Lithologic Reservoirs ›› 2026, Vol. 38 ›› Issue (3): 1-11.doi: 10.12108/yxyqc.20260301

• PETROLEUM EXPLORATION • Previous Articles     Next Articles

Development characteristics and hydrocarbon exploration potential of Ordovician dome structures in northern Tarim Basin

YUN Lu1(), CAO Zicheng1, LI Haiying1, GENG Feng2, LIU Yongli2(), WEI Huadong2, HUANG Cheng2, ZHANG Di2   

  1. 1 Northwest Oilfield Company， Sinopec， Urumqi 830011， China
    2 Research Institute of Exploration and Development， Northwest Oilfield Company， Sinopec， Urumqi 830011， China
  • Received:2025-09-20 Revised:2025-11-04 Online:2026-05-01 Published:2025-12-29

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Abstract:

Ordovician carbonate strata of Shunbei-Tahe area of Tarim Basin widely develop dome structures， several wells have obtained high-yield industrial oil and gas flows， which shows good resource potential. Based on data of high-precision 3D seismic， well logging， and core testing analysis， taking 150 dome structures from the periphery of well H1 and the southeastern slope zone of Akekule uplift in Shunbei area as examples， the geometric characteristics， genesis mechanisms， and reservoir features of dome structures were systematically analyzed. The results show that：（1） Ordovician dome structures in northern Tarim Basin are concentric-ring-shaped in plan view， which can be classified into four types：R-type， T-type， contraction-type， and composite-type. In cross-section， they exhibit a torch-like shape of “narrow at the bottom and wide at the top”. （2） The main body of dome structures formed during Middle Caledonian episode Ⅰ-Ⅱ， as a result of the combined effects of regional shear stress field and lithological differences, and is a genesis mechanism of “shear stress induction-interlayer slip-local uplift”. （3） The dome structure reservoir is a “fracture-cavity and pore-cavity” composite reservoir system， cha-racterized by the advantages of “faults connecting to the source， vertical migration and accumulation, surrounding rock sealing， and independent hydrocarbon accumulation”， with large resource scale. It is a significant new frontier for deep to ultra deep petroleum exploration.

Key words: dome structure, carbonate rock, shear stress, source-connecting fault, multi-layered 3D hydrocarbon accumulation, Ordovician, Shunbei-Tahe area, Tarim Basin

CLC Number: 

  • TE122

Fig. 1

Distribution of dome structures in Middle Caledonian fault system （a）， comprehensive stratigraphic column of Ordovician-Cambrian （b）， northern Tarim Basin"

Fig. 2

Distribution of coherence attribute superimposed dome structures of the bottom interface （T76） of Middle Ordovician in the southeast slope of Akekule uplift in northern Tarim Basin"

Fig. 3

Seismic cross-section of dome structures in the southeast slope zone of Akekule uplift in northern Tarim Basin"

Fig. 4

Relationship between uplift amplitude and aspect ratio of long and short axes of the top boundary （T74） of Yijianfang Formation of dome structures in the southeast slope zone of Akekule uplift in northern Tarim Basin"

Fig. 5

Relationship between uplift amplitude and dome area of the top boundary （T74） of Yijianfang Formation of dome structures in the southeast slope zone of Akekule uplift in northern Tarim Basin"

Fig. 6

Comprehensive stratigraphic column of well H1 （a）， FMI image of the interval 7 850-7 853 m in Lower Yingshan Formation （b）， FMI image of the interval 8 302-8 306 m in Penglaiba Formation （c）， Shunbei area， Tarim Basin"

Fig. 7

Core photos of Ordovician Penglaiba Formation in well H1 of Shunbei area， Tarim Basin"

Fig. 8

Formation thickness and flattened characteristics of dome structures in the southeast slope zone of Akekule uplift in northern Tarim Basin"

Fig. 9

Theoretical models of the genesis mechanism of dome structures in the southeast slope zone of Akekule uplift in northern Tarim Basin"

Fig. 10

Reservoir development models of dome structures in northern Tarim Basin"

Table 1

Drilling leakage and productivity of dome structures in Shunbei area， Tarim Basin"

井名 漏失失返位置 漏失量/m3 产能/（t·d-1）
H1 T76 界面之下 70 m
T78 界面之下 82 m		 293
40		 33
H2 T76 界面之下 88 m 2 749 50
H3 T76 界面附近 2 193 110
H4 溢流，T76 界面附近 1 45

Fig. 11

Seismic profiles of acoustic impedance inversion of Ordovician dome structures in the southeast slope zone of Akekule uplift in northern Tarim Basin"

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