Lithologic Reservoirs ›› 2026, Vol. 38 ›› Issue (4): 115-125.doi: 10.12108/yxyqc.20260410

• PETROLEUM EXPLORATION • Previous Articles     Next Articles

Oil and gas charging episodes and reservoir formation models of Ordovician Lianglitage Formation carbonate rocks in Tazhong area

SUN Yangzhen1(), YANG Peng1(), JIA Kun1, QIN Shuxin2, LIU Keyu1   

  1. 1 State Key Laboratory of Deep Oil and Gas， China University of Petroleum （East China）， Qingdao 266580, Shandong， China
    2 No.3 Oil Production Plant， PetroChina Changqing Oilfield Company， Yinchuan 750006， Ningxia， China
  • Received:2025-11-12 Revised:2026-01-04 Online:2026-07-01 Published:2026-07-06
  • Contact: YANG Peng E-mail:18953029481@163.com;yangpeng@upc.edu.cn

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Abstract:

Based on in-situ calcite U-Pb dating, fluid inclusion analysis, and basin modelling, the petrological and fluid activity characteristics of Ordovician Lianglitage Formation in Tazhong area were delineated. The oil and gas charging episodes were systematically analyzed, and reservoir formation models were characterized. Research results show that: （1） Main rock types of Ordovician Lianglitage Formation reservoir in Tazhong area are granular limestone and biogenic limestone, and storage space types include pores, karst caves, and fractures. （2） Two phases of calcite cements develop in the reservoir, with the first phase of calcite cement emitting bright red catho-doluminescence light, and the corresponding U-Pb age of 427.0 ± 4.2 Ma, and the second phase of calcite cement displaying orange-yellow cathodoluminescence light, and the corresponding U-Pb age of 369.0 ± 14.0 Ma. (3) Two types of oil inclusion assemblages (OIA) have been identified. Type I OIA emits yellow and pale yellow fluorescence, corresponding to the oil charge timing of 425.0-410.0 Ma. Type Ⅱ OIA emits blue fluorescence, corresponding to the oil charge timing of 325.0-320.0 Ma. (4) Lianglitage Formation reservoir in the study area has mainly experienced two episodes of oil charging and one episode of natural gas charging. The first episode of oil charging occurred in the late Caledonian period, the second episode of oil charging occurred in the middle Hercynian period, and the natural gas charging occurred in the late Himalayan period. The formation of this oil and gas reservoir is the result of synergistic effects of multiple factors, including high-quality reservoirs, multi-stage hydrocarbon supply, efficient transportation, effective sealing, and favorable structural backgrounds.

Key words: oil and gas charging episodes, carbonate rock, fluid inclusion PVT modelling, U-Pb dating, Liang-litage Formation, Ordovician, Tazhong area

CLC Number: 

  • TE122.1

Fig. 1

Structural location of Tazhong area （a） and comprehensive stratigraphic column （b）， Tarim Basin"

Fig. 2

Microscopic characteristics of Ordovician carbonate reservoirs in Tazhong area"

Fig. 3

Microphotos of calcite veins of carbonate rocks from Ordovician Lianglitage Formation, Tazhong area"

Fig. 4

U-Pb isotope age of calcite cement in carbonate rocks from Ordovician Lianglitage Formation in well TZ243, Tazhong area"

Fig. 5

Microphotos of oil inclusions in calcite veins from Ordovician Lianglitage Formation, Tazhong area"

Fig. 6

Fluorescence spectra （a） and spectral parameter characteristics （b） of oil inclusions from Ordovician Lianglitage Formation, Tazhong area"

Fig. 7

Gas filling degree features of two types of oil inclusions from Ordovician Lianglitage Formation, Tazhong area"

Fig. 8

Laser Raman spectral characteristics of aqueous inclusions coexited with oil inclusions of Ordovician Lianglitage Formation, Tazhong area"

Fig. 9

Microthermometric features of fluid inclusions of Ordovician Lianglitage Formation, Tazhong area"

Table 1

Microthermometric data of fluid inclusions of Ordovician Lianglitage Formation, Tazhong area"

井号 类型 油包裹体Th/℃ 伴生盐水
包裹体Th/℃		 伴生盐水
包裹体Tm/℃		 盐度/%
TZ243 Ⅰ类 68.8~90.1 76.8~100.2 -2.0~-3.9 3.4~6.3
Ⅱ类 88.0~110.0 96.5~120.0 -7.8~8.3 11.4~12.1
TZ242 Ⅱ类 78.8~105.0 88.1~110.0 -8.0~9.8 11.6~13.7
TZ825 Ⅰ类 69.0~90.1 78.1~100.0 -2.0~-4.0 3.4~6.4

Fig. 10

Burial and thermal history，correction relationship between formation temperature and vitrinite reflectance of typical wells in Ordovician Lianglitage Formation, Tazhong area"

Fig. 11

PVT modelling results of two types of oil inclusions and coexited aqueous inclusions of Ordovician Lianglitage Formation, Tazhong area"

Fig. 12

Comprehensive diagram of oil and gas systems of Ordovician Lianglitage Formation, Tazhong area"

Fig. 13

Multiple phases of oil and gas charging patterns of Ordovician Lianglitage Formation in Tazhong area"

Fig. 14

Oil and gas accumulation models of Ordovician Lianglitage Formation, Tazhong area"

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