716W10620X4366
F20410W22426Z3914
G37518W968Z18715
G5549X8044Z30716
G67520X4849Z29717
G25624X6546Z3844
G13278X84213X25710
G66523X85514
Tab.1  Thickness of unconformity structures in the north-west margin of the Junggar basin
Fig.4  Genetic model of the upper layer of the unconformity structural body
Fig.5  Breakthrough pressure trends with depth of the weathered clay layer in the north-west margin of the Junggar basin
Fig.6  Dissolution of lower layer of unconformity structural body in the north-west margin of the Junggar basin (i-Z30, 107-112m, oily core. ii-X65, 1472m, dissolved core. iii-X64,1478m,Intergranular dissolved pores, orthogonal light. iv-X65,1490m,Intergranular dissolved pores, orthogonal light. v-X64, 1481m,Intragranular dissolved pores, Feldspar, orthogonal light. vi-X65,1523m, Intragranular dissolved pores, Quartz, orthogonal light)
Fig.7  Statistical porosity of the lower layer of the Jurassic bottom unconformity in the north-west margin of the Junggar basin, under microscope
Fig.8  Analytical charts of stratigraphic reservoirs in Xiazijie area (1-Jurassic Badaowan Formation. 2-Triassic Baijiantan Formation. 3-Triassic Karamay Formation. 4-Triassic Baikouquan Formati- on. 5-Structural contours of Jurassic bottom. 6-Onlap pinchout line of Jurassic conglomerate. 7-Erosive pinchout line of Triassic Baijiantan Formation. 8-Location of the section line. 9-Possible oil-bearing layer. 10-Oil-bearing layer. 11-Conglomerate stone. 12-Sand stone. 13-Mud stone)
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