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Natural Gas Geoscience ›› 2021, Vol. 32 ›› Issue (4): 551-561.doi: 10.11764/j.issn.1672-1926.2020.11.012

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Petroleum geological characteristics and exploration potential in slope area of Well Pen⁃1 Western Depression in Junggar Basin

Hai-tao QIAN1(),Dong-xu SU1,Imin ABLIMIT1,Xue-yong WANG1,Zong-hao LI1,Guo-dong WANG2   

  1. 1.Research Institute of Exploration and Development，Xinjiang Oilfield Company，PetroChina，Karamay 834000，China
    2.Northwest Branch，Research Institute of Petroleum Exploration and Development，PetroChina，Lanzhou 730020，China
  • Received:2020-08-26 Revised:2020-10-20 Online:2021-04-10 Published:2021-04-09
  • Supported by:
    The Major Science and Technology Project of CNPC(2017E-0401);the China National Science & Technology Major Project(2017ZX05001-004)

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Abstract:

The Permian and Triassic systems in slope area of Well Pen-1 Western Depression have a good source-reservoir-cap assemblage， which is an important area for the exploration of primary oil and gas reservoirs. The preliminary exploration is mainly based on the middle and shallow strata and mainly focuses on the search for secondary efficient oil and gas reservoirs. It is considered that the Permian and Triassic strata have not been used as the main exploration strata due to the large burial depth and undeveloped reservoirs. In recent years， the discovery of Mahu large oil area has provided important enlightenment for basin fan body exploration. Based on the exploration experience of Mahu， this paper makes a systematic study of the conditions of Permian and Triassic hydrocarbon accumulation in this area， and further deepens the geological understanding and enhances the resources and exploration potential through the overall evaluation of fan body， reservoir， unconformity surface and fault system. Studies have shown that there are two sets of high-quality source rocks of the Permian Fengcheng Formation and the lower Wuerhe Formation in the Well Pen-1 Western Depression. Permian and Triassic large-scale effective conglomerate reservoirs are developed. The complex oil and gas transmission system is composed of faults， unconformities and sand bodies. Regional and local mudstone capping， plain dense occlusion zone and faults constitute multiple capping preservation conditions， which laid a formation of large oil and gas fields. Three hydrocarbon accumulation models are established， namely， lower source and upper reservoir of the upper source-， new source to old reservoir of side source， self-generation and self-accumulation in source， and the hydrocarbon enrichment law under different models is proposed. Permian and Triassic of the Well Pen-1 Western Depression are favorable areas for hydrocarbon migration and accumulation. Multi-layered series are vertically stacked，high-quality reservoirs are connected in plane，and multiple collection types. It has great resource potential and low exploration degree. The upper and lower Wuerhe Formation of Permian and Baikouquan Formation of Triassic are selected as the breakthrough points for oil and gas exploration to achieve a comprehensive breakthrough of Permian in the central depression of Junggar Basin.

Key words: Scale reservoir, Hydrocarbon accumulation mode, Exploration potential, Well Pen-1 Western Depression, Junggar Basin

CLC Number: 

  • TE122.2

Fig.1

Structure map(a) and comprehensive stratigraphic histogram(b) in the Well Pen-1 Western Depression of Junggar Basin"

Table 1

The geochemical characteristics of the main source rocks in the Well Pen-1 Western Depression of Junggar Basin"

层位TOC/%RO/%(S1+S2)/(mg/g)氯仿沥青“A”/%氢指数/(mg/g)干酪根类型
C（0.03~19.8）/1.630.54~1.21（0.02~19.97）/0.84（0.001~0.351 5）/0.031（1.63~365.06）/52.45Ⅲ型
P1j（0.1~14.04）/2.381.38~1.9（0.01~17.60）/1.81（0.002 5~0.453 9）/0.052（1.64~507.89）/55.85Ⅲ型
P1f（0.03~4.43）/0.930.85~1.16（0.01~59.84）/4.66（0.000 4~1.893 3）/0.250 7（3.33~1 872.37）/306.54Ⅱ型
P2w（0.18~14.03）/1.690.5~1.7（0.01~37.52）/2.06（0.000 7~0.802 4）/0.069 2（1.20~950.00）/74.16Ⅲ型

Fig.2

Physical property and property-depth relationship in the Well Pen-1 Western Depression and its periphery of Junggar Basin"

Fig.3

Profile showing the interpretation result of seismic and geology across Wells MB2-QS2-QS1-PT1-XY1（see profile position in Fig.1）"

Fig.4

Play classification of composite petroleum system in the Well Pen-1 Western Depression of Junggar Basin"

Fig.5

Hydrocarbon accumulation models in the Well Pen-1 Western Depression of Junggar Basin（see profile position in Fig.1）"

Fig.6

Sedimentary facies of the Upper and Lower Wuerhe formation of Permian and Baikouquan Formation of Triassic in the Well Pen-1 Western Depression of Junggar Basin"

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